JP2009087415A - Recording method, recorder, recording and reproduction method and recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To record and reproduce continuous data by using a single optical pickup and accelerating a transfer speed over an entire CAV (Constant Angular Velocity) type optical disk. <P>SOLUTION: Encoded data read from a buffer memory are recorded in the innermost circumferential area #1 of an optical disk rotating at a constant rotational speed with 0. 4 X speed for a fixed period of time, and subsequently recorded in the outermost circumferential area #n with 1. 0 X speed for a fixed period of time after making the optical pickup seek the outermost circumferential area #n. After that, the encoded data are recorded in a divided area #2 for a fixed period of time after making the optical pickup seek the divided area #2 of an inner circumferential side, and the encoded data are continuously recorded in a divided area #n-1 for a fixed period of time after making the optical pickup seek the divided area #n-1 of an outer circumferential area. Hereinafter, like the above, the encoded data are intermittently and alternately recorded at inner circumferential sides and outer circumferential sides. Consequently, an average transfer speed is higher than that of the innermost circumferential area by 0. 4 X speed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a recording method, a recording apparatus, a recording / reproducing method, and a recording / reproducing apparatus, and more particularly, a CAV (Constant Angular Velocity; The present invention relates to a recording method, a recording apparatus, a recording / reproducing method, and a recording / reproducing apparatus.

  Conventionally, as a main rotation control method at the time of recording / reproducing of a disk medium, a CAV system in which the disk medium is rotated at a constant rotation number, and a CLV in which the disk medium is rotated so that the relative linear velocity between the pickup and the disk medium is constant. (Constant Linear Velocity) method.

  Among them, the CLV method can make the recording / reproducing rate constant, and the recording density is constant over the entire surface from the inner periphery to the outer periphery of the disk medium, so that the recording capacity of the disk medium can be increased. There is a feature. For this reason, the CLV system is adopted for optical disks such as CD (Compact Disk), DVD (Digital Versatile Disk), and BD (Blu-Ray Disk). However, since the relative linear velocity between the pickup and the disk medium is constant in the CLV system, the disk medium is rotated at a high speed on the inner periphery of the disk medium, and gradually decelerated toward the outer periphery to rotate at a low speed. Requires rotation control.

  On the other hand, the CAV method is a method of rotating a disk medium at a constant speed (a constant rotation speed) without performing rotation control as in the CLV method. For this reason, in the CAV system, the linear velocity of the outer periphery is higher than the inner periphery of the disk medium, and the transfer rate can be increased toward the outer periphery. For this reason, when an optical disk such as a CD, DVD, or BD is used as an external storage device of a computer, the average transfer speed is improved by recording / reproducing by CAV rotation control.

  However, in general, in the CAV method, the transfer speed (recording / reproduction rate) on the inner circumference is about 2/5 as compared with the outer circumference, and the transfer speed cannot be made uniform over the entire surface of the disk medium. For example, when recording / reproducing encoded data of a video signal on an optical disk by the CAV method, the transfer speed increases from the innermost circumference to the outer circumference of the optical disk. It is necessary to limit the maximum encoding speed of the encoded data of the video signal. For this reason, there is a possibility that the reproduction image quality is deteriorated due to the limitation of the maximum encoding speed in the recording / reproduction on the innermost circumference of the optical disc.

  To solve this problem, “a first head for recording / reproducing data on the first surface of an optical disk having recording tracks composed of a plurality of sectors on the front and back sides, and recording / reproducing data on the second surface of the optical disk. The logical address is set to one sector or a plurality of sectors for the second head and the first side sector from the recording track on the inner circumference side, and the logical address is set to one sector or a plurality of sectors for the second side sector. And a control means for alternately assigning logical addresses to the respective surfaces from the recording track on the outer peripheral side in units and rearranging the recording / reproducing data from the first head and the second head in the order of the logical addresses. Thus, a method for increasing the transfer speed over the entire surface of a disk medium to be recorded / reproduced by the CAV method has been conventionally disclosed (for example, see Patent Document 1).

  In addition, when recording on a CAV optical disc, dummy data is written in a predetermined area on the inner periphery, and the outer peripheral area where the outer transfer speed is higher than a predetermined transfer speed is used as the effective data recording / reproducing area. A method for increasing the speed is also known in the art (see, for example, Patent Document 2).

JP-A-6-605666 JP 11-338645 A

  However, since the conventional method described in Patent Document 1 requires two optical heads, the cost is higher than that of an optical disk reproducing apparatus composed of one optical head. This requires a control for rearranging the reproduction data in the order of logical addresses and outputting it as continuous reproduction data, and the problem is that the configuration and control become complicated. Furthermore, in the conventional method described in Patent Document 1, since two optical heads perform data recording / reproduction with respect to each of the front surface and the back surface of the optical disk, a single-layer optical disk having one recording layer is used. There is also a problem that cannot be applied.

  Further, in the conventional method described in Patent Document 2, a predetermined area on the inner periphery in which dummy data is written is not used for recording / reproducing effective data, so that it is a problem that the effective storage capacity of the optical disk medium is reduced.

  The present invention has been made in view of the above points, and a recording method capable of recording and reproducing continuous data at a high transfer speed over the entire surface of a CAV optical disk using a single optical pickup, It is an object to provide a recording apparatus, a recording / reproducing method, and a recording / reproducing apparatus.

In order to achieve the above object, the recording method of the present invention is a recording method for recording desired continuous information on an optical disk rotating at a constant rotational speed using a single optical pickup.
Of the n divided areas obtained by dividing the recording area of the optical disk into n (n is a natural number of 4 or more), the first portion of the desired information is recorded in the first divided area set in advance first. After recording in the first divided area and the first divided area, the optical pickup is moved to the second divided area on the inner peripheral side (or outer peripheral side) of the first divided area, and desired information is After the second portion of the information is recorded, the optical pickup is moved to the third divided region on the outer peripheral side (or the inner peripheral side) of the second divided region, and the third portion of the desired information is moved. Recording, and subsequently repeating the recording of the fourth portion of the desired information by moving the optical pickup to the fourth divided region on the inner peripheral side (or outer peripheral side) of the third divided region. Each of n or less divided areas by alternately reciprocating the optical pickup. Wherein the sequentially record each part of the desired information.

In order to achieve the above object, the recording apparatus of the present invention is a recording apparatus for recording desired continuous information on an optical disk rotating at a constant rotational speed using a single optical pickup.
Temporary storage means for temporarily storing desired information and an optical pickup is moved to an arbitrary divided area among n divided areas obtained by dividing the recording area of the optical disk into n (n is a natural number of 4 or more). , A moving means for recording a part of desired information for the arbitrary divided area, and a moving means and a temporary storage means for controlling the desired information in the first divided area set in advance The first part of the information is recorded, and after recording on the first divided area, the optical pickup is moved to the second divided area on the inner peripheral side (or outer peripheral side) of the first divided area. After recording the second part of the desired information, the optical pickup is moved to the third divided area on the outer peripheral side (or inner peripheral side) of the second divided area, and the desired information Record the third part, then the inner circumference side (or outer circumference side) of the third divided area The optical pickup is moved to the fourth divided area and the fourth portion of the desired information is recorded, and each portion of the desired information is placed in each of the n or less divided areas. And recording control means for sequentially recording.

