JP2004140418A - Information recording medium, method for simultaneous recording, method for simultaneous reproduction, information recording apparatus, and information reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein many buffer memories are required in order to simultaneously record a plurality of real time data and reproduction of the recorded data by a different apparatus has been difficult. <P>SOLUTION: An information recording medium, a method for simultaneously recording and an information recording and reproduction apparatus ensuring simultaneous recording can be obtained by recording data in each of an area not smaller than a minimum size satisfying a simultaneous recording condition capable of accessing twice as many times as the number of real time data to be recorded and switching to another recording for performing recording when a buffer has become empty. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an information recording medium capable of simultaneously recording a plurality of real-time data, a simultaneous recording method, a simultaneous reproducing method, an information recording device, and an information reproducing device.
[0002]
[Prior art]
There is a hard disk as an information recording medium having a sector structure. In recent years, the capacity and multimedia have been increased, and applications from personal computers to consumer appliances have been advanced.
[0003]
Hereinafter, simultaneous recording on a conventional hard disk will be described with reference to the drawings. In a hard disk, the size of a recording area is fixed to a unit larger than a sector in advance, and access is performed in fixed block units.
[0004]
FIG. 2 shows a simultaneous recording model for simultaneously recording two real-time data. The simultaneous recording model includes a pickup 74 for recording and reproducing real-time data on an information recording medium, an encoder A (encoder 70) for encoding first real-time data, and an encoded first real-time data. Buffer A (recording buffer 72) for temporarily storing data before recording by the pickup 74, an encoder B (encoder 71) for encoding the second real-time data, and a second encoded real-time data. A recording buffer B (recording buffer 73) for temporarily storing data before recording by the pickup 74.
[0005]
FIG. 38 shows an example in which two real-time data are recorded on an information recording medium while ensuring continuity using the recording buffers A and B. In this example, while recording the first real-time data in the areas 83 and 85 on the information recording medium, the second real-time data is recorded in the areas 81 and 84 on the information recording medium.
[0006]
In FIG. 38, A81, A82, and A83 indicate operations (access operations) in which the pickup 74 moves between areas to be accessed. The time required for the access operations A81, A82, and A83 is the time required for the pickup 74 to access between the innermost area and the outermost area of the information recording medium (that is, the maximum time). It is assumed that the access time is Ta). It is assumed that the data transfer rate between the recording buffers A and B and the pickup 74 is constant Vt. It is assumed that the data transfer rate between the encoders A and B and the recording buffers A and B is constant Vd. When data to be recorded is compressed at a variable rate, Vd is the maximum value of the variable rate.
[0007]
In the recording operation W81, all data stored in the recording buffer A is recorded in the area 81. Thereafter, data is accumulated in the recording buffer A during the access operation A81, the recording operation W86, and the access operation A82. In the recording operation W82, all data stored in the recording buffer A is recorded in the area 84. Thereafter, data is accumulated in the recording buffer A during the access operation A83, the recording operation W87, and the next access operation (not shown).
[0008]
On the other hand, data is accumulated in the recording buffer B between the recording operation W81 and the access operation A81, and all the data accumulated in the recording buffer B is recorded in the area 83 in the recording operation W86. Thereafter, during the access operation A82, the recording operation W82, and the access operation A83, data is accumulated in the recording buffer B, and in the recording operation W87, all the data accumulated in the recording buffer B is recorded in the area 85.
[0009]
As described above, when the data transfer rate is constant, the data amount in the recording buffer A is balanced between the recording state and the non-recording state, and the data amount in the recording buffer B is also the recording state and the non-recording state. Balanced between. Also, the recording of the first real-time data (recording A) and the recording of the second real-time data (recording B) are performed alternately, so that the recording of two real-time data can be performed continuously. .
[0010]
The example shown in FIG. 38 is also a condition indicating the minimum size of the area in which data can be recorded and reproduced. That is, since it is not possible to specify where on the disc the recording / reproducing area exists, the access between the recording areas is considered by the maximum access time including the rotation wait.
[0011]
FIG. 39 is a diagram showing a change in the amount of data in the recording buffers A and B when data of a variable rate is recorded. At the end of the recording operation W91, the access operation A91, the recording operation W96, and the access operation A92, if data larger than the size of the recording area is not stored in the recording buffer A, or if the recording rate is low, the data to be recorded In such a case, rotation waiting occurs, and the recording time increases. In this case, an access operation A93 for accessing another recording area for real-time data is performed, and a recording operation W97 is performed. As described above, when data is recorded for each fixed-size block and access is performed in fixed block units, the size of the fixed block is set to two access times and the amount of data accumulated in the recording time of one recording area. Is the size of the buffer memory required for the recording buffer A. Conversely, the recording buffer B also requires a buffer memory of the same size as the recording buffer A.
[0012]
In the case of a hard disk, since the data transfer capability is high, the size of the fixed block can be reduced and the size of the buffer memory can be reduced.
[0013]
[Problems to be solved by the invention]
However, when applying the above-described simultaneous recording to an optical disc, there is a problem that a large buffer memory is required because the optical disc has a low data transfer rate and a long access time. Another problem is that it is necessary to perform simultaneous recording stably. Furthermore, it is necessary to edit a plurality of recorded real-time data and reproduce them at the same time.
[0014]
[Means for Solving the Problems]
The method of the present invention is a method for simultaneously recording a plurality of real-time data on an information recording medium according to a simultaneous recording model, wherein the simultaneous recording model comprises: a pickup P for accessing an area on the information recording medium; An encoding module EMi for encoding the data Di; and a recording buffer WBi for accumulating the encoded real-time data Di, wherein the method searches for an unallocated area in a volume space on the information recording medium. Allocating at least one unallocated area in the volume space as an area Ai for recording real-time data Di, and a recording operation Wi for recording real-time data Di stored in the recording buffer WBi in the area Ai. Performing a recording buffer while performing the recording operation Wi. It is determined whether or not WBi is empty. If it is determined that the recording buffer WBi is empty, the recording operation Wi is switched to the recording operation Wj (i ≠ j), and it is determined that the recording buffer WBi is not empty. In this case, the step of continuing the recording operation Wi is included, and each of the at least one area allocated as the area Ai includes the recording buffer WBi in at most one access operation and at most two recording operations. It is configured to satisfy the simultaneous recording condition that it can be made empty, where i is an arbitrary integer of 1 or more and n or less, and n indicates the number of a plurality of real-time data to be simultaneously recorded. It is any integer above.
[0015]
Each of the at least one area allocated as the area Ai has a size of Y or more, where Y = 2 × n × Ta × Vd × VtＶ (Vt−n × Vd), and Ta is Indicates the access time required for the pickup P to access between the innermost area and the outermost area of the information recording medium, and Vt indicates the data between the pickup P and the recording buffer WBi. Vd indicates the data transfer rate between the encoding module EMi and the recording buffer WBi for all i.
[0016]
Each of the at least one area allocated as the area Ai has a size equal to or larger than Yi, where Yi = (2 × n × Ta × Vt × Vdi) ÷ ｛Vt− (Vd1 + Vd2 +... + Vdn)｝, Ta indicates an access time required for the pickup P to access between the innermost area and the outermost area of the information recording medium, and Vt indicates the pickup P and the recording buffer. Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi.
[0017]
A first access time required for the pickup P to access the area Aj from the area Ai, and a time required for accessing the other one from the at least one area allocated as the area Ai. The method may further include estimating the second access time.
[0018]
Each of the at least one area allocated as the area Ai has a size equal to or larger than Y, where Y = {2 × (T1 +... + Tn) × Vt × Vd} (Vt−n × Vd), Ti indicates the first access time or the second access time, Vt indicates the data transfer rate between the pickup P and the recording buffer WBi, and Vd indicates the data transfer rate for all i. , The data transfer rate between the encoding module EMi and the recording buffer WBi.
[0019]
Each of the at least one area allocated as the area Ai has a size equal to or greater than Yi, where Yi = {2 × (T1 +... + Tn) × Vt × Vdi} Vt− ( Vd1 + Vd2 +... + Vdn)}, Ti indicates the first access time or the second access time, Vt indicates a data transfer rate between the pickup P and the recording buffer WBi, and Vdi indicates encoding. The data transfer rate between the module EMi and the recording buffer WBi is shown.
[0020]
The area Ai may be provided on the outer peripheral portion of the information recording medium for all i.
[0021]
The method of the present invention is a method for simultaneously recording a plurality of real-time data on an information recording medium according to a simultaneous recording model, wherein the simultaneous recording model comprises: a pickup P for accessing an area on the information recording medium; An encoding module EMi for encoding the data Di; and a recording buffer WBi for accumulating the encoded real-time data Di, wherein the method searches for an unallocated area of a volume space on the information recording medium. Allocating at least one unallocated area in the volume space as an area Ai for recording real-time data Di, and executing a recording operation Wi for recording the real-time data Di stored in the recording buffer WBi in the area Ai. And real time data D in the recording operation Wi. Is determined to have been recorded to one end of at least one area allocated as the area Ai, and if it is determined that the real-time data Di has been recorded to the end, the recording operation Wi is performed. Switching to the recording operation Wj (i ≠ j), and when it is determined that the real-time data Di has not been recorded to the end, continuing the recording operation Wi. Each of the at least one area stores the real-time data Di accumulated in the recording buffer WBi between n access operations and (n-1) recording operations accompanying the switching of the recording process in one recording operation. Where i is any integer from 1 to n, and n is the number of simultaneous recordings. Is any integer of 2 or greater indicating the number of the plurality of real-time data to be recorded.
[0022]
Each of the at least one region assigned as region Ai has a size of Yi, where Yi = (n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)}. , Ta indicates the access time required for the pickup P to access between the innermost area and the outermost area of the information recording medium, and Vt indicates the time between the pickup P and the recording buffer WBi. Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi.
[0023]
The method may further include a step of estimating an access time required for the pickup P to access the area Aj from the area Ai.
[0024]
Each of the at least one region allocated as region Ai has a size of Y, where Y = {(T1 +... + Tn) × Vt × Vd} (Vt−n × Vd) , Ti indicate the access time, Vt indicates the data transfer rate between the pickup P and the recording buffer WBi, and Vd indicates the data transfer rate between the encoding module EMi and the recording buffer WBi for all i. 3 shows the data transfer rate.
[0025]
Each of the at least one region assigned as region Ai has a size of Yi, where Yi = {(T1 +... + Tn) × Vt × Vdi} Vt− (Vd1 + Vd2 +. + Vdn)｝, Ti indicates the access time, Vt indicates a data transfer rate between the pickup P and the recording buffer WBi, and Vdi indicates data transfer between the encoding module EMi and the recording buffer WBi. Indicates the rate.
[0026]
The area Ai may be provided on the outer peripheral portion of the information recording medium for all i.
[0027]
An information recording apparatus according to the present invention is an information recording apparatus that simultaneously records a plurality of real-time data on an information recording medium according to a simultaneous recording model, wherein the simultaneous recording model accesses an area on the information recording medium. P, an encoding module EMi for encoding the real-time data Di, and a recording buffer WBi for accumulating the encoded real-time data Di, wherein the information recording device is provided in a volume space on the information recording medium. Means for retrieving at least one unallocated area in the volume space as an area Ai for recording real-time data Di, and the real-time data Di stored in the recording buffer WBi for the area Ai. Means for executing a recording operation Wi for recording, and executing the recording operation Wi Then, it is determined whether or not the recording buffer Ai is empty, and if it is determined that the recording buffer WBi is empty, the recording operation Wi is switched to the recording operation Wj (i ≠ j), and the recording buffer WBi is not empty. Means for continuing the recording operation Wi, and each of the at least one area allocated as the area Ai is recorded by at most one access operation and at most two recording operations. The buffer WBi is configured to satisfy the simultaneous recording condition that the buffer WBi can be made empty, where i is an arbitrary integer of 1 or more and n or less, and n is the number of a plurality of real-time data to be simultaneously recorded. Is an arbitrary integer of 2 or more.
[0028]
An information recording apparatus according to the present invention is an information recording apparatus that simultaneously records a plurality of real-time data on an information recording medium according to a simultaneous recording model, wherein the simultaneous recording model accesses an area on the information recording medium. P, an encoding module EMi for encoding the real-time data Di, and a recording buffer WBi for accumulating the encoded real-time data Di, wherein the information recording device is provided in a volume space on the information recording medium. Means for retrieving at least one unallocated area in the volume space as an area Ai for recording real-time data Di, and the real-time data Di stored in the recording buffer WBi for the area Ai. Means for executing a recording operation Wi for recording; It is determined whether or not the time data Di has been recorded to one end of at least one area allocated as the area Ai, and if it is determined that the real-time data Di has been recorded to the end, Means for switching the recording operation Wi to the recording operation Wj (i ≠ j) and, when it is determined that the real-time data Di has not been recorded up to the end, continuing the recording operation Wi, and allocating the area as the area Ai. In each of the at least one area, the real-time data Di stored in the recording buffer WBi is stored once between n access operations and (n-1) recording operations accompanying the switching of the recording operation. , Where the simultaneous recording condition that the recording can be performed by the recording operation is satisfied, where i is an arbitrary integer of 1 or more and n or less. , N is greater than any integer that indicates the number of the plurality of real-time data to be simultaneously recorded.
[0029]
An information recording medium according to the present invention is an information recording medium in which a plurality of real-time data are recorded according to a simultaneous recording model, wherein the simultaneous recording model includes a pickup P for accessing an area on the information recording medium, -Includes an encoding module EMi for encoding the data Di and a recording buffer WBi for storing the encoded real-time data Di, and is allocated as an area Ai for recording the real-time data Di accumulated in the recording buffer WBi. Each of the at least one area is configured to satisfy a simultaneous recording condition that the recording buffer WBi can be made empty by at most one access operation and at most two recording operations. , I is any integer from 1 to n, and n is a plurality of real Is any integer of 2 or greater indicating the number of Lim data.
[0030]
Each of the at least one area allocated as the area Ai has a size of Y or more, where Y = 2 × n × Ta × Vd × VtＶ (Vt−n × Vd), and Ta is Indicates the access time required for the pickup P to access between the innermost area and the outermost area of the information recording medium, and Vt indicates the data between the pickup P and the recording buffer WBi. Vd indicates the data transfer rate between the encoding module EMi and the recording buffer WBi for all i.
[0031]
Each of the at least one area allocated as the area Ai has a size equal to or larger than Yi, where Yi = (2 × n × Ta × Vt × Vdi) ÷ ｛Vt− (Vd1 + Vd2 +... + Vdn)｝, Ta indicates an access time required for the pickup P to access between the innermost area and the outermost area of the information recording medium, and Vt indicates the pickup P and the recording buffer. Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi.
[0032]
Each of the at least one area allocated as the area Ai has a size equal to or larger than Y, where Y = {2 × (T1 +... + Tn) × Vt × Vd} (Vt−n × Vd), Ti is an estimated first access time required for the pickup P to access the area Aj from the area Ai, or one of the at least one area allocated as the area Ai , The estimated second access time required to access the other one, Vt indicates the data transfer rate between the pickup P and the recording buffer WBi, and Vd indicates the On the other hand, a data transfer rate between the encoding module EMi and the recording buffer WBi is shown.
[0033]
Each of the at least one area allocated as the area Ai has a size equal to or greater than Yi, where Yi = {2 × (T1 +... + Tn) × Vt × Vdi} Vt− ( Vd1 + Vd2 +... + Vdn)}, Ti is an estimated first access time required for the pickup P to access the area Aj from the area Ai, or Ti of the at least one area allocated as the area Ai. Estimated second access time required to access the other one from one of them, Vt indicates a data transfer rate between pickup P and recording buffer WBi, and Vdi indicates 5 shows a data transfer rate between the encoding module EMi and the recording buffer WBi.
[0034]
The area Ai may be provided on the outer peripheral portion of the information recording medium for all i.
[0035]
An information recording medium according to the present invention is an information recording medium in which a plurality of real-time data are recorded according to a simultaneous recording model, wherein the simultaneous recording model includes a pickup P for accessing an area on the information recording medium, -Includes an encoding module EMi for encoding the data Di and a recording buffer WBi for storing the encoded real-time data Di, and is allocated as an area Ai for recording the real-time data Di accumulated in the recording buffer WBi. In each of the at least one area, the real-time data Di accumulated in the recording buffer WBi between the n-time access operation accompanying the switching of the recording process and the (n-1) recording operation is recorded once. It is configured to satisfy the simultaneous recording condition that it can be recorded by operation, and here i is any integer of 1 to n, n is greater than any integer that indicates the number of the plurality of real-time data to be simultaneously recorded.
[0036]
Each of the at least one region assigned as region Ai has a size of Yi, where Yi = (n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)}. , Ta indicates the access time required for the pickup P to access between the innermost area and the outermost area of the information recording medium, and Vt indicates the time between the pickup P and the recording buffer WBi. Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi.
[0037]
Each of the at least one region allocated as region Ai has a size of Yi, where Y = {(T1 +... + Tn) × Vt × Vd} (Vt−n × Vd) , Ti indicate the estimated access time required for the pickup P to access the area Aj from the area Ai, Vt indicates the data transfer rate between the pickup P and the recording buffer WBi, and Vd indicates For all i, the data transfer rate between the encoding module EMi and the recording buffer WBi is shown.
[0038]
Each of the at least one region assigned as region Ai has a size of Yi, where Yi = {(T1 +... + Tn) × Vt × Vdi} Vt− (Vd1 + Vd2 +. + Vdn)｝, Ti indicates an estimated access time required for the pickup P to access the area Aj from the area Ai, and Vt indicates a data transfer rate between the pickup P and the recording buffer WBi. , Vdi indicate the data transfer rate between the encoding module EMi and the recording buffer WBi.
[0039]
The area Ai may be provided on the outer peripheral portion of the information recording medium for all i.
[0040]
The method of the present invention is a method for simultaneously reproducing a plurality of real-time data recorded on an information recording medium according to a simultaneous reproduction model, wherein the simultaneous reproduction model includes a pickup P for accessing an area on the information recording medium. A reproduction buffer RBi for storing the real-time data Di read from the information recording medium; and a decoding module DMi for decoding the real-time data Di stored in the reproduction buffer RBi. Performing a reproducing operation Ri for reading out the real-time data Di from the area Ai in which the real-time data Di is recorded; and determining whether or not the reproducing buffer RBi is full during the reproducing operation Ri. When it is determined that the buffer RBi is full, the reproduction operation Ri is performed by the reproduction operation Rj (i j), and when it is determined that the reproduction buffer RBi is not full, the step of continuing the reproduction operation Ri is performed, and each of the at least one region allocated as the region Ai is performed at most once. It is configured to satisfy the simultaneous playback condition that the playback buffer RBi can be full by the access operation and at most two playback operations, where i is any integer from 1 to n, n is an arbitrary integer of 2 or more indicating the number of a plurality of real-time data to be reproduced simultaneously.
[0041]
Each of the at least one area allocated as the area Ai has a size of Y or more, where Y = 2 × n × Ta × Vd × VtＶ (Vt−n × Vd), and Ta is Indicates the access time required for the pickup P to access between the innermost area and the outermost area of the information recording medium, and Vt indicates the data between the pickup P and the reproduction buffer RBi. Vd indicates the data transfer rate between the decoding module DMi and the reproduction buffer RBi for all i.
[0042]
Each of the at least one area allocated as the area Ai has a size equal to or larger than Yi, where Yi = (2 × n × Ta × Vt × Vdi) ÷ ｛Vt− (Vd1 + Vd2 +... + Vdn)｝, Ta indicates an access time required for the pickup P to access between the innermost region and the outermost region of the information recording medium, and Vt indicates the pickup P and the reproduction buffer. Vdi indicates the data transfer rate between the decoding module DMi and the reproduction buffer RBi.
[0043]
A first access time required for the pickup P to access the area Aj from the area Ai, and a time required for accessing the other one from the at least one area allocated as the area Ai. The method may further include estimating the second access time.
