JP2003123395A - Information recording medium, information recording device and information reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording medium or the like, in which the recording capacity of audio information can be further improved while improving a degree of freedom in reproduction even when audio information is variably compressed and recorded. SOLUTION: In DVD audio recorded with recording information composed of information units respectively containing partial audio information obtained by dividing compressed audio information obtained by compressing audio information to a variable length, the information unit is composed of partial audio information and header information and the header information contains a pack header to be used for reproducing the partial audio information and front/ rear position information presenting a position on the information recording medium recording the partial audio information to be reproduced before and after on a reproduction time base just for 1200 pieces of partial audio information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium such as an optical disc, an information recording apparatus for recording recording information on the information recording medium, and an information reproducing apparatus for reproducing the recording information recorded on the information recording medium. More specifically, it belongs to a technical field, and more specifically, an information recording medium on which reproduction control information for controlling reproduction of the recorded information is recorded together with the recording information and a reproduction information together with the recording information on the information recording medium. It belongs to the technical field of an information recording device for recording control information and an information reproducing device for reproducing recorded information recorded on the information recording medium.

[0002]

2. Description of the Related Art In recent years, a technique has been developed in which the recording capacity of an information recording medium such as an optical disc is increased to record, for example, an entire movie on one optical disc.
As a result, a so-called DVD, which has a recording capacity about 7 times higher than that of a conventional CD (Compact Disc), has been put into practical use.

On this DVD, in addition to the so-called DVD video for recording a movie as described above, sound information other than sound information such as sound information and accompaniment (hereinafter, the sound information and sound information are summarized. Called audio information.)
A so-called DVD audio recording only the same is being put to practical use.

In the case of DVD audio, the DV
The audio information recorded on the D audio (disc recorded in the DVD audio format) may be uncompressed audio information such as so-called linear PCM (Pulse Code Modulation). In this case, if the number of quantization bits and the sampling frequency are increased, the audio information becomes enormous and a long-time music piece cannot be recorded on one DVD audio.

Therefore, attempts have been made to record uncompressed original audio information on DVD audio after compressing it.

Here, as a method for compressing the original audio information, there are a method of setting the compressed audio information obtained as a result of the compression to a fixed rate and a method of setting the compressed audio information to a variable rate. Considering that the characteristic of the original audio information to be compressed (specifically, for example, the amount of information in a unit time) changes momentarily in one original audio information, the latter so-called variable length compression is more preferable. It is considered that the recording density can be improved.

[0007]

However, the variable-length-compressed compressed audio information is recorded in D.
As a variation in reproduction control for VD audio, for example, fast-forward reproduction or fast-reverse reproduction (more specifically, forward jump to compressed audio information to be reproduced several seconds after or several seconds before compressed audio information currently being reproduced) Alternatively, intermittent fast-forward reproduction or fast-reverse reproduction is performed in which a backward jump is performed and the compressed audio information several seconds after or several seconds before is reproduced for a short time (for example, 0.2 seconds). However, since the recorded compressed audio information itself is compressed in a variable length, there is a problem that it is difficult to retrieve information several seconds after or several seconds before.

That is, when the compression method is a fixed rate, it is possible to retrieve the position to jump by multiplying the information amount per unit time by the time to jump, but when the compression method is a variable rate. , The amount of information per unit time changes, which makes it extremely complicated to search for a position to jump to. As a result, there is a problem in that the fast-forward reproduction or the fast-reverse reproduction cannot be executed, the variation in reproducing the compressed audio information is reduced, and the degree of freedom in reproduction is significantly reduced.

Therefore, the present invention has been made in view of the above problems, and its object is to variably compress the original audio information so that a long-time music piece can be recorded and to reproduce compressed audio information. Information recording medium capable of increasing the number of variations to improve the degree of freedom during reproduction, an information recording device for recording compressed audio information on the information recording medium, and reproducing compressed audio information recorded on the information recording medium It is to provide an information reproducing apparatus that

[0010]

In order to solve the above problems, the invention according to claim 1 is a partial audio information obtained by dividing compressed audio information obtained by variable length compression of original audio information. A DVD on which recording information composed of information units each containing
In an information recording medium such as audio, the information unit includes header information and head data which is the compressed audio information arranged at the head of one or more of the partial audio information, and the header In the information, reproduction time control information such as PTS indicating a time at which the partial audio information to which the first head data among the head data included in the information unit belongs together with the header information, and the header are included. The portion to be reproduced earlier on the reproduction time axis of the compressed audio information by 1200 pieces of the partial audio information counted from the partial audio information included at the head of the information unit including information Previous position information such as a front search pointer indicating the position on the information recording medium where the audio information is recorded, and The partial audio information to be reproduced later on the reproduction time axis is recorded by 1200 pieces of the partial audio information counted from the partial audio information included at the head of the information unit including the sub information. And at least back position information such as a backward search pointer indicating a position on the information recording medium.

Therefore, even when the information amount of the compressed audio information included in each information unit is different due to the variable length compression, the reproduction is controlled by using the front position information or the rear position information at the time of reproduction. By doing so, it is possible to quickly retrieve the compressed audio information at the desired position.

In order to solve the above-mentioned problems, the invention according to claim 2 is the information recording medium according to claim 1, wherein the front position information is the information unit in which the front position information is recorded. For the position on the information recording medium of
The rear position information is relative position information indicating the position on the information recording medium of the information unit in which the head data to be reproduced before 1200 pieces of the partial audio information is recorded. The information recording of the information unit in which the head data to be reproduced after 1200 pieces of the partial audio information with respect to the position on the information recording medium of the information unit in which the rear position information is recorded is recorded. It is configured to be relative position information indicating a position on the medium.

Therefore, since the front position information and the rear position information are recorded as the relative position information, respectively, the front position information and the rear position information can be expressed with the minimum amount of information.

In order to solve the above-mentioned problems, the invention according to claim 3 is the information recording medium according to claim 1 or 2, wherein the recording information is a physical layer having the information unit as the lowermost layer. A hierarchical structure is formed and recorded on the information recording medium.

Therefore, it is possible to more efficiently retrieve the partial audio information corresponding to the front position information or the partial audio information corresponding to the rear position information.

In order to solve the above-mentioned problems, the invention according to claim 4 is the information recording medium according to claim 3, wherein the compression is added to the head of the recording information corresponding to the uppermost layer in the hierarchical structure. Management information, which is reproduction control information related to the entire audio information, is recorded. Therefore,
The compressed audio information can be quickly searched by effectively using the management information and the front position information and the rear position information.

In order to solve the above-mentioned problems, the invention described in claim 5 is the information recording medium according to claim 4, wherein the compressed audio information is composed of one or a plurality of pieces of music information, and the management information. Need not include song address information for searching the compressed audio information in units of the song information, and song reproduction time information indicating a playback time when the compressed audio information is played in units of the song information. Configured to include.

Therefore, by using the management information and the front position information and the rear position information, it is possible to perform a search for each song, and it is also possible to perform a partial search within one song or fast forward reproduction or fast reverse reproduction. In order to solve the above-mentioned problem, the invention according to claim 6 is an information unit obtained by dividing compressed audio information obtained by variable-length compression of original audio information, and is compressed audio information and header information. An information recording device for recording recording information composed of an information unit including at least the following in an information recording medium such as a DVD audio, which is used when reproducing the compressed audio information included in the information unit together with the header information. Reproduction control information generating means such as a signal processing unit for generating reproduction control information, and 1200 parts of the partial audio information included at the beginning of the information unit including the header information. Only the audio information is recorded with the partial audio information to be reproduced before on the reproduction time axis of the compressed audio information. Pre-position information generating means such as a signal processing unit for generating pre-position information indicating the position on the information recording medium, and the partial audio information included at the beginning of the information unit including the header information. Signal processing unit for generating rear position information indicating a position on the information recording medium in which the partial audio information to be reproduced later on the reproduction time axis is recorded by 1200 pieces of the partial audio information counted from Etc., and recording means such as a mastering device for recording the reproduction control information, the front position information and the rear position information respectively generated on the information recording medium as the header information. .

Therefore, since the front position information and the rear position information are recorded in the header information recorded in the information unit together with the compressed audio information, the information is included in each information unit due to the variable length compression. Even if the information amounts of the compressed audio information to be reproduced are different from each other, it is possible to quickly retrieve the compressed audio information by controlling the reproduction using the front position information or the rear position information at the time of reproduction.

In order to solve the above-mentioned problems, a fourth aspect of the present invention is provided.
The described invention is an information reproducing apparatus for reproducing the compressed audio information from the information recording medium according to claim 1,
A detection means such as a pickup for detecting the front position information, and an audio decoder for reproducing at least a part of the compressed audio information recorded at the position on the information recording medium indicated by the detected front position information. Reproducing means and pre-position information recorded in the information unit containing the reproduced compressed audio information is detected as new pre-position information, and the information indicated by the new pre-position information is detected. Control means such as a system controller for controlling the detecting means and the reproducing means so as to repeat reproducing at least a part of the compressed audio information recorded at the position on the recording medium.

