JPH10149634A - Method and device for recording and reproducing data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a data transfer speed by making the maximum value of a seeking time small for recording/reproducing time sequential data such as a video signal or an audio signal in a disk storage medium. SOLUTION: A harddisk is divided into, for instance four segments S1 to S4 and, while write segments are sequentially switched, video/audio information is written. That is, data 1 of time t(0) is first written in the head address 0 of the segment S1 located in the outermost periphery. Then, data 1 of time t(1) is written in the head address 1 of the segment S2. Hereinafter, similarly, data of t(2) is written in the head address 2 of the segment S3, data of t(3) in the head address 3 of S4, data of t(5) in the second address 5 of S4 and data of t(6) in the second address of S3, and while the segments are sequentially changed for writing like this, and when data is written in the segment of the innermost or outermost periphery, the changing direction of the segments is inverted and data is written. Thus, the maximum value of a seeking time is reduced to 174 for writing data in continuous addresses.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for recording or simultaneously recording / reproducing time-series data such as a video signal and an audio signal on a disk recording medium capable of random access, and more particularly to an addressing method.

[0002]

2. Description of the Related Art Conventionally, continuously supplied time-series data such as video signals and audio signals are recorded on a randomly accessible recording medium such as a hard disk, and the recorded time-series data is continuously recorded. Readout and reproduction are performed. Normally, when recording and reproducing such time-series data, the data is recorded at consecutive addresses on a recording medium.

In the case of a hard disk as an example, a plurality of tracks are formed concentrically on a recording surface thereof, and each track is divided into a plurality of fixed-length sectors. Tracks are assigned track numbers starting from 0 from the outermost circumference to the innermost circumference. As described above, the assignment of the logical address (track number + sector number) in the hard disk is continuously arranged from the outer periphery to the inner periphery. Therefore, the time-series data sequentially supplied is sequentially written from the outer track to the inner track of the hard disk, and after being written to the last address of the innermost track, the head address of the outermost track is again returned. Was written sequentially.

[0004]

Therefore, when sequentially recording and reproducing sequentially supplied time-series data such as video signals and audio signals on a hard disk drive which performs recording and reproduction by moving a single head, When the recording position reaches the final address and recording is continued from the head address again, the physical recording position on the hard disk changes greatly, and the seek time becomes longer. Also, when reproducing data recorded at another position while recording data, when the recording position and the reproduction position are greatly separated, the moving amount of the head becomes large, and as a result, the seek time is increased. become longer.

[0005] In particular, when real-time properties are required, such as when recording or simultaneous recording and reproduction of video signals, audio signals, and the like, data necessary for recording / reproducing data on a hard disk due to an increase in the seek time described above is required. An increase in time, that is, a decrease in the transfer rate is a serious problem.

Accordingly, the present invention reduces the seek time when time-series data such as a video signal and an audio signal is recorded on a recording medium such as a hard disk which can be accessed at random, or is reproduced simultaneously with recording. The purpose is to prevent the data transfer rate from decreasing.

[0007]

In order to achieve the above object, a first data recording method of the present invention is a method of recording time-series data such as a video signal and an audio signal on a disk recording medium, This is a data recording method in which the time-series data is sequentially written at discontinuous positions on a disk recording medium. Another data recording method of the present invention is a method of recording time-series data such as a video signal and an audio signal on a disk recording medium, wherein the disk recording medium is divided into a plurality of segments having continuous sectors, This is a recording method in which the time-series data is sequentially written to adjacent segments.

Further, the data recording / reproducing method of the present invention comprises:
A method of recording time-series data such as video signals and audio signals on a disk recording medium and reproducing the already recorded time-series data, dividing the disk recording medium into a plurality of segments having continuous sectors, This is a data recording / reproducing method in which the time-series data is sequentially written in an adjacent segment and the time-series data recorded in the segment is read.

Still further, the data recording apparatus of the present invention comprises:
An apparatus for recording time-series data such as a video signal and an audio signal on a disk recording medium, comprising: address generating means for generating a recording address for the disk recording medium; The recording addresses corresponding to the above discontinuous positions are sequentially generated. Still further, another data recording apparatus of the present invention is an apparatus for recording time-series data such as a video signal and an audio signal on a disk recording medium, wherein an address generating means for generating a recording address on the disk recording medium is provided. The address generating means divides all addresses of the disk recording medium into a plurality of segments each having a continuous sector, and sequentially generates recording addresses belonging to adjacent segments.

Further, a data recording / reproducing apparatus of the present invention is an apparatus for recording time-series data such as a video signal and an audio signal on a disk recording medium and reproducing the already recorded time-series data. Address generating means for generating a recording address and a reproducing address for the disk recording medium, the address generating means dividing all the addresses of the disk recording medium into a plurality of segments each having a continuous sector, and sequentially adjoining the segments. A recording address and a reproduction address belonging to a segment are generated continuously.