[0044]
Each of the at least one area allocated as the area Ai has a size equal to or larger than Y, where Y = {2 × (T1 +... + Tn) × Vt × Vd} (Vt−n × Vd), Ti indicates the first access time or the second access time, Vt indicates a data transfer rate between the pickup P and the reproduction buffer RBi, and Vd indicates the data transfer rate for all i. , The data transfer rate between the decoding module DMi and the reproduction buffer RBi.
[0045]
Each of the at least one area allocated as the area Ai has a size equal to or greater than Yi, where Yi = {2 × (T1 +... + Tn) × Vt × Vdi} Vt− ( Vd1 + Vd2 +... + Vdn)}, Ti indicates the first access time or the second access time, Vt indicates a data transfer rate between the pickup P and the reproduction buffer RBi, and Vdi indicates decoding. The data transfer rate between the module DMi and the reproduction buffer RBi is shown.
[0046]
The area Ai may be provided on the outer peripheral portion of the information recording medium for all i.
[0047]
The real-time data D1 to Dn may include video data and a plurality of audio data, and a part of the video data and at least one of the plurality of audio data may be reproduced simultaneously.
[0048]
The method of the present invention is a method for simultaneously reproducing a plurality of real-time data recorded on an information recording medium according to a simultaneous reproduction model, wherein the simultaneous reproduction model includes a pickup P for accessing an area on the information recording medium. A reproduction buffer RBi for storing the real-time data Di read from the information recording medium; and a decoding module DMi for decoding the real-time data Di stored in the reproduction buffer RBi. Performing a reproducing operation Ri for reading out the real-time data Di from the area Ai in which the real-time data Di is recorded; and in the reproducing operation Ri, the real-time data Di is selected from the at least one area allocated as the area Ai. Judge whether or not the data has been read to one end of the When it is determined that the time data Di has been read to the end, the reproduction operation Ri is switched to the reproduction operation Rj (i ≠ j), and it is determined that the real-time data Di has not been read to the end. Continuation of the reproducing operation Ri, the real-time data stored in the reproducing buffer RBi during one reproducing operation. It is configured to satisfy the simultaneous playback condition that Di can be consumed between n access operations and (n-1) playback operations accompanying switching of playback operations, where i is Any integer from 1 to n, where n is an integer from 2 to 2 indicating the number of a plurality of real-time data to be reproduced simultaneously.
[0049]
Each of the at least one region assigned as region Ai has a size of Yi, where Yi = (n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)}. , Ta indicates an access time required for the pickup P to access between the innermost circumference and the outermost circumference of the information recording medium, and Vt indicates a data transfer rate between the pickup P and the reproduction buffer RBi. Vdi indicates the data transfer rate between the decoding module DMi and the reproduction buffer RBi.
[0050]
The method may further include a step of estimating an access time required for the pickup P to access the area Aj from the area Ai.
[0051]
Each of the at least one area allocated as the area Ai has a size of Y, where Y = {(T1 +... + Tn) × Vt × Vd} (Vt−n × Vd), Ti indicates the access time, Vt indicates the data transfer rate between the pickup P and the reproduction buffer RBi, and Vd indicates the decoding module DMi and the reproduction buffer RBi for all i. And the data transfer rate between the two.
[0052]
Each of the at least one region assigned as region Ai has a size of Yi, where Yi = {(T1 +... + Tn) × Vt × Vdi} Vt− (Vd1 + Vd2 +. + Vdn)｝, Ti indicates the access time, Vt indicates a data transfer rate between the pickup P and the reproduction buffer RBi, and Vdi indicates data transfer between the decoding module DMi and the reproduction buffer RBi. Indicates the rate.
[0053]
The area Ai may be provided on the outer peripheral portion of the information recording medium for all i.
[0054]
The real-time data D1 to Dn may include video data and a plurality of audio data, and a part of the video data and at least one of the plurality of audio data may be reproduced simultaneously.
[0055]
An information reproducing apparatus according to the present invention is an information reproducing apparatus that simultaneously reproduces a plurality of real-time data recorded on an information recording medium according to a simultaneous reproduction model, wherein the simultaneous reproduction model is located in an area on the information recording medium. An access pickup P, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a decoding module DMi for decoding the real-time data Di stored in the reproduction buffer RBi, The information reproducing apparatus includes means for executing a reproducing operation Ri for reading out the real-time data Di from the area Ai in which the real-time data Di is recorded, and determining whether or not the reproducing buffer RBi is full while the reproducing operation Ri is being executed. And if it is determined that the reproduction buffer RBi is full, the reproduction operation R To the reproduction operation Rj (i ≠ j), and when it is determined that the reproduction buffer RBi is not full, the reproduction operation Ri is continued, and at least one of the regions assigned as the regions Ai is , The reproduction buffer RBi can be made full by at most one access operation and at most two reproduction operations, where i is 1 or more and n or less. An arbitrary integer, and n is an arbitrary integer of 2 or more indicating the number of a plurality of real-time data to be reproduced simultaneously.
[0056]
An information reproducing apparatus according to the present invention is an information reproducing apparatus that simultaneously reproduces a plurality of real-time data recorded on an information recording medium according to a simultaneous reproduction model, wherein the simultaneous reproduction model is located in an area on the information recording medium. An access pickup P, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a decoding module DMi for decoding the real-time data Di stored in the reproduction buffer RBi, The information reproducing apparatus includes: means for executing a reproducing operation Ri for reading out the real-time data Di from the area Ai in which the real-time data Di is recorded; and wherein the real-time data Di is assigned as the area Ai in the reproducing operation Ri Read to the end of one of at least one region If it is determined that the real-time data Di has been read to the end, the reproduction operation Ri is switched to the reproduction operation Rj (i ≠ j), and the real-time data Di is read to the end. Means for continuing the reproduction operation Ri when it is determined that the reproduction operation Ri has not been performed, and each of the at least one area allocated as the area Ai is stored in the reproduction buffer RBi during one reproduction operation. The real-time data Di can be consumed between n times of access operations (n-1) times of reproduction operations associated with switching of reproduction operations and a simultaneous reproduction condition that is satisfied; Here, i is an arbitrary integer of 1 or more and n or less, and n is an arbitrary integer of 2 or more indicating the number of a plurality of real-time data to be reproduced simultaneously.
[0057]
The method of the present invention is a method of editing real-time data recorded on an information recording medium so as to guarantee that a plurality of real-time data are simultaneously reproduced according to a simultaneous reproduction model, wherein the simultaneous reproduction model is A pickup P for accessing an area on the information recording medium, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a real-time data Di stored in the reproduction buffer RBi. A decoding module DMi, wherein the method comprises the steps of selecting at least one region from the region Ai where the real-time data Di is recorded, wherein each of the at least one selected region is at most once. Access buffer and at most two playback operations to make the playback buffer RBi full. It encompasses the steps of: determining whether it is configured to satisfy the simultaneous reproduction condition that it is.
[0058]
The method of the present invention is a method of editing real-time data recorded on an information recording medium so as to guarantee that a plurality of real-time data are simultaneously reproduced according to a simultaneous reproduction model, wherein the simultaneous reproduction model is A pickup P for accessing an area on the information recording medium, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a real-time data Di stored in the reproduction buffer RBi. And a decoding module DMi for selecting at least one area from the area Ai in which the real-time data Di is recorded, wherein each of the at least one selected area is played once. Plays real-time data Di stored in playback buffer RBi during operation Determining whether or not the system is configured so as to satisfy the simultaneous playback condition that it can be consumed between n access operations and (n-1) playback operations accompanying the switching of the work. I do.
[0059]
The editing apparatus according to the present invention is an editing apparatus for editing real-time data recorded on an information recording medium so as to guarantee that a plurality of real-time data are simultaneously reproduced according to a simultaneous reproduction model. The model includes a pickup P for accessing an area on the information recording medium, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a real-time data Di stored in the reproduction buffer RBi. A decoding module DMi for decoding, the editing apparatus comprising: means for selecting at least one area from the area Ai in which the real-time data Di is recorded; The reproduction buffer RBi is stored in one access operation and at most two reproduction operations. And a means for determining whether it is configured to satisfy the simultaneous reproduction condition that can be Le.
[0060]
The editing apparatus according to the present invention is an editing apparatus for editing real-time data recorded on an information recording medium so as to guarantee that a plurality of real-time data are simultaneously reproduced according to a simultaneous reproduction model. The model includes a pickup P for accessing an area on the information recording medium, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a real-time data Di stored in the reproduction buffer RBi. A decoding module DMi for decoding, the editing device comprising: means for selecting at least one area from the area Ai in which the real-time data Di is recorded; and wherein each of the at least one selected area is 1 Real-time data D stored in the reproduction buffer RBi during one reproduction operation And a means for determining whether or not the system is configured to satisfy the simultaneous playback condition that the data can be consumed between n access operations and (n-1) playback operations accompanying the switching of the playback operation. It has.
[0061]
The method of the present invention is a method of searching for one piece of video data while playing back k pieces of audio data recorded on an information recording medium according to a simultaneous playback model. A pickup P for accessing an area on the medium, a reproduction buffer RBv for storing video data Dv read from the information recording medium, and a decoding module DMv for decoding the video data Dv stored in the reproduction buffer RBv. A playback buffer RBi for storing audio data Di read from the information recording medium, and a decoding module DMi for decoding the audio data Di stored in the playback buffer RBi. A reproduction operation Rv for partially reading video data Dv from an area Av in which The video data Dv is reproduced intermittently from the n places of the area Av, and then accesses the recording area Ai to switch the reproduction operation Rv to the reproduction operation Ri, and the audio data Di is recorded. A step of executing a reproducing operation Ri for reading the audio data Di from the area Ai, and a step of reading the data amount determined by the simultaneous reproduction condition from the area Ai, accessing the recording area Av, and switching the reproducing operation Ri to the reproducing operation Rv. (N-1) accesses and n read operations in the region Av, accesses from the region Av to the region Ai, (k-1) accesses between the regions Ai, and ( It is consumed in the reproduction buffer DMj between k−1) times of reading data from the area Ai and accessing the area Av from the area Ai. Simultaneous reproduction condition that real-time data Dj can be read out by one reproduction operation and real-time data can be transferred from reproduction buffer RBj to decoding module DMj at m-times speed, where m is the double speed of search. Where i, k, and n are arbitrary integers.
[0062]
An information reproducing apparatus according to the present invention is an information reproducing apparatus that searches for one piece of video data while reproducing k audio data recorded on an information recording medium according to a simultaneous reproduction model. A pickup P for accessing an area on the information recording medium, a reproduction buffer RBv for storing video data Dv read from the information recording medium, and a decoding for decoding video data Dv stored in the reproduction buffer RBv. A decoding module DMv for storing the audio data Di read from the information recording medium, a decoding buffer DMi for decoding the audio data Di stored in the reproduction buffer RBi, The device partially converts the video data Dv from the area Av where the video data Dv is recorded. Means for executing a reproducing operation Rv for reading, means for intermittently reproducing the video data Dv from n places in the area Av, accessing the recording area Ai to switch the reproducing operation Rv to the reproducing operation Ri, Means for executing a reproducing operation Ri for reading the audio data Di from the area Ai in which Di is recorded, and reading the amount of data determined by the simultaneous reproduction condition from the area Ai and then accessing the recording area Av to reproduce the reproducing operation Ri. Means for switching to the operation Rv, wherein (n-1) accesses and n read operations in the region Av, access from the region Av to the region Ai, and (k-1) times between the region Ai Between the access, (k-1) times of reading data from the area Ai, and the access from the area Ai to the area Av, the data is consumed in the reproduction buffer DMj. Simultaneous reproduction that real-time data can be transferred from the reproduction buffer RBj to the decoding module DMj at a speed of m times by reading the obtained real-time data Dj by one reproduction operation and setting the double speed of the search to m. It is configured to satisfy the condition, where i, k and n are arbitrary integers.
[0063]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0064]
(Embodiment 1)
Hereinafter, a method of recording a plurality of real-time data on an information recording medium according to a simultaneous recording model will be described. The simultaneous recording model is the same as the simultaneous recording model shown in FIG. 2 in that it has two recording buffers, recording buffers A and B. Here, the real-time data refers to data including at least one of video data and audio data. The information recording medium refers to any type of recording medium such as an optical disk.
[0065]
FIG. 1 shows the transition of the data amount in the recording buffers A and B of the simultaneous recording model when the real-time data A and B are simultaneously recorded on the information recording medium.
[0066]
In the example shown in FIG. 1, the real-time data A is recorded in the areas 5, 6, 7, and 8 on the information recording medium while the real-time data A is recorded in the areas 1, 2, 3, and 4 on the information recording medium. Record. Here, areas 1 to 4 are areas assigned as areas for recording real-time data A, and areas 5 to 8 are areas assigned as areas for recording real-time data B.
[0067]
In FIG. 1, A1 to A7 indicate an operation (access operation) in which the pickup 74 moves between areas to be accessed. The time required for the access operations A1 to A7 is the time required for the pickup 74 to access between the innermost area and the outermost area of the information recording medium (that is, the maximum access time). Ta). It is assumed that the data transfer rate between the recording buffers A and B and the pickup 74 is constant Vt. It is assumed that the data transfer rate between the encoders A and B and the recording buffers A and B is constant Vd. When data to be recorded is compressed at a variable rate, Vd is the maximum value of the variable rate.
[0068]
In the recording operation W1, the real-time data A stored in the recording buffer A is recorded in the area 1. Since the recording buffer A is not empty at the end of the area 1, switching from recording of real-time data A (recording A) to recording of real-time data B (recording B) does not occur. After the access operation A1, the real-time data A stored in the recording buffer A is recorded in the area 2 in a recording operation W2.
[0069]
During execution of the recording operation W2, the recording buffer A becomes empty. As a result, switching from recording of real-time data A (recording A) to recording of real-time data B (recording B) occurs (access operation A2).
[0070]
In the recording operation W5, the real-time data B stored in the recording buffer B is recorded in the area 5. Since the recording buffer B is not empty at the end of the area 5, switching from real-time data B recording (recording B) to real-time data A recording (recording A) does not occur. After the access operation A3, the real-time data B accumulated in the recording buffer B is recorded in the area 6 in a recording operation W6.
[0071]
During the execution of the recording operation W6, the recording buffer B becomes empty. As a result, switching from recording of real-time data B (recording B) to recording of real-time data A (recording A) occurs (access operation A4).
[0072]
As described above, the simultaneous recording method of the present invention satisfies the simultaneous recording condition that the recording buffers A and B can be made empty by at most one access operation and at most two recording operations. Designed. This makes it possible to guarantee that the real-time data A and B are recorded on the information recording medium without causing the recording buffers A and B to overflow and without causing the recording buffers A and B to underflow. .
[0073]
For example, each of at least one area allocated as an area for recording real-time data A has a size of Y or more, and each of at least one area allocated as an area for recording real-time data B has By having a size of Y or more, the simultaneous recording condition can be satisfied. Therefore, in order to satisfy the simultaneous recording condition, at least one unallocated area having a size of Y or more is searched, and at least one area thus searched is allocated as an area for recording the real-time data A. What should I do? The same applies to the area for recording the real-time data B.
[0074]
In the example shown in FIG. 1, the simultaneous recording condition can be satisfied by each of the regions 1 to 4 having a size of Y or more and each of the regions 5 to 8 having a size of Y or more.
[0075]
Here, the minimum size Y of the recording area and the buffer size B required for the recording buffers A and B are obtained according to the following equations.
[0076]
Y = 4 × Ta × Vd × Vt ÷ (Vt−2 × Vd)
B = (4 × Ta + Y ÷ Vt) × Vd
The expression for the minimum size Y of the recording area is derived as follows.
[0077]
In the recording operation for recording the real-time data A, the data in the recording buffer A is consumed by Vt-Vd, and in the access operation and the recording operation for recording the real-time data B, the data in the recording buffer A is Vd-Vd. Stored. The data amount of the recording buffer A consumed during the recording operation W1, the access operation A1, and the recording operation W2, and the data amount is accumulated between the access operation A2, the recording operation W5, the access operation A3, the recording operation W6, and the access operation A4. It is equal to the data amount of the recording buffer A. Therefore, when two pieces of real-time data are recorded simultaneously, the following equation holds.
[0078]
Y ÷ Vt × (Vt−Vd) −Ta × Vd = (3 × Ta + Y ÷ Vt) × Vd
By modifying this formula, a formula for the minimum size Y of the recording area is obtained.
[0079]
When the number of real-time data to be simultaneously recorded is n (n is an arbitrary integer of 2 or more), the simultaneous recording model includes n encoders and n recording buffers. Is used. In this case, since the number of access operations is proportional to the number of simultaneously recorded real-time data, Y ÷ Vt × (Vt−Vd) −Ta × Vd = ((2 × n−1) × Ta + (n−1) × Y ÷ Vt) × Vd. Therefore, when the number of real-time data to be simultaneously recorded is n, the minimum size Y of the recording area and the size B required for the recording buffer can be obtained according to the following equation.
[0080]
Y = 2 × n × Ta × Vd × Vt ÷ (Vt−n × Vd)
B = (2 × n × Ta + (n−1) × Y / Vt) × Vd
As described above, one of the differences from the conventional example is that the number of access operations is doubled. In the present invention, the access operation switches between recording real-time data A (recording A) and recording real-time data B (recording B) and recording real-time data A (or real-time data B). This occurs when one of the at least one area allocated as the area accesses another one. Therefore, in the present invention, a model that allows four access operations from the time when the recording buffer A (or the recording buffer B) becomes full to the time when the recording buffer A (or the recording buffer B) next becomes full is used. Has defined. This makes it possible to dynamically switch the recording operation in accordance with the transition of the data amount in the recording buffer, and to stably control the transition of the data amount in the recording buffer. That is, when the amount of data in the recording buffer A becomes almost full, the operation of recording the real-time data B is immediately switched to the operation of recording the real-time data A, thereby reducing the amount of data in the recording buffer A. Can be. Further, when the data amount of the recording buffer B becomes almost full, the recording operation of the real-time data A is immediately switched to the recording operation of the real-time data B to reduce the data amount of the recording buffer B. Can be.
[0081]
FIG. 3 shows an example of an area arrangement of an information recording medium (optical disk) on which a file managed by the volume file structure defined by the ECMA167 standard is recorded.
[0082]
3, W1 to W8 indicate the recording operation described with reference to FIG. 1, and A1 to A7 indicate the access operation described with reference to FIG.
[0083]
The upper side of FIG. 3 shows the inner side of the optical disk, and the lower side of FIG. 3 shows the outer side of the optical disk. A volume structure area 11 and a file structure area 12 are allocated to the volume space. The file structure area 12 includes a space bitmap 21 in which an unused area in the volume space is registered as an unallocated area in sector units, and a data structure corresponding to the directory structure shown in FIG. An entry 22, a FILE-A file identification descriptor 23, a FILE-B file identification descriptor 24, a FILE-A file entry 25, and a FILE-B file entry 26).
[0084]
In the ECMA167 standard, an area in which data of a file is recorded is called an extent, and position information of the extent is registered in a file entry. Further, a file identification descriptor is recorded in the file structure area 12 for each file under the directory.
[0085]
The area where real-time data is recorded is called a real-time extent to distinguish it from the area where general data is recorded.