Therefore, the front position information is detected, at least a part of the compressed audio information recorded at the position on the information recording medium indicated by the detected front position information is reproduced, and further the reproduced compressed audio information is reproduced. Since the detection of the previous position information recorded with is repeated,
It is possible to quickly rewind and reproduce the compressed audio information that has been compressed in a variable length.

In order to solve the above-mentioned problems, a fifteenth aspect is provided.
The described invention is an information reproducing apparatus for reproducing the compressed audio information from the information recording medium according to claim 1,
A detection means such as a pickup for detecting the rear position information, and an audio decoder for reproducing at least a part of the compressed audio information recorded at the position on the information recording medium indicated by the detected rear position information. Reproducing means and rear position information recorded in the information unit containing the reproduced compressed audio information is detected as new rear position information, and the information indicated by the new rear position information is detected. Control means such as a system controller for controlling the detecting means and the reproducing means so as to repeat reproducing at least a part of the compressed audio information recorded at the position on the recording medium.

Therefore, the rear position information is detected, at least a part of the compressed audio information recorded at the position on the information recording medium indicated by the detected rear position information is reproduced, and the reproduced compressed audio information is further reproduced. Since the detection of the post position information recorded with is repeated,
Compressed audio information that has been compressed in a variable length can be quickly fast-forwarded and reproduced.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Next, preferred embodiments of the present invention will be described with reference to the drawings. The embodiments described below are for the DVD audio and the DV.
Disk manufacturing apparatus for manufacturing D audio and the D
It is an embodiment in the case where the present invention is applied to an information reproducing apparatus for reproducing audio information recorded in VD audio.

In the following embodiments, an example of each constituent element in the claims shown on the left side of the following list is made up of the elements shown on the right side of the following list.

Partial audio information: Access unit (compressed audio frame) Information unit: ........ Audio pack header information ........... Private header playback time control information ..... PTS in packet header Front position information ……………… Front search pointer Back position information ……………… Back search pointer management information ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… although ： AMG ：
I song address information ………… Audio title set cell playback information in ATSI
Track start address song playback time information in table or SAPPT ………… Audio title set program playback time in audio title set program information table or track playback time (I) information in SAPPT Embodiment of Recording Medium First, the physical and logical configuration of the DVD audio which is an embodiment of the information recording medium according to the present invention will be described with reference to FIGS. 1 to 3.

1 and 2 are diagrams showing a recording format of DVD audio, and FIG. 3 is a diagram showing a logical format of DVD audio.

First, a recording format (physical recording format) of audio information on DVD audio will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, a DVD audio 200 as an information recording medium of the embodiment has a lead-in area LI at its innermost peripheral portion and a lead-out area LO at its outermost peripheral portion. Between them, one volume space VS is formed.

Then, in the volume space VS, from the lead-in area LI side, the DVD audio 2
UDF (Universal Disk For) including information for managing the file structure of audio information recorded in 00.
mat) 201, at least one audio zone 200 ′ that actually contains audio information, and an other zone 200 ″ that contains information other than audio information.

Next, the audio information contained in the audio zone 200 'includes a plurality of ATSs (Audio Title Sets) 203 (ATSs) each having an ID (identification) number.
# 1 to ATS # n). Further, in the portion other than the ATS 203 in the audio zone 200 ′, audio information (actual DVD audio 200, as will be described later) from the beginning of the audio zone 200 ′. In the above, the audio information is compressed in a variable length.) SAPPT (Simple Audio Play Pointer Table) which is information necessary for reproducing in two channels.
204 (This SAPPT 204 is audio zone 20
It is always recorded in all DVD audios 200 having 0 '. ) And an AMG (Audio Manager) 202, which is information necessary for reproducing a later-described title group recorded in the audio zone 200 '.

In the SAPPT, a start address and an end address indicating recording positions on the DVD audio 200 of all tracks (songs) which will be described later that can be reproduced on two channels, and a head PTS (Presentati) of each track.
on Time Stamp; PTS will be described in detail later. ), Track reproduction time, etc. are recorded.

In the AMG 202, for example, a menu for prompting the viewer to select an item, information for preventing illegal copying, an access table for reproducing each title, and the like, the DVD audio 200. The information related to the entire audio information recorded in is recorded.

Next, the first ATS 203 is ATSI (Au
dio Title Set Information) 211 at the top,
Multiple AOBs (Audio Objec), each with an ID number
t) 210.

Here, a portion composed of a plurality of AOBs 210 is generally called an AOB set (AOBS). This AOB set is for handling the substantial portion of audio information separately from other control information.

Next, A recorded at the beginning of the ATS 203
In the TSI 211, ATSPGCI (Audio) which is various information regarding a program chain which is a logical division of a plurality of cells (cells will be described later) is combined.
Information such as Title Set Program Chain Information) is recorded.

Further, each AOB 210 includes a substantial portion of audio information. And one AOB21
0 is composed of a plurality of cells 220 each having an ID number.

Next, one cell 220 is a plurality of audio packs 2 which are the lowest layers of the hierarchical structure and are respectively packed.
It is composed of 30. Here, the audio pack 23
0 is a pack of variable-length-compressed audio information to be recorded in the DVD audio 200, which is packed in a predetermined size.

In one cell 220, in addition to the audio pack 230, one or a plurality of audio packs 230 may be replaced with information about the composer and copyright, text information such as song titles and lyrics, and Internet homepage. Access information for accessing BPM (Beat
It is also possible to include a real time information pack including Per Minutes or beat information.

Next, in one audio pack 230,
From the beginning, a pack header 240 and a private stream 1 containing audio information in the audio pack 230 (MP as an example of a compression method)
A packet header 2 including an identification number or the like for identifying a packet of a stream format defined by the EG (Moving Picture Expert Group) method)
41, an identification number for identifying an information unit that actually includes compressed audio information, and a recording position on the DVD audio 200 of a packet to be reproduced 1 second before or 1 second after the present invention. A private header 242 including the indicated address information and the like, and compressed audio data 243 which is the actual portion of the audio information are included. At this time, as the information contained in the packet header 241, specifically, as shown in FIG. 2A, the start code 241a (3 bytes) and the information recorded after the packet header 241 are recorded. Stream identification data 241b (1 byte) that is a flag for identifying the private stream 1, and packet length data 241c that indicates the length of the packet itself.
(2 bytes), copy control information 241d (3 bytes), access unit (DVD) recorded in compressed audio information 243 recorded after the packet header 241 and private header 242.
The access unit to be accessed first (specifically, FIG. 2C) of the minimum unit of accessible information generated when the audio information to be recorded in the audio 200 is compressed to generate the compressed audio information. ), The access units 243 _n−1 , 243 _n and 243 _{n + 1} recorded in the compressed audio information 243.
Of the above, P indicating the time corresponding to the reproduction time of the first access unit 243 _n ) recorded from the head data T
There is TS241e (5 bytes) and the like.

Here, in FIG. 2C, the access unit 243 _n-1 is an access unit starting from the middle (the first half of the other access units are recorded in the immediately preceding pack). In addition, the access unit 2
43 _n is an access unit completed within this pack, and the head data T is the head data of the access unit 243 _n . Furthermore, the access unit 243 _{n + 1}
Is an access unit that ends in the middle (the latter half of the other access units are recorded in the pack immediately after), and the head data T ′ is the head data of the access unit 243 _{n + 1} .

On the other hand, as the information contained in the private header 242, specifically, as shown in FIG. 2B, the information recorded after the private header 242 is compressed audio information. Substream identification data 242a which is a flag for identifying
(1 byte), spare data areas 242b and 242g
(Total 4 bytes), private header length data 242c (1 byte) indicating the length of the private header 242 itself, and recording in the compressed audio data 243 of the compressed audio data 243 of the access unit that should be accessed first during reproduction. The first access unit pointer 242d (2 bytes) indicating the position is reproduced one second before the reproduction time of the access unit to be accessed first (that is, the access unit 243 _{n in} the example of FIG. 2C). The forward search pointer 242e (1 byte) as the previous position information indicating the recording position on the DVD audio 200 of the pack in which the head data T of the access unit to be recorded is recorded. Of the pack in which the top data T is recorded Rear search pointer 242 as the position information after indicating the recording position on the VD audio 200
There is stuffing byte 242h (8 bytes or less) which is dummy data for adjusting the length of f (1 byte) and the private header 242 itself.

Here, the forward search pointer 242e is used.
And the backward search pointer 242f are respectively the forward search pointer 242e and the backward search pointer 242.
The address information indicating the recording position of the audio pack 230 including the head data T of the access unit to be reproduced one second before or one second after the audio pack 230 including f is set to the forward search pointer 242.
It is described as a relative address with respect to the audio pack 230 including the e and the backward search pointer 242f.

