JPH07220388A - Method and device for reproducing recorded information - Google Patents

Abstract

PURPOSE:To reduce the required capacity of a buffer memory by accessing plural recording media, in which a block information of divided continuous information is recorded in parallel, within a frame time for a prescribed number and storing the read block information in a prescribed manner. CONSTITUTION:A block information (d), in which a continuous information is divided, is recorded in L plural disks in a parallel manner. The information (d) is reproduced by accessing the disks for M times for every period where each frame has same frame periods F1 and F2. Within one frame period of a reproduced block (d) which is reproduced by an i th reproduction device at the period F1 and a block (d) which is reproduced by an i+1st reproducing device at the continued period F2, the data block which is read only once from one reproduction device is two-block-stored into a buffer memory 12 through a matrix switch 11 for every channel. Thus, the increase in the buffer memory capacity is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recorded information reproducing method and apparatus for reproducing recorded information recorded on a recording medium.

[0002]

2. Description of the Related Art Conventionally, as an example of an information recording / reproducing apparatus for recording information on a recording medium and reproducing this recorded information, there is, for example, a language learning system using a recording medium. This language learning system is composed of a master unit equivalent to a teacher and a plurality of slave units operated by students.
Therefore, according to the language learning system, the plurality of child devices access desired speech data for language learning in the parent device. As the parent device, a disc reproducing device for reproducing a disc-shaped recording medium such as an optical disc or a magnetic disc is used.

In such a language learning system,
In practice, audio material is pulse code modulated (P
It is recorded as a CM) signal or is recorded in a compressed form. Therefore, in this language learning system, the audio material designated by the student is supplied from the master unit to the slave unit of the student, and in the slave unit of the student, the buffer memory provided for each of the plurality of channels corresponding to the slave unit. The compressed signal is expanded on the time axis, and the PCM signal expanded on the time axis is D / A-converted so that a desired audio teaching material can be heard for each slave unit.

In the above language learning system, as described above, when the reproduction data of one disk reproducing device is selectively supplied to the buffer memories of a plurality of channels, the channels are arranged in the order of the channels. In order to seek the designated track of the disc, the number of allowable channels is determined depending on the maximum seek time of the disc.

Therefore, when the reproduction signal of the disk reproducing apparatus is distributed to a plurality of channels, the track number is controlled so as to alternately change in a direction of increasing or decreasing every predetermined time, so that the track number is changed within a predetermined period. The present applicant has previously disclosed a disk reproducing apparatus capable of increasing the number of channels that can be accommodated in Japanese Patent Laid-Open No. 3-93068.

Here, in the disc reproducing apparatus as described above, the number of channels to be accommodated per disc can be maximized. However, in order to accommodate more channels than this limit, a plurality of discs can be accommodated. It has been considered to use a disk having a large rotation speed or a large track capacity.

However, when a plurality of disks are used in this way, a plurality of disks having the same contents are used, so that the number of channels accommodated increases, but the storage capacity does not increase. In addition, when a disc with a large number of revolutions and a large track capacity is used, it is necessary to use a special disc, which causes a problem of increasing the cost of the language learning system as a whole. there were.

Therefore, the applicant of the present invention has previously filed Japanese Patent Application No.
-34283, the desired recording signal is dividedly recorded on the same track position of a plurality of disc-shaped recording media, and reproduced on the same track of each of the disc-shaped recording media. A composite reproduction signal from a plurality of disc-shaped recording media is distributed to a plurality of channels, and at the time of this distribution, a plurality of discs are arranged so that each track number alternately changes in a direction of increasing or decreasing at predetermined time intervals. By specifying the reproduction track of the disk-shaped recording medium, the total seek time for a plurality of disk-shaped recording media can be shortened, thus increasing the recording capacity per track and the number of accommodated channels of the disk-shaped recording medium. A disk recording device and a reproducing device are proposed.

In practice, a plurality of disk recording / reproducing devices having a disk-shaped recording medium are used to secure a large number of channels and increase throughput.

[0010]

At the time of recording / reproducing in a system for securing a large number of channels and increasing throughput by using a plurality of disc recording / reproducing devices having the above-mentioned disc-shaped recording medium built-in. The data flow of can be expressed as shown in FIG.