[0086]
In the example shown in FIG. 3, recording areas 13, 14, and 15 on the inner peripheral side of the optical disk are allocated as areas for recording FILE-A real-time data, and record FILE-B real-time data. Recording areas 16, 17, and 18 on the outer peripheral side of the optical disk are allocated as areas. It should be noted that the recording area 15 and the recording area 16 are different in the access time required to access between those areas because the access time required to access from the innermost area to the outermost area of the optical disk. Shall be as far apart as
[0087]
Each of the recording areas 13 to 18 has a size equal to or larger than the minimum size Y of the recording area so as to satisfy the above-described simultaneous recording condition. Thereby, for example, even if the area where the real-time data is actually recorded is a part of the recording area, the real-time data can be recorded in the next recording area after the access operation. Real-time data can be recorded in an area having a size of Y or more. Further, under the simultaneous recording condition described with reference to FIG. 1, the time required for the access operation (access time) is defined as the access time required to access from the innermost area to the outermost area of the optical disc. Therefore, simultaneous recording can be guaranteed regardless of where the recording area is located on the optical disc.
[0088]
FIG. 4 shows a change in the amount of data in the recording buffers A and B.
[0089]
Hereinafter, with reference to FIG. 4, the relationship between the fluctuation of the data rate of the data to be recorded and the transition of the data amount in the recording buffer will be described.
[0090]
It is assumed that recording areas 30 and 31 are allocated as areas for recording real-time data A, and recording areas 35 and 36 are allocated as areas for recording real-time data B. The recording area 31 includes an area 32, an area 33, and an area. The recording area 36 includes an area 37, an area 38, and an area 39.
[0091]
At the time of recording the real-time data A, if the rate of the data transferred to the recording buffer A is the maximum rate, as a result of performing the recording operation W11, the access operation A11, and the recording operation W13, the recording buffer A becomes empty at time t24. become. When the rate of the data transferred to the recording buffer A is smaller than the maximum rate, since the data transferred from the encoder A to the recording buffer A is small, the result of performing the recording operation W11, the access operation A11, and the recording operation W12. At a time t23 earlier than the time t24, the recording buffer A becomes empty. That is, when the data transfer rate from the encoder A to the recording buffer A is low, the recording buffer A becomes empty at an early time. At time t23, when switching from the recording operation of the real-time data A to the recording operation of the real-time data B, the time until the next switching of the recording operation is equal to the time required for three access operations and two recording operations. Since the time is equal to or less than the total time required for two recording operations for recording data in the area, the recording buffer A does not overflow. Further, in the next recording operation, even if data of the maximum rate has to be recorded, the data can be recorded in the area having the size of Y obtained from the condition of simultaneous recording.
[0092]
On the other hand, even when recording the real-time data B, if the rate of the data transferred to the recording buffer B is the maximum rate, the data can be recorded in the Y-size area by one recording operation. When the rate of data transferred to the recording buffer B is the maximum rate, the recording buffer B becomes empty at time t29 as a result of performing the recording operation W14, the access operation A14, and the recording operation W16. When the rate of the data transferred to the recording buffer B is smaller than the maximum rate, since the data transferred from the encoder B to the recording buffer A is small, the result of performing the recording operation W14, the access operation A14, and the recording operation W15 At a time t28 earlier than the time t29, the recording buffer B becomes empty. That is, when the data transfer rate from the encoder B to the recording buffer B is low, the recording buffer B becomes empty at an early time. At time t28, when switching from the recording operation of the real-time data B to the recording operation of the real-time data A, the time until the next switching of the recording operation is equal to the time required for three access operations and two recording operations. Since the time is equal to or less than the total time required for two recording operations for recording data in the area, the recording buffer B does not overflow. Further, in the next recording operation, even if data of the maximum rate has to be recorded, the data can be recorded in the area having the size of Y obtained from the condition of simultaneous recording.
[0093]
Next, an information recording / reproducing apparatus and a simultaneous recording method according to an embodiment of the present invention will be described with reference to FIGS. 3, 5, and 6. FIG.
[0094]
FIG. 5 shows the configuration of the information recording / reproducing apparatus according to the embodiment of the present invention.
[0095]
The information recording / reproducing apparatus includes a system control unit 501, an I / O bus 521, an optical disk drive 531, an input unit 532 for designating a recording mode and starting simultaneous recording, and tuners A and B for receiving TV broadcasts. (Tuners 535 and 536), encoders A and B (encoders 533 and 534) for encoding audio / video signals selected by the tuners A and B, and a decoder A (decoder 540) for decoding audio / video data. , A monitor 542 for reproducing the audio / video output from the decoder A, a decoder B (decoder 541) for decoding the audio data, and a speaker 543 for reproducing the audio output from the decoder B.
[0096]
The system control unit 501 is realized by, for example, a microcomputer and a memory. Each unit included in the system control unit 501 is realized, for example, by a microcomputer executing various programs. Each memory included in the system control unit 501 is realized by, for example, properly using a single memory area for each application.
[0097]
The recording switching unit 502 switches the recording processing of a plurality of real-time data while checking the data amount in the buffer memory. The unallocated area search unit 503 searches the unallocated area in the volume space for an area that satisfies the simultaneous recording condition. The file structure processing unit 504 reads data from the file structure area 12 and analyzes the file structure. The data recording unit 505 instructs the optical disc drive 531 to record data. The data reproducing unit 506 instructs the optical disk drive 531 to reproduce data.
[0098]
The allocated area memory 507 temporarily stores the position information of the recordable area searched by the unallocated area search unit 503. The file structure memory 508 is for temporarily storing data read from the file structure area 12 in a buffer memory. The bitmap memory 509 holds data read from the space bitmap 21 to reduce access to the disk. The recording buffer memories A (recording buffer memory 510) and B (recording buffer memory 511) correspond to the recording buffer A (recording buffer 72) and the recording buffer B (recording buffer 73) of the simultaneous recording model, respectively. And has a buffer memory larger than the size calculated under the simultaneous recording condition. The reproduction buffer memory A (reproduction buffer memory 512) and the reproduction buffer memory B (reproduction buffer memory 513) are buffers for temporarily holding respective data when two data are simultaneously reproduced.
[0099]
The information recording / reproducing apparatus shown in FIG. 5 has a function of simultaneously recording a plurality of real-time data on an information recording medium and a function of simultaneously reproducing a plurality of real-time data recorded on the information recording medium. However, by extracting means relating to simultaneous recording from the information recording / reproducing apparatus shown in FIG. 5, an information recording apparatus having a function of simultaneously recording a plurality of real-time data on an information recording medium is constituted. By extracting means related to simultaneous reproduction from the information recording / reproducing apparatus shown in FIG. 5, an information reproducing apparatus having a function of simultaneously reproducing a plurality of real-time data recorded on an information recording medium is constituted. It goes without saying that it can be done. Further, a function for assuring that a plurality of real-time data including edited real-time data are simultaneously reproduced by extracting means related to editing of real-time data from the information recording / reproducing apparatus shown in FIG. An editing device having the following configuration can be configured.
[0100]
FIG. 6 shows the procedure of the simultaneous recording method. Such a method can be stored in a memory in the system control unit 501 in the form of a program, for example. Such a program can be executed by a microcomputer in the system control unit 501, for example.
[0101]
The user uses the input unit 532 to input a simultaneous recording instruction to the information recording / reproducing apparatus. In accordance with the instruction for simultaneous recording, the minimum size Y of the recording area according to the maximum data rate of the data to be recorded is determined. The method of obtaining the minimum size Y of the recording area is as described with reference to FIG. 1 (Y = 4 × Ta × Vd × Vt ÷ (Vt−2 × Vd)). When recording a specific program such as a movie, the user sets the recording time. In this way, the recording parameters are determined (step S601).
[0102]
The unallocated area search unit 503 determines, for each real-time data to be recorded, an unallocated area having a size equal to or larger than the minimum size Y of the recording area determined in step S601, based on the data held in the bitmap memory 509. To search for. If the user specifies the recording time, the unallocated area in the volume space is searched until the total size of the unallocated area is equal to or more than the product of the maximum rate and the recording time, and at least one unallocated area in the volume space is searched. The allocation area is allocated as an area for recording real-time data (step S602). Therefore, each of at least one area allocated as an area for recording real-time data has a size of Y or more. This makes it possible to satisfy the simultaneous recording condition.
[0103]
In FIG. 3, recording areas 13, 14, and 15 are allocated as areas for recording real-time data A, and recording areas 16, 17, and 18 are allocated as areas for recording real-time data B. Each of the recording areas 13 to 18 has a size of Y or more. The position information of the recording areas 13 to 18 is stored in the allocation area memory 507.
[0104]
The data recording unit 505 instructs the optical disc drive 531 to record the real-time data A stored in the recording buffer memory A on the optical disc, and transfers the real-time data A to be recorded to the optical disc drive 531 (step S603). .
[0105]
In FIG. 3, real-time data A is recorded in a part of the recording area 13 in the recording operation W1. If it is determined in step S605 to be described later that the recording operation is to be continued, the real-time data A is recorded from the beginning of the recording area 14 in the recording operation W2 after the access operation A1.
[0106]
FIG. 3 shows an example in which the real-time data A is recorded from the middle of the recording area 13. However, when recording is started from the recording area 13, the real-time data A is recorded from the beginning of the recording area 13. You may make it.
[0107]
When the user inputs an instruction to end recording to the information recording / reproducing apparatus using the input unit 532, the recording switching unit 502 ends the recording operation (step S604).
[0108]
The recording switching unit 502 determines whether or not the recording buffer memory A is empty, and if it is determined that the recording buffer A is empty, the recording operation of the real-time data A is changed to the recording operation of the real-time data B. When switching is performed, when it is determined that the recording buffer A is not empty, the recording operation of the real-time data A is continued (step S605).
[0109]
In FIG. 3, since the recording buffer memory A becomes empty in the recording operation W2, switching from the recording operation of the real-time data A to the recording operation of the real-time data B occurs. As a result, after the access operation A2, the real-time data B is recorded in a part of the recording area 17 in the recording operation W5. In the recording operation W5, there is no problem in starting the recording of the real-time data B from the middle of the recording area 17. If necessary, another recording area can be accessed and the recording operation of the real-time data B can be continued. In FIG. 3, after the access operation A3, the recording operation of the real-time data B is continued in the recording operation W6.
[0110]
The data recording unit 505 instructs the optical disc drive 531 to record the real-time data B stored in the recording buffer memory B on the optical disc, and transfers the real-time data B to be recorded to the optical disc drive 531 (step S606). .
[0111]
The recording switching unit 502 determines whether or not the recording buffer memory B is empty, and when it is determined that the recording buffer B is empty, the recording operation of the real-time data B is changed to the recording operation of the real-time data A. If it is determined that the recording buffer B is not empty, the recording operation of the real-time data B is continued (step S607).
[0112]
In FIG. 3, since the recording buffer memory B becomes empty in the recording operation W6, switching from the recording operation of the real-time data B to the recording operation of the real-time data A occurs. As a result, after the access operation A4, the real-time data A is recorded in the remaining area of the recording area 14 in the recording operation W3. In the recording operation W3, there is no problem in starting the recording of the real-time data A from the middle of the recording area 14. If necessary, another recording area can be accessed and the recording operation of the real-time data A can be continued. In FIG. 3, after the access operation A5, the recording operation of the real-time data A is continued in the recording operation W4.
[0113]
When the recording of all data is completed, the file structure processing unit 504 records a file entry in the file structure area 12 in order to manage the area where the real-time data is recorded as a real-time extent (step S1). S608).
[0114]
As described above, the recording operation of the real-time data A and the recording operation of the real-time data B are switched while checking the accumulation state of the data in the recording buffer memories A and B.
[0115]
Although an example in which two real-time data are successively recorded has been described, three data can be recorded in a recording area having a size equal to or larger than an access operation twice as many as the number of real-time data. The above real-time data can be recorded continuously.
[0116]
When n pieces of real-time data are simultaneously recorded on the information recording medium, the pickup P for accessing an area on the information recording medium, the encoding module EMi for encoding the real-time data Di, and the encoded module EMi A simultaneous recording model (hereinafter, referred to as an "n-simultaneous recording model") including a recording buffer WBi for storing the real-time data Di is used. In this case, the following operation may be performed in each step described above.
[0117]
Step S602: The unallocated area search means 503 searches for an unallocated area in the volume space on the information recording medium, and allocates at least one unallocated area in the volume space as an area Ai for recording the real-time data Di. .
[0118]
Steps S603 and S606: The optical disk drive 531 executes the recording operation Wi for recording the real-time data Di stored in the recording buffer WBi in the area Ai according to the recording instruction from the data recording unit 505.
[0119]
Steps S605 and S607: The recording switching unit 502 determines whether the recording buffer WBi is empty during the execution of the recording operation Wi. If it is determined that the recording buffer WBi is empty, the recording switching unit 502 performs recording. The operation Wi is switched to the recording operation Wj (i ≠ j), and when it is determined that the recording buffer WBi is not empty, the recording operation Wi is continued.
[0120]
Here, each of the at least one area allocated as the area Ai satisfies the simultaneous recording condition that the recording buffer WBi can be made empty by at most one access operation and at most two recording operations. Is configured.
[0121]
For example, the simultaneous recording condition can be satisfied by each of the at least one area allocated as the area Ai having a size of Y or more. The method of obtaining the minimum size Y of the recording area is as described with reference to FIG.
[0122]
Y = 2 × n × Ta × Vd × Vt ÷ (Vt−n × Vd)
Ta indicates an access time required for the pickup P to access between an innermost area and an outermost area of the information recording medium.
[0123]
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi.
[0124]
Vd indicates the data transfer rate between the encoding module EMi and the recording buffer WBi for all i.
[0125]
Note that i is an arbitrary integer of 1 or more and n or less, and n is an arbitrary integer of 2 or more indicating the number of a plurality of real-time data to be simultaneously recorded.
[0126]
It should be noted that skip recording may be performed on an area allocated in advance. Skip recording is a method of performing recording while avoiding a defective sector detected in advance or a defective sector detected during data recording. For example, in FIG. 8 showing the skip recording operation, it is assumed that no defective sector is detected in the area 40 before recording, and the defective areas 41, 42, and 43 are detected during recording. In this case, the data to be recorded in the defective area is recorded in an area next to the defective area in order to perform recording while avoiding the defective area. In the example of FIG. 8, data is recorded in the order of skip recording SW1, SW2, SW3, and SW4. In the skip recording, since the access time is short, the skip recording may be performed while avoiding an area including a defective area in an ECC block unit instead of a sector unit. Assuming that the size of the ECC block is E, the access time of the ECC block in skip recording in ECC block units is E ÷ Vt. In the simultaneous recording, in order to ensure compatibility between devices, the number of ECC blocks to be skipped may be limited. For example, let e be the ratio of skippable areas in skip recording. When skip recording is applied under the conditions of simultaneous recording shown in FIG. 1, the minimum size of the recording area is set to Ye, and recording is performed in the area of Ye × (1-e), and the area of Ye × e is Only access is performed to be skipped. The condition of simultaneous recording considering skip recording when the ratio is within a specific ratio is as follows: Ye × (1−e) デ ー タ Vt × (Vt−Vd) −Ta × Vd −Ye × e ÷ Vt × Vd = (3 × Ta + Ye × (1-e) ÷ Vt) × Vd + Ye × e ÷ Vt × Vd, and Ye = 4 × Ta × Vd × Vt ÷ (Vt−e × Vt−2) × Vd). The buffer size Be required in this case is Be = (4 × Ta + Ye × (1-e) ÷ Vt) × Vd + 2 × Ye × e ÷ Vt × Vd.
[0127]
It should be noted that recording may be performed in units of ECC blocks instead of recording in units of sectors.
[0128]
Although not shown, a predetermined threshold value in the buffer is determined as a value for determining that the buffer is empty, and if the value falls below this value, it is determined that the buffer is empty. For this reason, the size of the buffer memory may have a minimum read / write unit margin or a rotation wait margin.
[0129]
Since the recording process is switched at an optimal timing, even if an error occurs during the recording operation and recording and reproduction cannot be performed for a certain period of time, pull-in to the steady state is quick.
[0130]
The diagram in FIG. 2 is a model, and an encoder and a decoder are not necessarily required. A system such as a streamer that handles only digital signals does not have an encoder or a decoder, but by applying the present invention to a streamer, it is possible to obtain an effect that AV data can be transferred without interruption.
[0131]
(Embodiment 2)
An embodiment in which the transfer rates of real-time data are different will be described. In the first embodiment, the conditions for simultaneous recording have been described on the assumption that the transfer rates are the same. In the present embodiment, simultaneous recording conditions are determined for data having a high transfer rate and data having a low transfer rate, so that data having a low transfer rate can be recorded even in a small continuous empty area. Can also be smaller.
[0132]
FIG. 9 shows two real-time data recording operations and an access operation, wherein recording of real-time data A with a high transfer rate is record A and recording of real-time data B with a low transfer rate is record B. The simultaneous recording model is the same as that shown in FIG. 2 described in the first embodiment. The change in the amount of data in the recording buffer during the simultaneous recording operation has been described in the first embodiment, and will not be described.
[0133]
FIG. 10 shows the layout of the recording area on the disk, with the left side showing the inner side of the disk and the right side showing the outer side of the disk. In FIG. 10, recording areas 111, 112, and 113 are areas allocated as areas for recording real-time data A, and recording areas 114, 115, and 116 are allocated as areas for recording real-time data B. Area. The real-time data A is actually recorded in a part 101 of the recording area 111, parts 102 and 103 of the recording area 112, and a part 104 of the recording area 113. The real-time data B is actually recorded in a part 105 of the recording area 114, parts 106 and 107 of the recording area 115, and a part 108 of the recording area 116.
[0134]
In FIG. 9, A21 to A27 indicate an operation (access operation) in which the pickup 74 moves between areas to be accessed. The time required for the access operations A1 to A27 is the time required for the pickup 74 to access between the innermost area and the outermost area of the disk (that is, the maximum access time Ta). And It is assumed that the data transfer rate between the recording buffers A and B and the pickup 74 is constant Vt. The data transfer rate between the encoder A and the recording buffer A is Vd1, which is the maximum value of the variable rate, and the data transfer rate between the encoder B and the recording buffer B is Vd2, which is the maximum value of the variable rate. And
[0135]
In a recording operation W21, real-time data A is recorded in the area 101. After the access operation A21, the real-time data A is recorded in the area 102 in a recording operation W22. Thereafter, switching from the recording operation of the real-time data A to the recording operation of the real-time data B occurs (access operation A22).
[0136]
In the recording operation W25, the real-time data B is recorded in the area 105. After the access operation A23, the real-time data B is recorded in the area 106 in a recording operation W26. Thereafter, switching from the recording operation of the real-time data B to the recording operation of the real-time data A occurs (access operation A24).
[0137]
Thus, the simultaneous recording method of the present invention is designed to satisfy the simultaneous recording condition that the recording operation is switched by at most one access operation and at most two recording operations.
[0138]
In the recording operation for recording the real-time data A, the data in the recording buffer A is consumed by Vt−Vd1, and in the access operation and the recording operation for recording the real-time data B, the data in the recording buffer A is Vd1. Stored. The amount of data in the recording buffer A consumed during the recording operation W21, the access operation A21, and the recording operation W22, and is accumulated between the access operation A22, the recording operation W25, the access operation A23, the recording operation W26, and the access operation A24. It is equal to the data amount of the recording buffer A. Therefore, if the minimum size of at least one recording area allocated as an area for recording real-time data A is Y1, and the minimum size of at least one recording area allocated as an area for recording real-time data B is Y2, The following equation holds.
[0139]
Y1 ÷ Vt × (Vt−Vd1) = (4Ta + Y2 ÷ Vt) × Vd1
Y2 ÷ Vt × (Vt−Vd2) = (4Ta + Y1 ÷ Vt) × Vd2
By modifying this equation, the equations for the minimum sizes Y1 and Y2 of the recording area can be obtained.
[0140]
Y1 = (4Ta × Vt × Vd1) ÷ (Vt−Vd1−Vd2)
Y2 = (4Ta × Vt × Vd2) ÷ (Vt−Vd1−Vd2)
Each of at least one recording area allocated as an area for recording real-time data A has a size of Y1 or more, and at least one recording area allocated as an area for recording real-time data B has By having a size equal to or larger than Y2, it is possible to satisfy a simultaneous recording condition for recording two real-time data having different data transfer rates without loss.