  In the recording method and recording apparatus of the present invention, when recording desired continuous information on an optical disk rotating at a constant rotational speed using a single optical pickup, the optical pickup is reciprocated to make n divisions. Of the areas, the recording of a part of the desired recording information in the divided area on the inner circumference side and the recording of a part of the desired recording information in the divided area on the outer circumference side are alternately repeated to obtain n pieces It is possible to record each portion of the desired recording information in each of the following divided areas sequentially at a substantially uniform transfer rate.

In addition, in order to achieve the above object, the recording / reproducing method of the present invention records desired information continuously recorded on an optical disk rotating at a constant rotational speed using a single optical pickup. In a recording / reproducing method for reproducing information from an optical disc,
Of the n divided areas obtained by dividing the recording area of the optical disk into n (n is a natural number of 4 or more), the first portion of the desired information is recorded in the first divided area set in advance first. After recording in the first divided area and the first divided area, the optical pickup is moved to the second divided area on the inner peripheral side (or outer peripheral side) of the first divided area, and desired information is After the second portion of the information is recorded, the optical pickup is moved to the third divided region on the outer peripheral side (or the inner peripheral side) of the second divided region, and the third portion of the desired information is moved. Recording, and subsequently repeating the recording of the fourth portion of the desired information by moving the optical pickup to the fourth divided region on the inner peripheral side (or outer peripheral side) of the third divided region. 2 and the first and second steps, each of the n or less divided regions has a desired information. The optical pickup is alternately reciprocated in the outer peripheral side direction and the inner peripheral side direction of the optical disc from the optical disc in which the respective portions are sequentially recorded, and the respective portions of the desired information are sequentially reproduced. And a fourth step in which each portion of the desired information reproduced in the third step is temporarily stored and subsequently read out.

In order to achieve the above object, the recording / reproducing apparatus of the present invention records / reproduces desired continuous information on an optical disk rotating at a constant rotational speed using a single optical pickup. In
Temporary storage means for temporarily storing desired recording information and reproduced recording information, and any divided area among n divided areas obtained by dividing the recording area of the optical disk into n (n is a natural number of 4 or more) The optical pickup is moved, moving means for recording or reproducing a part of the desired information with respect to the arbitrary divided area, and the moving means are controlled and the temporary storage means are controlled. The first portion of the desired information is recorded in the set first divided area, and after recording in the first divided area, the first portion on the inner peripheral side (or outer peripheral side) of the first divided area is recorded. After the optical pickup is moved to the second divided area and the second portion of the desired information is recorded, the optical pickup is moved to the third divided area on the outer peripheral side (or inner peripheral side) of the second divided area. To record the third part of the desired information, And repeating the process of recording the fourth portion of the desired information by moving the optical pickup to the fourth divided region on the inner peripheral side (or outer peripheral side) of the third divided region. The recording control means for sequentially recording each part of the desired information in each of the divided areas, the moving means, and the temporary storage means are controlled so that the desired information is first transferred from the first divided area. Of the first divided area, and after the reproduction of the first divided area, the optical pickup is moved to the second divided area on the inner peripheral side (or outer peripheral side) of the first divided area, After reproducing the second part of the information, the optical pickup is moved to the third divided area on the outer peripheral side (or the inner peripheral side) of the second divided area to move the third part of the desired information. Part is played back, then the fourth divided area on the inner circumference side (or outer circumference side) of the third divided area The optical pickup is moved to reproduce the fourth portion of the desired information, and each portion of the desired information is sequentially reproduced from each of the n or less divided areas and temporarily stored. And a reproduction control means for temporarily storing the reproduction information in the apparatus, and reproduction information generation means for obtaining reproduction information by decoding each portion of the reproduced desired information read from the temporary storage means.

  In the recording / reproducing method and the recording / reproducing apparatus of the present invention, when reproducing a desired continuous information on an optical disk rotating at a constant rotational speed using a single optical pickup, the optical pickup is reciprocated to move the optical disk. Of the n divided areas, each portion of the desired recording information is sequentially reproduced from each of the n or less divided areas of the optical disc, and continuous reproduction information can be obtained at a substantially uniform transfer rate. .

  According to the present invention, the recording transfer speed of the optical disk can be made substantially uniform by performing intermittent recording alternately on the inner and outer divided areas of the optical disk by the CAV method. It can be made faster. Further, according to the present invention, the configuration can be simplified as compared with the conventional apparatus using two optical heads, and the entire recording area of the optical disk can be used effectively.

  Next, the best mode of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a block diagram of an embodiment of a recording / reproducing apparatus according to the present invention. In the figure, a recording / reproducing apparatus 100 includes a recording / reproducing unit 110 that records or reproduces an image signal to / from an optical disc 200, a host CPU (Central Processing Unit) 120 that instructs recording / reproduction, etc. The host memory 130 for storing the information, the video codec 140 for encoding the recorded image signal and decoding the reproduced encoded image signal, the host CPU 120, the host memory 130, the video codec 140, and the recording / reproducing unit 110. And a host bus 150 connected in the same direction.

  The recording / reproducing unit 110 is connected to the host interface 111 that interfaces with the host bus 150, the buffer memory 112 that is a temporary storage unit that temporarily stores the encoded image signal, the recording / reproducing control circuit 113, and the optical disc 200. The optical pickup 114 for optically recording the encoded image signal or optically reproducing the encoded image signal recorded on the optical disc 200, and the entire optical pickup 114 are moved in the radial direction of the optical disc 200. And at least a spindle motor 116 that rotates the optical disc 200 at a constant speed (a constant rotation speed). The optical disc 200 is an existing optical disc having specifications for recording and reproducing image signals in the CLV system, and is, for example, a BD. The recording layer of the optical disc 200 may be a single layer or multiple layers.

  In the recording / reproducing unit 110, a focus servo for forming a spot by focusing the light beam irradiated on the optical disc 200 from the optical pickup 114 onto the optical disc 200, and a desired track on the optical disc 200. Conventionally known circuits such as a servo circuit such as a tracking servo for following scanning are also included, but circuit portions not directly related to the operation of the present invention are not shown for convenience.

  Next, an outline of the operation during recording will be described. The optical disk 200 is rotated at a constant speed by the spindle motor 116. The video codec 140 generates an encoded image signal (encoded data) according to a predetermined encoding method for the input recorded image signal based on a recording instruction supplied from the host CPU 120 via the host bus 150, The encoded data is supplied to the recording / reproducing unit 110 via the host bus 150.

  The recording / reproducing unit 110 receives the encoded data as an input by the host interface 110 and temporarily stores the input encoded data in the buffer memory 112 at a constant transfer rate. Subsequently, in the recording / reproducing unit 110, the recording / reproducing control circuit 113 records the divided areas from the buffer memory 112 so as to record the encoded data in a predetermined order in a plurality of divided areas of the optical disc 200, as will be described later. And recording on the optical disc 200 while controlling the position of the optical pickup 114 by driving the optical pickup moving mechanism 115 from the host CPU 120 via the host interface 111.

  In the present invention, a single optical pickup 114 is used to intermittently alternate between an inner peripheral side divided area and an outer peripheral side divided area with respect to the center of the optical disc 200 via the buffer memory 112 by the CAV method. By performing the recording, the recording transfer speed of the optical disc 200 is made substantially uniform to increase the speed. Hereinafter, each embodiment of the present invention will be described in detail.