The address information indicating the recording position of the audio pack 230 including the head data T of the access unit to be reproduced one second before (or one second after) is the fast-forward in the information reproducing apparatus described later. In this case, one second before (or one second after) in order to efficiently perform the fast-forward reproduction without causing a feeling of strangeness in reproduction or fast-reverse reproduction.

That is, if the time is longer than 1 second, unnecessary time is required from the actual jump to the desired time to be reproduced. On the other hand, in the case of intermittent reproduction, the intermittent time becomes long. So it will be unnatural. Furthermore, if the time is shorter than 1 second, the distance of one jump becomes short, so in some cases, the audio information search becomes slower when the jump is performed rather than continuing the reproduction, and the intermittent reproduction becomes slower. Furthermore, unlike video information, there is no frame-by-frame playback in audio information, so there is no point in playing back in units shorter than 1 second, and the playback time specified by the viewer is also in units of 1 second.
A value of "1 second" is the optimum value.

In the above-described hierarchical format recording format shown in FIG. 1, each division is made by the producer of audio information to be recorded in the DVD audio 200 (hereinafter, simply referred to as the producer) according to its intention. You can freely set and record the categories. By reproducing each of these divisions based on the later-described logical structure, various reproductions rich in change are possible.

Next, a logical format (logical structure) in which information recorded by the physical divisions shown in FIGS. 1 and 2 is combined will be described with reference to FIG.

The logical structure shown in FIG. 3 does not mean that the audio information is actually recorded on the DVD audio 200 by the structure. That is, audio information is recorded on the DVD audio 200 only in the physical format shown in FIGS. 1 and 2, and information for reproducing this audio information in the logical structure shown in FIG. 3 is physically shown in FIG. The SAPPT 204 described above in the structure,
It is recorded in the AMG 202, the ATSI 211 and the like.

For convenience of explanation, starting from the lower hierarchy of FIG. 3, one or a plurality of cells (or partial music pieces) 220 of the physical structure described in FIG. 1 are selected and combined. , Index 259 is logically constructed. At this time, the index 259 can be handled as a music number and is the smallest unit accessible by the viewer selection. Using this index 259,
For example, one song is divided into an intro part and a chorus part.

Next, one track 260 is logically constructed by one or a plurality of indexes 259. The track 260 is an information unit corresponding to one music piece. Then, the viewer can select any track (song) 260 and directly access it.

Here, the number of one cell 220 is treated as a cell ID number when the cell 220 is handled in the physical format shown in FIG. 1 (see FIG. 1).
Medium, cell ID # is shown. ), When handling in the logical format shown in FIG. 3, the cell numbers are handled in the order of description in ATSPGCI described later.

The track 260 also includes a plurality of cells 22.
It is an information unit including 0, and is a set of cells 220 having a certain common attribute or the like. That is, the attributes of all cells 220 in the track 260 are all the same. Further, all cells 220 included in the track 260 are recorded adjacently in the same area on the DVD audio 200. Next, one title 261 is logically constructed by combining one or a plurality of tracks 260. At this time, the viewer does not recognize the title 261 itself as a unit of access. Therefore, for example, it is impossible to arbitrarily access each title 261 by designating the number of the title 261.

In the DVD audio 200, the attributes of each track 260 constituting the title 261 can be independently defined from the maximum of eight types of attributes. That is, the attributes as audio information such as the number of channels, the quantization method, and the sampling frequency can be changed for each track 260.

Further, the ATSPGCI described above is defined in units of the title 261, the attributes of each track 260, the reproduction order of the cells 220 of each track 260 when the respective tracks 260 are reproduced, The address of each cell 220 that is the recording position on the DVD audio 200, the number of the head cell 220 to be reproduced in one track 260, the head PTS of each track 260, the track reproduction time, the reproduction method, various commands, etc. are included. Has been. In addition to the ATS_PGCI, one title 261 includes substantive audio information as a combination of tracks 260 (in other words, as a combination of cells 220).

The ATSPGCI is recorded in the ATSI 211 in the ATS 203 referred to in the physical structure of FIG.

Next, one or a plurality of titles 261 logically constitutes one title group 262. The title group 262 is a maximum unit that can be accessed by the viewer, and a maximum of nine title groups 262 can be defined in one volume 263 described later. Here, the title group 262 is composed of one or a plurality of titles 261 that are gathered based on a certain relation, and all the titles 261 in the title group 262 are continuously reproduced. Specifically, for example, a singer, a composer's music collection, etc. can be collected as one title group 262.

Next, one or a plurality of title groups 26
2 logically configures one volume 263 described above. The volume 263 is an information unit corresponding to one side (side) of one DVD audio disc.

Here, the actual audio information included in one title 261 shown in FIG. 3 is the DVD audio 2
00, it is recorded in any one of the ATSs 203 shown in FIG.

Based on the logical format described above, the producer designates the information division in each audio information divided in the physical structure shown in FIG. 1, whereby the music listened to by the viewer is formed. . (II) Embodiment of Information Recording Device Next, FIGS. 4 to 7 will be used for an embodiment of an information recording device for manufacturing a DVD audio 200 in which audio information having the structure shown in FIGS. 1 to 3 is recorded. Explain.

FIG. 4 is a block diagram showing a schematic structure of the information recording apparatus of the embodiment, and FIGS. 5 to 7 are flow charts showing the operation of the information recording apparatus.

Further, the information recording apparatus of the embodiments described below has the above-mentioned audio information with respect to a so-called stamper disk as a master (cutting die) for mass-producing the DVD audio 200 in which the audio information is recorded. 2 is an embodiment of an information recording apparatus for recording (that is, a disk manufacturing apparatus for manufacturing the stamper disk).

First, the overall structure and operation of the information recording apparatus of the embodiment will be described with reference to FIG.

As shown in FIG. 4, the information recording apparatus R according to the embodiment has a master tape reproducing section 70 and a memory 71.
A signal processing section 72 as a reproduction control information generating means, a front position information generating means and a rear position information generating means, hard disk devices 73 and 74, a controller 75, a multiplexer 76, a modulator 77, and a recording means. And the mastering device 78.

Next, the operation will be described.

The master tape reproducing section 70 reproduces the master tape in which the audio information (uncompressed audio information) R to be recorded in the DVD audio 200 is reproduced, and the signal processing section 72 requests the signal processing. It is output to the unit 72.

Next, the signal processing section 72 A / D-converts the audio information R output from the master tape reproducing section 70 and then preset a predetermined variable length compression method (for example,
It is compressed using the above-mentioned MPEG method) and is output as a compressed signal Sr. After that, the output compressed signal Sr is temporarily stored in the hard disk device 73.

In parallel with these, the memory 71 controls the control information (FIG. 1) for controlling the reproduction of the audio information R.
In SAPPT204, AMG202, ATSI
211 and the like are included. The control information input in advance based on the cue sheet ST described in () is temporarily stored, and is output as the control information signal Si based on a request from the signal processing unit 72. Specifically, the control information signal Si includes the SAPPT 204, the AMG 202, and the ATSI2.
Information for dividing the audio information R into audio packs 230 is included in addition to the information that is the source of the management information 11 in FIG.

As a result, the signal processing section 72 determines the time code Tt based on the time code Tt corresponding to the audio information R output from the master tape reproducing section 70 and the control information signal Si output from the memory 71. By referring to the control information included in the control information signal Si, music reproduction time information and the like are generated, and SAPPT including these is generated.
204, AMG 202 and ATSI 211 and other management information, and control information signal S corresponding to each pack header 240, packet header 241 and private header 242.
It is output as nav and temporarily stored in the hard disk device 74.

Then, the processing described above is executed for the entire audio information R.

Next, when the above processing is completed for all the audio information R, the controller 75 reads the compression signal Sr from the hard disk device 73 and the control information signal Snav from the hard disk device 74, and based on these, the final SAPPT204, A
The song address information recorded in the management information such as the MG 202 and the ATSI 211, the information that should be included in each pack header 240, the packet header 241, and each private header 242 are generated, and the final control information signal Snav is generated. It is recorded again in the hard disk device 74. This processing is executed because the content of some of the control information is determined by the generation result of the compressed signal Sr.

Then, at this stage, the private header 240 described above is taken into consideration by the processing described later in consideration of the length of each access unit included in the compressed signal Sr.
A forward search pointer 242e and a backward search pointer 242f to be inserted are generated, and the control information signal Snav is generated.
Will be re-recorded in the hard disk device 74.

On the other hand, the controller 75 manages the time of each operation of the signal processing unit 72 and the hard disk devices 73 and 74, and adds the additional information signal Sa including the control information signal Snav (which is temporarily recorded first). Control information signal Sn
Corresponds to av. ) Is read from the hard disk device 74 and output, the compressed signal Sr is read from the hard disk device 73 and output, and the information selection signal Scc for time-axis multiplexing the compressed signal Sr and the additional information signal Sa.
Is generated and output.