In FIG. 5, assuming that data to be recorded is, for example, data in which video and audio are coded, is sequentially supplied as shown in A of FIG. 5, the disk shape of each disk recording / reproducing apparatus. The recording medium is A in FIG.
Data is recorded in block units shown in d in FIG. Further, when the number of disk recording / reproducing devices is L, L data blocks d are distributed and recorded in each of the L disk recording / reproducing devices.

On the other hand, when reading the data recorded by the L disk recording / reproducing devices as described above,
As shown in FIG. 5B, each of the L disk recording / reproducing devices 100 performs N times of access a _{1 to} a _N with respect to the disk-shaped recording medium contained therein at a frame cycle. Each data block d obtained by the N times of accesses a _{1 to} a _N is distributed by the multiplexer 101 to the buffer memory 102 corresponding to the N channels CH _{1 to} CH _N and sent. The data read from the buffer memory 102 are N-channel CH _1-
It is decoded and output by the decoder 103 corresponding to CH _N.

By the way, for example, by dividing and recording data such as video and audio into the L disk recording / reproducing apparatuses as described above and reading them simultaneously, the speed of one disk recording / reproducing apparatus is set to L. It is considered to be equivalent to doubling the capacity and doubling the capacity. Further, the data read from the L disk recording / reproducing devices is once stored in the buffer memory and then taken out as described above.

However, in this case, if the unit of reading data from each disk recording / reproducing device is a predetermined block unit, the read block data from all the L disk recording / reproducing devices is one disk. The number of blocks for reading data from the recording / reproducing apparatus is L times, and therefore the capacity of the buffer memory is also required to be L times per channel.

Therefore, after all, assuming that the number of channels is N (N is a natural number), the disk recording / reproducing apparatus is also N times larger, the block size is also N times larger, and the buffer capacity per channel is also required to be N times larger. Therefore, the capacity of the buffer memory for all channels needs to be N × N times. That is,
A buffer memory with a capacity that is the square of the number of channels is required.

For example, a so-called MPEG (Moving Pictu), which is a standard method of image compression encoding currently put into practical use.
re Expert Group) If the information of 1.5 megabits / second (Mbps) of video / audio compressed using the encoding method of 1 is supplied to 1000 channels, a block size of 500 kilobytes per unit of throughput / 15
This can be realized with 100 Mbps disk recording / reproducing devices, but the block size per channel is 500 × 100.
= 50 megaheights, so the buffer memory capacity for all channels is 50 × 1000 = 50 gigabytes. That is, if the recording capacity of a single disc recording / reproducing apparatus is 1 GB, 1/100 of the recording capacity of all 100 disc recording / reproducing apparatuses described above is
A buffer memory of up to 2 is required.

From the above, the relationship between the number of channels and the capacity of the buffer memory is as follows, for example.
For example, 10,000 channels has 5 terabytes, which is 5 times the recording capacity of a single disk recording / reproducing device, and 1000 channels has 50 gigabytes, which is 1/2 times the recording capacity of a single disk recording / reproducing device. Thus, 100 channels has 500 megabytes, which is 1/20 times the recording capacity of a single disc recording / reproducing apparatus, and 10 channels has 5 megabytes, which is 1 / l of the recording capacity of a single disc recording / reproducing apparatus. It will be 200 times.

Therefore, the present invention has been made in view of the above situation, and an object thereof is to provide a recorded information reproducing method and apparatus capable of reducing the capacity of the buffer memory. .

[0019]

The recorded information reproducing method of the present invention has been proposed in order to achieve the above-mentioned object, and divides a continuous information signal into a plurality of continuous unit blocks, and It is a recording information reproducing method for continuously reproducing the recorded information signal from a plurality of recording media in which the information is distributed in units of the blocks and the information of the distributed blocks is sequentially recorded in parallel. Here, the same frame time is set for all the recording media, and each recording medium is accessed within a predetermined number of times within this frame time. The recorded information signal is read in block units, and the information signal read from one recording medium is stored only once for each access within the predetermined number of times within one frame time, and stored in a predetermined size for each of a plurality of channels. To do. Further, when the information signal read from one recording medium among the plurality of recording media is stored in one frame time, in the next frame time, an information signal continuous with the information signal read from the one recording medium. The information signal from the next recording medium in which is recorded is stored.