  FIG. 2 is a diagram for explaining each divided area of the optical disk for explaining a recording information recording procedure according to the present invention. In the figure, the entire recording area of the optical disc 200 is # 1 as the innermost area, # 2, # 3,... As the process proceeds to the outer periphery, and #n as the outermost area. , N division (n is a natural number of 4 or more). Each of the divided areas # 1 to #n is an area for recording recording information for a predetermined time. In the present specification, the innermost peripheral region # 1 is referred to as the innermost peripheral region, and the outermost peripheral region #n is referred to as the outermost peripheral region.

  In the first embodiment of the recording method and the recording apparatus of the present invention, in FIG. 2, recording is first performed on the innermost peripheral area # 1, subsequently recorded on the outermost peripheral area #n, and thereafter the divided area on the inner peripheral side. And the outer divided areas are recorded alternately so as not to overlap toward the center of the optical disc 200. The arrows in FIG. 2 indicate the recording / reproducing direction.

  FIG. 3 shows a flowchart of the first embodiment of the recording method and recording apparatus of the present invention. First, the host CPU 120 in FIG. 1 performs initialization by substituting “1” into the variable i1 and substituting “n” into the variable i2 (step S1). Here, the above “n” is the number of divided areas shown in FIG. Subsequently, after the encoded data read from the buffer memory 112 is recorded in the innermost peripheral area # 1 of the optical disc 200 shown in FIG. 2 by the optical pickup 114 via the recording / reproducing control circuit 113 (step S2), After the optical pickup 114 is sought to the outermost peripheral area #n by the optical pickup moving mechanism 115, the encoded data read from the buffer memory 112 to the outermost peripheral area #n is read via the recording / reproducing control circuit 113. Recording is performed for a certain period of time by 114 (step S3).

  Subsequently, the host CPU 120 increments the variable i1 by “1” (step S4), determines whether or not the variable i1 after the increment is larger than n / 2 (step S5), and if not large, the division for recording is performed. Since the area has not yet reached half, the divided area # i1 (here, # 2) indicated by the variable i1 after the increment, that is, the optical pickup 114 is moved from the innermost circumference to the second outermost side by the optical pickup moving mechanism 115. 2, the encoded data read from the buffer memory 112 for a certain period of time for the divided area # 2 shown in FIG. Record (step S6).

  Subsequently, the host CPU 120 decrements the variable i2 by “1” (step S7), and the divided area # i2 (here, # n−1) indicated by the variable i2 after the decrement, that is, the optical pickup 114 is picked up. After the seek to the divided area # n−1 shown in FIG. 2 on the second inner circumference side from the outermost circumference by the moving mechanism 115, the encoded data read from the buffer memory 112 for a certain period of time for the divided area # n−1 Data is recorded for a certain period by the optical pickup 114 via the recording / reproducing control circuit 113 (step S8).

  Subsequently, the host CPU 120 determines whether or not the decremented variable i2 has reached (n / 2) +1 (step S9), and if not, determines whether the recording has ended (step S10). In step S10, if all the encoded data to be recorded has not been completed or if the recording is not to be stopped, it is determined that the recording has not ended, the process returns to step S4 again, and the processes of steps S5 to S8 are performed. Recording of the divided area # i1 on the inner circumference side and recording of the divided area # i2 on the outer circumference side are alternately performed.

  If n is an even number, if it is determined in step S9 that i2 has reached (n / 2) +1, it is determined that the recording of all the divided areas is complete and the recording is terminated (step S12). If n is an odd number, when the variable i1 is larger than n / 2 in step S5, the encoded data is recorded in the inner divided region # i1 (step S11). The recording is finished (step S12). In this way, recording of each part (part of a certain period) of the encoded data continuous in each of the divided areas # 1 to #n is sequentially performed. If it is determined in step S10 that the recording has been completed even if the recording of all the divided areas is not completed, the recording is terminated (step S12).

  Next, a recording method and a recording apparatus according to a second embodiment of the present invention will be described. In this embodiment, in FIG. 2, recording is first performed on the outermost peripheral area #n, and subsequently recorded on the outermost peripheral area # 1, and thereafter the outer peripheral side divided area and the inner peripheral side divided area with respect to the center are recorded on the optical disc. It records alternately so that it may not overlap toward the center of 200.

  FIG. 4 shows a flowchart of the second embodiment of the recording method and apparatus of the present invention. The host CPU 120 in FIG. 1 first performs initialization by substituting “n” for the variable i1 and substituting “1” for the variable i2 (step S21). Here, the above “n” is the number of divided areas shown in FIG. Subsequently, after the encoded data read from the buffer memory 112 is recorded in the outermost peripheral area #n of the optical disc 200 shown in FIG. 2 by the optical pickup 114 via the recording / reproducing control circuit 113 (step S22), the optical data is recorded. After the pickup 114 is sought to the innermost peripheral area # 1 by the optical pickup moving mechanism 115, the encoded data subsequently read from the buffer memory 112 to the innermost peripheral area # 1 is optically transmitted through the recording / reproducing control circuit 113. Recording is performed for a certain period by the pickup 114 (step S23).

  Subsequently, the host CPU 120 decrements the variable i1 by “1” (step S24), and determines whether the variable i1 after the decrement is smaller than (n / 2) +1 (step S25). Since the divided area to be recorded has not yet reached half, the divided area # i1 (here, # n-1) indicated by the variable i1 after decrement, that is, the optical pickup 114 is moved from the outermost circumference by the optical pickup moving mechanism 115. After seeking to the divided area # n−1 shown in FIG. 2 on the inner circumference side, the encoded data read from the buffer memory 112 for a certain period of time for the divided area # n−1 is recorded in the recording / playback control circuit 113. Is recorded for a certain period by the optical pickup 114 (step S26).

  Subsequently, the host CPU 120 increments the variable i2 by “1” (step S27), and the divided area # i2 (in this case, # 2) indicated by the variable i2 after the increment, that is, the optical pickup 114 is moved to the optical pickup moving mechanism. 115, after seeking the divided area # 2 shown in FIG. 2 on the second outermost side from the innermost circumference, the encoded data read from the buffer memory 112 for the divided area # 2 for a certain period is recorded and reproduced. Recording is performed for a certain period by the optical pickup 114 via the circuit 113 (step S28).

  Subsequently, the host CPU 120 determines whether the incremented variable i2 has reached (n / 2) (step S29), and if not, determines whether the recording has ended (step S30). In step S30, if all the encoded data to be recorded has not been completed or if the recording is not to be stopped, it is determined that the recording has not ended, the process returns to step S24 again, and the processes of steps S25 to S28 are performed. Recording of the outer divided area # i1 and recording of the inner divided area # i2 are alternately performed.

  If n is an even number, if it is determined in step S29 that i2 has reached (n / 2), it is determined that recording of all the divided areas is completed, and the recording ends (step S32). When n is an odd number, after the variable i1 is larger than (n / 2) +1 in step S25, the encoded data is recorded on the outer divided area # i1 (step S25). S31), the recording is finished (step S32). In this way, recording of each portion (fixed period) of encoded data continuous in each of all the divided areas # 1 to #n is sequentially performed. If it is determined in step S30 that the recording has ended even if the recording of all the divided areas has not ended, the recording is ended (step S32).

  As described above, in each of the above-described embodiments, the single optical pickup 114 is alternately moved in the inner peripheral side direction and the outer peripheral side direction of the CAV optical disc 200, and is encoded continuously in each divided region. A part of the data (encoded data for a certain period) is sequentially recorded. Here, assuming that the transfer rates of the outermost peripheral area #n and the innermost peripheral area # 1 are 1.0 times and 0.4 times the standard speed, respectively, the innermost area #n and the innermost area #n. Although the recording / reproducing speed (transfer speed) of the peripheral area # 1 is about 2/5, the average transfer speed can be improved by using the buffer memory 112.