[0141]
The buffer size B1 required for the recording buffer A and the buffer size B2 required for the recording buffer B are obtained according to the following equations.
[0142]
B1 = (4Ta + Y2 ÷ Vt) Vd1
B2 = (4Ta + Y1 ÷ Vt) Vd2
Thus, if Vd1> Vd2, Y2 and B2 can be made smaller than Y1 and B1, respectively.
[0143]
When recording the real-time data, if the maximum transfer rate of the data to be recorded is known in advance, data can be recorded by allocating a continuous free area larger than the size satisfying the above simultaneous recording condition to the recording area. .
[0144]
As described above, in the simultaneous recording method described in FIG. 6 of the first embodiment, the simultaneous recording of the present embodiment can be performed by changing the expression of the simultaneous recording condition in the search for the unallocated area.
[0145]
If the transfer rate is not known until immediately before recording, the data to be recorded first is the maximum value of the transfer rate, the transfer rate of data to be recorded in the future is the maximum value allowed by the system, and the recording area of the data to be recorded is simultaneous recording. Can be searched to satisfy the condition. When recording the second data, the transfer rate can be known, so that a recording area having an optimal size can be searched.
[0146]
The configuration of the information recording / reproducing apparatus is the same as the configuration described in the first embodiment, except for the sizes of the recording buffer memories A and B. The algorithm for switching between the recording operation of the real-time data A and the recording operation of the real-time data B is the same as that described in the first embodiment. That is, when the recording buffer memory A becomes empty, the recording operation of the real-time data A is switched to the recording operation of the real-time data B, and when the recording buffer memory B becomes empty, the recording operation of the real-time data B is performed in real time. The operation is switched to the data A recording operation.
[0147]
The present invention is also applicable to a case where a digital broadcast of a plurality of channels is recorded. When recording high-definition video data and low-rate video data for mobile devices, use the maximum transfer rate of each to effectively use the free space on the disk that has been repeatedly recorded and erased many times. I can do it. In addition, since there is no need to interleave low-rate data with high-rate data and record it, low-rate data can be recorded as close as possible, making it possible to transfer low-rate data to mobile terminals. There is also an advantage that data can be transferred at high speed with less access.
[0148]
FIG. 11 shows a recording operation and an access operation of three real-time data having different data transfer rates. 9, W31 to W42 denote a recording operation, A31 to A40 denote an access operation, and 121 to 132 denote recording areas where real-time data is actually recorded. Based on FIG. 11, when conditions for simultaneously recording three real-time data are obtained, as in the case of recording two real-time data simultaneously,
Y1 = (6Ta × Vt × Vd1) ÷ (Vt−Vd1−Vd2−Vd3)
Y2 = (6Ta × Vt × Vd2) ÷ (Vt−Vd1−Vd2−Vd3)
Y3 = (6Ta × Vt × Vd3) ÷ (Vt−Vd1−Vd2−Vd3)
B1 = (6Ta + Y2 ÷ Vt + Y3 ÷ Vt) Vd1
B2 = (6Ta + Y3 ÷ Vt + Y1 ÷ Vt) Vd2
B3 = (6Ta + Y1 ÷ Vt + Y2 ÷ Vt) Vd3
It becomes. Here, Y, Vd, and B indicate the minimum size of the recording area, the transfer rate of the data to be recorded, and the buffer size of the recording buffer, respectively, and the subscript indicates the number of the real-time data to be recorded.
[0149]
Further, when simultaneously recording n pieces of real-time data on the information recording medium, the above-described “n-simultaneous recording model” is used. The minimum size Yi of each of the at least one recording area allocated as the area Ai for recording the real-time data Di and the size Bi of the recording buffer WBi for storing the real-time data Di are obtained according to the following equations.
[0150]
Yi = (2 × n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)}
Bi = {2 × n × Ta + (Y1 + Y2 +... + Yn)} Vt−Yi ÷ Vt｝ Vdi
Ta indicates an access time required for the pickup P to access between an innermost area and an outermost area of the information recording medium.
[0151]
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi.
[0152]
Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi.
[0153]
Note that i is an arbitrary integer of 1 or more and n or less, and n is an arbitrary integer of 2 or more indicating the number of a plurality of real-time data to be simultaneously recorded.
[0154]
Note that the above-described conditions for simultaneous recording are also applicable when the transfer rates of the real-time data are the same (that is, when Vd1 = Vd2 =... = Vdn).
[0155]
(Embodiment 3)
An embodiment in the case of simultaneous recording of real-time data at a fixed transfer rate with different transfer rates of real-time data will be described. DV format data used in digital video cameras has a fixed transfer rate instead of variable rate data as in MPEG. In the case of fixed-rate real-time data, if the optimal size of the recording area can be determined, the recording operation can be switched in units of recording area, so that the switching operation can be simplified and the size of the recording area can be reduced. I can do it.
[0156]
FIG. 25 is a diagram showing a layout of a recording area in which two real-time data are simultaneously recorded. As shown in the figure, the size of each recording area is recorded at a fixed size that differs for each type of data to be recorded.
[0157]
FIG. 12 shows a recording operation and an access operation of two real-time data having different data transfer rates. 9, W51 to W54 indicate a recording operation, A51 to A53 indicate an access operation, and 151 to 154 indicate a recording area. Since the rate is fixed, the switching of the recording operation can be performed in units of areas. Therefore, the recording operation can be switched when the recording in one recording area is completed.
[0158]
The configuration of the information recording / reproducing apparatus is the same as the configuration of the information recording / reproducing apparatus shown in FIG. 5, except that the operation of the unallocated area search unit 503 and the operation of the recording switching unit 502 are different.
[0159]
FIG. 26 shows the procedure of the simultaneous recording method. Such a method can be stored in a memory in the system control unit 501 in the form of a program, for example. Such a program can be executed by a microcomputer in the system control unit 501, for example.
[0160]
The procedure of simultaneous recording shown in FIG. 26 is different in that the conditional expression for simultaneous recording in the unallocated area search step (S701) is different and that the conditions for switching between data recording A and data recording B (S702, S703) are different. Except for this, the procedure is the same as the simultaneous recording procedure shown in the first embodiment (FIG. 6).
[0161]
In step S701, the unallocated area search unit 503 searches for an unallocated area having a size of Y1 (or Y2), and stores at least one unallocated area thus searched for in an area for recording real-time data. Assigned as How to determine Y1 and Y2 will be described later.
[0162]
In step S702, the recording switching unit 502 determines whether or not the real-time data A has been recorded to the end of at least one recording area allocated as the area for recording the real-time data A in the recording operation of the real-time data A. If it is determined that the real-time data A has been recorded to the end of the recording area, the recording operation of the real-time data A is switched to the recording operation of the real-time data B, and the real-time data A is recorded. If it is determined that the data has not been recorded up to the end of the area, the recording operation of the real-time data A is continued.
[0163]
In step S703, the recording switching unit 502 determines whether or not the real-time data B has been recorded to the end of at least one recording area allocated as an area for recording the real-time data B in the recording operation of the real-time data B. If it is determined that the real-time data B has been recorded to the end of the recording area, the recording operation of the real-time data B is switched to the recording operation of the real-time data A, and the real-time data B is recorded. If it is determined that the data has not been recorded up to the end of the area, the recording operation of the real-time data B is continued.
[0164]
The data amount of the recording buffer A consumed during the recording operation W51 is equal to the data amount of the recording buffer A accumulated during the access operation A51, the recording operation W53, and the access operation A52. Accordingly, assuming that the size of at least one recording area allocated as an area for recording real-time data A is Y1 and the size of at least one recording area allocated as an area for recording real-time data B is Y2, The formula holds.
[0165]
Y1 ÷ Vt × (Vt−Vd1) = (2Ta + Y2 ÷ Vt) × Vd1
Y2 ÷ Vt × (Vt−Vd2) = (2Ta + Y1 ÷ Vt) × Vd2
By modifying this equation, an equation for the size Y1 and Y2 of the recording area can be obtained.
[0166]
Y1 = (2Ta × Vt × Vd1) ÷ (Vt−Vd1−Vd2)
Y2 = (2Ta × Vt × Vd2) ÷ (Vt−Vd1−Vd2)
The buffer size B1 required for the recording buffer A and the buffer size B2 required for the recording buffer B are obtained according to the following equations.
[0167]
B1 = (2Ta + Y2 ÷ Vt) Vd1
B2 = (2Ta + Y1 ÷ Vt) Vd2
By using the different recording rates to set simultaneous recording conditions for fixed-rate real-time data, real-time data can be recorded in a smaller recording area for low-rate data. And the free space on the disk can be used effectively.
[0168]
Considering the case of recording three real-time data with the same considerations, FIG. 13 shows a recording operation and an access operation.
Y1 = (3Ta × Vt × Vd1) ÷ (Vt−Vd1−Vd2−Vd3)
Y2 = (3Ta × Vt × Vd2) ÷ (Vt−Vd1−Vd2−Vd3)
Y3 = (3Ta × Vt × Vd3) ÷ (Vt−Vd1−Vd2−Vd3)
B1 = (3Ta + Y2 ÷ Vt + Y3 ÷ Vt) Vd1
B2 = (3Ta + Y3 ÷ Vt + Y1 ÷ Vt) Vd2
B3 = (3Ta + Y1 ÷ Vt + Y2 ÷ Vt) Vd3
It becomes.
[0169]
Further, when simultaneously recording n pieces of real-time data on the information recording medium, the above-described “n-simultaneous recording model” is used. In this case, the following operation may be performed in steps S701, S603, S606, S702, and S703 shown in FIG.
[0170]
Step S701: The unallocated area search unit 503 searches for an unallocated area in the volume space on the information recording medium, and allocates at least one unallocated area in the volume space as an area Ai for recording the real-time data Di.
[0171]
Steps S603 and S606: The optical disk drive 531 executes the recording operation Wi for recording the real-time data Di stored in the recording buffer WBi in the area Ai according to the recording instruction from the data recording unit 505.
[0172]
Steps S702 and S703: The recording switching unit 502 determines whether or not the real-time data Di has been recorded to the end of at least one of the at least one recording area allocated as the area Ai in the recording operation Wi. When it is determined that the data Di has been recorded to the end of the recording area, the recording operation Wi is switched to the recording operation Wj (i ≠ j), and the real-time data Di is not recorded to the end of the recording area. Is determined, the recording operation Wi is continued.
[0173]
Here, each of the at least one recording area allocated as the area Ai for recording the real-time data Di is provided between n access operations and (n-1) recording operations accompanying the switching of the recording operation. The real-time data Di accumulated in the recording buffer WBi is recorded in one recording operation so as to satisfy a simultaneous recording condition.
[0174]
For example, the simultaneous recording condition can be satisfied by each of at least one recording area allocated as the area Ai for recording the real-time data Di having the size of Yi.
[0175]
The size Yi of the recording area and the size Bi of the recording buffer WBi are obtained according to the following equations.
[0176]
Yi = (n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)}
Bi = {n * Ta + (Y1 + Y2 +... + Yn)} Vt-Yi {Vt} Vdi
Ta indicates an access time required for the pickup P to access between an innermost area and an outermost area of the information recording medium.
[0177]
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi.
[0178]
Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi.
[0179]
Note that i is an arbitrary integer of 1 or more and n or less, and n is an arbitrary integer of 2 or more indicating the number of a plurality of real-time data to be simultaneously recorded.
[0180]
Next, the access performance of a drive for recording and reproducing a disc will be described. FIG. 14 is a diagram showing the breakdown of the access time of the drive when accessing the sector of the target track. When the access distance is long, the pickup moves and it takes an access time corresponding to the coarse seek. When recording data, in the case of a CLV type (constant linear velocity) disk, the number of rotations of the disk must be changed according to the radial position to be accessed. It takes a spindle lock time to adjust to a predetermined rotation speed. If the number of rotations of the disk is locked, an address search can be performed. Therefore, it takes an access time corresponding to a fine seek for performing a multi-jump in units of a plurality of tracks mainly using an optical system of a pickup and accessing a target track. Thereafter, by waiting for rotation until a predetermined sector comes, recording or reproduction becomes possible. If the access distance is within the range of the fine seek, the access time is the fine seek and the rotation wait time. If the access is 1/3 of the disk capacity, the spindle lock time and the coarse seek time are defined as the access time. You can do it.
[0181]
In this manner, by checking the access performance of the drive in advance and determining it, the access time between the extents in simultaneous recording can use the access time required from the access performance of the drive instead of the full seek. Thus, under the simultaneous recording condition, a value smaller than the full seek time can be used, so that recording can be performed in a smaller continuous recording area. In addition, even if the extent is shortened at the time of editing, the number of cases where it can be determined that continuous reproduction is possible increases.
[0182]
FIG. 27 is a diagram showing an access at the time of simultaneous recording of three real-time data and a layout of a recording area. For example, if the recording area 128 and the recording area 129 are separated from each other by the distance between the innermost area and the outermost area of the disk, the time required for the access operations A40, A34, and A36 is equal to the full seek access time. If the recording area 122 and the recording area 121 are separated from each other by a distance of about 100 tracks, the time required for the access operation A31 is substantially equal to the access time of the fine seek.
[0183]
In the simultaneous recording method shown in FIG. 6, the estimation of the access time (the first access time or the second access time) is performed in the unallocated area search step S602. In the simultaneous recording method shown in FIG. 26, the estimation of the access time is performed in the unallocated area search step S701. The estimation of the access time is performed by the unallocated area search unit 503 (FIG. 5).
[0184]
Therefore, the conditions for simultaneous recording described in the second embodiment are as follows, considering the estimation of the access time.
[0185]
Yi = {2 × (T1 +... + Tn) × Vt × Vdi｝ ÷ ｛Vt− (Vd1 + Vd2 +... + Vdn)}
Bi = {2 × (T1 +... + Tn) + (Y1 + Y2 +... + Yn)} Vt−Yi ÷ Vt｝ Vdi
Here, Ti indicates the first access time or the second access time. The first access time refers to an access time required for the pickup P to access the area Aj for recording the real-time data Dj from the area Ai for recording the real-time data Di. The second access time refers to an access time required to access another one from at least one of the recording areas allocated as the area Ai for recording the real-time data Di.
[0186]
Note that i is an arbitrary integer of 1 or more and n or less, and n is an arbitrary integer of 2 or more indicating the number of a plurality of real-time data to be simultaneously recorded.
[0187]
Note that the above-described conditions for simultaneous recording are also applicable when the transfer rates of the real-time data are the same (that is, when Vd1 = Vd2 =... = Vdn).
[0188]
The conditions for simultaneous recording described in the third embodiment are as follows, considering the estimation of access time.
[0189]
Yi = {(T1 +... + Tn) × Vt × Vdi {Vt− (Vd1 + Vd2 +... + Vdn)}
Bi = {(T1 +... + Tn) + (Y1 + Y2 +... + Yn)} Vt-Yi {Vt} Vdi
Here, Ti indicates an access time required for the pickup P to access the area Aj for recording the real-time data Dj from the area Ai for recording the real-time data Di.
[0190]
Note that i is an arbitrary integer of 1 or more and n or less, and n is an arbitrary integer of 2 or more indicating the number of a plurality of real-time data to be simultaneously recorded.
[0191]
Note that the above-described conditions for simultaneous recording are also applicable when the transfer rates of the real-time data are the same (that is, when Vd1 = Vd2 =... = Vdn).
[0192]
Next, a method of improving the disk use efficiency and the editability by limiting the full seek time will be described. FIG. 15 is a diagram showing the relationship between the rotation speed difference of the drive spindle motor and the access time,
TRQ = (N1-N2) .J / (dt.Kj)
On the assumption that the access time Tacc is
Tacc = (spindle lock time) + (rotation wait time) + constant
= (N1−N2) × J ÷ (TRQ × KJ) + Trev + constant
≒ A × dN + B
Here, A, B: constants, dN: rotation speed difference (= N1−N2), dt: spindle lock time, J: disk inertia, Kj: conversion constant, N1: rotation speed before access, N2: after access , Trev: rotation waiting time, TRQ: motor torque, and an access performance model set from the relationship between the disk rotation speed difference and the access time. When the pickup is moved to the vicinity of the target track as described with reference to FIG. 14, a coarse seek and a change in the rotation speed of the spindle motor are required. In the performance of the spindle motor used in the optical disk drive, the access time is dominated by the change in the spindle speed. Therefore, noting that the spindle lock time is proportional to the difference in the number of rotations, the access time can be formulated as described above. Furthermore, when the rotation waiting time Trev is sufficiently smaller than the spindle lock time, the access time Tacc can be omitted, and the access time Tacc can be estimated linearly with respect to the disk rotation speed difference dN.
[0193]
Further, when the initial position and the target position of the pickup are known, the rotational speed and the rotational speed difference of the disk can be uniquely obtained from the relationship with the linear velocity of the disk.
Assuming that the address before access is A1, the address after access is A2, and the radial positions are r1 and r2, respectively, and the radial position where the address is 0 is r0, the address is proportional to the band-shaped area. So, let C be a constant,
A1 = C · (π · r1 · r1−π · r0 · r0)
A2 = C · (π · r2 · r2−π · r0 · r0)
Since the rotation speed at a certain address is inversely proportional to the radius, the rotation speeds of A1 and A2 are defined as N1, N2, and D as constants.
N1 = D / r1
N2 = D / r2
Therefore, the rotation speed can be obtained from the address by using the above relational expression.
[0194]
FIG. 16 is a diagram showing the relationship between the radial position of the disk and the number of rotations, and shows an example of a disk having a diameter of 12 cm, a capacity of 25 GB, and a read rate of 72 Mbps. Since the product of the radial position and the number of rotations is constant, when access is made at the same distance in the radial direction, the difference in the number of rotations is smaller on the outer circumference than on the inner circumference, so that the access time is shorter. The volume space is an area with a radius of 24 mm to 58 mm, and the full seek time is proportional to the rotational speed difference 2270 rpm. If the area for recording the AV data is an area with a radius of 38 mm to 58 mm, the access time is approximately 2.7 times smaller because the access time is proportional to the rotation speed difference of 840 rpm. As shown in FIG. 28, in the case where the worst access time in the area from the radius of 24 mm to 58 mm is 1000 msec, if the recording area is provided in the range from the radius of 38 mm to 58 mm, the worst access time becomes 370 msec. The capacity of the area from the radius of 38 mm to 58 mm is reduced by about 30% to 17 GB. If the demand for the capacity is not strong, the access time can be set by setting the recording area of the AV data on the outer peripheral side as a high-speed access zone. Can be greatly reduced, and the size of the necessary continuous recording area under the condition of simultaneous recording can be reduced in proportion to this. Therefore, when performing cut editing or AV split editing, setting a high-speed access zone increases the number of cases where continuous playback can be performed even if the extent is shortened.
[0195]
When performing recording using the above characteristics, the disc may be classified into a disc in which a high-speed access zone is set and a disc in which no high-speed access zone is set. When a high-speed access zone is set, information indicating a class may be recorded in the lead-in area or the volume space as class 1, otherwise, it may be recorded as class 0. Further, the maximum access time in the high-speed access zone may be further recorded together with the class information. By doing so, even if the disc is inserted into a different device, the information on the class can be known, so that the compatibility between the devices is improved.
[0196]
In addition, when a 25 GB optical disk is used for a consumer video recorder such as a VTR, the recording time can be as long as 10 hours. Will be able to do this on the disc. In such a case, editing performance after recording can be secured by setting a plurality of high-speed access zones.