The recorded information reproducing apparatus of the present invention divides a continuous information signal into a plurality of continuous unit blocks,
A recording information reproducing apparatus that sequentially reproduces the recorded information signal from a plurality of recording media in which the information of each block is distributed in units of the blocks and the information of the distributed blocks is sequentially recorded in parallel. Yes, a plurality of storage means each having a capacity of a predetermined size corresponding to each channel of the plurality of channels and the same frame time are set for all recording media, and each recording medium is set within this frame time. The information reading unit executes the access within a predetermined number of times and reads the recorded information signal in the block unit for each access from each recording medium, and the information reading unit includes each storage unit. In contrast, the information signal read from one recording medium is sent only once during the above-mentioned predetermined number of accesses within one frame time. Here, if the information reading means sends the information signal read from one recording medium of the plurality of recording media to the storage means in one frame time, the one recording time is recorded in the next frame time. The information signal is read from the next recording medium in which the information signal continuous with the information signal read from the medium is recorded and sent to the storage means.

Further, the information reading means reads out an information signal from each recording medium and outputs each information signal based on matrix information indicating the correspondence between each recording medium access and each channel within the frame time. It controls the sending of the information signal to the storage means. Further, the predetermined size is equal to two of the blocks. The recording medium is a disc-shaped recording medium.

[0022]

According to the recorded information reproducing method and apparatus of the present invention,
The same frame time is set for all recording media, each recording medium is accessed within a predetermined number of times within this frame time, and each recording medium is accessed in block units for each access. The recorded information signal is read out, and the information signal read out from one recording medium only once in one frame time is stored by a predetermined size for each of a plurality of channels to prevent an increase in storage capacity.

According to the recorded information reproducing method and apparatus of the present invention, one of a plurality of recording media can be recorded in one frame time.
At the next frame time when the information signal read from one recording medium is stored, the information signal from the next recording medium which records the information signal continuous with the information signal read from the one recording medium is recorded. By taking it out, a continuous information signal is reproduced without interruption.

Further, according to the recorded information reproducing apparatus of the present invention, the information reading means uses the matrix information indicating the correspondence between each channel and the access to each recording medium within the frame time so that each channel can be read. Further, the information signal read from one recording medium is sent only once within one frame time to the storage means for storing only a predetermined size.

Furthermore, by using a disc-shaped recording medium as the recording medium, it becomes easy to randomly access and read the recorded information.

[0026]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First, with reference to FIG. 1, a description will be given of the data previously recorded on the recording medium to which the recording information reproducing method and apparatus of the present invention are applied and the flow of reading the data from the recording medium. . In addition, in FIG. 1, as the recording medium, for example, a recordable and reproducible optical disk such as a magneto-optical disk and a phase change optical disk, and a disk-shaped recording medium to which a magnetic disk such as a hard disk and a flexible disk are applied are exemplified. .

In FIG. 1, if the data to be recorded is, for example, data in which video and audio are encoded, is sequentially supplied as shown in A of FIG. Data blocks divided in block units (for example, a unit block composed of B bits) indicated by d in A of 1 are recorded. If the number of disk recording devices that record data on this disk-shaped recording medium is L, L data blocks d will be distributed to and recorded by the L disk recording devices. The A in FIG. 1 corresponds to the A in FIG. 5 described above.

Data is read out in burst form from the disk-shaped recording medium on which data has been recorded by the L disk recording devices as described above. The readout method as shown is applied. This reading method is the recorded information reproducing method of the present invention, and the apparatus to which the recorded information reproducing method is applied is the recorded information reproducing apparatus of the present invention. The recorded information reproducing apparatus of the present invention includes L disk reproducing apparatuses 10 each having a disk-shaped recording medium in which data is recorded by the disk recording apparatus. In the embodiment of the present invention, each of the L disc reproducing devices 10 in the recorded information reproducing device can also operate as a disc recording device.