  Here, for example, a standard speed in BD (Blu-ray Disc) is a transfer speed of about 36 Mbps. The linear velocity at this time is 4.917 m / sec, the rotation speed at the innermost circumference at a radius of 24 mm is 810 rotations per minute, and the rotation speed at the outermost circumference at a radius of 58 mm is 1956 rotations per minute. Hereinafter, specific examples of embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 5A is a diagram schematically showing the operation of Example 1 of the first embodiment described with the flowchart of FIG. In the figure, the vertical axis represents the transfer rate, and the horizontal axis represents time. FIG. 5A schematically shows a recording operation when the ratio of the recording time to the seek time is 8: 2, for example, when the recording time is 800 ms and the seek time is 200 ms. That is, as shown in FIG. 5A, the encoded data read from the buffer memory 112 in FIG. 1 is first transmitted by the optical pickup 114 for a period of 800 ms at 0.4 × speed with respect to the innermost peripheral area # 1. After recording, the optical pickup 114 is sought to the outermost peripheral area #n, and then recorded in the outermost peripheral area #n at a 1.0 × speed for a period of 800 ms.

  Subsequently, after seeking the optical pickup 114 to the inner divided area # 2, the above encoded data is recorded in the divided area # 2 for a period of 800 ms. Subsequently, the optical pickup 114 is moved to the outer divided area # 2. After seeking into the divided area # n-1, the coded data is recorded in the divided area # n-1 for a period of 800 ms. Recording is intermittently performed alternately on the divided areas and the outer divided areas. Actually, the seek time becomes shorter as recording progresses. Further, the reading speed of the buffer memory 112 is controlled so as to be the transfer speed at the time of recording. Here, the transfer rates of the outermost peripheral area #n and the innermost peripheral area # 1 are set to 1.0 times speed and 0.4 times speed, respectively, compared to the standard speed.

  As described above, the average transfer speed Va in the case of intermittently alternately recording the inner peripheral divided area and the outer peripheral divided area is the recording time Rt, the seek time St, and the innermost peripheral area transfer speed. Is Vi and the transfer speed of the outermost peripheral region is Vo, it can be expressed by the following equation.

Va = (Vi + Vo) × Rt / [2 × (Rt + St)] (1)
Further, the minimum memory amount B of the buffer memory 112 required for performing the above recording can be expressed by a time expression.

B = (Vo−Va) × Rt (2)
Therefore, in the case of FIG. 5A, since Rt = 800 (ms), St = 200 (ms), Vi = 0.4, and Vo = 1.0, the average transfer rate Va is calculated from the equation (1). The speed is 0.56 times faster than the standard speed. That is, if the transfer speed in the outermost peripheral area is 12.0 times faster than the standard speed, the average transfer speed in FIG. 5A is about 6.7 (= 0.56 × 12.0) times faster. In addition, the minimum memory amount B of the buffer memory 112 required at this time is a memory for 800 ms at a transfer speed of about 5.3 (= 12.0−6.7) times faster than the standard speed based on the equation (2). Amount. That is, about 19 MB (= 36M × 5.3 × 0.8 / 8).

  In this case, the encoded data is written from the buffer memory 112 at the transfer rate schematically shown in FIG. 5A while the encoded data is continuously written to the buffer memory 112 at a transfer rate of 0.56 times. It can be read and recorded.

  Next, a second embodiment of the present invention will be described. FIG. 5B shows an example of the first embodiment of the present invention in which the inner and outer divided areas are intermittently alternately recorded with respect to the center as in the first embodiment. Thus, when the ratio of the recording time to the seek time is 9: 1, for example, the recording operation of Example 2 when the recording time is 1800 ms and the seek time is 200 ms is schematically shown. That is, as shown in FIG. 5B, the encoded data read from the buffer memory 112 in FIG. 1 is first transmitted by the optical pickup 114 for a period of 1800 ms at a speed of 0.4 times with respect to the innermost peripheral area # 1. Then, after the optical pickup 114 seeks to the outermost peripheral area #n, recording is performed for 1.0800 times in the outermost peripheral area #n for a period of 1800 ms.

  Subsequently, after seeking the optical pickup 114 to the inner peripheral side divided area # 2, the above encoded data is recorded in the divided area # 2 for a period of 1800 ms, and then the optical pickup 114 is moved to the outer peripheral side. After seeking into the divided area # n-1, the encoded data is recorded in the divided area # n-1 for a period of 1800 ms. Thereafter, in the same manner as described above, on the inner peripheral side with respect to the center. Recording is intermittently performed alternately on the divided areas and the outer divided areas.

  The average transfer speed Va of this embodiment is 0.63 times the standard speed from the equation (1). That is, if the transfer speed in the outermost peripheral area is 12.0 times faster than the standard speed, the average transfer speed in FIG. 5B is about 7.6 (= 0.63 × 12.0) times faster. Further, the minimum memory amount B of the buffer memory 112 required at this time is a memory amount corresponding to 1000 ms at a transfer speed of about 4.0 times the standard speed from the equation (2).

  As described above, according to the CLV method, the encoded data is recorded at the innermost transfer speed (in the above case, 0.4 times the standard speed) over the entire recording area of the optical disc. While the CAV method is limited by the innermost transfer rate, according to the first and second embodiments, the average transfer rate can be increased compared to the CLV method and the conventional CAV method. In the first and second embodiments, since the optical pickup is single, the configuration can be simplified as compared with the conventional apparatus using two optical heads, and recording can be performed using the entire recording area of the optical disc 200. All of the recording area of the optical disc 200 can be used effectively.

  Next, Embodiment 3 of the present invention will be described. This example is an example of the second embodiment of the present invention described with reference to the flowchart of FIG. 4. First, recording is performed on the outermost peripheral area #n, then recording is performed on the innermost peripheral area # 1, and thereafter the center. On the other hand, the outer divided area and the inner divided area are alternately recorded toward the center of the optical disc 200.

  Here, the transfer rates of the outermost peripheral area #n and the innermost peripheral area # 1 are set to 1.0 times speed and 0.4 times speed, respectively, as compared with the standard speed. Also in this case, the recording / reproducing speed (transfer speed) of the innermost area # 1 is about 2/5 as compared with the outermost area #n, but the average transfer speed can be improved by using the buffer memory 112. .

  FIG. 6A is a diagram schematically illustrating the operation of the third embodiment in which the outer peripheral side divided area and the inner peripheral side divided area are intermittently and alternately recorded in the above-described order. In the figure, the vertical axis represents the transfer rate, and the horizontal axis represents time. FIG. 6A schematically shows the recording operation when the ratio of the recording time to the seek time is 8: 2, for example, when the recording time is 800 ms and the seek time is 200 ms. That is, as shown in FIG. 6 (A), the encoded data read from the buffer memory 112 in FIG. 1 is first recorded by the optical pickup 114 at a speed of 1.0 times with respect to the outermost peripheral area #n for 800 ms. Then, after seeking the optical pickup 114 to the innermost peripheral area # 1, recording is performed for 0.4 ms at a time of 800 ms in the innermost peripheral area # 1.