[0197]
Further, in a two-layer disc, zones are provided on each of the recording surfaces of the first and second layers so that the radial positions are the same, and a high-speed access zone composed of these two zones is set. By providing a high-speed access zone in a single-layer disc, the capacity reduction becomes an issue, but it is solved in a two-layer disc. Note that the radius positions of the recording surfaces of the first and second layers cannot be set to exactly the same radius position due to physical intersection, but the recording surfaces of the first and second layers are respectively different. The access time by switching the focus is about the focus switching time of the pickup and the rotation waiting time, so it is generally smaller than fine seek, and the switching time between layers is the time to access from the innermost circumference to the outermost circumference in the high-speed access zone. Small enough.
[0198]
When n pieces of real-time data are simultaneously recorded on the information recording medium, the area Ai for recording the real-time data Di is set to the outer peripheral portion (for example, (In the high-speed access zone). Thus, the access time can be reduced.
[0199]
(Embodiment 4)
In the present embodiment, related audio data and video data are recorded in separate areas, and after recording, the conditions of whether or not simultaneous reproduction is possible when cut editing is performed are described with reference to FIGS. 18, 19, and 20. A description will be given using three specific examples indicated by. In the cut editing, a reproduction start point (hereinafter referred to as an in point) and a reproduction end point (hereinafter referred to as an out point) are sequentially designated with respect to recorded real-time data so that a plurality of sections can be sequentially reproduced. That means. If the audio data and the video data are not recorded as one MPEG stream but each are recorded in separate areas, the audio data and the video data can be regarded as two real-time data. Simultaneous recording can be performed using the method described in the first, second, and third embodiments.
[0200]
FIG. 17 shows a simultaneous reproduction model for simultaneously reproducing two real-time data. The simultaneous reproduction model includes a pickup 74 for recording and reproducing real-time data on an information recording medium, a reproduction buffer A (reproduction buffer 78) for storing real-time data A read from the information recording medium, and a reproduction buffer A A decoder A (decoder 76) for decoding the real-time data A stored in the memory, a reproduction buffer B (reproduction buffer 79) for storing the real-time data B read from the information recording medium, and a reproduction buffer B And a decoder B (decoder 77) for decoding the obtained real-time data B.
[0201]
The difference between the simultaneous playback model and the simultaneous recording model is that, in simultaneous playback, data is accumulated in the playback buffer when data is read out, and playback of real-time data may be interrupted unless the playback buffer becomes empty at the time of access. On the other hand, in simultaneous recording, when data is recorded, the data in the recording buffer decreases, and at the time of access, if the data is accumulated in the recording buffer and the data does not overflow from the recording buffer, the recorded data may be lost. There is no point.
[0202]
The conditions for simultaneous reproduction for simultaneously reproducing a plurality of real-time data recorded on the information recording medium are similar to the conditions for simultaneous recording. The difference is that the data transfer rate such as Vt, Vd, Vd1, Vd2 means not the data transfer rate for recording but the data transfer rate for reproduction. That is, in simultaneous reproduction, Vt means the data transfer rate between the pickup 74 and the reproduction buffers A and B, and Vd indicates the data transfer rate between the decoders A and B and the reproduction buffers A and B. Vd1 means the data transfer rate between the decoder A and the reproduction buffer A, and Vd2 means the data transfer rate between the decoder B and the reproduction buffer B.
[0203]
FIG. 29 is a diagram showing an access for simultaneous reproduction on a disc and a layout of a variable-size recording area when simultaneously reproducing data recorded in the recording area described in the first embodiment. Simultaneously recorded data can be reproduced simultaneously using a reproducing device similar to the recording device.
[0204]
FIG. 30 is a flowchart showing a simultaneous reproduction method corresponding to the simultaneous recording method when the recording rate of the data to be recorded is temporally variable. The difference from the recording is that the recording buffer is a reproduction buffer and the condition for switching from one reproduction to the other reproduction is different. That is, in the simultaneous reproduction, the reproduction operation is switched when the reproduction buffer becomes full.
[0205]
When simultaneously reproducing the n pieces of real-time data recorded on the information recording medium, the pickup P accessing the area on the information recording medium and the real-time data Di read from the information recording medium are stored. A simultaneous playback model (hereinafter, referred to as an "n-simultaneous playback model") including a playback buffer RBi for performing the decoding and a decoding module DMi for decoding the real-time data Di stored in the playback buffer RBi is used. In this case, the following operation may be performed in steps S712, S715, S713, and S714 shown in FIG.
[0206]
Steps S712 and S715: The optical disk drive 531 executes a reproducing operation Ri for reading out the real-time data Di from the area Ai in which the real-time data Di is recorded in accordance with a reproduction instruction from the data reproducing unit 506.
[0207]
Steps S713 and S714: The playback switching means 515 determines whether or not the playback buffer RBi is full during the execution of the playback operation Ri. If it is determined that the playback buffer RBi is full, playback is performed. The operation Ri is switched to the reproduction operation Rj (i ≠ j), and when it is determined that the reproduction buffer RBi is not full, the reproduction operation Ri is continued.
[0208]
Here, each of the at least one recording area allocated as the area Ai for recording the real-time data Di can fill the reproduction buffer RBi with at most one access operation and at most two reproduction operations. It is configured to satisfy the simultaneous reproduction condition that it can be performed.
[0209]
For example, the simultaneous reproduction condition can be satisfied by each of the at least one recording area allocated as the area Ai for recording the real-time data Di having a size of Y (or Yi) or more.
[0210]
The minimum size Y of the recording area and the size B of the reproduction buffer RWi are obtained according to the following equation.
[0211]
Y = 2 × n × Ta × Vd × Vt ÷ (Vt−n × Vd)
B = (2 × n × Ta + (n−1) × Y / Vt) × Vd
Ta indicates an access time required for the pickup P to access between an innermost area and an outermost area of the information recording medium.
[0212]
Vt indicates a data transfer rate between the pickup P and the reproduction buffer RBi.
[0213]
Vd indicates the data transfer rate between the decoding module DMi and the reproduction buffer RBi for all i.
[0214]
Alternatively, the minimum size Yi of the recording area and the size Bi of the reproduction buffer RWi may be obtained according to the following equation.
[0215]
Yi = (2 × n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)}
Bi = {2 × n × Ta + (Y1 + Y2 +... + Yn)} Vt−Yi ÷ Vt｝ Vdi
Vdi indicates a data transfer rate between the decoding module DMi and the reproduction buffer RBi.
[0216]
Alternatively, the minimum size Yi of the recording area and the size Bi of the reproduction buffer RWi may be obtained in accordance with the following formula in consideration of the estimation of the access time.
[0217]
Yi = {2 × (T1 +... + Tn) × Vt × Vdi｝ ÷ ｛Vt− (Vd1 + Vd2 +... + Vdn)}
Bi = {2 × (T1 +... + Tn) + (Y1 + Y2 +... + Yn)} Vt−Yi ÷ Vt｝ Vdi
Ti indicates the first access time or the second access time. The first access time refers to an access time required for the pickup P to access the area Aj for recording the real-time data Dj from the area Ai for recording the real-time data Di. The second access time refers to an access time required to access another one from at least one of the recording areas allocated as the area Ai for recording the real-time data Di.
[0218]
Note that i is an arbitrary integer of 1 or more and n or less, and n is an arbitrary integer of 2 or more indicating the number of a plurality of real-time data to be simultaneously recorded.
[0219]
Note that the above-described conditions for simultaneous reproduction can be applied to the case where the transfer rates of the real-time data are the same (that is, the case where Vd1 = Vd2 =... = Vdn).
[0220]
FIG. 31 is a diagram showing conditions of simultaneous reproduction for a variable-size recording area. Each reproduction buffer can continuously transfer data to a decoder without causing an underflow. A predetermined threshold value in the buffer is determined as a value for determining that the buffer is full, and if the value exceeds this value, it is determined that the buffer is full.
[0221]
When the conditional expression for simultaneous reproduction is obtained from FIG. 31, it becomes the same expression as the corresponding simultaneous recording.
[0222]
FIG. 32 is a diagram illustrating a layout of a simultaneous-size access area and a fixed-size recording area on a disc when data recorded in the recording area described in the third embodiment is simultaneously reproduced.
[0223]
FIG. 33 is a flowchart showing a simultaneous reproduction method corresponding to the simultaneous recording method when the recording rate of the data to be recorded is fixed. The difference from the recording is that the recording buffer is a reproduction buffer and the condition for switching from one reproduction to the other reproduction is different. That is, in the simultaneous reproduction, the reproduction operation is continued until the end of the area in which the data to be reproduced is recorded, and the reproduction operation is switched at the end.
[0224]
When simultaneously reproducing the n pieces of real-time data recorded on the information recording medium, the above-described “n-simultaneous reproduction model” is used. In this case, the following operation may be performed in steps S712, S715, S717, and S718 shown in FIG.
[0225]
Steps S712 and S715: The optical disk drive 531 executes a reproducing operation Ri for reading out the real-time data Di from the area Ai in which the real-time data Di is recorded in accordance with a reproduction instruction from the data reproducing unit 506.
[0226]
Steps S717 and S718: The playback switching means 505 determines whether or not the real-time data Di has been read to the end of one of the at least one recording area allocated as the area Ai in the playback operation Ri. When it is determined that the real-time data Di has been read to the end of the recording area, the reproducing operation Ri is switched to the reproducing operation Rj (i ≠ j), and the real-time data Di is read to the end of the recording area. If it is determined that the reproduction has not been performed, the reproduction operation Ri is continued.
[0227]
Here, each of the at least one area allocated as the area Ai for recording the real-time data Di is obtained by switching the real-time data Di accumulated in the reproduction buffer RBi during a single reproduction operation when the reproduction operation is switched. It is configured to satisfy the simultaneous reproduction condition that it can be consumed between n access operations and (n-1) reproduction operations.
[0228]
For example, when each of at least one recording area allocated as the area Ai for recording the real-time data Di has the size of Yi, the simultaneous reproduction condition can be satisfied.
[0229]
The size Yi of the recording area and the size Bi of the reproduction buffer RWi are obtained according to the following equations.
[0230]
Yi = (n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)}
Bi = {n * Ta + (Y1 + Y2 +... + Yn)} Vt-Yi {Vt} Vdi
Alternatively, in consideration of the estimation of the access time, the size Yi of the recording area and the size Bi of the reproduction buffer RWi may be obtained according to the following formula.
[0231]
Yi = {(T1 +... + Tn) × Vt × Vdi {Vt− (Vd1 + Vd2 +... + Vdn)}
Bi = {(T1 +... + Tn) + (Y1 + Y2 +... + Yn)} Vt-Yi {Vt} Vdi
Ti indicates an access time required for the pickup P to access the area Aj for recording the real-time data Dj from the area Ai for recording the real-time data Di.
[0232]
Note that i is an arbitrary integer of 1 or more and n or less, and n is an arbitrary integer of 2 or more indicating the number of a plurality of real-time data to be reproduced simultaneously.
[0233]
Note that the above-described conditions for simultaneous reproduction can be applied to the case where the transfer rates of the real-time data are the same (that is, the case where Vd1 = Vd2 =... = Vdn).
[0234]
FIG. 34 is a diagram showing conditions of simultaneous reproduction for a fixed-size recording area. Each reproduction buffer can continuously transfer data to the decoder without underflow, and reproduction at the end of the recording area. Simultaneous playback is performed while switching the operation.
[0235]
When the conditional expression for simultaneous reproduction is obtained from FIG. 34, it becomes the same expression as the corresponding simultaneous recording.
[0236]
The configuration of the information recording / reproducing apparatus is the same as the configuration of the information recording / reproducing apparatus shown in FIG. The reproduction switching means 515 controls the switching of the reproduction operation of the real-time data, and realizes continuous data reproduction while buffering the data to be reproduced using the reproduction buffer memories A and B (512 and 513).
[0237]
FIG. 35 shows a procedure of a method for editing real-time data. Such a method can be stored in a memory in the system control unit 501 in the form of a program, for example. Such a program can be executed by a microcomputer in the system control unit 501, for example.
[0238]
The file structure processing means 504 reproduces the file structure in order to obtain where the data of the file is recorded (step S721).
[0239]
The in-point and out-point setting means 514 specifies the range of the area to be reproduced in the area where the real-time data is recorded by using the in-point and the out-point (step S722).
[0240]
The unallocated area search unit 503 determines whether or not the condition for simultaneous reproduction is satisfied when reproducing the area specified by the in point and the out point (step S723). The determination result is presented to the user by an arbitrary method (for example, displayed on a display). If the conditions for simultaneous playback are satisfied, the user can see that continuous playback is possible. If the conditions for simultaneous playback are not satisfied, the user must change the editing point to enable continuous playback, or move the data of the part that causes discontinuity to enable continuous playback. Can be.
[0241]
Note that the conditions for simultaneous reproduction can be any of the conditions for simultaneous reproduction described above. By permitting the editing of the real-time data only when the conditions for simultaneous reproduction are satisfied, it is possible to guarantee that a plurality of real-time data including the edited real-time data are reproduced simultaneously.
[0242]
Note that the above-described “n-simultaneous reproduction model” is used to ensure that n pieces of real-time data including edited real-time data are reproduced simultaneously. In this case, the following operation may be performed in steps S722 and S723 shown in FIG.
[0243]
Step S722: The in point out point setting means 514 selects at least one area from the area Ai in which the real-time data Di is recorded. The at least one selected area indicates a range of an area that the user wants to reproduce. Here, the method of selecting at least one region does not matter. For example, by specifying the range of the area Ai using the in point and the out point, at least one area can be selected from the area Ai.
[0244]
Step S723: The unallocated area search unit 503 determines whether or not each of the at least one area selected in step S722 is configured to satisfy the simultaneous reproduction condition. Editing of the real-time data Di is permitted only when the determination result is “Yes”.
[0245]
Note that i is an arbitrary integer of 1 or more and n or less, and n is an arbitrary integer of 2 or more indicating the number of a plurality of real-time data to be reproduced simultaneously.
[0246]
FIG. 18 is a diagram showing the arrangement of data obtained by cutting and editing video data and audio data recorded at the same time and access at the time of reproduction. In this example, a recording area 155 of audio data corresponding to the recording area 151 of video data is arranged on the inner side, and a recording area 156 of audio data corresponding to the recording area 155 of video data is arranged on the outer side. . In cut editing, an in point and an out point are specified for video and audio, respectively, and a video recording area 171 and an audio recording area 172 are specified to be reproduced. As an access operation, after reproducing the recording area 171 (R21), the recording area 172 is reproduced after the access time Tf (R22), and after the access time Ta, the recording area 155 is reproduced. A part of the data (recording areas 171 and 172) recorded on the inner side is reproduced, and a condition is determined as to whether the recording areas 155 and 156 of the audio and video data arranged on the outer side can be reproduced continuously. Think. If the data size of the real-time data recorded on the disc is larger than the product of the time from the start of reading the data to the time when the next recording area of the data is accessed and the data rate of the data, the data is reproduced. The buffer is never empty. From this, regarding video data,
YV ÷ VdV => (Ta + YV ÷ Vt + (Tf + YA ÷ Vt) + (a + b) × Ts)
Regarding audio data,
YA ÷ VdA => (Ta + YV ÷ Vt + (Tf + YA ÷ Vt) + (a + b) × Ts)
Therefore, the conditions for simultaneous playback are:
YV ÷ VdV => (Ta + Tf + (a + b) × Ts) × Vt ÷ (Vt−VdV−VdA)
YA {VdA => (Ta + Tf + (a + b) × Ts) × Vt} (Vt−VdV−VdA)
Since the time to play audio data and the time to play video data are the same,
YA ÷ VdA = YV ÷ VdV
The required buffer size is
BV => (Ta + Tf + (a + b) × Ts + YA ÷ Vt) × VdV
BA => (Ta + Tf + (a + b) × Ts + YV ÷ Vt) × VdA
Here, YV, YA: minimum size of the recording areas 171 and 172, VdV: data rate of video data, VdA: data rate of audio data, Tf: access time to the recording areas 171 to 172, Ta: from the recording area 172 Access time to the recording area 155, a, b: number of ECC blocks to be skipped in the recording areas 171 and 172, Ts: time to read one ECC block, Vt: data read rate from the disk, BV: video data Required for reproduction of audio data, BA: size of reproduction buffer required for audio data.
[0247]
Since the video data and the audio data have a correlation, the video data and the audio data are rarely recorded at random, but are recorded near each other. For example, it may be recorded at a distance within a fine seek or may be recorded in an adjacent area. When recording is performed at a distance within the fine seek, Tf is about 100 msec, and when Ta is set to 1 sec, the condition for simultaneous reproduction is greatly eased as compared with the case where Tf is regarded as Ta.
[0248]
Next, conditions for simultaneous reproduction in a case where an in point and an out point are set in two sets of recording areas will be described. FIG. 19 is a diagram showing the arrangement and access of data obtained by cutting and editing two sets of simultaneously recorded video data and audio data. The recording areas 151 and 153 are the same as those described above. In this example, an in point and an out point are set in the recording area 156 of the audio data corresponding to the recording area 155 of the video data on the outer peripheral side. In addition to 171 and 172, recording areas 173 and 174 are reproduced. The access operation is performed in the order of R23, Tf1, R24, Ta, R25, Tf2, and R26. The reason for starting reading from audio data instead of starting from video data is that the time until image output becomes possible is shortened. Since the video data has a higher data rate than the audio data, the image cannot be output unless the recording area 171 is read and the recording area 172 is accessed. Conversely, if the data is read from the audio data, the recording area 172 having a small data size is read, and after accessing the recording area 171 at Tf1, an image can be output. On the other hand, considering recording, if recording is performed from video data, the required buffer size is reduced. Although not shown, the recording area of the audio data is arranged in front of the recording area of the video data with respect to the reproduction direction, and after recording the video data, the corresponding audio data is recorded, so that the audio data is recorded. The buffer size does not increase and the buffer size during reproduction can be reduced.
[0249]
Consider a condition as to whether audio-video data can be reproduced continuously. When the video condition is obtained during the access operation from R23 to Tf2,
YV ÷ VdV => (TcA1 + b × Ts + Tf1 + TcV1 + a × Ts + Ta + TcA2 + b × Ts + Tf2)
YV = TcV1 × Vt
The conditions regarding audio during the access operation from R23 to Ta are as follows:
YV ÷ VdA => (TcA1 + b × Ts + Tf1 + TcV1 + a × Ts + Ta)
YA = TcA1 × Vt
Therefore,
YV ÷ VdV => (TcA1 + 2 × b × Ts + Tf1 + a × Ts + Ta + TcA2 + Tf2) × Vt ÷ (Vt−VdV)
YA {VdA => (b × Ts + Tf1 + TcV1 + a × Ts + Ta) × Vt} (Vt−VdA)
YA and YV can be obtained from these two equations. The required buffer size is
BV => (TcA1 + 2 × b × Ts + Tf1 + a × Ts + Ta + TcA2 + Tf2) × VdV
BA => (TcV1 + a × Ts + b × Ts + Tf1 + Ta) × VdA
Here, YV: the minimum size of the recording area of the video data obtained by adding the recording areas 171 and 173, YA: the minimum size of the recording area of the audio data obtained by adding the recording areas 172 and 174, VdV: the data rate of the video data, VdA : Data rate of audio data, TcA1, TcV1, TcA2, TcV2: Net read time for reading data from recording areas 172, 171, 174, 173, Tf1: Access time from recording areas 172 to 171, Ta: Recording area 171 , Access time to the recording area 174, Tf2: access time from the recording area 174 to the recording area 173, a: number of ECC blocks to be skipped in each of the recording areas 171 and 173, b: recording areas 172 and 174, respectively Of the ECC block to be skipped in the area of , Ts: time for reading one ECC block, Vt: the data readout rate from the disk, BV: size of the reproducing buffers required for the video data, BA: the size of the reproduction buffer required for audio data. Note that when there are a defective ECC blocks in the recording area, the time for reading data from the recording area is, as described in the description of skip recording, equal to the net reading time for reading valid data in the recording area. XTs is the time added.
[0250]
As described above, if the audio data is read, the reproduction start time of the video data and the audio data is shortened.