Here, in the recorded information reproducing apparatus of the embodiment of the present invention, as shown in B of FIG. 1, a plurality of channels (N
A buffer memory 12 of, for example, 2 block size (2B bits) is prepared for each channel for reading video / audio data of each channel. Each disk reproducing device 10
When the disk-shaped recording medium is accessed once, the data block d of the unit block is read, and the data of the data block d is sent to the predetermined buffer memory 12.

Further, in the embodiment of the present invention, the same frame time (F seconds) is set for all the disk reproducing devices, and each disk reproducing device executes the access within M times within this frame time.

Therefore, the buffer memory 12 for each channel is only once in the above-mentioned one frame time, that is, once in the number of accesses in all the disk reproducing devices (the number of disk reproducing devices L × the maximum access number M). ,
Data is supplied from one disk reproducing device.

Therefore, the matrix switch circuit 11
Is an L disc reproducing apparatus 1 during a certain frame time (frame F1) when reproducing the above-mentioned video / audio data.
The buffer memory 12, which has been supplied with data from the i-th disc reproducing apparatus out of 0, is supplied with data from the (i + 1) -th disc reproducing apparatus at the next frame time (frame F2). First, the data transmitted between the disc reproducing device 10 and the buffer memory 12 is switched.

In the matrix switch circuit 11, the same operation as described above is executed for all the buffer memories 12, so that each channel performs one frame access of L × M matrix-shaped disk access. It can be ensured while shifting in the L direction every time.

Therefore, according to the recorded information reproducing method and apparatus of the present embodiment, it is possible to continuously reproduce the video / audio data without any interruption for the (L × M) channels.

Further, in the recorded information reproducing method and apparatus of the present embodiment, at the time of starting reproduction, if there is at least one empty area in the above L × M matrix, it is possible to wait for a maximum of L times of frame time to discriminate any disc. The access to the empty area of the recording medium can be secured, and the once secured access can be continuously guaranteed.

The output from each buffer memory 12 is
It is decoded by the decoder 13 corresponding to each channel and is taken out as each of the channels CH _{1 to} CH _N.

Further, in the recorded information reproducing method and apparatus of the present embodiment, the number of times of access of each disk used within a frame is limited to (M-1), that is, the number of channels is L * (M-). As 1), each disk reproducing device is provided with an access margin for one time within a frame, and when the reproduction start request is made, this empty access portion is allocated, so that a maximum waiting time of one frame time can be used from an arbitrary disk portion. You will be able to start playback. It should be noted that, if the above is left as it is, the empty area for starting the reproduction is still occupied, so that the used channel after the reproduction start is L × (M−
1) It must be moved to the empty area of the matrix.

Furthermore, by having a skew buffer of the frame time difference between the empty channel and the area where the reproduction is started, it can be moved and accommodated in the L × (M−1) channel immediately after the reproduction is started.

Further, in the recorded information reproducing method and apparatus of the present embodiment, by using a plurality of accesses in the L × M matrix for the channel, it becomes possible to correspond to the output of different bit rates of integral multiples.

Next, FIG. 2 shows the configuration of a specific recorded information reproducing apparatus for realizing the above-described recorded information reproducing method of the present invention.

That is, the apparatus of FIG. 2 includes a hard disk drive apparatus HDD as the information reading means,
Disk buffer DB, channel buffer CB, controller CPU7 for generating output enable signal OE to this disk buffer DB, and generating write enable signal WE to channel buffer CB, disk access matrix circuit 8, timing generator 9
Further, the channel buffer CB is a storage unit that stores, for example, two block sizes as a predetermined size.