  Subsequently, after seeking the optical pickup 114 into the outer divided area # n−1, the above encoded data is recorded in the divided area # n−1 for a period of 800 ms. After seeking into the divided area # 2 on the inner circumference side, the above-mentioned encoded data is recorded for a period of 800 ms in the divided area # 2, and thereafter, the division on the outer circumference side with respect to the center is performed as described above. Recording is intermittently performed alternately on the area and the inner divided area. Actually, the seek time becomes shorter as recording progresses. Further, the reading speed of the buffer memory 112 is controlled so as to be the transfer speed at the time of recording.

  In this embodiment, the average transfer speed Va is 0.56 times faster than the standard speed from the equation (1). That is, if the transfer speed in the outermost peripheral area is 12.0 times faster than the standard speed, the average transfer speed in FIG. 6A is about 6.7 (= 0.56 × 12.0) times faster. Further, the minimum memory amount B of the buffer memory 112 required at this time is a memory amount corresponding to 800 ms at a transfer speed of about 5.3 times the standard speed from the formula (2).

  In this case, while the encoded data is continuously written to the buffer memory 112 at a transfer rate of about 6.7 times, the encoded data is transferred to the buffer memory 112 at the transfer rate schematically shown in FIG. Can be read and recorded.

  Next, a fourth embodiment of the present invention will be described. The present example is an example of the second embodiment of the present invention, and FIG. 6B is a diagram schematically showing the operation of the fourth example. In the figure, the vertical axis represents the transfer rate, and the horizontal axis represents time. FIG. 6B schematically shows the recording operation when the ratio between the recording time and the seek time is 9: 1, for example, when the recording time is 1800 ms and the seek time is 200 ms. That is, as shown in FIG. 6 (B), the encoded data read from the buffer memory 112 of FIG. 1 is first recorded by the optical pickup 114 at a 1.0 × speed for 1800 ms with respect to the outermost peripheral area #n. Subsequently, after the optical pickup 114 is sought to the innermost peripheral area # 1, recording is performed in the innermost peripheral area # 1 at a speed of 0.4 times for a period of 1800 ms.

  Thereafter, similarly to the above, recording is intermittently performed alternately on the outer divided area and the inner divided area with respect to the center. Actually, the seek time becomes shorter as recording progresses. Further, the reading speed of the buffer memory 112 is controlled so as to be the transfer speed at the time of recording.

  The average transfer speed Va of this embodiment is 0.63 times the standard speed from the equation (1). That is, if the transfer speed in the outermost peripheral area is 12.0 times faster than the standard speed, the average transfer speed in FIG. 6B is about 7.6 (= 0.63 × 12.0) times faster. Further, the minimum memory amount B of the buffer memory 112 required at this time is a memory of 1800 ms at a transfer speed of about 4.4 (= 12.0-7.6) times faster than the standard speed from the equation (2). Amount.

  In any of the above third and fourth embodiments, the average transfer rate can be increased as compared to the CLV method, as in the first and second embodiments. In the first and second embodiments, since the optical pickup is single, the configuration can be simplified as compared with the conventional apparatus using two optical heads, and recording can be performed using the entire recording area of the optical disc 200. All of the recording area of the optical disc 200 can be used effectively. However, in the third and fourth embodiments, as shown in FIGS. 6A and 6B, compared to the first and second embodiments shown in FIGS. Is the outermost peripheral area #n having the highest transfer rate, and therefore it is necessary to read and record the encoded data from the buffer memory 112 at a high speed of 1.0 times, so that the encoded data in the buffer memory 112 does not become empty. Therefore, it takes time to store the encoded data in the buffer memory 112 to some extent.

  Next, a recording method, a reproducing method and a reproducing apparatus for reproducing recorded information from a recording medium recorded by the recording apparatus will be described. This reproducing apparatus can be realized by the reproducing system of the recording / reproducing apparatus 100 shown in FIG. The reproducing operation of the recording / reproducing apparatus 100 will be described. The optical disk 200 is rotated at a constant speed by the spindle motor 116. The video codec 140 is based on a playback instruction supplied from the host CPU 120 via the host bus 150, and the recording / playback control circuit 113 records codes recorded in a plurality of divided areas of the optical disc 200 in a predetermined order as will be described later. The encoded data is optically reproduced from each divided area of the optical disc 200 while controlling the position of the optical pickup 114 so that the encoded data is reproduced in the recording order, and the reproduced encoded data is supplied to the buffer memory 112. To do.

  The reproduced encoded data once stored in the buffer memory 112 is output to the host bus 150 via the host interface 110 at a constant transfer rate, and further supplied to the video codec 140 for decoding. The reproduced image signal obtained by decoding by the video codec 140 is output to the outside.

  Here, at the time of reproduction, a single optical pickup 114 is used to intermittently divide the inner and outer divided areas with respect to the center of the optical disc 200 through the buffer memory 112 by the CAV method. Thus, the transfer speed of the optical disc 200 is increased by alternately reproducing.

  FIG. 7 shows a flowchart of an example of the playback method and playback device. In this example, according to the first embodiment shown in FIG. 3, recording is first performed in the innermost peripheral area # 1 in FIG. 2, and subsequently recorded in the outermost peripheral area #n. In this example, the encoded data is reproduced from the optical disc 200 in which the encoded data is recorded alternately so that the outer divided area does not overlap toward the center of the optical disc 200.

  In FIG. 7, the host CPU 120 of FIG. 1 first performs initialization by substituting “1” into the variable i1 and substituting “n” into the variable i2 (step S41). Here, the above “n” is the number of divided areas shown in FIG. Subsequently, the optical pickup 114 is sought in the innermost peripheral area # 1 of the optical disc 200 shown in FIG. 2, the encoded data is reproduced from the innermost peripheral area # 1, and the encoded data is recorded in the recording / reproducing control circuit 113. After the optical pickup 114 is seeked to the outermost peripheral area #n by the optical pickup moving mechanism 115, the encoded data is read from the outermost peripheral area #n. The encoded data is supplied to the buffer memory 112 via the recording / reproduction control circuit 113 and temporarily stored (step S43).

  Subsequently, the host CPU 120 increments the variable i1 by “1” (step S44), determines whether or not the variable i1 after the increment is larger than n / 2 (step S45). Since the area has not yet reached half, the divided area # i1 (here, # 2) indicated by the variable i1 after the increment, that is, the optical pickup 114 is moved from the innermost circumference to the second outermost side by the optical pickup moving mechanism 115. 2, the encoded data is reproduced from the divided area # 2, and the encoded data is supplied to the buffer memory 112 via the recording / reproducing control circuit 113 and temporarily stored. (Step S46).

  Subsequently, the host CPU 120 decrements the variable i2 by “1” (step S47), and the divided area # i2 (here, # n−1) indicated by the variable i2 after the decrement, that is, the optical pickup 114 is optically picked up. After the seek to the divided area # n-1 shown in FIG. 2 on the second innermost side from the outermost periphery by the moving mechanism 115, the encoded data is reproduced from the divided area # n-1, and the encoded data is The data is supplied to the buffer memory 112 via the recording / reproduction control circuit 113 and temporarily stored (step S48).

  Subsequently, the host CPU 120 determines whether or not the decremented variable i2 has reached (n / 2) +1 (step S49), and if not, determines whether or not the reproduction has ended (step S50). In step S50, unless all the encoded data to be reproduced is completed or the reproduction is not stopped, it is determined that the reproduction is not completed, the process returns to step S44, and the processes of steps S45 to S48 are performed. The reproduction of the inner divided area # i1 and the reproduction of the outer divided area # i2 are alternately performed.