After that, the hard disk devices 73 and 74
The compressed signal Sr (containing compressed audio information) and the additional information signal Sa read from the multiplexer 7 are based on the information selection signal Scc from the controller 75.
6 is time-axis multiplexed and output as the information-added compressed signal Sap. By this processing, the above-mentioned SAPPT20
4, management information such as AMG202, ATSI211 and the like, and each pack header 240, packet header 241, and private header 242 are inserted into the compressed audio information in the compressed signal Sr as audio information to be recorded on the DVD audio disc. The physical structure shown in FIG. 1 is completed.

After that, the modulator 77 adds an error correction code (ECC) such as Reed-Solomon code to the output information-added compressed signal Sap and performs modulation such as 8-16 modulation to obtain a disc recording signal Sm. It is generated and output to the mastering device 78.

Finally, the mastering device 78 records the disc recording signal Sm on the stamper disc. Then, using this stamper disk, a DVD audio 200, which is a commercially available replica disk, is manufactured by a replication device (not shown).

Next, among the operations of the information recording apparatus R described above, the generation processing of the forward search pointer 242e and the backward search pointer 242f according to the present invention and the insertion processing into the compressed audio information will be described with reference to FIGS. This will be described using 7.

In the process of generating the forward search pointer 242e and the backward search pointer 242f and the process of inserting it into the compressed audio information, first, the signal processing unit 7 is executed.
2, the uncompressed audio information R (in this case, the uncompressed audio information (needless to say,
It is digital information. ) Is composed of a plurality of audio frames each containing a fixed number of samples of audio information (the reproduction time of each audio frame is 1/1200 seconds). ) Is encoded and variable length compression is performed for each block obtained by further dividing the audio frame at equal intervals to generate a compressed signal Sr (step S1).

Then, the total data amount D (n) contained in each audio frame in the compressed signal Sr is calculated for each audio frame and temporarily stored in a memory (not shown) in the signal processing unit 72. (Step S
2). The process of step S2 is performed for each AOB 210. Here, the parameter n indicates the number of each audio frame to be included in one AOB 210 from the beginning of the AOB 210, and therefore one AOB 21
If the total number of audio frames included in 0 is m, then for the parameter n,

1 ≦ n ≦ m, (n is a natural number) Becomes

Next, the compressed audio information is divided for each audio pack 230, and further the pack header 24
0, packet header 241, private header 242
The so-called packetizing is performed to add items such as (step S
3). At this time, at the same time, the SAPPT 204 and AMG
202, ATSI 211, etc. are also formed.

Then, the number Ni of the audio frame located at the head (that is, currently reproduced) in the compressed audio data 243 in each audio pack 230 (packet) and the audio frame of the number Ni are corresponded. DV at the beginning of the audio pack 230
The address Pka (i) on the D audio 200 is acquired (step S4).

The DVD audio 200 of the embodiment is used.
In, one AOB 210 has two or more titles 26
Since it may be included in 1 (this is called reusing of AOB 210), the address of each audio pack 230 is set to a value that completes in units of AOB 210, and the first audio pack 23 in one AOB 210.
The address of 0 is always the initial value of the address. Therefore, the parameter Ni is also given while being initialized in units of AOB 210.

Further, the parameter i in step S4
Is the number of audio packs 230 in one AOB 210,

1 ≦ i ≦ l, l ≦ m, (l and m are natural numbers)
Becomes

Next, for the audio frame to be positioned at the beginning of each audio pack 230, the address Ap (i) of the audio pack 230 including the audio frame to be reproduced 1 second before the audio frame is acquired. (Step S5) Further, each audio pack 23
With respect to the audio frame to be positioned at the beginning of 0, the address An (i) of the audio pack 230 including the audio frame to be reproduced 1 second after the audio frame is acquired (step S6). This step S5
The processing of S6 and S6 will be described later in detail.

Then, the acquired addresses Ap (i) and An
(i) is described in the private header 242 as the forward search pointer 242e and the backward search pointer 242f, respectively, and the process is terminated (step S7).

Next, the address Ap in step S5
Details of the acquisition process (i) will be described with reference to FIG.

As shown in FIG. 6, in step S5, first, a parameter i indicating the number of each audio pack 230 in one AOB 210 is initialized (step S10), and then the acquired audio pack 230 is obtained. It is determined whether or not the number Ni of the audio frame located at the head of is smaller than "1200 (that is, the number of audio frames reproduced in one second)" (step S11).

Then, in the determination of step S11,
When the audio frame number Ni is smaller than “1200” (step S11; T), the AOB 210 to which the audio frame belongs does not have an audio frame one second before the audio frame (in other words, the audio frame Is AOB210
Of the address Ap (i) as "FFh (h represents a hexadecimal number)" (step S
13) Go to step S17.

On the other hand, if it is determined in step S11 that the audio frame number Ni is not smaller than "1200" (step S11; F), the audio frame 1 second before the audio frame in the AOB 210 to which the audio frame belongs is determined. If it exists, then the parameter j temporarily indicating the number of the audio pack 230 including the audio frame of 1 second before is initialized (step S12).

Then, the number Nj of the audio frame located at the beginning of the compressed audio data 243 in the audio pack 230 containing the audio frame of one second before is 1200 from the number Ni of the audio frame. Is determined to be greater than the subtracted value (step S14), and if not greater (step S14; F), the audio frame indicated by the number Nj is the audio frame indicated by the number Ni (the audio currently reproduced). Since the audio frame is to be played back before 1 second before (frame), the value of the parameter j is incremented (step S15), and the process returns to step S14 again.

The processes of steps S14 and S15 are processes for detecting the number of the audio frame to be reproduced one second before the currently reproduced audio frame.

On the other hand, when it is determined in step S14 that the audio frame number Nj is larger than the value obtained by subtracting 1200 from the audio frame number Ni (step S14; T), the number Nj is reached.
Assuming that the audio pack containing the audio frame indicated by is the audio pack next to the audio pack containing the audio frame to be played back one second before the currently played audio frame, the address P
D at the beginning of the audio pack 230 immediately before the audio pack including the audio frame of number Nj from ka (i)
The address Pka (j-1) on the VD audio 200 is subtracted, and this is used as the address (relative address) Ap (i) as the forward search pointer 242e (step S16).

Then, the parameter i is incremented (step S17), and further, whether or not the value of the parameter i is the value l or less, that is, the addresses Ap (i) are obtained for all the audio packs 230 in one AOB 210. Confirm whether or not is completed (step S1
8) If it is completed (step S18; F), the process proceeds to step S6 as it is. On the other hand, if it is not completed (step S18; T), the process returns to step S11 and the above-described operation is repeated.

Next, the address An in step S6
Details of the acquisition process (i) will be described with reference to FIG. 7.

As shown in FIG. 7, in step S6, first, a parameter i indicating the number of each audio pack 230 in one AOB 210 is initialized (step S20), and then the acquired audio pack 230 is obtained. It is determined whether or not the number Ni of the audio frame located at the beginning of the is larger than "m-1200" (step S21).

Then, in the determination of step S21,
When the audio frame number Ni is larger than "m-1200" (step S12; T), the AOB 210 to which the audio frame belongs does not have an audio frame one second after the audio frame (in other words, Audio frame is AOB21
The address An (i) is set as "FFh (h indicates a hexadecimal number)" as the reproduction position after 1 second before the end of 0 (step S23), and the process proceeds to step S28, while step S21. When the number of the audio frame is not larger than “m-1200” in the determination (step S21; F), it is determined that there is an audio frame 1 second after the audio frame in the AOB 210 to which the audio frame belongs.
Next, a parameter j tentatively indicating the number of the audio pack 230 including the audio frame 1 second later
Are initialized (step S22).

Then, the number Nj of the audio frame located at the beginning of the compressed audio data 243 in the audio pack 230 containing the audio frame one second later is the same as the number Ni of the audio frame and 1200. It is determined whether or not it is larger than the value obtained by adding and (step S24), and when it is not larger (step S24; F), the audio frame indicated by the number Nj is the audio frame indicated by the number Ni (currently reproduced). Since it is an audio frame to be played back before 1 second after (audio frame), the value of the parameter j is incremented (step S25), and whether or not the value of the parameter j is equal to or less than the above value l, that is, , About all audio packs 230 in one AOB 210 It is confirmed whether or not the process of step S24 is completed (step S26), and when it is completed (step S26; F), the process directly proceeds to step S27, while when it is not completed (step S25; T), and the process returns to step S24 again. The processes of steps S24 and S25 are processes for calculating the number of the audio frame next to the audio frame to be reproduced one second after the currently reproduced audio frame.

On the other hand, when it is determined in step S24 that the audio frame number Nj is larger than the value obtained by adding 1200 to the audio frame number Ni (step S24; T), it is indicated by the number Nj. Assuming that the audio pack containing the audio frame to be played is the next audio pack of the audio pack containing the audio frame to be played one second after the audio frame currently playing, the audio pack containing the audio frame of number Nj DVD audio 200 at the beginning of the previous audio pack 230
Subtract the address Pka (i) from the above address Pka (j-1),
This is used as the address (relative address) An (i) as the backward search pointer 242f (step S27).