[0011] When recording time-series data on a disk recording medium such as a hard disk, the maximum seek time can be reduced by recording the data discontinuously instead of sequentially recording the data at consecutive logical addresses. And thereby increase the data transfer rate.

[0012]

FIG. 1 is a block diagram showing a configuration of a data recording / reproducing apparatus to which an embodiment of a data recording / reproducing method according to the present invention is applied. In FIG. 1, reference numeral 1 denotes a data compression device for compressing time-series data such as video signals or audio signals which are continuously input by a predetermined algorithm, and 2 denotes a controller which controls writing and reading of data to and from a hard disk device 3. The recording address and the reproduction address for the hard disk device 3 are generated by the controller 2.
Reference numeral 3 denotes a hard disk device on which the time-series data and the like are recorded, and reference numeral 4 denotes an expansion device for expanding the time-series data read from the hard disk device 3.

In the data recording / reproducing apparatus configured as described above, the time series data to be recorded compressed by the data compression apparatus 1 is stored in the hard disk drive 3 under the control of the controller 2 as described later. The information is sequentially recorded at the determined address. Further, the time-series data already written in the hard disk device 3 is sequentially read out under the control of the controller 2, decompressed by the decompression device 4 and output as a reproduced video / audio signal.

Hereinafter, a method of determining an address for sequentially recording time-series data supplied continuously will be described. LBA_NUM is the total number of sectors of the hard disk device 3.
Then, an arbitrary logical address (LBA) a is represented by the following equation (1). 0 ≦ a ≦ LBA_NUM −1 (1). Therefore, the hard disk drive 3 is divided into n (n is plural, that is, n = 2, 3,
, And LBA_NUM mod n = 0), and divides the address a (t) at which data is written at time t (t = 0, 1, 2,...) Into the following equation (2) and It is defined as in equation (3). a (t) = [t / n] + (t mod 2n) d (when t mod 2n ≦ n−1) (2). a (t) = [t / n] + {2n−1− (t mod 2n)} d (when n ≦ t mod 2n) (3). Here, d = LBA_NUM / n, and [x] represents the largest integer not exceeding x.

The logical address a (t) thus defined
If the maximum t that satisfies t ≦ LBA_NUM and t mod 2n = 0 is set as the final t by writing to the head, the maximum seek amount of the head is required for the movement of the head between the innermost circumference and the outermost circumference. It can be about 1 / n of the amount.

Hereinafter, the case where n = 4 and LBA_NUM = 400 will be specifically described as an example. From the above equations (2) and (3), a logical address a (t) at which data is recorded at each time t is obtained as shown in Table 1 below.

[Table 1]

FIG. 2 is a diagram schematically showing the transition of the recording address at each time t shown in Table 1 above. In this figure, the horizontal axis indicates the logical address, the left side of the figure is the start address, and the right side is the last address. As shown in the figure, all logical addresses are divided into four segments indicated by S1 to S4.
Is the segment 1 in the area of the outermost logical address 0 to 99, the segment S2 in the area of the logical address 100 to 199, the segment S3 in the area of the logical address 200 to 299, and the logical address in the innermost side. Is 300 ~
An area 399 is set as a segment S4. The vertical axis in the figure is the time axis, and the numbers in the figure indicate the data recording positions at each time t.

As shown in Table 1, at the first timing t (0), the position 0 (logical address =
0) is written. This position is segment S
1 is the first address. Subsequently, at time t (1), data is written to position 1 (logical address 100). This position is the start address of the segment S2. Subsequently, at time t (2), position 2 (logical address 200, the head position of segment S3), time t
In (3), data is sequentially recorded from the outer peripheral side to the inner peripheral side, such as position 3 (logical address 300, head position of segment S4).

The data at the next time point t (4) is recorded at position 4 (logical address 301, segment S4). Then, this time, data is recorded while moving the segment for writing data from the inner circumference side to the outer circumference side. That is, the data at time t (5) is at position 5 (logical address 201 of segment S3), the data at t (6) is at position 6 (logical address 101 of segment S2), and t (7).
Is written to the position 7 (logical address 1 of the outermost segment S1). And the next time point t
The data of (8) is written to position 8 (logical address 2 of segment S1), and the next data of t (9) is written to position 9
(Logical address 102 of segment S2).
Hereinafter, data is sequentially written in the same manner.

As described above, data is written while sequentially moving segments to which data is written. When the data reaches the innermost or outermost segment, the data is sequentially written in the reverse direction from the innermost or outermost segment. The data is written while changing the segment. Thereby, the moving amount of the head can be suppressed. In the conventional method of sequentially recording at consecutive addresses, the moving distance of the logical address is the maximum LBA_NUM, that is, the moving amount of the head can be the distance from the innermost circumference to the outermost circumference,
According to the method of the present invention described above, the maximum value of the movement amount of the head can be suppressed to about 1 / (n) of the number of divisions of the sector (セ ク タ in the above example). Therefore, the maximum value of the seek time can be reduced.