FIG. 2 shows an example in which ₁₀₀ hard disk drive devices HDD _{1 to} HDD 100 each having a built-in hard disk as a recording medium are used, and the number of video channels is 1000. Also,
In this embodiment, a video signal (including an audio signal) is compression-encoded to 1.5 Mbps by the MPEG1, and the compression-encoded video signal (including an audio signal) is recorded on the 100 hard disk drive devices HDD ₁ ~ An example is shown in which the data is dividedly recorded in the hard disk built in the HDD ₁₀₀ and is output to the above-mentioned 1000 channels. Further, in the present embodiment, the throughput required for the hard disk drive devices HDD _{1 to} HDD ₁₀₀ is 1.5 × 1000 ÷ 100 = 15 Mbps,
Access to the hard disk is 100 units × accessed 10 times of the hard disk drive HDD ₁ ~HDD _100, frame access time time unit block × 1
0 times = 200 milliseconds × 10 = 2 seconds.

In FIG. 2, the output terminals 5 _{1 to} 5 ₁₀₀₀
The output video signal of each video channel is output from
A command signal, which is a request for program name of each video channel, play (playback), stop (stop), etc., is supplied to the terminals 6 _{1 to} 6 ₁₀₀₀ . The request by the command signal is independently made for each of the 1000 video channels.

Each of the ₁₀₀ hard disk drive devices HDD _{1 to} HDD ₁₀₀ has a built-in hard disk as a disk-shaped recording medium, and the read unit block at the time of access is 500 kilobytes. When reading this unit block, the head is read. It takes 200 milliseconds including the seek time and the disk rotation waiting time. It should be noted that this is a value that is possible with current hard disk drive devices.

Each hard disk drive device HDD _1-
The outputs of the HDD ₁₀₀ are so-called SCSI (small
computer system interface) type interface 2
_It is sent to a buffer memory (hereinafter referred to as disk buffers DB _{1 to} DB ₁₀₀ ) via _{1 to} 2 ₁₀₀ . The disk buffers DB _{1 to} DB ₁₀₀ are buffer memories that temporarily store read data from the hard disks of the hard disk drive devices HDD _{1 to} HDD ₁₀₀ , and have a FIFO (first in first out) capacity of 500 kilobytes per unit block. ) Memory. ₁₀₀ disk buffers DB _{1 to} DB 100 are provided corresponding to each of the hard disk drive devices HDD _{1 to} HDD ₁₀₀ . The data held in these disk buffers DB _{1 to} DB ₁₀₀ is then 62.times. With a 64-bit width and 30 MHz period during a period when an output enable signal OE described later is "1" (H level).
It is output to the data bus in 2 milliseconds as 5 kilowords.

The above data bus is used for each disk buffer D.
A data bus that accommodates data from B _{1 to} DB ₁₀₀ in a time-division manner and is compatible with 30 megahertz with a width of 64 bits. The data from the disk buffers DB _{1 to} DB ₁₀₀ are arranged in order every 2 milliseconds. It will be.

The data from the data bus is 1000
It is sent to the buffer memory corresponding to the channel (hereinafter referred to as channel buffers CB _{1 to} CB ₁₀₀₀ ). The channel buffers CB _{1 to} CB ₁₀₀₀ have the write enable signal WE, which will be described later, set to “1” for the data on the data bus.
It is a buffer memory that is taken in during the period of (H level), which is twice the disk buffers DB _{1 to} DB ₁₀₀ and 1
It is composed of a FIFO memory having a megabyte capacity.

That is, the disk buffers DB _{1 to} DB ₁₀₀ and the channel buffer CB ₁ via the above data bus.
To CB ₁₀₀₀ , the output enable signal OE
Disk buffer D where is "1" (H level)
The data from B is the write enable signal WE
Channel buffer C where "1" (H level)
Sent to B. The above channel buffers CB _{1 to} CB ₁₀₀₀
Output at a rate of 1.5 Mbps, corresponding to each channel buffer CB ₁ to CB ₁₀₀₀ (i.e. corresponding to each video channel) is transmitted to the decoder ₄₁ to _1000.

Each of the decoders 4 ₁ to 4 ₁₀₀₀ decompresses the MPEG1 compression-encoded data supplied from the corresponding channel buffers CB _{1 to} CB ₁₀₀₀ , in accordance with the compression encoding. To restore the video signal (including the audio signal) and output the restored video signal (including the audio signal) to the corresponding output terminals 5 ₁ to
5 Output to ₁₀₀₀ .