[0251]
Next, an example in which a continuous recording area is cut and edited in units of a plurality of audio data and video data will be described with reference to FIG. Each recording area of audio data and video data is determined not by the full seek time but by a short-distance access condition such as a fine seek. If access from the innermost circumference to the outermost circumference is required for cut editing, full seek access becomes possible after reproducing a plurality of recording areas. In FIG. 20, recording areas for video data and recording areas for audio data are alternately arranged from the inner circumference side. The recording areas of the video data are 180, 182 and 184, and the recording areas of the audio data are 181, 183 and 185. However, although not shown, a plurality of recording areas may exist between the recording areas 183 and 184. The in points of the video data and the audio data are set in the recording areas 180 and 181, respectively, and the out points are set in the recording areas 184 and 185, respectively. In FIG. 20A, a condition is considered in which simultaneous reproduction of audio data and video data is continued even if Ta is accessed after reproducing the recording areas 186, 187, 182, 183 to 188, 189. . FIG. 20B schematically shows the access operation. Read R31 of the recording area 186, access Tf1, read R32 of the recording area 187, access Tfi, read RV of the recording area 182, access Tfj, read RA of the recording area 183, access Tf2, read R33 of the recording area 188, access Tf3, Consider the read R34 of the recording area 189 and the access Ta. Here, it is assumed that there are a plurality of recording areas between the recording areas 183 and 184, and the reading of the recording areas 182 and 183 is to be repeated P times, from the video recording area to the audio recording area. Is Tfj, and the access from the audio recording area to the video recording area is Tfi. Tfj and Tfi are represented using the subscripts i and j to be access times corresponding to the arrangement of the recording areas existing between the recording areas 183 and 184. The net data read time from the disk corresponding to the read of R31, R32, RV, RA, R33, and R34 is TinV, TinA, TcV, TcA, TouV, and TouA. Let a and b be the numbers of ECC blocks to be skipped. Conditions for video data
YV ÷ VdV => (TinV + Tf1 + TinA + P × (TcV + Tfj + Tfi + TcA) + Tf2 + ToutV + Tf3 + TuotA) + Ta + (P + 2) × (a + b) × Ts)
YV = (TinV + P × TcV + ToutV) × Vt
It becomes.
For audio data,
YA ÷ VdA => (TinV + Tf1 + TinA + P × (TcV + Tfj + Tfi + TcA) + Tf2 + ToutV + Tf3 + TuotA) + Ta + (P + 2) × (a + b) × Ts)
YA = (TinA + P × TcA + ToutA) × Vt
Therefore, the condition for simultaneous reproduction of video data and audio data is as follows: YV ÷ VdV => (Tf1 + Tf2 + Tf3 + P × (Tfj + Tfi) + Ta + (P + 2) × (a + b) × Ts) × Vt ÷ (Vt−VdV−VdA)
YA ÷ VdA => (Tf1 + Tf2 + Tf3 + P × (Tfj + Tfi) + Ta + (P + 2) × (a + b) × Ts) × VtＴ (Vt−VdV−VdA)
It becomes.
YA こ と VdA = YV ÷ VdV because the time for reproducing the data of YA and YV is equal. Similarly, YcV ÷ VdV = YcA ÷ YdA and YcV = TcV because the time for reproducing the data of YcV and YcA is equal. × Vt, YcA = TcA × Vt
The required buffer size is
BV => ((Tf1 + TinA) + Tf2 + (Tf3 + ToutA) + P × (Tfj + Tfi + TcA) + Ta + (P + 2) × (a + b) × Ts) × VdV
BA => (TinV + Tf1 + Tf2 + (ToutV + Tf3) + P × (TcV + Tfj + Tfi) + Ta + (P + 2) × (a + b) × Ts) × VdA
Here, P: the number of continuous areas (P> = 0) that are read continuously in perfect form within the cut, TinV: the disk read time from the in point in the video data recording area, ToutV: the video data Disk reading time from the in point in the recording area of audio data, TinA: disk reading time from the in point in the recording area of audio data, ToutA: disk reading time to the out point in the recording area of the audio data, YV: reproduction Total size of video data, YA: Total size of audio data to be reproduced, VdV: Data rate of video data, VdA: Data rate of audio data, Tf1: Access time from recording areas 186 to 187, Tf2: From recording area 183 Access time to 188, Tf3: recording area 188 to 18 , Ta: access time from the recording area 189 to the next recording area, a: number of ECC blocks to be skipped in each of the recording areas 186, 182, 188, b: recording areas 187, 183, 189 Number of ECC blocks to be skipped in each area, Ts: time for reading one ECC block, Vt: data read rate from disk, YcV: data size of video data recording area 182, YcA: audio data recording area 183, data size of 183, BV: size of a reproduction buffer required for video data, and BA: size of a reproduction buffer required for audio data.
[0252]
Since P can be obtained from the above simultaneous playback conditions, if the minimum size of each of the audio and video recording areas is determined in consideration of the short-distance access time, video data recording is performed as a unit required for cut editing. The number of areas and audio data recording areas can be obtained. Therefore, by recording the audio data and the video data in an area smaller than YV and YA determined by the expression of the simultaneous playback condition while interleaving the audio data and the video data, the playback area of the audio data at the in point and the out point of the cut editing and the video are recorded. The access time to the data reproduction area can be reduced.
[0253]
In the example of FIG. 20, the case where audio data and video data are recorded separately is considered, but if audio data and video data are recorded in a continuous area, access between audio data and video data becomes unnecessary. It can be seen that the conditions for simultaneous reproduction are relaxed.
[0254]
(Embodiment 5)
In the fourth embodiment, an example in which cut editing is performed by designating the in point and the out point has been described. In the present embodiment, a search for finding the in point and the out point will be described. A commercial VTR has a function of outputting a sound for the searched image even when performing a high-speed search. This is because, by distinguishing the sound that has been advanced earlier, it is possible to distinguish between a scene change, a narration, and music, which is useful for finding the in point and the out point. Therefore, in the present embodiment, an example will be described in which audio data and video data are recorded in different areas, and an m-times speed image search is performed on a disc while audio is output quickly. In the case of a search with sound, two real-time data, ie, m-times speed audio data and intermittently reproduced video data, are reproduced simultaneously. However, as for video data, if there is no more data in the reproduction buffer due to intermittent reproduction, the same video can be continuously output. That is, in the case of video, video data is selectively read from the recording area of video data, and in the case of audio, the entire recording area of audio data is read and the data stored in the audio playback buffer is read. Are transferred to the decoder at a rate m times the data rate of the audio.
[0255]
FIG. 21 is a diagram showing access when performing a search while reproducing audio data at high speed. The recording areas for video data are 190 and 192, and the recording areas for audio data are 191 and 193. Since the audio and video data at the same time have a correlation, they are arranged close to each other, but if cut editing or the like is performed, the distance between the audio data and the video data may be different. The access times are Tf1 and Tf2. In the access in the video data recording area 190, predetermined video data is read out (Rf) while performing a small access (Tfj) as shown in the figure. When reading data from five locations, data is read from the recording areas 194, 195, 196, 197, 198. After the access time (Tf1) to the audio recording area, the recording area 191 for the audio data is read (RA), and then the recording area 192 for the next video data is accessed (Tf2).
[0256]
FIG. 36 is a flowchart showing a search method with sound. Playback of video data is shown as playback A, and playback of audio data is shown as playback B. First, the video data is partially read from the area where the video data is recorded (step S732). At this time, the read video data is the compressed video data constituting one frame. Next, an area where the next video data is recorded is accessed according to the double speed number to be searched. For example, in FIG. 21, access is made from the areas 194 to 195 (step S733). Steps S732 and S733 are repeated n times (step S731). If the video data forming the n video frames has been read, the area where the audio data is recorded is accessed next (step S734). Next, audio data is read from the recording area by a predetermined size (step S735). Next, the area where the video data is recorded is accessed (step S736). As the sound search method, steps S731, S732, S733, S734, S735, and S736 are repeated.
[0257]
As described above, video data is read out intermittently from a predetermined area, all audio data is read out from the area where the corresponding audio data is recorded, and the video data is dropped, that is, the same frame is repeatedly output. While the frame is updated and audio data is supplied to the decoder according to the double speed of the search, a search with sound is realized.
[0258]
FIG. 37 is a diagram showing conditions for simultaneous reproduction in a search with sound. Data is accumulated in the reproduction buffer A every time the video data is reproduced. That is, at the time, t60-t61, t62-t63, t64-t65, t66-t67, t68-t69, data is read from the areas 194, 195, 196, 197, 198, respectively, and accumulated in the reproduction buffer A. It shows the appearance. The timing at which the video data is transferred from the reproduction buffer A to the decoder A is not shown, but the video data read according to the double speed of the search is transferred to the decoder. Note that t72 indicates the time immediately after the access of Tf2, and since t60 to t72 is one cycle, the video data stored in the reproduction buffer A is read from the reproduction buffer A when the next video data is read after the access of Tf2. Deleted. Further, the data in the reproduction buffer B repeats Rf and Tfj, and between Tf1 and Tf2, the audio data is transferred from the reproduction buffer B to the decoder B at the double speed of the search at the double speed. Data is consumed. Also, during a period in which data is read from the audio recording area by RA, the audio data is transferred to the decoder B at the double speed of the search, and the read audio data is transferred to the playback buffer B. The data in increases. Using this figure, a conditional expression for simultaneous reproduction will be derived below.
[0259]
Assuming that the intermittent reading of video data and the reading of audio data are one cycle (Tp), Tp = TcV + TcA + Tf2, where TcV is a time required for reproducing video data within one cycle, and TcV = n × T1V + (N-1) × Tfj + Tf1, where n: number of frames output in one cycle, Y1V: recording size of one frame of video data, T1V: time for reading one frame of video data from the disk, Vt: disk Is the data read rate. Next, TcA is a time required for reproducing audio data within one cycle, and TcA = YAＹVt, where YA is a continuous recording area in which audio data is recorded.
[0260]
It is assumed that video data is compressed in frame units like DV (digital video) used in digital video cameras.
[0261]
Therefore, the condition of simultaneous reproduction in which m-times audio data is not interrupted is that the normal reproduction rate of audio data is VdA.
YA ÷ (VdA × m) => n × T1V + (n−1) × Tfj + Tf1 + TcA + Tf2
Assuming YA = TcA × Vt,
YA {(VdA × m) => {n × T1V + (n−1) × Tfj + Tf1 + Tf2} × Vt} (Vt−m × VdA)
Further, x is the number of image frames per second at m-times speed, and x = n ÷ (YA ÷ (VdA × m)), YA ÷ (VdA × m) => n ÷ x,
Therefore,
m = <YA × Vt {VdA × (Vt × (n × T1V + (n−1) × Tfj + Tf1 + Tf2) + YA}
However, (Vt−m × VdA)> 0
Therefore, the value of m is obtained by giving n. Further, the number of frames x per second can be obtained.
[0262]
Thus, in order to realize a search with sound, the minimum size of the recording area of audio data can be determined under the above conditions.
[0263]
In the audio data, two channels of L channel and R channel may be recorded in one recording area, or four channels of L1 channel, R1 channel, L2 channel, and R2 channel may be recorded in one continuous area. Is also good. In this case, the data rate of the audio data is proportional to the number of channels.
[0264]
In general, audio and video data mixed and encoded, such as MPEG data and DV data, can only be searched with sound at a speed up to about twice as fast. According to the present invention, when these data are recorded, audio data having the same content is separately recorded in a recording area having a size equal to or larger than the size determined by the above-described conditions, so that a search with sound can be performed even at a double speed or higher. In this case, since the audio having the same content is recorded in a different area from the main data, the reliability of the audio data can be improved.
[0265]
As shown in FIGS. 21A and 21B, audio data and video data may be interleaved and recorded, or may be recorded continuously for each data. In the case of interleaved recording as shown in FIG. 21A, the access time between the audio recording area and the video recording area is shortened, so that there is an advantage that the condition of simultaneous reproduction is eased. When the number is large, the data size required to reproduce the audio data continuously at one time increases, and the size of the recording area of the interleaved audio and the size of the recording area of the video data corresponding thereto increase. In the case where the audio data and the video data shown in FIG. 21B are recorded in separate areas, the audio data can be recorded in a continuous long area. Since it can be large, it is possible to cope with a case where the double speed number of the search is large.
[0266]
The audio data recorded in another area may be compressed audio. In this case, since the data rate is reduced, the search speed with sound can be further increased.
[0267]
Note that the video data may be read in units of j frames larger than one. In this case, Y1V is the data size of j frames, and n is the number of frames output in one cycle × j. In the case of MPEG data, it may be in GOP units.
[0268]
Further, when one piece of video data and k pieces of audio data are recorded in different areas, the simultaneous reproduction model includes a pickup P that accesses an area on the information recording medium and a read-out from the information recording medium. Reproduction buffer RBv for storing the video data Dv thus obtained, a decoding module DMv for decoding the video data Dv stored in the reproduction buffer RBv, and a reproduction buffer RBi for storing the audio data Di read from the information recording medium. And a decoding module DMi for decoding the video data Di stored in the playback buffer RBi, and performing a playback operation Rv for partially reading the video data Dv from the area Av in which the video data Dv is recorded ( S732 and S733) and the video data Dv is intermittent from n places in the region Av. After the reproduction, the recording area Ai is accessed to switch the reproduction operation Rv to the reproduction operation Ri (S734). Although not shown, the area Ai in which the audio data Di is recorded (i−1) times (not shown). And reading the audio data Di from the area Ai i times, and reading the data amount determined by the simultaneous playback condition from each area Ai, and then accessing the recording area Av to perform the playback operation Ri. (S736), and (n-1) times of access and n reproduction operations, access from the region Av to the region Ai, and (k-1) times of the region Ai in the region Av Between the area Ai, the data read from the area Ai (k−1) times, and the access from the area Ai to the area Av in the reproduction buffer DMi. The simultaneous playback condition that the audio data Di can be read out by one playback operation and the audio data can be transferred from the playback buffer RBi to the decoding module DMi at m times speed, where m is the double speed of the search. Where i, k, and n are any integers.
[0269]
In this case as well, the condition that audio data is not interrupted is
YA ÷ (VdA × m) => n × T1V + (n−1) × Tfj + Tf1 + Tf2 + (k−1) × Tfi + k × TcA
Here, Tfi is an access time between the areas Ai in which the audio data Di is recorded. From YA = TcA ÷ Vt, the conditions for simultaneous playback are:
YA ÷ (VdA × m) => {n × T1V + (n−1) × Tfj + Tf1 + Tf2 + (k−1) × Tfi} × Vt ÷ (Vt−k × m × VdA)
It becomes.
[0270]
(Embodiment 6)
In the present embodiment, conditions for enabling simultaneous reproduction after AV split editing will be described with reference to three specific examples in FIGS. AV split editing refers to independently editing audio data and video data. For example, rather than switching video and audio at the same time at the transition of the video scene, switching the audio ahead in advance several seconds before the transition of the video scene can anticipate the switching of the video scene. Therefore, there is an effect that switching between video scenes reduces discomfort.
[0271]
FIG. 22 is a diagram showing an arrangement of data on a disk and an access operation at the time of reproduction in a case where audio data and video data are separately encoded and AV split editing is performed on disks recorded in different areas. is there. FIG. 22A shows the data arrangement. It is assumed that video data and audio data are recorded alternately in advance. The recording area of the video data is 221 223 224 233 235 236 237 239, and the recording area of the audio data is 220 230 231 232 234 227 229, and 38. Assume that recording areas 232 and 235 are farther apart by editing. Although not shown, it is assumed that there are (P-1) video data recording areas and audio data recording areas between the recording areas 220 and 223. This is because it is necessary to accumulate predetermined data in the reproduction buffer before the next recording area is accessed at the out point, so that it is necessary to determine how much recording area is to be reproduced in advance. The out point of the video data is set in the recording area 233, and the out point of the audio data at the same time is within the recording area 232. However, in the AV split editing, the video and audio out points are set independently of each other, and the audio out point is generally set before the video, and is set in the recording area 230 in FIG. . Although not shown, between the recording areas 231 and 233, there are (Q-1) video data recording areas and audio data recording areas between the recording areas 231 and 233 so that the difference between the video and audio out points can be increased. It is assumed that On the other hand, the in point of the video is set in the recording area 237, and the in point of the audio at the same time is in the recording area 229, but is set in the recording area 234. This is because the audio in point is set so that the difference between the playback times of the video and audio out points is equal to the difference between the playback times of the video and audio in points. Similarly, although not shown, it is assumed that there are (Q-1) video data recording areas and audio data recording areas between the recording areas 227 and 237.
[0272]
FIG. 22B shows an access operation for reproducing each recording area. Access to the recording area 220 is performed by Tfi, reading R50 of the recording area 220, access Tfj to the recording area 221 and reading R51 of the recording area 221 are performed. When the access to these areas is repeated P times, the access Tfj to the video recording area, the reading of the video recording area, the access Tfi to the audio recording area, and the reading of these recording areas are repeated P times in one cycle. It will be. Next, data is read one after another in the order of access Tf1, read R52 of the recording area 222, access Tf2, read R53 of the recording area 223, and access Tfk. The reading R54 of the video data recording area 224 is performed next, and the reading from the video recording area is performed Q times including the subsequent video recording area. The number of times Q is determined according to the difference between the reproduction times at the out point of audio and video. The access between the video recording areas is defined as Tfk. With the access to the next recording area 225 set to Tf3, the reading R55 of the recording area 225 is performed, and then the access Ta is performed to read data from the audio in point. Next, the read R56 of the recording area 226, the access Tfm, and the read R57 of the audio data recording area 227 are performed next, but it is assumed that reading from the audio recording area is performed Q times including the subsequent audio recording area. I have. This corresponds to the out point, and the number of times Q is determined according to the difference between the playback times at the in point of audio and video. The access between the audio recording areas is defined as Tfm. With access to the next recording area 228 being Tf4, readout R58 of the recording area 228 is performed, and then access Tf5 and data readout R59 from the recording area 229 are performed.
[0273]
The net read times of the data read R50 to R59 are TcV, TcA, TcV, ToutA, TcV, ToutV, TinA, TcA, TinV, and TcA, respectively. In addition, a: the number of ECC blocks to be skipped in the video data recording area, and b: the number of ECC blocks to be skipped in the audio data recording area.