Next, a description will be given of a case in which data that is already recorded is simultaneously read while data is being recorded, that is, simultaneous recording and reproduction is performed. In this case, the maximum value of the seek time can be reduced by reading the data written in the same segment as the segment for recording the data.

This will be described with reference to FIG. In FIG. 3, the horizontal axis represents a logical address, the vertical axis represents time, and each number represents a position where data is stored. "R" means reproduction, and "W" means recording. Now, as described with reference to FIG.
It is assumed that data is continuously recorded in Nos. To 7. In such a state, the position 0 recorded in the past
The data at (logical address 0) is read and reproduced, and the current video / audio signal is newly recorded at the position 8 (logical address 2) in the same segment S1 as the reproduced data. Next, position 1 (logical address 10) in segment S2
The data recorded at 0) is reproduced, and the next data is recorded at position 9 (logical address 102). This is continued as shown in the figure.

Then, the position 3 of the innermost segment S4
After reading and reproducing the data at (logical address 300), new data is written to position 11 (logical address 302) in the same segment S4. Subsequently, the data written at the position 4 (logical address 301) in the same segment S4 is read, and new data is written at the position 12 (logical address 303) in the same segment S4. As described above, in the innermost segment, data is written to two segment positions, and data is read from the two segment positions. This is the same for the outermost segment. Hereinafter, data reading and writing are performed in a similar manner while changing the segment.

By adopting such a system, the maximum movement amount of the head becomes a movement amount corresponding to the size of two segments at worst, and data is recorded and reproduced at continuous addresses without being divided into segments. In comparison with the case, the moving amount can be suppressed to about 2 / (the number of segment divisions = n) (１ ／ in the case of n = 4).

FIG. 4 is a diagram showing an example of the timing in the case of such simultaneous recording and reproduction. FIG. 4A shows the case of the conventional data recording method, and FIG. 4B shows the case of the data recording method of the present invention. ing. In this figure, read indicates read time, write indicates write time, and hatched portions indicate seek time. When simultaneous recording and reproduction are performed after continuous recording, the maximum seek time becomes the maximum seek time of the disc, as shown in A. On the other hand, when the method of the present invention is used, B
As shown in (1), the maximum seek time is smaller than the maximum seek time of the disk.

In the above description, the case of recording and reproducing data on the hard disk device has been described as an example. However, the present invention is not limited to this. For example, other disks such as an optical disk and a magneto-optical disk may be used. The same applies to the case where data is recorded on a recording medium.

[0027]

As described above, according to the simultaneous recording / reproducing method of the present invention, the maximum seek amount can be reduced, so that the capacity of the buffer to be held can be reduced. Further, when the amount of the buffer is fixed, the data transfer rate can be increased.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a data recording / reproducing apparatus to which a data recording / reproducing method of the present invention is applied.

FIG. 2 is a diagram showing a specific example of a recording method according to the data recording method of the present invention.

FIG. 3 is a diagram showing a specific example of a simultaneous recording / reproducing method according to the data recording / reproducing method of the present invention.

FIG. 4 is a time chart of an operation in a data recording / reproducing method of the present invention and a conventional recording / reproducing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compression device 2 Control device (controller) 3 Hard disk device 4 Decompression device

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Katsunari Miyata 6-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (6)

[Claims] 1. A method for recording time-series data such as a video signal and an audio signal on a disk recording medium, wherein the time-series data is sequentially written at discontinuous positions on the disk recording medium. A data recording method characterized by the following. 2. A method for recording time-series data such as a video signal and an audio signal on a disk recording medium, comprising: dividing the disk recording medium into a plurality of segments having continuous sectors; A data recording method for writing data to a segment to be recorded. 3. A method for recording time-series data such as a video signal and an audio signal on a disk recording medium and reproducing the already recorded time-series data. A data recording / reproducing method, comprising dividing the data into segments, sequentially writing the time-series data in adjacent segments, and reading the time-series data recorded in the segments. 4. An apparatus for recording time-series data such as a video signal and an audio signal on a disk recording medium, comprising: an address generating means for generating a recording address on the disk recording medium; A data recording apparatus for sequentially generating recording addresses corresponding to discontinuous positions on the disk recording medium. 5. An apparatus for recording time-series data such as a video signal and an audio signal on a disk recording medium, comprising: address generating means for generating a recording address on the disk recording medium; A data recording apparatus, wherein all addresses of the disk recording medium are divided into a plurality of segments each having a continuous sector, and recording addresses belonging to adjacent segments are sequentially generated. 6. An apparatus for recording time-series data such as a video signal and an audio signal on a disk recording medium and reproducing the already recorded time-series data, comprising: a recording address and a reproduction address for the disk recording medium. The address generating means divides all the addresses of the disk recording medium into a plurality of segments each having a continuous sector, and sequentially determines a recording address and a reproduction address belonging to adjacent segments. A data recording / reproducing device characterized by being generated continuously.