Further, the disk access matrix circuit 8 of FIG. 2 corresponds to the access of each hard disk drive device HDD _{1 to} HDD _{100 in} the frame and the channel using them, that is, the disk buffer DB ₁ to.
It manages the disk access matrix information of 100 rows and 10 columns showing the correspondence between the DB ₁₀₀ and the channel buffers CB _{1 to} CB ₁₀₀₀ , and this disk access matrix information is the above 100 hard disk drive devices HD.
It corresponds to accessing the hard disk 10 times for each frame in D _{1 to} HDD ₁₀₀ .

In the above disk access matrix information
Each row of the matrix in
Each hard disk drive HDD₁~ HDD₁₀₀Within
Shows the usage status of the hard disk of the
Disk drive device HDD₁The internal hard disk
The second line shows the hard disk drive HDD ₂
The usage status of the hard disk in the
Eyes are hard disk drive HDD₁₀₀Hard in
Indicates the disk usage status. Also, each column of the matrix
Shows each hard disk drive as shown in FIG.
Device HDD₁~ HDD₁₀₀Access to the internal hard disk
Shows that the first column is the first access,
The second row is the second access, and so on.
Indicates that it is the 0th access. For example, Matrice
41st row and 7th column of the disk
HDD₄₁And the destination of the data obtained in the 7th access
Shows the number of the channel buffer CB. In addition, this
In Trix, all content moves up one line for each frame
It

The disk access matrix information is created in the memory of the controller CPU 7, and the timing generator 9 is based on the disk access matrix information from the disk access matrix circuit 8 and the disk buffer DB.
₁ to the output enable signal OE indicating the data output timing of DB _{100, and} the channel buffer CB ₁
A write enable signal WE indicating the timing of writing data to CB ₁₀₀₀ is generated.

In the timing generator 9, the 100th column of the first column of the disc access matrix corresponds to the disc buffers DB ₁ to DB ₁₀₀ according to the disc access matrix information, and the output enable signal OE is sequentially generated based on this. Also, in synchronization with this, the write enable signal WE is generated by the disc access matrix information and the channel buffer CB ₁ is generated.
~ Give to CB ₁₀₀₀ .

Both the output enable signal OE and the write enable signal WE have a width of 2 milliseconds as shown in FIG. 3B, in which 500 kilobytes of data are 64 bytes.
The bit width is 33 nanoseconds per cycle, and it takes 625,000 cycles to transfer from the disk buffer DB to the channel buffer CB.

The controller CPU 7 has terminals 6₁
~ 6₁₀₀₀Command signal which is the request of each channel from
And receive requests for program name, play, stop, etc.
Based on this command signal, each hard disk
Drive device HDD₁~ HDD ₁₀₀And the disk buff
DB₁~ DB₁₀₀And channel buffer CB₁~ CB_Ten
00To control. In addition, each hard disk drive
Live device HDD₁~ HDD₁₀₀Each hard di in
After determining the access contents of the disk,
Create tricks information.

Here, an example of the operation in the configuration of FIG. 2 will be described with reference to FIG. First, it is assumed that a command signal of a video channel of a certain channel, for example, the channel CH21 requests reproduction of a certain program.

The controller CPU 7 checks the hard disk in which the beginning part of the program is recorded. For example, it is a hard disk drive device HDD
_Suppose it was ₉₈ .

The controller CPU 7 checks whether there is an unused area (empty area) at the 98th line of the disk access matrix of FIG. 3A. Immediately if there is an unused portion, wait for the frame time until the unused portion occurs on the 98th line if there is no unused portion, and then add the hard disk drive HD.
Instruct D ₉₈ to read a predetermined recording block. At the same time, the controller CPU 7 sets the channel buffer C in the first column of the 98th row of the disk access matrix.
Writes the information of the number of B _21.

[0060] The timing generator 9, by the first column of the 98 line of the disk access matrix has number information of the channel buffer CB _21, giving the 98-th write enable signal WE in the frame to the channel buffer CB _21.

As a result, the data read from the hard disk drive device HDD ₉₈ is once held in the disk buffer DB ₉₈ and then written in the channel buffer CB ₂₁ via the data bus.