  If n is an even number, if it is determined in step S49 that i2 has reached (n / 2) +1, it is determined that the reproduction of all the divided areas is complete, and the reproduction is terminated (step S52). When n is an odd number, when the variable i1 becomes larger than n / 2 in step S45, the encoded data is reproduced from the inner divided area # i1 (step S51), and the reproduction is finished. (Step S52). In this manner, each part of the encoded data is sequentially reproduced from each of all the divided areas # 1 to #n. Further, if it is determined in step S50 that the reproduction has been completed even if the reproduction of all the divided areas has not been completed, the reproduction is terminated (step S52).

  Next, another example of the playback method and playback device will be described. FIG. 8 shows a flowchart of another example of the playback method and playback device. In this example, according to the first embodiment shown in FIG. 4, recording is first performed in the outermost peripheral area #n of FIG. 2, and subsequently recorded in the innermost peripheral area # 1. In this example, the encoded data is reproduced from the optical disc 200 in which the encoded data is alternately recorded so that the circumferential divided areas do not overlap toward the center of the optical disc 200.

  In FIG. 8, the host CPU 120 of FIG. 1 first performs initialization by substituting “n” for the variable i1 and substituting “1” for the variable i2 (step S61). Here, the above “n” is the number of divided areas shown in FIG. Subsequently, after the optical pickup 114 is sought to the outermost peripheral area #n of the optical disc 200 shown in FIG. 2 and the encoded data is reproduced from the outermost peripheral area #n (step S62), the optical pickup 114 is moved to the innermost peripheral area. After seeking the area # 1, the encoded data is reproduced from the innermost area # 1 (step S63). The reproduced encoded data is supplied to the buffer memory 112 via the recording / reproduction control circuit 113 and temporarily accumulated.

  Subsequently, the host CPU 120 decrements the variable i1 by “1” (step S64), determines whether or not the variable i1 after the decrement is smaller than (n / 2) +1 (step S65). Since the divided area to be reproduced has not yet reached half, the divided area # i1 (here, # n−1) indicated by the variable i1 after decrement, that is, the optical pickup 114 is moved from the innermost circumference by the optical pickup moving mechanism 115. After seeking the divided area # n−1 shown in FIG. 2 on the second inner circumference side, the encoded data is reproduced from the divided area # n−1 (step S66).

  Subsequently, the host CPU 120 increments the variable i2 by “1” (step S67), and the divided area # i2 (in this case, # 2) indicated by the variable i2 after the increment, that is, the optical pickup 114 is moved to the optical pickup moving mechanism. After the seek to the divided area # 2 shown in FIG. 2 on the second outermost side from the innermost circumference by 115, the encoded data is reproduced from the divided area # 2 (step S68). The encoded data reproduced in steps S66 and S68 are sequentially stored in the buffer memory 112.

  Subsequently, the host CPU 120 determines whether or not the incremented variable i2 has reached (n / 2) (step S69), and if not, determines whether or not the reproduction has ended (step S70). In step S70, if all the encoded data to be reproduced has not been completed or if the reproduction is not to be stopped, it is determined that the reproduction has not been completed, the process returns to step S64 again, and the processes of steps S65 to S68 are performed. The reproduction of the outer divided area # i1 and the reproduction of the inner divided area # i2 are alternately performed. Also, the reproduction encoded data sequentially stored in the buffer memory 112 is continuously read from the buffer memory 112 and supplied to the video codec 140 via the host interface 111 and the host bus 150 of FIG.

  If n is an even number, if it is determined in step S69 that i2 has reached (n / 2), it is determined that the reproduction of all the divided areas is complete, and the reproduction is terminated (step S72). If n is an odd number, when the variable i1 is smaller than (n / 2) +1 in step S65, the encoded data is reproduced from the outer divided area # i1 (step S71) and then reproduced. Is finished (step S72). In this manner, each part of the encoded data is sequentially reproduced from each of all the divided areas # 1 to #n. Further, if it is determined in step S70 that the reproduction has been completed even if the reproduction of all the divided areas has not been completed, the reproduction is terminated (step S72).

  As described above, in the examples of FIGS. 7 and 8, the single optical pickup 114 is alternately moved in the inner circumferential side direction and the outer circumferential side direction of the CAV type optical disc 200, and each is performed in the same order as in recording. A part (encoded data of a certain period) of encoded data continuous from the divided area is sequentially reproduced. Here, assuming that the transfer rates of the outermost peripheral area #n and the innermost peripheral area # 1 are 1.0 times and 0.4 times the standard speed, respectively, the innermost area #n and the innermost area #n. Although the recording / reproducing speed (transfer speed) of the peripheral area # 1 is about 2/5, the average transfer speed can be improved by using the buffer memory 112. Hereinafter, specific examples of the reproduction examples in FIGS. 7 and 8 will be described in detail with reference to the drawings.

  FIGS. 9A and 9B are specific examples of the reproduction example described with reference to the flowchart of FIG. 7. Of the n divided areas # 1 to #n of the optical disc 200 shown in FIG. The encoded data is recorded in the peripheral area # 1, and then the encoded data is recorded in the outermost peripheral area #n. Thereafter, the inner and outer divided areas are centered on the optical disc 200 with respect to the center. FIG. 6 is a diagram schematically showing an operation of intermittently reproducing inner and outer divided areas intermittently in the same order as when recording from optical disc 200 on which encoded data is alternately recorded. . 9A and 9B, the vertical axis represents the transfer rate, and the horizontal axis represents the time.

  Here, the transfer rates of the outermost peripheral area #n and the innermost peripheral area # 1 are set to 1.0 times speed and 0.4 times speed, respectively, as compared with the standard speed. In this case, the recording / reproducing speed (transfer speed) of the innermost peripheral area # 1 is about 2/5 as compared with the outermost peripheral area #n, but the average transfer speed can be improved by using the buffer memory 112. .

  First, the reproduction operation shown in FIG. 9A will be described. The encoded data is recorded on the optical disc 200 at this time by the method shown in FIG. First, the encoded data is reproduced from the innermost peripheral area # 1 by the optical pickup 114 at a speed of 0.4 times at a speed of 800 ms, and then the optical pickup 114 is seeked to the outermost peripheral area #n by the optical pickup moving mechanism 115. The 800 ms period encoded data is reproduced from the outermost peripheral area #n at 1.0 times speed. Subsequently, the optical pickup 114 is sought by the optical pickup moving mechanism 115 to the inner peripheral area # 2 which is the second outer peripheral side divided area from the innermost periphery, and then the encoded data for a period of 800 ms from the inner peripheral area # 2. Subsequently, the optical pickup 114 is sought to the outer peripheral area # n−1, which is the second inner peripheral divided area from the outermost periphery by the optical pickup moving mechanism 115, and then the outer peripheral area # n−1. On the other hand, 800 ms period encoded data is reproduced. Thereafter, in the same manner as described above, the reproduction is intermittently performed alternately on the inner divided region and the outer divided region. Actually, the seek time becomes shorter as playback progresses.

  The buffer memory 112 temporarily stores the reproduction encoded data supplied through the recording / reproduction control circuit 113 and then continuously reads it out. The average transfer speed of the reproduction encoded data supplied to the buffer memory 112 is the same as that at the time of recording. In the case of FIG. 9A, the reproduction time is 800 ms and the seek time is 200 ms, which is 0 compared to the standard speed. It is .56 times speed. That is, if the transfer speed in the outermost peripheral area is 12.0 times faster than the standard speed, the average transfer speed in FIG. 9A is about 6.7 (= 0.56 × 12.0) times faster. However, a playback delay occurs. This is a delay resulting from the need to store a certain amount of reproduced encoded data in the buffer memory 112 in order to reproduce from the innermost peripheral area # 1 which is slower than the average transfer rate.