Then, the parameter i is incremented (step S28), and whether or not the value of the parameter i is less than or equal to the value l, that is, the addresses An (i) are acquired for all the audio packs 230 in one AOB 210. Confirm whether or not is completed (step S2
9) If it is completed (step S29; F), the process directly proceeds to step S7. On the other hand, if it is not completed (step S29; T), the process returns to step S21 and the above-described operation is repeated. (III) Embodiment of Information Reproducing Apparatus Next, an embodiment of an information reproducing apparatus for reproducing the audio information recorded in the above-mentioned DVD audio 200 will be described with reference to FIGS. 8 to 14.

FIG. 8 is a block diagram showing the overall structure of the information reproducing apparatus, FIG. 9 is a block diagram showing the detailed structure of the audio decoder, and FIGS. 10 to 13 are operations of the information reproducing apparatus of the embodiment. FIG. 14 is a flowchart for explaining the operation of time search reproduction.

Further, in the information reproducing apparatus of the embodiments described below, in addition to reproducing the audio information recorded on the DVD audio 200 as usual, the forward search pointer 242e or the backward search pointer 242f according to the present invention is also used. Fast-reverse playback using (i.e., using the forward search pointer 242e, jump to an audio frame to be played 1 second before and play it for a predetermined time (for example, 0.2 seconds), and play back 1 second before Reproduction by repeatedly jumping to an audio frame to be reproduced) or fast-forward reproduction (that is, using the backward search pointer 242f, jump to an audio frame to be reproduced after one second and reproduce it for the predetermined time, and Repeatedly jump to the audio frame to be played after 1 second. Play) or, and can the so-called time search reproduction for reproducing by jumping to specify in advance an audio frame to be reproduced. First, the overall configuration and operation of the information reproducing apparatus according to the embodiment will be described with reference to FIGS. 8 and 9.

As shown in FIG. 8, the information reproducing apparatus S according to the embodiment has a pickup 80 as a detection means, a first detection means and a second detection means, a demodulation correction section 81, and stream switches 82 and 84. , Track buffer 83
, System buffer 85, and demultiplexer 86
An audio buffer 92, an audio decoder 93 as a reproducing means, and an audio decoder buffer 9
4 and RTI (Real Time Information) buffer 9
5, an RTI decoder 96, an RTI decoder buffer 97, an input unit 98, a display 99, a system controller 100 as a control unit and a search unit,
Drive controller 101 and spindle motor 10
2 and a slider motor 103.

Further, as shown in FIG. 9, the audio decoder 93 includes a signal processing unit 12 including a digital filter and the like.
0, a D / A converter 121, an analog output circuit 122 including an amplifier and the like, a digital output circuit 123,
The system microcomputer 124 includes a RAM 124a and a clock circuit 125.

The configuration shown in FIGS. 8 and 9 describes only the portion of the information reproducing apparatus S relating to the reproduction of audio information. The pickup 80, the spindle motor 102, the slider motor 103, etc. are servo-controlled. Since the servo circuit and the like for performing the same are the same as those of the conventional technique, description and detailed description thereof will be omitted.

Next, the operation will be described.

The pickup 80 includes a laser diode, a beam splitter, an objective lens, a photodetector, etc., which are not shown, and irradiates the DVD audio 200 with the light beam B as reproduction light, and at the same time, the DV of the light beam B
The reflected light from the D audio 200 is received, and the detection signal Sp corresponding to the information pit formed on the DVD audio 200 is output. At this time, the light beam B is DV
Tracking servo control is performed on an objective lens (not shown) by a method similar to the conventional technique so that the information track on the D audio 200 is accurately irradiated and the information recording surface on the DVD audio 200 is accurately focused. And focus servo control is applied.

Next, the detection signal Sp output from the pickup 80 is input to the demodulation correction unit 81, demodulation processing and error correction processing are performed to generate the demodulation signal Sdm, and the stream switch 82 and the system buffer 85 are provided. Is output.

The stream switch 82 to which the demodulated signal Sdm is input is controlled to be opened / closed by the switch signal Ssw1 from the drive controller 101, and when closed, the input demodulated signal Sdm is directly passed to the track buffer 83. Output. On the other hand, when the stream switch 82 is open, the demodulated signal Sdm is not output, and therefore unnecessary information (signal) is not input to the track buffer 83. Next, the track buffer 83 to which the demodulated signal Sdm is input is a FIFO (First In First Ou).
t) A demodulated signal Sdm input by a memory or the like
Is temporarily stored and the stored demodulated signal Sdm is continuously output when the stream switch 84 is closed.

Then, in the stream switch 84 to which the demodulated signal Sdm is continuously input, various buffers in the subsequent stage may overflow in the demultiplexing process in the demultiplexer 86, or conversely empty and the decoding process may be interrupted. The switch signal Ssw2 from the system controller 100 controls the opening / closing so as not to exist.

On the other hand, the system buffer 85 to which the demodulated signal Sdm is inputted in parallel with the track buffer 83 is DV
Management information (AMG202, etc.) regarding all information recorded on the DVD audio 200, which is first detected when the D audio 200 is loaded, or ATS2
The first reproduction control information S by accumulating the ATSI 211 for each 03.
These are output to the system controller 100 as c, and the demodulated signal Sdm is output via the stream switch 84.
In the demultiplexer 86 to which is continuously input, audio information compressed for each audio pack 230 is extracted from the demodulated signal Sdm and output to the audio buffer 92 as the audio signal Sad.

At this time, the demultiplexer 86 extracts the pack header 2 from each audio pack 230 and packet.
40 and the packet header 241 etc. are extracted, and the reproduction control information contained in each is output to the system controller 100 as a header signal Shd. Next, the audio signal Sad
The audio buffer 92 to which is input is composed of a FIFO memory or the like, temporarily stores the input audio signal Sad, and outputs it to the audio decoder 93.

Then, the audio decoder 93 subjects the audio signal Sad to decompression processing and demodulation processing corresponding to variable length compression based on the control signals Shc and Sca output from the system controller 100, and outputs the demodulated audio signal. Output as Sadd to a speaker or the like not shown.

On the other hand, the real-time information such as real-time text is sent from the demultiplexer 86 to the RT.
It is output to the I buffer 95. Then, the real-time information temporarily stored in the RTI buffer 95 is output to the RTI decoder 96 based on the control signal Shc output from the system controller 100, further output to a display not shown, and displays lyrics and the like. Is done.

Note that the sound output is temporarily interrupted (paused) during playback immediately after accessing the desired information.
When it is detected that it is necessary, the system controller 100 outputs a pause signal (not shown) to the audio decoder 93, and the audio decoder 93 temporarily stops the output of the demodulated audio signal Sadd.

Next, a specific process in the audio decoder 93 will be described.

In the processing of the audio decoder 93 described above, the system microcomputer 124 transmits / receives the control signal Sca (including the private header information demodulated by the signal processing unit 120) to / from the system controller 100, and the audio decoder buffer. A clock circuit 125 that generates a clock signal Sclk that serves as a reference clock for processing in the signal processing unit 120 while exchanging information with the 94, a signal processing unit 120 that performs actual decompression processing and demodulation processing, and demodulated. The operation control of the D / A converter 121 which converts audio information into an analog signal and the analog output circuit 122 which performs processing such as amplification on the analog audio information is performed.

Here, the system microcomputer 124 has a RAM 124a inside, and the RAM 124a
The a temporarily stores the audio attribute information supplied from the system controller 100 as a part of the control signal Sca. Then, the system microcomputer 124 uses the RAM 1
The audio attribute information stored in 24 a is referred to, and the contents are referred to by the clock circuit 125 and the signal processing unit 12.
Supply to 0.

More specifically, the system microcomputer 124
Supplies the sampling frequency information in the audio attribute information to the clock circuit 125. Then, the clock circuit 125 including the oscillator supplies the clock signal Sclk corresponding to the instructed sampling frequency to the signal processing unit 120.

In parallel with this, the system microcomputer 124
Supplies the sampling frequency, the number of quantization bits, the number of channels, and the presence / absence of emphasis in the audio attribute information to the signal processing unit 120, and the D / A converter 121
Channel number information is provided.

Further, the system microcomputer 124 supplies the analog output circuit 122 with information such as the amplification degree of the signal of each channel. At this time, the information of the amplification degree for each channel can be included in the audio attribute information and supplied from the system controller 100.

The forward search pointer 242e and the backward search pointer 24 included in the private header are included.
The signal 2f is demodulated by the signal processing unit 120 and is output to the system controller 100 as a control signal Sca via the system microcomputer 124 to be used for fast-return reproduction, fast-forward reproduction, or time search reproduction described later.

On the other hand, the signal processing unit 120 uses the clock signal Sclk from the clock circuit 125, and obtains information such as an encoding method, a sampling frequency and the number of quantization bits corresponding to the variable length compression method obtained from the system microcomputer 124. In accordance with the above, the compressed audio signal supplied from the audio buffer 92 is decompressed, decoded, band-limited, and the like, further de-emphasized according to the presence / absence information of emphasis, and output to the D / A converter 121. Furthermore, the signal processing unit 120 uses the private header 2
42 is also demodulated and supplied as a control signal Sca to the system microcomputer 124.