[0274]
The conditions for simultaneous playback of video data are as follows:
YV ÷ VdV => P × (TcA + (a + b) × Ts + TcV + Tfj + Tfi) + Tf1 + ToutA + (a + b) × Ts + Tf2 + TcV + Q × (TcV + a × Ts + Tfk) + Tf3 + ToutV + a × Ts + Ta + TinA + b × Ts + Q × (TcA + b × Ts + Tfm) + Tf4 + TcA + b × Ts + Tf5 + TinV + a × Ts
YV = (P + 1 + Q) × YcV + ToutV × Vt + TinV × Vt
And the conditions for simultaneous playback of audio data are:
YA / VdA => P × (TcA + (a + b) × Ts + TcV + Tfj + Tfi) + Tf1 + ToutA + (a + b) × Ts + Tf2 + TcV + Q × (TcV + a × Ts + Tfk) + Tf3 + ToutV + a × Ts + Ta + TinA + b × Ts + Q × (TcA + b × Ts + Tfm) + Tf4 + TcA + b × Ts + Tf5 + TinV + a × Ts
YA = (P + 1 + Q) × YcA + (ToutA + TinA) × Vt
From
YV ÷ VdV => (ToutA + TinA- (ToutV + TinV) × VdA ÷ VdV + (P + Q + 3) × (a + b) × Ts + P × (Tfi + Tfj) + Q × (Tfk + Tfm) + Tf1 + Tf2 + Tf3 + Tf-VtV + TfV + TfV + TfVdVtV + TfV + TfVdV + TfVdVtV + TfV + TfVdVtV + TfVdVtVa
YV ÷ VdV => (ToutV + TinV− (ToutA + TinA) × VdV / VdA + (P + Q + 3) × (a + b) × Ts + P × (Tfi + Tfj) + Q × (Tfk + Tfm) + Tf1 + Tf2 + Tf3 + Tf + Tf + Tf + TfVdV + TfV + TfV + TfV + TfV + TfV + TfV + TfV + TfV + TfV + TfV + VfV + TfV + VfV + VfV + TfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + VfV + TfVd
It becomes. The conditions for simultaneous playback of audio up to the audio in point are as follows:
YA ′ / VdA => P × (TcV + (a + b) × Ts + TcA + Tfj + Tfi) + Tf1 + TcV + (a + b) × Ts + Tf2 + ToutA + Q × (TcV + a × Ts + Tfk) + Tf3 + ToutV + a × T ×
here,
YA ′ = P × YcA + ToutA × Vt
YA '÷ VdA = (P + Q + 2) × a × Ts + (P + 1) × b × Ts + P × (Tfj + Tfi) + Q × Tfk + Tf1 + Tf2 + Tf3 + Ta + TspV) ÷ Vt ÷ (Vt-VdV-VdA)
However, TspV = (Q + 1) × TcV + ToutV−ToutA × VdV ÷ VdA
It becomes. In addition,
It is assumed that YA ÷ VdA = YV ÷ VdV, TcV × Vt = YcV, TcA × Vt = YcA, and YcV ÷ VdV = YcA と し VdA.
From the above three conditional expressions, the size required for the video and audio recording areas can be obtained. Note that YA '/ VdA represents the playback time of audio data read from the disk before Ta access, and is an index of how much audio data should be recorded before the out point of AV split editing. .
[0275]
If the reading of the video data is switched to the reading of the audio data on the way to the out point, a full seek occurs in accessing the recording area from the video data to the audio data, so that the recording is performed before the split point. The size of the data to be increased increases. In the split editing in which the audio switches prior to the video as in the invention described in the present embodiment, the video data is read up to the out point, and access is made to the beginning of the area where the audio data corresponding to the video data is recorded. By reading the audio data after that, the number of full seeks can be reduced. Conversely, in the split editing in which the audio switches prior to the video, the audio data is read to an out point, and the video data is read after accessing the head of the area where the video data corresponding to the audio data is recorded. By doing so, the number of full seeks can be reduced.
[0276]
Next, with reference to FIG. 23, regarding the arrangement of data on the disk and the access operation at the time of reproduction when performing AV split editing on a disk on which data encoded by mixing audio data and video data is recorded. explain. In this example, data encoded by mixing audio data and video data, such as MPEG data or DV data, is referred to as AVM (Audio Video Mix Data). FIG. 23A shows an arrangement of two AVM data arranged on the disk. As shown, the out point and the in point are set for audio and video, respectively. As described above, the difference between the playback times at the out point of the audio and the video is the same as the difference at the in point. Of the recording area of the AIM data # 1, the recording area 201 is read to decode the audio and video data, and the recording area 202 is read to decode only the video data. Of the recording area of the AIM data # 2, the recording area 203 is read to decode only the audio data, and the recording area 204 is read to decode the audio and video data. In the recording areas 202 and 203, only the audio data or the video data is decoded even though all the data is read out, because the AIM data is recorded by mixing the audio data and the video data. This is because reading all the areas requires less time than selectively reading only such data. As described above, focusing on the recording areas 202 and 203, the data becomes the same reproduction time, so that it is necessary to reproduce the two data at the same time.
[0277]
FIG. 23 (b) shows an access operation, in which the recording areas 201 and 202 are successively read out, R41, after the access Ta, the recording area 203 is read out (R42), and subsequently the recording area 204 is read out. It is.
[0278]
Considering the conditions for simultaneous playback of video data in the range from R41 to R42,
YV ÷ VdV => (TcY + (a + b) × Ts + 2Tsp + Ta)
YV = (TcY + Tsp) × Vt × (VdV ÷ Vd)
Therefore,
YV ÷ VdV => ((a + b) × Ts + Tsp + Ta) × Vt ÷ (Vt−Vd) Considering the condition of simultaneous reproduction in the range from R41 to Ta,
YA ÷ VdA => (TcY + a × Ts + Tsp + Ta)
YA = TcY × Vt × (VdA ÷ Vd)
Therefore,
YA {VdA => (a × Ts + Tsp + Ta) × Vt} (Vt−Vd)
Or
YV ÷ VdV => (a × Ts + Tsp × Vt ÷ Vd + Ta) × Vt ÷ (Vt−Vd)
It becomes.
The required buffer size (B) is
B => (Ta + (a + b) × Ts + Tsp) × Vd
The buffer size (B-extraA) for processing audio data is
B-extraA => Tsp × (Vt × (VdA ÷ Vd) −VdA)
Here, Tsp: net data read time of the recording area 202 or 203 during the split period, TcY: net data read time of the recording area 201 for reproducing both audio and video, and a: within the recording areas 201 and 202. The number of defective ECCs to be skipped, b: the number of defective ECCs to be skipped in the recording area 203, Ts: the time for reading the ECC block, Vt: the data read rate from the disk, Vd: the data for outputting AVM data from the buffer to the decoder Rate.
[0279]
In general, in the case of AVM data, split editing is difficult, but by using the present invention, the split time at which split editing is possible and the size of an area in which AVM data is to be recorded before the split point are obtained in advance.
[0280]
Note that if the time for splitting is short, AV split editing can be performed by this method. However, if the time for splitting is long, the recording area 203 becomes long, and the efficiency of extracting audio data from this area deteriorates. The size of the region 201 becomes large and is not practical.
[0281]
Next, a description will be given of a method of AV split editing when the time for splitting becomes long. In this method, instead of extracting audio data from the recording area 203, the same audio data is recorded in another area in advance, and AV split editing is performed by using this audio data. FIG. 24 (a) shows data of audio data mixed with encoded video data and encoded data, and data on the disk when AV split editing is performed on a disk on which audio data of the same content is recorded in another area. It is a figure showing arrangement. As shown, the out point and the in point are set for audio and video, respectively. In particular, the in point of the audio data is set in a recording area 213 recorded in an area different from the AVM data. Of the recording area of the AIM data # 1, the recording area 211 is read to decode the audio and video data, and the recording area 212 is read to decode only the video data. The audio data in the recording area 213 is read, and the recording area 214 is read out of the recording area of the AIM data # 2, and the audio and video data are decoded.
[0282]
FIG. 24B shows an access operation, in which the recording areas 211 and 212 are successively read out, and the recording area 213 is read out after R43 and the access Ta1 (R44), and the recording area is read out after the access Ta2. 214 is read.
[0283]
Considering the conditions for simultaneous playback of video data in the range from R43 to Ta2,
YV ÷ VdV => (TcY + (a + c) × Ts + Tsp + TspA + Ta1 + Ta2)
YV = (TcY + TcV) × Vt × (VdV ÷ Vd)
Therefore,
YV / VdV => ((a + c) × Ts + TspA + Ta1 + Ta2) × Vt ÷ (Vt−Vd)
Considering the conditions for simultaneous playback of audio data in the range from R43 to Ta1,
YA ′ ÷ VdA => (TcY + a × Ts + Tsp + Ta1)
YA ′ = TcY × Vt × (VdA ÷ Vd)
Therefore,
YA ′ ÷ VdA => (a × Ts + Tsp × Vt ÷ Vd + Ta1) × Vt ÷ (Vt−Vd)
The required playback buffer size (B) for AVM data is
B => (Ta1 + TspA + Ta2 + (a + c) × Ts) × Vd
For audio data to be split, the required buffer size (B-extraA) is
B-extraA => TspA × (Vt−VdA)
Here, TspA: the net data read time of the audio data recording area 213 during the split period, a: the number of defective ECCs skipped in the recording areas 211 and 212, c: the number of defective ECCs skipped in the recording area 213 It is.
As described above, even if the time for splitting is long, AV split editing can be performed by using audio data different from AVM data.
[0284]
The audio data may be recorded on two channels, L channel and R channel, or may be recorded on four channels, L1 channel, R1 channel, L2 channel, and R2 channel. In this case, the data rate of the audio data is proportional to the number of channels.
[0285]
【The invention's effect】
In the information recording medium of the present invention, the recording buffer is controlled so as to maintain a state close to empty in order to switch the switching timing of the recording process according to the amount of data stored in the buffer memory. Thus, simultaneous recording can be stably performed even if the pickup cannot record data for a predetermined period. Since the switching timing of the recording process is appropriately switched, simultaneous recording can be realized with a small number of buffer memories. Also, by allocating data so that the area where data is recorded is at least the minimum size considering access twice as many as the number of real-time data, it can be played back on other devices, and playback compatibility is improved. Can be secured.
[0286]
In addition, by setting the optimum simultaneous recording condition by utilizing the difference in the transfer rate of the data to be recorded, data with a low transfer rate can be recorded in a smaller recording area, and the efficiency of use of the disc increases.
[0287]
In addition, by estimating the access between the extents from the access performance of the drive, it is possible to obtain an appropriate minimum extent size.
[0288]
Further, since the conditions for simultaneous recording are similar to the conditions for simultaneous reproduction, it can be used for searching, editing, and the like.
[Brief description of the drawings]
FIG. 1 is a diagram showing conditions for simultaneous recording on an information recording medium according to a first embodiment of the present invention;
FIG. 2 is a diagram showing a model for realizing simultaneous recording;
FIG. 3 is a layout diagram showing access on a disc in the information recording medium according to the first embodiment of the present invention;
FIG. 4 is a diagram showing a switching operation of simultaneous recording in the information recording medium according to the first embodiment of the present invention;
FIG. 5 is a block diagram showing a configuration of an information recording / reproducing apparatus according to the first embodiment of the present invention.
FIG. 6 is a flowchart showing a simultaneous recording method according to the first embodiment of the present invention;
FIG. 7 is a diagram showing a directory structure of recorded data.
FIG. 8 is a diagram showing an operation of skip recording.
FIG. 9 is a diagram showing recording and access operations at the time of simultaneous recording of two real-time data according to the second embodiment of the present invention.
FIG. 10 is a diagram showing a layout of a recording area on a disc according to the second embodiment of the present invention;
FIG. 11 is a diagram showing recording and access operations during simultaneous recording of three real-time data according to the second embodiment of the present invention.
FIG. 12 is a diagram showing recording and access operations during simultaneous recording of two real-time data according to the third embodiment of the present invention.
FIG. 13 is a diagram showing recording and access operations during simultaneous recording of three real-time data according to the third embodiment of the present invention.
FIG. 14 is a diagram showing a breakdown of access time according to the third embodiment of the present invention;
FIG. 15 is a diagram illustrating a relationship between a difference in the number of rotations of a disk and an access time according to the third embodiment of the present invention;
FIG. 16 is a diagram showing a relationship between a radial position and a rotational speed difference of a disk according to the third embodiment of the present invention.
FIG. 17 is a diagram showing a model for realizing simultaneous reproduction according to the fourth embodiment of the present invention;
FIG. 18 is a diagram showing an arrangement of a set of cut-edited video data and audio data and access at the time of reproduction according to the fourth embodiment of the present invention;
FIG. 19 is a diagram showing the arrangement of two sets of cut-edited video data and audio data and access at the time of reproduction according to the fourth embodiment of the present invention.
FIG. 20 is a diagram showing the arrangement of video data and audio data cut and edited in units of a plurality of audio data and video data according to the fourth embodiment of the present invention, and access at the time of reproduction;
FIG. 21 is a diagram showing access when performing a search while reproducing audio data at high speed according to the fifth embodiment of the present invention.
FIG. 22 is a diagram showing the arrangement of audio data and video data after AV split editing and access during reproduction when audio data and video data are recorded in different areas according to the sixth embodiment of the present invention.
FIG. 23 is a diagram showing the arrangement of audio data and video data after AV split editing of AVM data according to the sixth embodiment of the present invention and the access at the time of reproduction;
FIG. 24 is a diagram showing the arrangement of audio data and video data after AV split editing of AVM data using audio data recorded in another area according to the sixth embodiment of the present invention, and access at the time of reproduction;
FIG. 25 is a diagram showing a layout of a recording area for simultaneously recording two real-time data according to the third embodiment of the present invention.
FIG. 26 is a flowchart showing a method for simultaneously recording two real-time data according to the third embodiment of the present invention;
FIG. 27 is a diagram showing an access and a layout of a recording area when recording three real-time data simultaneously according to the second embodiment of the present invention;
FIG. 28 is a diagram showing an access area on a disk and an access time required for a full seek in the area according to the third embodiment of the present invention.
FIG. 29 is a diagram showing a layout of a recording area of variable size and access for simultaneous reproduction on a disc in the information recording medium according to the fourth embodiment of the present invention;
FIG. 30 is a flowchart showing a simultaneous reproduction method for a variable-size recording area according to the fourth embodiment of the present invention;
FIG. 31 is a diagram showing conditions for simultaneous reproduction of a variable-size recording area in the information recording medium according to the fourth embodiment of the present invention.
FIG. 32 is a diagram showing access to a reproduction area on a disc and layout of a fixed-size recording area in simultaneous reproduction according to the fourth embodiment of the present invention.
FIG. 33 is a flowchart showing a simultaneous reproduction method for a fixed-size recording area according to the fourth embodiment of the present invention;
FIG. 34 is a diagram showing conditions for simultaneous reproduction of a fixed-size recording area in the information recording medium according to the fourth embodiment of the present invention.
FIG. 35 is a flowchart showing an editing method according to the fourth embodiment of the present invention.
FIG. 36 is a flowchart showing a search method with sound according to the fifth embodiment of the present invention.
FIG. 37 is a diagram showing conditions for simultaneous reproduction in a search with sound according to the fifth embodiment of the present invention.
FIG. 38 is a diagram showing conditions for conventional simultaneous recording.
FIG. 39 is a diagram showing a conventional simultaneous recording operation.

Claims (49)

A method of simultaneously recording a plurality of real-time data on an information recording medium according to a simultaneous recording model,
The simultaneous recording model includes a pickup P for accessing an area on the information recording medium, an encoding module EMi for encoding real-time data Di, and a recording buffer WBi for storing encoded real-time data Di. Including
The method comprises:
Searching for an unallocated area in the volume space on the information recording medium, and allocating at least one unallocated area in the volume space as an area Ai for recording real-time data Di;
Executing a recording operation Wi for recording the real-time data Di stored in the recording buffer WBi in the area Ai;
During the execution of the recording operation Wi, it is determined whether or not the recording buffer WBi is empty, and when it is determined that the recording buffer WBi is empty, the recording operation Wi is changed to the recording operation Wj (i ≠ j). And when it is determined that the recording buffer WBi is not empty, the step of continuing the recording operation Wi is included.