  Next, the reproducing operation schematically shown in FIG. 9B will be described. The encoded data is recorded on the optical disc 200 at this time by the method shown in FIG. When reproducing the optical disc 200, as shown in FIG. 9B, first, the encoded data is reproduced from the innermost peripheral area # 1 by the optical pickup 114 at 0.4 × speed for a period of 1800 ms, and then the optical pickup 114. Is read to the outermost peripheral area #n by the optical pickup moving mechanism 115, and then encoded data of 1800 ms is reproduced from the outermost peripheral area #n at 1.0 times speed.

  Subsequently, after the optical pickup 114 is sought to the divided area # 2 on the inner circumference side by the optical pickup moving mechanism 115, the encoded data is reproduced from the divided area # 2 for a period of 1800 ms, and then the optical pickup 114 is moved to the outer circumference. After seeking to the divided area # n-1, the encoded data for a period of 1800 ms is reproduced for the divided area # n-1. Thereafter, in the same manner as described above, reproduction is intermittently performed alternately with respect to the divided area on the inner peripheral side and the divided area on the outer peripheral side with respect to the center.

  The average transfer speed of the reproduction encoded data supplied to the buffer memory 112 is the same as that at the time of recording. In the case of FIG. 9B, the reproduction time is 1800 ms and the seek time is 200 ms, which is 0 compared to the standard speed. .63 times faster. That is, if the transfer speed in the outermost peripheral area is 12.0 times faster than the standard speed, the average transfer speed in FIG. 9B is about 7.6 (= 0.63 × 12.0) times faster.

  FIGS. 10A and 10B are specific examples of the reproduction example described together with the flowchart of FIG. 7, and first of all, out of the n divided areas # 1 to #n of the optical disc 200 shown in FIG. The encoded data is recorded in the area #n, and then the encoded data is recorded in the innermost peripheral area # 1. Thereafter, the outer divided area and the inner divided area are alternately directed toward the center of the optical disc 200. FIG. 6 is a diagram schematically showing an operation of intermittently reproducing an outer peripheral side divided area and an inner peripheral side divided area in the same order as when recording from an optical disc 200 on which encoded data is recorded. 10A and 10B, the vertical axis represents the transfer speed, and the horizontal axis represents time.

  Here, the transfer rates of the outermost peripheral area #n and the innermost peripheral area # 1 are set to 1.0 times speed and 0.4 times speed, respectively, as compared with the standard speed. In this case, the recording / reproducing speed (transfer speed) of the innermost peripheral area # 1 is about 2/5 as compared with the outermost peripheral area #n, but the average transfer speed can be improved by using the buffer memory 112. .

  Next, the reproduction operation shown in FIG. At this time, encoded data is recorded on the optical disc 200 by the method shown in FIG. As shown in FIG. 10A, first, encoded data is reproduced from the outermost peripheral area #n by the optical pickup 114 at a 1.0 × speed for a period of 800 ms, and then the optical pickup 114 is moved to the innermost peripheral area # 1. After seeking, the encoded data is reproduced from the innermost peripheral area # 1 at a speed of 0.4 times for a period of 800 ms.

  Subsequently, after seeking the optical pickup 114 to the divided area # n-1, the encoded data is reproduced for 800 ms from the divided area # n-1, and then the optical pickup 114 is seeked to the divided area # 2. Then, 800 ms period encoded data is reproduced for the divided area # 2. Thereafter, in the same manner as described above, the reproduction is intermittently and alternately performed with respect to the outer divided area and the inner divided area with respect to the center.

  The average transfer speed of the reproduction encoded data supplied to the buffer memory 112 is the same as that at the time of recording. In the case of FIG. 10A, the reproduction time is 800 ms and the seek time is 200 ms, which is 0 compared to the standard speed. It is .56 times speed. That is, if the transfer speed in the outermost peripheral area is 12.0 times faster than the standard speed, the average transfer speed in FIG. 10A is about 6.7 (= 0.56 × 12.0) times faster. In this example, the reproduction delay as shown in FIGS. 6A and 6B does not occur. This is because encoded data is reproduced from the outermost peripheral area #n to be reproduced first at a transfer rate higher than the average transfer rate and stored in the buffer memory 112.

  Next, the reproduction operation shown in FIG. 10B will be described. The encoded data is recorded on the optical disc 200 at this time by the method shown in FIG. As shown in FIG. 10B, first, encoded data is reproduced from the outermost peripheral area #n by the optical pickup 114 at a 1.0 × speed for 1800 ms, and then the optical pickup 114 is moved to the innermost peripheral area # 1. After seeking, the encoded data is reproduced from the innermost peripheral area # 1 at 0.4 times speed for a period of 1800 ms.

  Subsequently, after seeking the optical pickup 114 to the divided area # n-1, the encoded data for 1800 ms is reproduced from the divided area # n-1, and then the optical pickup 114 is seeked to the divided area # 2. Thereafter, encoded data of 1800 ms is reproduced for the divided area # 2. Thereafter, in the same manner as described above, the reproduction is intermittently and alternately performed with respect to the outer divided area and the inner divided area with respect to the center.

  The average transfer speed of the reproduction encoded data supplied to the buffer memory 112 is the same as that at the time of recording. In the case of FIG. 10B, the reproduction time is 1800 ms and the seek time is 200 ms, which is 0 compared to the standard speed. .63 times faster. That is, if the transfer speed in the outermost peripheral area is 12.0 times faster than the standard speed, the average transfer speed in FIG. 10B is about 7.6 (= 0.63 × 12.0) times faster. In this example, the reproduction delay as shown in FIGS. 6A and 6B does not occur. This is because encoded data is reproduced from the outermost peripheral area #n to be reproduced first at a transfer rate higher than the average transfer rate and stored in the buffer memory 112.

  As described above, the transfer speed of encoded data can be increased over the entire recording area of the optical disc 200 by intermittently alternately recording and reproducing the inner peripheral divided area and the outer peripheral divided area. it can.

  Next, a sector management method for realizing intermittent alternate recording and reproduction will be described. The logical addresses of the optical disc 200 are assigned alternately to the inner peripheral segment and the outer peripheral segment in the plurality of segment areas and sequentially in the direction of the center of the optical disc. By recording and reproducing, the recording and reproducing of the present invention can be realized. Here, the logical address may be allocated as an optical disk device or an optical disk file system.

  The present invention is not limited to the above embodiments and examples. For example, instead of using the buffer memory 112 of the recording / reproducing apparatus 100, for example, the host memory 400 can be used. As a result, the present invention can be implemented without depending on the buffer memory capacity of the recording / reproducing apparatus 100.

  Further, in the above-described embodiments, the description has been made so that, among the plurality of divided areas of the optical disc 200, the inner divided area and the outer divided area are allocated alternately and sequentially toward the center of the optical disk. First, recording or reproduction is performed on the divided area at the center of the entire recording area of the optical disc 200, and subsequently, on the divided area adjacent to the inner peripheral side (or outer peripheral side) of the central divided area. Recording or reproduction is performed, and then recording or reproduction is performed on the divided area adjacent to the outer peripheral side (or inner peripheral side) of the center divided area. Alternatively, recording or reproduction of each divided area may be performed alternately. Further, although the embodiments of the recording / reproducing apparatus have been described, the effects of the present invention can be realized by reproducing the recording medium recorded according to the present invention.