In parallel with these, the signal processing unit 120
The digital audio signal Sadd is output to the outside through the digital output circuit 123.

Then, the D / A converter 121 follows the channel information obtained from the system microcomputer 124.
The input signal is divided for each channel, and the analog output circuit 122 is used as an analog signal for each channel.
Output to.

Next, the detailed processing of the fast-reverse reproduction, the fast-forward reproduction and the time search reproduction, which is executed in the information reproducing apparatus S described above, using the forward search pointer 242e or the backward search pointer 242f in the private header 242 will be described. This will be described with reference to FIGS.

First, the fast-forward reproduction processing will be described with reference to FIG.
This will be described using the flowchart shown in FIG.

In the fast-forward reproduction in the information reproducing apparatus S, first, the address Ac (i) of the audio frame currently being reproduced is acquired (step S30). Here, the parameter i is the forward search pointer 242e and the backward search pointer 242 in the information recording device R.
Similar to the case of generating f, this is a parameter indicating the number of the audio pack 230 including the audio frame currently being reproduced.

Next, the backward search pointer 242f in the private header 242 is detected by the system microcomputer 124 to obtain the relative address An (i) on the DVD audio 200 of the audio pack to be reproduced one second later ( Step S31).

Then, all the compressed audio information in the currently reproduced one audio frame is reproduced (step S32), and then it is judged whether or not the value of the acquired address An (i) is "FFh". Yes (step S33).

If the value of the address An (i) is "FFh" in the determination of step S33 (step S3).
3; T), it is assumed that the audio frame currently being reproduced is an audio frame to be reproduced one second before the end of one AOB 210, and the next succeeding one without using the backward search pointer 242f. Whether or not there is another cell 220 is AMG which is management information.
202, the management information in the ATSI 211 is referred to for confirmation (step S35), and when there is no subsequent cell 220 (step S35; F), the process is terminated because the fast-forward reproduction is no longer possible.

On the other hand, if there is a succeeding cell 220 in the judgment of step S35 (step S36), the address Acs of the starting position of the succeeding cell 220 is referred to, for example, by referring to the management information in the AMG 202 and ATSI 211. After acquiring (step S36), the acquired address Acs is searched (step S37), and the process returns to step S30 to perform fast-forward reproduction with the searched address Acs as a starting point.

If the value of the address An (i) is not "FFh" in the determination in step S33 (step S33; F), the reproduction is performed 1 second later in the AOB 210 to which the currently reproduced audio frame belongs. Backward search pointer 24
2f is used and the address to be searched next (Ac (i) + An
(i)) is searched (step S34), and the process returns to step S30 to perform fast-forward reproduction starting from the searched address (Ac (i) + An (i)).

From the above processing, the backward search pointer 24
Fast-forward playback using 2f is executed.

Next, FIG. 11 shows the processing of the fast rewind reproduction.
This will be described with reference to the flowchart shown in.

In the fast reverse reproduction in the information reproducing apparatus S, first, as in the case of the fast forward reproduction, the address Ac (i) of the currently reproduced audio frame is acquired (step S30).

Next, the forward search pointer 242e in the private header 242 is detected by the system microcomputer 124 to obtain the relative address Ap (i) on the DVD audio 200 of the audio pack to be reproduced one second before. (Step S38).

Then, all the compressed audio information in the currently reproduced one audio frame is reproduced (step S39), and then it is judged whether or not the value of the acquired address Ap (i) is "FFh". Yes (step S40).

When the value of the address Ap (i) is "FFh" in the determination of step S40 (step S4)
0; T), assuming that the audio frame currently being reproduced is an audio frame to be reproduced 1 second after the beginning of one AOB 210, the forward search pointer 2
Without using 42e, it is then determined whether there is another cell 220 played immediately before, eg AMG2.
02, the management information in the ATSI 211 is referred to for confirmation (step S42), and if there is no cell 220 reproduced immediately before (step S42; F), the processing is terminated because it is no longer possible to perform the fast-reverse reproduction.

On the other hand, if it is determined in step S42 that there is a cell 220 reproduced immediately before (step S4
2), the final address of the cell 220 reproduced immediately before (in other words, the start address of the final audio frame in the reproduced cell 220) Ace is, for example, AM
It is acquired by referring to the management information in G202 and ATSI211 (step S43), and the acquired address A
ce is searched (step S44), and fast rewind reproduction is performed from the searched address Ace as a starting point in step S3.
Return to 0.

In the process of step S43,
Since the final address of the cell 220 reproduced immediately before is not described in the DVD audio 200, in the actual processing, first, the cell 22 reproduced immediately before is read.
It jumps to an address obtained by subtracting the maximum value of the size of the audio frame from the final address of 0 itself, and recognizes the beginning of the audio frame detected first after that position as the final address of the cell 220 reproduced immediately before. Will be done.

If it is determined in step S40 that the value of the address Ap (i) is not "FFh" (step S40; F), it is reproduced one second before in the AOB 210 to which the currently reproduced audio frame belongs. If there is another audio frame, the forward search pointer 2
42e, the address to be searched next (Ac (i) -A
p (i)) is searched (step S41), and the process returns to step S30 in order to perform the fast-rewind reproduction starting from the searched address (Ac (i) -Ap (i)).

From the above processing, the forward search pointer 24
Fast-reverse playback using 2e is executed.

Finally, with respect to the time search reproduction processing, the flowcharts shown in FIGS. 12 and 13 and FIG.
Will be explained.

The time search reproduction is an arbitrary reproduction start position specified by the system controller 100, a track number (song number) specified by the viewer through the remote controller or the input unit 98, and an elapsed time from the beginning of the track. That is, the reproduction is performed from the position corresponding to (for example, 1 minute after the beginning of the 10th track).

In the following time search reproduction, it is assumed that reproduction is started from the audio frame at the position of the search time ts on the track 260 corresponding to the nth piece of music.

In the time search reproduction in the information reproducing apparatus S, first, the head P of the nth track 260 is
Tfac which is TS (see FIG. 14) and the total playback time tp
(See FIG. 14) is obtained by referring to the management information in the AMG 202 and the management information in the ATSI 211 (step S50). Note that a specific method of obtaining these PTSs and the total playback time is well known in players that play back so-called DVD video, and therefore description thereof is omitted.

Here, the PTS is time information indicating the reproduction time on the reproduction time axis at which each audio frame should be output from a speaker or the like, and is described for each packet header 241 and also for each ATSI 211. The start value of the track is described. Next, the nth track 2
Address A indicating the start position of the first cell 220 in 60
Similarly, for example, AT
It is acquired by referring to the management information and the like in SI211 (step S51).

Then, the expected address Aa (see FIG. 14) after the elapse of the search time ts is calculated by the formula shown in FIG. 12 (step S52).

Next, the first packet among the packets to be reproduced after the calculated address Aa is searched (step S53), and the PTS in the packet is tp
It is detected as ts (see FIG. 14) (step S54).

Then, assuming that the relationship between the reproduction time and the reproduction data amount on the nth track 260 changes linearly, the nth track 260 concerned.
It is determined whether or not the error between the elapsed time (tpts-tfac) and the search time ts is within 10 seconds (step S55).

When the difference between the elapsed time (tpts-tfac) and the search time ts is within 10 seconds (step S55; T) in the determination of step S55, among the packets to be reproduced after the address Aa. Assuming that the first packet is close to the search time ts, next time search reproduction is performed using the forward search pointer 242e and the backward search pointer 242f (step S59), and the process is terminated. The operation of step S59 will be described later in detail.

Here, the time of 10 seconds used as the threshold value in the determination of step S55 is calculated on the assumption that the relationship between the reproduction time and the reproduction data amount in the nth track 259 changes linearly. , The time search reproduction is performed using the forward search pointer 242e and the backward search pointer 242f rather than the time search reproduction in which the error is detected and the address is calculated again by using the assumption that the linear function is changed again. In this case, the search time ts is set as a time at which the search can be performed more quickly.

On the other hand, in the determination in step S55, the error between the elapsed time (tpts-tfac) and the search time ts is 10.
When it is not within the second (step S55; F), next, the magnitude relation between the elapsed time (tpts-tfac) and the search time ts is determined (step S56), and the elapsed time (tpts-tfac).
Is larger than the search time ts (step S
56; T), assuming that the first packet of the packets to be reproduced after the address Aa is located after the packet corresponding to the search time ts, the new address Aa is set by using the formula shown in FIG. By calculating, the search position is corrected in the direction of returning forward in time (step S
58), the process returns to step S53 again and a new address A
Repeat the above process starting from a.