Each of the at least one area allocated as the area Ai is configured to satisfy the simultaneous recording condition that the recording buffer WBi can be made empty by at most one access operation and at most two recording operations. And
Here, i is any integer from 1 to n, and n is any integer from 2 to 2 indicating the number of a plurality of real-time data to be simultaneously recorded. Each of the at least one area allocated as the area Ai has a size of Y or more;
here,
Y = 2 × n × Ta × Vd × Vt ÷ (Vt−n × Vd),
Ta indicates an access time required for the pickup P to access between an innermost area and an outermost area of the information recording medium,
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
The method according to claim 1, wherein Vd indicates a data transfer rate between the encoding module EMi and the recording buffer WBi for all i. Each of the at least one area allocated as the area Ai has a size equal to or greater than Yi;
here,
Yi = (2 × n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)},
Ta indicates an access time required for the pickup P to access between an innermost area and an outermost area of the information recording medium,
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
The method of claim 1, wherein Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi. A first access time required for the pickup P to access the area Aj from the area Ai, and a time required for accessing the other one from one of the at least one area allocated as the area Ai. The method of claim 1, further comprising estimating a second access time. Each of the at least one area allocated as the area Ai has a size of Y or more;
here,
Y = {2 × (T1 +... + Tn) × Vt × Vd} (Vt−n × Vd), Ti indicates the first access time or the second access time,
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
5. The method according to claim 4, wherein Vd indicates a data transfer rate between the encoding module EMi and the recording buffer WBi for all i. Each of the at least one area allocated as the area Ai has a size equal to or greater than Yi;
here,
Yi = {2 × (T1 +... + Tn) × Vt × Vdi {Vt− (Vd1 + Vd2 +... + Vdn)},
Ti indicates the first access time or the second access time,
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
The method of claim 4, wherein Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi. The method according to claim 1, wherein the area Ai is provided on an outer peripheral portion of the information recording medium for all i. A method of simultaneously recording a plurality of real-time data on an information recording medium according to a simultaneous recording model,
The simultaneous recording model includes a pickup P for accessing an area on the information recording medium, an encoding module EMi for encoding real-time data Di, and a recording buffer WBi for storing encoded real-time data Di. Including
The method comprises:
Retrieving an unallocated area of the volume space on the information recording medium and allocating at least one unallocated area in the volume space as an area Ai for recording real-time data Di;
Executing a recording operation Wi for recording the real-time data Di stored in the recording buffer WBi in the area Ai;
In the recording operation Wi, it is determined whether or not the real-time data Di has been recorded to one end of at least one area allocated as the area Ai, and it is determined that the real-time data Di has been recorded to the end. In this case, the recording operation Wi is switched to the recording operation Wj (i 、 j), and if it is determined that the real-time data Di has not been recorded to the end, the recording operation Wi is continued. And
Each of the at least one area allocated as the area Ai is the real-time data stored in the recording buffer WBi between n access operations and (n-1) recording operations accompanying the switching of the recording process. It is configured to satisfy the simultaneous recording condition that Di can be recorded by one recording operation,
Here, i is any integer of 1 or more and n or less, and n is any integer of 2 or more indicating the number of a plurality of real-time data to be simultaneously recorded. Each of the at least one region assigned as region Ai has a size of Yi,
here,
Yi = (n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)},
Ta indicates an access time required for the pickup P to access between an innermost area and an outermost area of the information recording medium,
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
The method according to claim 8, wherein Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi. The method according to claim 8, further comprising estimating an access time required for the pickup P to access the area Aj from the area Ai. Each of the at least one region assigned as region Ai has a size of Y,
here,
Y = {(T1 +... + Tn) × Vt × Vd} (Vt−n × Vd),
Ti indicates the access time,
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
The method according to claim 10, wherein Vd indicates a data transfer rate between the encoding module EMi and the recording buffer WBi for all i. Each of the at least one region assigned as region Ai has a size of Yi,
here,
Yi = {(T1 +... + Tn) × Vt × Vdi {Vt− (Vd1 + Vd2 +... + Vdn)},
Ti indicates the access time,
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
The method according to claim 10, wherein Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi. 9. The method according to claim 8, wherein the area Ai is provided on the outer peripheral portion of the information recording medium for all i. An information recording device that simultaneously records a plurality of real-time data on an information recording medium according to a simultaneous recording model,
The simultaneous recording model includes a pickup P for accessing an area on the information recording medium, an encoding module EMi for encoding real-time data Di, and a recording buffer WBi for storing encoded real-time data Di. Including
The information recording device,
Means for searching for an unallocated area in the volume space on the information recording medium and allocating at least one unallocated area in the volume space as an area Ai for recording real-time data Di;
Means for executing a recording operation Wi for recording the real-time data Di stored in the recording buffer WBi in the area Ai;
During the execution of the recording operation Wi, it is determined whether or not the recording buffer Ai is empty. If it is determined that the recording buffer WBi is empty, the recording operation Wi is changed to the recording operation Wj (i ≠ j). And means for continuing the recording operation Wi when it is determined that the recording buffer WBi is not empty,
Each of the at least one area allocated as the area Ai is configured to satisfy the simultaneous recording condition that the recording buffer WBi can be made empty by at most one access operation and at most two recording operations. And
Here, i is an arbitrary integer from 1 to n, and n is an integer from 2 to 2 indicating the number of a plurality of real-time data to be simultaneously recorded. An information recording device that simultaneously records a plurality of real-time data on an information recording medium according to a simultaneous recording model,
The simultaneous recording model includes a pickup P for accessing an area on the information recording medium, an encoding module EMi for encoding real-time data Di, and a recording buffer WBi for storing encoded real-time data Di. Including
The information recording device,
Means for searching for an unallocated area in the volume space on the information recording medium and allocating at least one unallocated area in the volume space as an area Ai for recording real-time data Di;
Means for executing a recording operation Wi for recording the real-time data Di stored in the recording buffer WBi in the area Ai;
In the recording operation Wi, it is determined whether or not the real-time data Di has been recorded to one end of at least one area allocated as the area Ai, and it is determined that the real-time data Di has been recorded to the end. Means for switching the recording operation Wi to the recording operation Wj (i ≠ j) in the case where it is determined that the real-time data Di has not been recorded up to the end, and continuing the recording operation Wi. ,
Each of the at least one area allocated as the area Ai is the real-time data accumulated in the recording buffer WBi between n access operations and (n-1) recording operations accompanying the switching of the recording operation. It is configured to satisfy the simultaneous recording condition that Di can be recorded by one recording operation,
Here, i is an arbitrary integer from 1 to n, and n is an integer from 2 to 2 indicating the number of a plurality of real-time data to be simultaneously recorded. An information recording medium on which a plurality of real-time data are recorded according to a simultaneous recording model,
The simultaneous recording model includes a pickup P for accessing an area on the information recording medium, an encoding module EMi for encoding real-time data Di, and a recording buffer WBi for storing encoded real-time data Di. Each of at least one area including the area Ai for recording the real-time data Di stored in the recording buffer WBi includes the recording buffer WBi by at most one access operation and at most two recording operations. It is configured to satisfy the simultaneous recording condition that it can be empty,
Here, i is an arbitrary integer from 1 to n, and n is an integer from 2 to 2 indicating the number of a plurality of real-time data to be simultaneously recorded. Each of the at least one area allocated as the area Ai has a size of Y or more;
here,
Y = 2 × n × Ta × Vd × Vt ÷ (Vt−n × Vd),
Ta indicates an access time required for the pickup P to access between an innermost area and an outermost area of the information recording medium,
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
17. The information recording medium according to claim 16, wherein Vd indicates a data transfer rate between the encoding module EMi and the recording buffer WBi for all i. Each of the at least one area allocated as the area Ai has a size equal to or greater than Yi;
here,
Yi = (2 × n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)},
Ta indicates an access time required for the pickup P to access between an innermost area and an outermost area of the information recording medium,
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
17. The information recording medium according to claim 16, wherein Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi. Each of the at least one area allocated as the area Ai has a size of Y or more;
here,
Y = {2 × (T1 +... + Tn) × Vt × Vd} (Vt−n × Vd),
Ti is an estimate of the first access time required for the pickup P to access the area Aj from the area Ai, or one of the at least one area allocated as the area Ai and the other one. Showing an estimate of the second access time required to access
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
17. The information recording medium according to claim 16, wherein Vd indicates a data transfer rate between the encoding module EMi and the recording buffer WBi for all i. Each of the at least one area allocated as the area Ai has a size equal to or greater than Yi;
here,
Yi = {2 × (T1 +... + Tn) × Vt × Vdi {Vt− (Vd1 + Vd2 +... + Vdn)},
Ti is an estimate of the first access time required for the pickup P to access the area Aj from the area Ai, or one of the at least one area allocated as the area Ai and the other one. Showing an estimate of the second access time required to access
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
17. The information recording medium according to claim 16, wherein Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi. 17. The information recording medium according to claim 16, wherein the area Ai is provided on an outer peripheral portion of the information recording medium for all i. An information recording medium on which a plurality of real-time data are recorded according to a simultaneous recording model,
The simultaneous recording model includes a pickup P for accessing an area on the information recording medium, an encoding module EMi for encoding real-time data Di, and a recording buffer WBi for storing encoded real-time data Di. Each of the at least one area allocated as the area Ai for recording the real-time data Di stored in the recording buffer WBi includes n access operations and (n-1) recordings accompanying the switching of the recording process. The simultaneous recording condition that the real-time data Di accumulated in the recording buffer WBi during the operation can be recorded by one recording operation;
Here, i is an arbitrary integer from 1 to n, and n is an integer from 2 to 2 indicating the number of a plurality of real-time data to be simultaneously recorded. Each of the at least one region assigned as region Ai has a size of Yi,
here,
Yi = (n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)},
Ta indicates an access time required for the pickup P to access between an innermost area and an outermost area of the information recording medium,
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
23. The information recording medium according to claim 22, wherein Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi. Each of the at least one region assigned as region Ai has a size of Yi,
here,
Y = {(T1 +... + Tn) × Vt × Vd} (Vt−n × Vd),
Ti indicates an estimated access time required for the pickup P to access the area Aj from the area Ai,
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
23. The information recording medium according to claim 22, wherein Vd indicates a data transfer rate between the encoding module EMi and the recording buffer WBi for all i. Each of the at least one region assigned as region Ai has a size of Yi,
here,
Yi = {(T1 +... + Tn) × Vt × Vdi {Vt− (Vd1 + Vd2 +... + Vdn)},
Ti indicates an estimated access time required for the pickup P to access the area Aj from the area Ai,
Vt indicates a data transfer rate between the pickup P and the recording buffer WBi,
23. The information recording medium according to claim 22, wherein Vdi indicates a data transfer rate between the encoding module EMi and the recording buffer WBi. 23. The information recording medium according to claim 22, wherein the area Ai is provided on an outer peripheral portion of the information recording medium for all i. A method for simultaneously reproducing a plurality of real-time data recorded on an information recording medium according to a simultaneous reproduction model,
The simultaneous reproduction model includes a pickup P for accessing an area on the information recording medium, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a real-time data stored in the reproduction buffer RBi. A decoding module DMi for decoding the data Di,
The method comprises:
Executing a reproducing operation Ri for reading out the real-time data Di from the area Ai in which the real-time data Di is recorded;
During the execution of the reproduction operation Ri, it is determined whether or not the reproduction buffer RBi is full. If it is determined that the reproduction buffer RBi is full, the reproduction operation Ri is performed by the reproduction operation Rj (i ≠ j). And when it is determined that the reproduction buffer RBi is not full, a step of continuing the reproduction operation Ri is included.
Each of the at least one area allocated as the area Ai is configured to satisfy the simultaneous reproduction condition that the reproduction buffer RBi can be full by at most one access operation and at most two reproduction operations. And
Here, i is any integer from 1 to n, and n is any integer from 2 to 2 indicating the number of a plurality of real-time data to be reproduced simultaneously. Each of the at least one area allocated as the area Ai has a size of Y or more;
here,
Y = 2 × n × Ta × Vd × Vt ÷ (Vt−n × Vd),
Ta indicates an access time required for the pickup P to access between an innermost area and an outermost area of the information recording medium,
Vt indicates a data transfer rate between the pickup P and the reproduction buffer RBi,
28. The method of claim 27, wherein Vd indicates, for all i, the data transfer rate between the decoding module DMi and the playback buffer RBi. Each of the at least one area allocated as the area Ai has a size equal to or greater than Yi;
here,
Yi = (2 × n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)},
Ta indicates an access time required for the pickup P to access between an innermost area and an outermost area of the information recording medium,
Vt indicates a data transfer rate between the pickup P and the reproduction buffer RBi,
28. The method according to claim 27, wherein Vdi indicates a data transfer rate between the decoding module DMi and the playback buffer RBi. A first access time required for the pickup P to access the area Aj from the area Ai, and a time required for accessing the other one from one of the at least one area allocated as the area Ai. 28. The method of claim 27, further comprising estimating a second access time. Each of the at least one area allocated as the area Ai has a size of Y or more;
here,
Y = {2 × (T1 +... + Tn) × Vt × Vd} (Vt−n × Vd),
Ti indicates the first access time or the second access time,
Vt indicates a data transfer rate between the pickup P and the reproduction buffer RBi,
31. The method of claim 30, wherein Vd indicates, for all i, a data transfer rate between the decoding module DMi and the playback buffer RBi. Each of the at least one area allocated as the area Ai has a size equal to or greater than Yi;
here,
Yi = {2 × (T1 +... + Tn) × Vt × Vdi {Vt− (Vd1 + Vd2 +... + Vdn)},
Ti indicates the first access time or the second access time,
Vt indicates a data transfer rate between the pickup P and the reproduction buffer RBi,
The method according to claim 30, wherein Vdi indicates a data transfer rate between the decoding module DMi and the playback buffer RBi. The method according to claim 27, wherein the area Ai is provided on the outer peripheral portion of the information recording medium for all i. 28. The method according to claim 27, wherein the real-time data D1 to Dn include video data and a plurality of audio data, and a part of the video data and at least one of the plurality of audio data are reproduced simultaneously. . A method for simultaneously reproducing a plurality of real-time data recorded on an information recording medium according to a simultaneous reproduction model,
The simultaneous reproduction model includes a pickup P for accessing an area on the information recording medium, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a real-time data stored in the reproduction buffer RBi. A decoding module DMi for decoding the data Di,
The method comprises:
Executing a reproducing operation Ri for reading out the real-time data Di from the area Ai in which the real-time data Di is recorded;
In the reproducing operation Ri, it is determined whether the real-time data Di has been read to one end of the at least one area allocated as the area Ai, and the real-time data Di is read to the end. If it is determined that the reproduction operation Ri has been performed, the reproduction operation Ri is switched to the reproduction operation Rj (i ≠ j). If it is determined that the real-time data Di has not been read to the end, the reproduction operation Ri is continued. Steps and
In each of the at least one area allocated as the area Ai, the real-time data Di stored in the reproduction buffer RBi during one reproduction operation is accessed n times in accordance with switching of the reproduction operation, and (n− 1) It is configured to satisfy the simultaneous playback condition that it can be consumed between one playback operation and
Here, i is any integer from 1 to n, and n is any integer from 2 to 2 indicating the number of a plurality of real-time data to be reproduced simultaneously. Each of the at least one region assigned as region Ai has a size of Yi,
here,
Yi = (n × Ta × Vt × Vdi) {Vt− (Vd1 + Vd2 +... + Vdn)},
Ta indicates an access time required for the pickup P to access between the innermost circumference and the outermost circumference of the information recording medium,
Vt indicates a data transfer rate between the pickup P and the reproduction buffer RBi,
The method of claim 35, wherein Vdi indicates a data transfer rate between the decoding module DMi and the playback buffer RBi. The method according to claim 34, further comprising estimating an access time required for the pickup P to access the area Aj from the area Ai. Each of said at least one area allocated as area Ai has a size of Y,
here,
Y = {(T1 +... + Tn) × Vt × Vd} (Vt−n × Vd),
Ti indicates the access time,
Vt indicates a data transfer rate between the pickup P and the reproduction buffer RBi,
38. The method of claim 37, wherein Vd indicates, for all i, a data transfer rate between the decoding module DMi and the playback buffer RBi. Each of the at least one region assigned as region Ai has a size of Yi,
here,
Yi = {(T1 +... + Tn) × Vt × Vdi {Vt− (Vd1 + Vd2 +... + Vdn)},
Ti indicates the access time,
Vt indicates a data transfer rate between the pickup P and the reproduction buffer RBi,
38. The method of claim 37, wherein Vdi indicates a data transfer rate between the decoding module DMi and the playback buffer RBi. The method according to claim 35, wherein the area Ai is provided on an outer peripheral portion of the information recording medium for all i. The method according to claim 35, wherein the real-time data D1 to Dn include video data and a plurality of audio data, and a part of the video data and at least one of the plurality of audio data are reproduced simultaneously. . An information reproducing apparatus for simultaneously reproducing a plurality of real-time data recorded on an information recording medium according to a simultaneous reproduction model,
The simultaneous reproduction model includes a pickup P for accessing an area on the information recording medium, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a real-time data stored in the reproduction buffer RBi. A decoding module DMi for decoding the data Di,
The information reproducing device,
Means for executing a reproducing operation Ri for reading out the real-time data Di from the area Ai in which the real-time data Di is recorded;
During the execution of the reproduction operation Ri, it is determined whether or not the reproduction buffer RBi is full. Means for continuing the reproduction operation Ri when it is determined that the reproduction buffer RBi is not full,
Each of the at least one area allocated as the area Ai is configured to satisfy the simultaneous reproduction condition that the reproduction buffer RBi can be full by at most one access operation and at most two reproduction operations. And
Here, i is an arbitrary integer from 1 to n, and n is an arbitrary integer from 2 to 2 indicating the number of a plurality of real-time data to be simultaneously reproduced. An information reproducing apparatus for simultaneously reproducing a plurality of real-time data recorded on an information recording medium according to a simultaneous reproduction model,
The simultaneous reproduction model includes a pickup P for accessing an area on the information recording medium, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a real-time data stored in the reproduction buffer RBi. A decoding module DMi for decoding the data Di,
The information reproducing device,
Means for executing a reproducing operation Ri for reading out the real-time data Di from the area Ai in which the real-time data Di is recorded;
In the reproducing operation Ri, it is determined whether the real-time data Di has been read to one end of the at least one area allocated as the area Ai, and the real-time data Di is read to the end. If it is determined that the reproduction operation Ri has been performed, the reproduction operation Ri is switched to the reproduction operation Rj (i ≠ j). If it is determined that the real-time data Di has not been read to the end, the reproduction operation Ri is continued. Means,
Each of the at least one area allocated as the area Ai may include n times of access operations associated with switching of the reproduction operation between the real-time data Di accumulated in the reproduction buffer RBi during one reproduction operation and (n- 1) It is configured to satisfy the simultaneous playback condition that it can be consumed between one playback operation and
Here, i is an arbitrary integer from 1 to n, and n is an integer from 2 to 2 indicating the number of a plurality of real-time data to be reproduced simultaneously. A method of editing real-time data recorded on an information recording medium so as to ensure that a plurality of real-time data are reproduced simultaneously according to a simultaneous reproduction model,
The simultaneous reproduction model includes a pickup P for accessing an area on the information recording medium, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a real-time data stored in the reproduction buffer RBi. A decoding module DMi for decoding the data Di,
The method comprises:
Selecting at least one area from the area Ai in which the real-time data Di is recorded;
Whether each of the selected at least one region is configured to satisfy a simultaneous reproduction condition that the reproduction buffer RBi can be made full by at most one access operation and at most two reproduction operations. Deciding whether or not it is not. A method of editing real-time data recorded on an information recording medium so as to ensure that a plurality of real-time data are reproduced simultaneously according to a simultaneous reproduction model,
The simultaneous reproduction model includes a pickup P for accessing an area on the information recording medium, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a real-time data stored in the reproduction buffer RBi. A decoding module DMi for decoding the data Di,
The method comprises:
Selecting at least one area from the area Ai in which the real-time data Di is recorded;
Each of the at least one selected area uses the real-time data Di accumulated in the reproduction buffer RBi during one reproduction operation for n times of access operations and (n-1) times for switching the reproduction operation. And determining whether or not the simultaneous playback condition that can be consumed during the playback operation is satisfied. An editing apparatus for editing real-time data recorded on an information recording medium so as to ensure that a plurality of real-time data are reproduced simultaneously according to a simultaneous reproduction model,
The simultaneous reproduction model includes a pickup P for accessing an area on the information recording medium, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a real-time data stored in the reproduction buffer RBi. A decoding module DMi for decoding the data Di,
The editing device,
Means for selecting at least one area from the area Ai in which the real-time data Di is recorded;
Whether each of the at least one selected area is configured to satisfy a simultaneous reproduction condition that the reproduction buffer RBi can be made full by at most one access operation and at most two reproduction operations. An editing device comprising: An editing apparatus for editing real-time data recorded on an information recording medium so as to ensure that a plurality of real-time data are reproduced simultaneously according to a simultaneous reproduction model,
The simultaneous reproduction model includes a pickup P for accessing an area on the information recording medium, a reproduction buffer RBi for storing real-time data Di read from the information recording medium, and a real-time data stored in the reproduction buffer RBi. A decoding module DMi for decoding the data Di,
The editing device,
Means for selecting at least one area from the area Ai in which the real-time data Di is recorded;
Each of the at least one selected area is used for n times of access operations and (n-1) times of the real-time data Di accumulated in the reproduction buffer RBi during the one reproduction operation. Means for judging whether or not it is configured so as to satisfy a simultaneous playback condition that it can be consumed during a playback operation. A method of searching for one piece of video data while playing back k pieces of audio data recorded on an information recording medium according to a simultaneous playback model,
The simultaneous reproduction model includes a pickup P for accessing an area on the information recording medium, a reproduction buffer RBv for storing video data Dv read from the information recording medium, and a video data Dv stored in the reproduction buffer RBv. A decoding module DMv for decoding audio data Di read from the information recording medium, a decoding module DMv for decoding audio data Di stored in the reproduction buffer RBi, and a decoding module DMi for decoding audio data Di read from the information recording medium. Including
The method comprises:
Performing a reproducing operation Rv for partially reading the video data Dv from the area Av in which the video data Dv is recorded;
After the video data Dv is intermittently reproduced from n places in the area Av, accessing the recording area Ai and switching the reproduction operation Rv to the reproduction operation Ri;
Executing a reproducing operation Ri for reading the audio data Di from the area Ai in which the audio data Di is recorded;
Reading the data amount determined by the simultaneous reproduction condition from the area Ai, accessing the recording area Av, and switching the reproduction operation Ri to the reproduction operation Rv,
(N-1) accesses and n read operations in the region Av, access from the region Av to the region Ai, (k-1) accesses between the regions Ai, and (k-1) times Between the reading of the data from the area Ai and the access from the area Ai to the area Av, the real-time data Dj consumed in the reproduction buffer DMj is read in one reproduction operation, and the double speed of the search is m and is configured to satisfy the simultaneous playback condition that real-time data can be transferred from the playback buffer RBj to the decoding module DMj at a speed of m times.
Here, i, k, and n are arbitrary integers. An information reproducing apparatus for searching for one piece of video data while reproducing k pieces of audio data recorded on an information recording medium according to a simultaneous reproduction model,
The simultaneous reproduction model includes a pickup P for accessing an area on the information recording medium, a reproduction buffer RBv for storing video data Dv read from the information recording medium, and a video data Dv stored in the reproduction buffer RBv. A decoding module DMv for decoding audio data Di read from the information recording medium, a decoding module DMv for decoding audio data Di stored in the reproduction buffer RBi, and a decoding module DMi for decoding audio data Di read from the information recording medium. Including
The information reproducing device,
Means for executing a reproducing operation Rv for partially reading the video data Dv from the area Av in which the video data Dv is recorded;
Means for intermittently reproducing the video data Dv from n places in the area Av, accessing the recording area Ai, and switching the reproduction operation Rv to the reproduction operation Ri;
Means for executing a reproducing operation Ri for reading the audio data Di from the area Ai in which the audio data Di is recorded;
Means for reading the data amount determined by the simultaneous reproduction condition from the area Ai, accessing the recording area Av, and switching the reproduction operation Ri to the reproduction operation Rv,
(N-1) accesses and n read operations in the region Av, access from the region Av to the region Ai, (k-1) accesses between the regions Ai, and (k-1) times Between the reading of the data from the area Ai and the access from the area Ai to the area Av, the real-time data Dj consumed in the reproduction buffer DMj is read in one reproduction operation, and the double speed of the search is m. and is configured to satisfy the simultaneous playback condition that real-time data can be transferred from the playback buffer RBj to the decoding module DMj at a speed of m times.
Here, i, k, and n are arbitrary integers.

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