  Furthermore, in the above embodiment, the description has been made so that the optical pickup 114 is alternately moved and recorded among the plurality of divided areas of the optical disc 200, and the divided areas on the inner circumferential side and the outer divided side are recorded. The desired effect of the present invention can also be obtained by generating optical disk image data in advance so as to obtain the same recording result as that of the recorded recording medium, and recording this optical disk image data on the optical disk 200. For example, in the case of a CD (Compact Disc), the optical disk image data has a standard specification according to ISO9660.

It is a block diagram which shows one Embodiment of the recording / reproducing apparatus of this invention. It is a figure explaining an example of each division area of the optical disk recorded and reproduced by one embodiment of the present invention. 1 is a flowchart of a first embodiment of a recording method and a recording apparatus of the present invention. It is a flowchart of 2nd Embodiment of the recording method and recording apparatus of this invention. It is the figure which represented typically the operation | movement of Example 1, 2 of the 1st Embodiment of this invention. It is the figure which represented typically the operation | movement of Example 3, 4 of the 2nd Embodiment of this invention. 3 is a flowchart of an example of a method for reproducing an optical disc recorded according to an embodiment of the present invention. 6 is a flowchart of another example of an optical disc recorded according to an embodiment of the present invention. For an optical disc recorded according to an embodiment of the present invention, the innermost peripheral area is reproduced first, then the outermost peripheral area is reproduced, and thereafter, the inner peripheral area and the outer peripheral area are intermittently separated. It is the figure which represented typically the operation | movement of the example reproduced alternately. For an optical disc recorded according to an embodiment of the present invention, the outermost peripheral area is reproduced first, then the innermost peripheral area is reproduced, and thereafter, the outer peripheral divided area and the inner peripheral divided area are intermittently separated. It is the figure which represented typically the operation | movement of the example reproduced alternately.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Recording / reproducing apparatus 110 Recording / reproducing part 111 Host interface 112 Buffer memory 113 Recording / reproducing control circuit 114 Optical pick-up 115 Optical pick-up moving mechanism 116 Spindle motor 120 Host CPU (central processing unit)
130 Host memory 140 Video codec 150 Host bus

Claims (4)

In a recording method for recording continuous desired information using a single optical pickup on an optical disk rotating at a constant rotational speed,
Of the n divided areas obtained by dividing the recording area of the optical disk into n (n is a natural number of 4 or more), the first portion of the desired information in the first divided area set in advance first A first step of recording
After recording in the first divided area, the optical pickup is moved to a second divided area on the inner peripheral side (or outer peripheral side) of the first divided area, and the first of the desired information is recorded. After the second portion is recorded, the optical pickup is moved to the third divided region on the outer peripheral side (or inner peripheral side) of the second divided region, and the third portion of the desired information is moved. Recording, and then moving the optical pickup to the fourth divided area on the inner circumference side (or outer circumference side) of the third divided area to record the fourth portion of the desired information. A second step of repeating
And recording each portion of the desired information in each of the n or less divided areas in order by reciprocating the optical pickup alternately. In an optical disk that rotates at a constant rotational speed, a recording device that records continuous desired information using a single optical pickup,
Temporary storage means for temporarily storing the desired information;
Of the n divided areas obtained by dividing the recording area of the optical disc into n (n is a natural number of 4 or more), the optical pickup is moved to an arbitrary divided area, and the arbitrary divided area is Moving means for recording a part of desired information;
The moving means and the temporary storage means are controlled to record the first portion of the desired information in the first divided area set in advance, and to the first divided area. After recording, after recording the second portion of the desired information by moving the optical pickup to the second divided area on the inner peripheral side (or outer peripheral side) of the first divided area, The optical pickup is moved to a third divided area on the outer peripheral side (or inner peripheral side) of the second divided area to record a third portion of the desired information, and then the third divided area is recorded. Repeatedly recording the fourth portion of the desired information by moving the optical pickup to a fourth divided area on the inner circumference side (or outer circumference side) of the divided area, Each portion of the desired information is sequentially recorded in each of the divided areas. Recording apparatus characterized by comprising a recording control means. In a recording / reproducing method of recording continuous desired information on an optical disk rotating at a constant rotational speed using a single optical pickup, and reproducing the recorded desired information from the optical disk,
Of the n divided areas obtained by dividing the recording area of the optical disk into n (n is a natural number of 4 or more), the first portion of the desired information in the first divided area set in advance first A first step of recording
After recording in the first divided area, the optical pickup is moved to a second divided area on the inner peripheral side (or outer peripheral side) of the first divided area, and the first of the desired information is recorded. After the second portion is recorded, the optical pickup is moved to the third divided region on the outer peripheral side (or inner peripheral side) of the second divided region, and the third portion of the desired information is moved. Recording, and then moving the optical pickup to the fourth divided area on the inner circumference side (or outer circumference side) of the third divided area to record the fourth portion of the desired information. A second step of repeating
From the optical disc in which each portion of the desired information is sequentially recorded in each of the n or less divided regions by the first and second steps, the optical pickup is moved in the outer peripheral direction of the optical disc. And a third step of sequentially reproducing each portion of the desired information by reciprocating alternately in the inner circumferential direction, and
And a fourth step of continuously reading out each portion of the desired information reproduced in the third step and then reading it out. In a recording / reproducing apparatus for recording or reproducing continuous desired information using a single optical pickup with respect to an optical disk rotating at a constant rotational speed,
Temporary storage means for temporarily storing the desired information and reproduced information;
Of the n divided areas obtained by dividing the recording area of the optical disc into n (n is a natural number of 4 or more), the optical pickup is moved to an arbitrary divided area, and the arbitrary divided area is Moving means for recording or reproducing a part of desired information;
The moving means and the temporary storage means are controlled to record the first portion of the desired information in the first divided area set in advance, and to the first divided area. After recording, after recording the second portion of the desired information by moving the optical pickup to the second divided area on the inner peripheral side (or outer peripheral side) of the first divided area, The optical pickup is moved to a third divided area on the outer peripheral side (or inner peripheral side) of the second divided area to record a third portion of the desired information, and then the third divided area is recorded. Repeatedly recording the fourth portion of the desired information by moving the optical pickup to a fourth divided area on the inner circumference side (or outer circumference side) of the divided area, Each portion of the desired information is sequentially recorded in each of the divided areas. And recording control means,
The moving means and the temporary storage means are controlled to first reproduce the first portion of the desired information from the first divided area, and after reproduction of the first divided area After moving the optical pickup to the second divided area on the inner peripheral side (or outer peripheral side) of the first divided area and reproducing the second portion of the desired information, The optical pickup is moved to the third divided area on the outer peripheral side (or inner peripheral side) of the second divided area to reproduce the third portion of the desired information, and subsequently Repeating the reproduction of the fourth portion of the desired information by moving the optical pickup to the fourth divided region on the inner peripheral side (or outer peripheral side) of the third divided region; Of the desired information from each of the n or less divided regions, A reproduction control means for sequentially reproduced and stored temporarily in the temporary storage unit portions,
Reproduction information generating means for obtaining reproduction information by decoding each part of the reproduced desired information read from the temporary storage means.

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