Further, in the judgment of step S56, when the elapsed time (tpts-tfac) is shorter than the search time ts (step S56; F), the first packet among the packets to be reproduced after the address Aa. Assuming that the packet is located before the packet corresponding to the search time ts, the search position is corrected in the direction of returning backward by calculating a new address Aa using the formula shown in FIG. (Step S57), the process returns to step S53 again, and the processing up to this point is repeated starting from the new address Aa.

Next, the process of step S59 will be described in detail with reference to FIG.

In the process of step S59, first, it is determined whether the elapsed time (tpts-tfac) is equal to the search time ts, that is, the first packet among the packets to be reproduced after the address Aa is the search time. It is determined whether or not it matches the packet corresponding to ts (step S60), and if they match (step S60;
T), the reproduction is performed as it is (step S68), and the time search is ended.

On the other hand, when it is determined in step S60 that the elapsed time (tpts-tfac) is not equal to the search time ts (step S60; F), then the elapsed time (tpts-t)
(tfac) is compared with the search time ts (step S61), and when the elapsed time (tpts-tfac) is longer than the search time ts (step S61; T), it should be reproduced after the address Aa. Assuming that the first packet of the packets is located after the packet corresponding to the search time ts, then the forward search pointer 24
2e is used to jump to the beginning of the audio pack containing the audio frame to be played one second ago (step S66), and then the PTS (ie, tpts) of the packet corresponding to the jumped audio pack is passed. It is determined whether or not the time (tpts-tfac) is less than or equal to the search time ts (step S69), and the search time t
When the time is less than s (step S69; T), the process proceeds to step S68 because the reproduction can be started from the timing substantially matching the search time ts even if the reproduction is started as it is, while the time is not less than the search time ts. (Step S69; F), the process returns to step S66 again to perform a jump using the forward search pointer 242e.

Next, when the elapsed time (tpts-tfac) is not longer than the search time ts in the determination of step S61 (step S61; F), among the packets to be reproduced after the address Aa. Assuming that the first packet is positioned before the packet corresponding to the search time ts, the backward search pointer 242f is used to jump to the audio frame to be played one second later (step S62), and again. Elapsed time (tpts− tfa
It is determined whether or not c) is equal to the search time ts (step S63), and when they are equal (step S63;
T) The process directly proceeds to step S68, and when they are not equal (step S63; F), the elapsed time (tpts
-Tfac) and the search time ts are compared (step S64), and when the elapsed time (tpts-tfac) is longer than the search time ts (step S64; T), the forward search is performed in the same manner as step S66. The pointer 242e is used to jump to the audio frame to be reproduced one second before (step S65), and the reproduction is started from the address position (step S68).

When the elapsed time (tpts-tfac) is not longer than the search time ts in the determination in step S64 (step S64; F), the first packet to be reproduced after the address Aa. It is assumed that the packet of is located before the packet corresponding to the search time ts, and the process returns to step S62.

By the processing described above, time search reproduction using the forward search pointer 242e and the backward search pointer 242f is executed.

As described above, according to the DVD audio 200 and the information recording apparatus R of the embodiment, the forward search pointer 242e and the backward search pointer are provided in the private header 242 recorded in the audio pack 230 together with the compressed audio data 243. Since the search pointer 242f is included at least, even when the information amounts of the compressed audio data 243 included in the audio packs 230 are different from each other due to the variable length compression, the forward search pointer 242e is reproduced. By controlling the reproduction using the backward search pointer 242f, it is possible to quickly search the compressed audio data 243 to be reproduced.

Further, since the forward search pointer 242e and the backward search pointer 242f are recorded as relative addresses, the forward search pointer 242e and the backward search pointer 242f can be expressed with the minimum amount of information.

Further, since the forward search pointer 242e and the backward search pointer 242f each indicate an audio pack including an audio frame to be reproduced for about 1 second, during reproduction, the fast forward reproduction can be performed efficiently without impairing the natural listening feeling. It is possible to perform various reproduction controls such as.

Further, according to the operation of the information reproducing apparatus S of the embodiment, it is possible to efficiently perform the fast-forward reproduction, the fast-reverse reproduction and the time search reproduction even when reproducing the variable length compressed audio information.

[0166]

As described above, according to the invention described in claim 1, in the header information recorded together with the compressed audio information in the information unit, the front position information and the rear position information are provided as reproduction control information. Since at least is included, even if the information amount of the compressed audio information included in each information unit is different due to the variable length compression, the front position information or the rear position information is used during reproduction. The compressed audio information can be quickly searched by controlling the reproduction by controlling the reproduction.

Therefore, even when the original audio information is compressed in a variable length and recorded in order to increase the amount of information that can be recorded on the information recording medium and this is reproduced, the partial audio information corresponding to the front position information or the rear position information is converted. By quickly searching for the corresponding partial audio information, for example, fast-forward playback, fast-reverse playback, or playback of the compressed audio information after designating the compressed audio information to be played back becomes possible. The degree of freedom in reproducing information can be improved.

As a result, it is possible to improve the recording capacity of the original audio information by compressing the variable length of the original audio information and recording it while the degree of freedom during reproduction is improved.

According to the invention described in claim 6, since the front position information and the rear position information are recorded in the header information recorded in the information unit together with the compressed audio information,
Even if the amount of compressed audio information included in each information unit differs due to variable length compression,
By controlling the reproduction by using the front position information or the rear position information at the time of reproduction, it is possible to quickly search the compressed audio information.

Therefore, even when the original audio information is variable length compressed and recorded and reproduced in order to increase the amount of information that can be recorded on the information recording medium, the front part audio information or the rear part audio information is quickly searched. By
For example, it is possible to perform fast-forward playback, fast-reverse playback, or to play back the compressed audio information after specifying the compressed audio information to be played in advance, and improve the degree of freedom in playing back the compressed audio information. it can.

As a result, the recording capacity of the original audio information can be improved by compressing and recording the original audio information while variable-length compression is performed while the degree of freedom during reproduction is improved.

According to the fourteenth aspect of the present invention, the previous position information recorded in the information unit together with the compressed audio information is detected and recorded at the position on the information recording medium indicated by the detected previous position information. Since at least a part of the compressed audio information being reproduced and the previous position information recorded together with the reproduced compressed audio information are repeatedly detected, the compressed audio information that is compressed in a variable length can be quickly and quickly. It can be played back.

Therefore, even when the original audio information is compressed in a variable length and recorded in order to increase the amount of information that can be recorded on the information recording medium and is reproduced, the front audio information is quickly retrieved to perform the fast-reverse reproduction. Is possible,
The degree of freedom in reproducing the compressed audio information can be improved.

As a result, the recording capacity of the original audio information can be improved by compressing and recording the original audio information with variable length while improving the degree of freedom during reproduction.

According to the fifteenth aspect of the present invention, the rear position information recorded in the information unit together with the compressed audio information is detected and recorded at the position on the information recording medium indicated by the detected rear position information. Since at least a part of the compressed audio information being reproduced is detected and the post-position information recorded together with the reproduced compressed audio information is repeated, the compressed audio information which has been compressed in a variable length is rapidly forwarded. Can be played.

Therefore, even when the original audio information is compressed in a variable length and recorded in order to increase the amount of information that can be recorded on the information recording medium and then reproduced, fast-forward reproduction can be performed by quickly searching the rear audio information. Is possible,
The degree of freedom in reproducing the compressed audio information can be improved.

As a result, it is possible to improve the recording capacity of the original audio information by compressing the variable length of the original audio information and recording it while improving the degree of freedom during reproduction.

[Brief description of drawings]

FIG. 1 is a diagram showing a physical format of a DVD audio according to an embodiment.

2A and 2B are diagrams showing a physical format of a header or data, FIG. 2A is a diagram illustrating a physical format of a packet header, FIG. 2B is a diagram showing a physical format of a private header, and FIG. [Fig. 4] is a diagram illustrating a physical format of compressed audio data.

FIG. 3 is a diagram showing a logical format of DVD audio of the embodiment.

FIG. 4 is a block diagram showing a schematic configuration of an information recording device.

FIG. 5 is a flowchart showing an information recording process of the embodiment.

FIG. 6 is a flowchart showing a process of acquiring a forward search pointer.

FIG. 7 is a flowchart showing a process of acquiring a backward search pointer.

FIG. 8 is a block diagram showing a schematic configuration of an information reproducing apparatus.

FIG. 9 is a block diagram showing a schematic configuration of an audio decoder.

FIG. 10 is a flowchart showing processing during fast-forward reproduction.

FIG. 11 is a flowchart showing processing during fast-reverse reproduction.

FIG. 12 is a flowchart (I) showing a process of time search reproduction.

FIG. 13 is a flowchart (II) showing processing of time search reproduction.

FIG. 14 is a diagram illustrating a process of time search reproduction.