In the next frame, the next data is transferred from the hard disk drive device HDD ₉₉ to the channel buffer CB.
After writing _21, video playback requesting the channel by outputting data from the hard disk drive HDD ₉₈ to the decoder 4 ₉₈ is started. It should be noted that, in this way, data of two frames is stored in the channel buffer CB.
This is because the video output may be interrupted if it is not held in.

Next, the disk access matrix is
The controller CPU 7 moves the contents by +1 in the row direction for each frame. As a result, the video signals divided and recorded in order of the hard disk drive device are continuously reproduced.

To give a video output to a new video channel, or change the playback position (by FF, REW or jump) even if it is already in use,
The free state of the disk for the requested program is checked, and the channel buffer number corresponding to the disk access matrix is written at the time of the available frame.

When a video channel in use stops using, the corresponding channel buffer number portion in the disk access matrix is erased.

Next, the operation of the controller CPU 7 of the above apparatus will be described with reference to the flowchart of FIG.

First, when the frame time has elapsed in step S1, each row of the disk access matrix is moved up one row in step S2.

In step S3, it is determined whether or not there is a change in the state of the video channel. If it is determined that there is a change in state, the process proceeds to step S4, and if it is determined that there is no change, the process proceeds to step S8.

In step S4, for example, it is determined whether a reproduction request for the program P is supplied from a certain j channel as a command signal or a reproduction stop request for the j channel is supplied as a command signal. In step S4, if it is a reproduction stop request, the process proceeds to step S13, and if it is a program P reproduction request, the process proceeds to step S5. The command signal is not
When indicating F, REW, jump, etc., the process proceeds to the step corresponding to them.

In step S5, the hard disk drive device HDD recorded at the beginning of the program P
The information indicating (i) is searched by the file allocation table (FAT) of the CPU.

In the next step S6, it is determined whether or not there is an empty area E on the i-th row of the disk access matrix. If it is determined in step S6 that the sky area E exists, step S7 is performed. If it is determined that there is no sky area E, step S7 is performed.
Go to 8.

In step S7, the empty area E on the i-th row of the disk access matrix is rewritten to j.

In step S13 when it is determined that the reproduction is stopped in step S4, j is erased from the disk access matrix and rewritten to the empty area E, and then,
Go to step S8.

In the case where it is determined that it is not the above step S3, the case where it is determined that there is no empty area in the step S6, and the step S8 which follows the steps S7 and S13, the hard disk drive corresponding to each column k of the disk access matrix. Access the drive device.

In step S9, the hard disk drive device in the kth column of the disk access matrix is set to CP.
The file allocation table (FAT) of U is searched, the access is executed, and the data is loaded from the hard disk drive device to the disk buffer.

In step S10, the data is transferred from the disk buffer corresponding to the kth column of the disk access matrix to the channel buffer, and in the next step S11, it is determined whether or not the kth column of the disk access matrix has become the 100th column. To do. If YES in step S11, the process returns to step S1, and if NO, the process proceeds to step S12.

In step S12, k is incremented by 1, and the process returns to step S9.

According to the recorded information reproducing method and apparatus of the embodiment of the present invention, in the parallelized hard disk drive apparatus, the buffer memory capacity required for each video channel is set to the burst-like data amount obtained from one hard disk drive apparatus. The whole system can be operated at high throughput while keeping the same. In other words, the total buffer memory capacity in multiple channels can be small. In other words, when multiple disks are used, the buffer capacity is increased by increasing the number of channels while keeping the data block size during disk access small for one disk in order to increase the number of channels available. It can be suppressed to the first power of.

For example, as in the above-mentioned embodiment, 1.5M
Not only in the case of bps × 1000 channels, but also 15 Mb
The total buffer memory capacity does not change even if the output bit rate is changed, such as ps × 100 channels or 150 Mbps × 10 channels. That is, according to this embodiment, various bit rates can be supported without changing the scale. If the recording capacity of a single hard disk drive is 1 gigabyte, the capacity of the buffer memory of 500 megabytes is sufficient for 1000 channels.