[Explanation of symbols]

70 ... Master tape reproducing unit 71 ... Memory 72 ... Signal processing unit 73, 74 ... Hard disk device 75 ... Controller 76 ... Multiplexer 77 ... Modulator 78 ... Mastering device 80 ... Pickup 81 ... Demodulation correction unit 82, 84 ... Stream switch 83 Track buffer 85 System buffer 86 Demultiplexer 92 Audio buffer 93 Audio decoder 94 Audio decoder buffer 95 RTI buffer 96 RTI decoder 97 RTI decoder buffer 98 Input unit 99 Display 100 System controller 100a Memory 101 ... Drive controller 102 ... Spindle motor 103 ... Slider motor 120 ... Signal processing unit 121 ... D / A converter 122 ... Analog output circuit 123 ... Digital output circuit 1 4 ... System microcomputer 124a ... RAM 125 ... Clock circuit 200 ... DVD audio 200 '... Audio zone 200 "... Other zone 201 ... UDF 202 ... AMG 203 ... ATS 204 ... SAPPT 210 ... AOB 211 ... ATSI 220 ... Cell 230 ... Audio pack 240 ... Pack header 241 ... Packet header 241a ... Start code 241b ... Stream identification data 241c ... Packet length data 241d ... Copy control information 241e ... PTS 242 ... Private header 242a ... Stream identification data 242b, 242g ... Spare data area 242c ... Private data Header length data 242d ... First access unit pointer 242e ... Forward search pointer 242f ... Rearward search pointer 242h Stuffing bytes 243 ... compressed audio data _{243 n-1, 243 n,} 243 n + 1 ... access knit 259 ... Index 260 ... track 261 ... title 262 ... title group 263 ... volume R ... information recording apparatus S ... Information reproducing apparatus T ... Leading data Tt ... Time code R ... Audio information B ... Light beam LI ... Lead-in area LO ... Lead-out area ST ... Cue sheet Sr ... Compressed signals Si, Snav ... Control information signal Sa ... Additional information signal Scc ... Information selection signal Sm ... Disk recording signal Sap ... Information addition compression signal Sp ... Detection signal Sdm ... Demodulation signal Ssw1, Ssw2 ... Switch signal Sin ... Input signal Sdp ... Display signal Sc, Shc, Sca ... Control signal Shd ... Header signal Sad ... Audio signal Sadd ... Demodulated audio signal

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G11B 27/10 G10L 9/18 MF term (reference) 5D044 AB05 BC03 CC06 DE38 DE39 DE53 EF05 FG19 FG23 GK08 5D045 DA20 5D077 AA23 BA04 BA09 BA15 BA26 CA02 DC03 DC08 EA01 5D110 AA15 AA27 DA03 DA06 DA17 DA18 DB05 DE01

Claims (17)

[Claims] 1. An information recording in which recording information is recorded which is composed of information units each containing partial audio information obtained by dividing compressed audio information obtained by variable length compression of original audio information. In the medium, the information unit includes header information and head data which is the compressed audio information arranged at the head of one or more of the partial audio information, and the header information includes: Play time control information indicating a time at which the partial audio information to which the first head data of the head data included in the information unit belongs together with the header information, and the information including the header information 1200 counting from the partial audio information included at the beginning of the unit
Previous position information indicating a position on the information recording medium in which the partial audio information to be reproduced earlier on the reproduction time axis of the compressed audio information only for the partial audio information is recorded, and the header information. 1200 counted from the partial audio information included at the beginning of the information unit including
And at least rear position information indicating a position on the information recording medium on which the partial audio information to be reproduced later on the reproduction time axis is recorded. Characteristic information recording medium. 2. The information recording medium according to claim 1, wherein the front position information is 12 with respect to a position on the information recording medium of the information unit in which the front position information is recorded.
The rear position information is relative position information indicating the position on the information recording medium of the information unit in which the head data to be reproduced before only the 00 pieces of the partial audio information is recorded. 12 with respect to the position on the information recording medium of the information unit in which rear position information is recorded,
An information recording medium, which is relative position information indicating a position on the information recording medium of the information unit in which the head data to be reproduced after only 00 pieces of the partial audio information is recorded. 3. The information recording medium according to claim 1, wherein the recording information is recorded on the information recording medium in a physical hierarchical structure having the information unit as a lowest layer. An information recording medium characterized by: 4. The information recording medium according to claim 3, wherein management information, which is reproduction control information related to the entire compressed audio information, is recorded at the head of the recording information corresponding to the uppermost layer in the hierarchical structure. An information recording medium characterized by being present. 5. The information recording medium according to claim 4, wherein the compressed audio information is composed of one or a plurality of pieces of music information, and the management information searches the compressed audio information in units of the music information. The information recording medium, which contains at least the music piece address information and the music piece reproduction time information indicating a reproduction time when the compressed audio information is reproduced in units of the music piece information. 6. Recording information, which is an information unit obtained by dividing compressed audio information obtained by variable-length compression of original audio information, and is composed of information units including at least compressed audio information and header information. An information recording device for recording the information on an information recording medium, wherein reproduction control information generating means for generating reproduction control information used when reproducing compressed audio information included in the information unit together with the header information; 1200 counted from the partial audio information included at the beginning of the information unit including
Pre-position for generating pre-position information indicating a position on the information recording medium in which the partial audio information to be reproduced before is recorded on the reproduction time axis of the compressed audio information for only the partial audio information. 1200 counting from the information generating means and the partial audio information included at the beginning of the information unit including the header information
Rear position information generating means for generating rear position information indicating a position on the information recording medium in which the partial audio information to be reproduced later is recorded on the reproduction time axis only for the partial audio information. An information recording device, comprising: recording means for recording the reproduction control information, the front position information, and the rear position information, which are respectively generated, on the information recording medium as the header information. 7. The information recording apparatus according to claim 6, wherein the recording medium is a stamper disk. 8. The information recording apparatus according to claim 7, further comprising a replication device that manufactures a replica disc using the stamper disc. 9. An information recording medium recorded by the information recording device according to claim 6. 10. Record information, which is an information unit obtained by dividing compressed audio information obtained by variable-length-compressing original audio information, the information unit including at least compressed audio information and header information. And a reproduction control information generating step of generating reproduction control information used when reproducing compressed audio information included in the information unit together with the header information, the information recording method comprising: 1200 counted from the partial audio information included at the beginning of the information unit including
Pre-position for generating pre-position information indicating a position on the information recording medium in which the partial audio information to be reproduced before is recorded on the reproduction time axis of the compressed audio information for only the partial audio information. 1200 from the information generation step and the partial audio information included at the beginning of the information unit including the header information
A rear position information generating step of generating rear position information indicating a position on the information recording medium in which the partial audio information to be reproduced later only on the partial audio information for the number of pieces is recorded. A recording step of recording the reproduction control information, the front position information, and the rear position information respectively generated as the header information on the information recording medium, the information recording method. 11. The information recording method according to claim 10, wherein the recording medium is a stamper disk. 12. The information recording method according to claim 11, further comprising a replication step of manufacturing a replica disk using the stamper disk. 13. An information recording medium recorded by the information recording method according to claim 10. 14. An information reproducing apparatus for reproducing the compressed audio information from the information recording medium according to claim 1, wherein the detecting unit detects the previous position information, and the information indicated by the detected previous position information. Reproducing means for reproducing at least a part of the compressed audio information recorded at a position on the recording medium; and a new position information recorded in the information unit containing the reproduced compressed audio information. And the reproduction of at least a part of the compressed audio information recorded at the position on the information recording medium indicated by the new front position information, and the reproduction is repeated. An information reproducing apparatus comprising: a control unit that controls the reproducing unit. 15. The information reproducing apparatus for reproducing the compressed audio information from the information recording medium according to claim 1, wherein the detecting unit detects the rear position information, and the information indicated by the detected rear position information. Reproducing means for reproducing at least a part of the compressed audio information recorded at the position on the recording medium, and a rear position information recorded in the information unit containing the reproduced compressed audio information. The rear end position information, and at least a part of the compressed audio information recorded at the position on the information recording medium indicated by the new rear position information is reproduced so as to be repeated. An information reproducing apparatus comprising: a control unit that controls the reproducing unit. 16. An information reproducing method for reproducing the compressed audio information from the information recording medium according to claim 1, wherein a detecting step of detecting the previous position information, and the information indicated by the detected previous position information. A reproducing step of reproducing at least a part of the compressed audio information recorded at the position on the recording medium, and a step of newly updating the previous position information recorded in the information unit including the reproduced compressed audio information. And the reproduction of at least a part of the compressed audio information recorded at the position on the information recording medium indicated by the new front position information, and the reproduction is repeated. An information reproducing method comprising: a control step of controlling a reproducing means. 17. An information reproducing method for reproducing the compressed audio information from the information recording medium according to claim 1, wherein the detecting step of detecting the rear position information, and the information indicated by the detected rear position information. A reproducing step of reproducing at least a part of the compressed audio information recorded at the position on the recording medium, and a rear position information recorded in the information unit including the reproduced compressed audio information is newly updated. The rear end position information, and at least a part of the compressed audio information recorded at the position on the information recording medium indicated by the new rear position information is reproduced so as to be repeated. An information reproducing method comprising: a control step of controlling a reproducing means.