Although the disk-shaped recording medium as described above is used as the recording medium in this embodiment, any other recording medium capable of random access may be used. For example, a semiconductor memory or a semiconductor memory is used. So-called IC
It may be a card or a tape-shaped recording medium such as a magnetic tape as long as it can be accessed at high speed.

[0081]

As is apparent from the above description, in the recorded information reproducing method and apparatus of the present invention, the same frame time is set for all recording media and this frame is set for each recording medium. Access is performed within a predetermined number of times within the time, and an information signal recorded in block units is read from each recording medium for each access, and is read from one recording medium only once within one frame time. By storing the information signal by a predetermined size for each of a plurality of channels, it is possible to increase the storage capacity, that is, reduce the capacity of the buffer memory. In addition, in the next frame time when the information signal read from one of the plurality of recording media is stored in one frame time,
By extracting the information signal from the next recording medium in which the information signal continuous with the information signal read out from the one recording medium is recorded, the continuous information signal, for example, the video / audio signal is not interrupted. It becomes possible to reproduce.

Further, according to the recorded information reproducing apparatus of the present invention, the information reading means uses the matrix information indicating the correspondence between each recording medium access and each channel within the frame time, so that the information reading means It is possible to send the information signal read from one recording medium only once within one frame time to the storage means for storing a predetermined size, and therefore, the capacity of the buffer memory can be reduced. Becomes

Further, by using a disc-shaped recording medium as the recording medium, it becomes easy to randomly access and read the recorded information, and therefore, for a storage means for storing a predetermined size for each plurality of channels. 1
It becomes easy to send the information signal read from one recording medium only once within the frame time.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a basic operation of a recorded information reproducing method and apparatus according to an embodiment of the present invention.

FIG. 2 is a block circuit diagram showing a specific configuration of the recorded information reproducing apparatus of the embodiment of the present invention for realizing the recorded information reproducing method of the embodiment of the present invention.

FIG. 3 is a diagram for explaining a disk access matrix and how data is transferred from a disk buffer to a channel buffer.

FIG. 4 is a flowchart for explaining the operation of the controller CPU.

FIG. 5 is a diagram for explaining the flow of data at the time of recording / reproducing of a plurality of conventional disk recording / reproducing devices.

[Explanation of Codes] HDD Hard Disk Drive 2 Interface DB Disk Buffer CB Channel Buffer 4 Decoder 7 Controller CPU 8 Disk Access Matrix Circuit 9 Timing Generator

Claims (7)

[Claims] 1. A plurality of continuous information signals are divided into a plurality of continuous unit blocks, information of each block is distributed in block units, and information of each distributed block is sequentially recorded in parallel. In the recording information reproducing method for continuously reproducing the recorded information signal from the recording medium, the same frame time is set for all recording media, and for each recording medium, within a predetermined number of times within this frame time. Access is performed, the recorded information signal is read in block units from each recording medium for each access, and one recording medium is accessed only once within the predetermined number of accesses within one frame time. A recorded information reproducing method, characterized in that the information signal read from the memory is stored in a predetermined size for each of a plurality of channels. 2. When the information signal read from one of the plurality of recording media is stored in one frame time, the information signal read from the one recording medium is continuously stored in the next frame time. 2. The recorded information reproducing method according to claim 1, wherein the information signal from the next recording medium recording the recorded information signal is stored. 3. A plurality of continuous information signals are divided into a plurality of continuous unit blocks, information of each block is distributed in block units, and information of each distributed block is sequentially recorded in parallel. In a recording information reproducing apparatus for continuously reproducing the recorded information signal from a recording medium, a plurality of storage means each having a capacity of a predetermined size corresponding to each of a plurality of channels, and The same frame time is determined, and each recording medium is accessed within a predetermined number of times within this frame time, and the information signal recorded in the block unit for each access from each recording medium. And an information reading unit for reading the information, wherein the information reading unit reads one of the accesses within the predetermined number of times within one frame time to each storage unit. A recorded information reproducing apparatus characterized by transmitting an information signal read from one recording medium only once. 4. The information reading means sends an information signal read from one recording medium of the plurality of recording media to the storage means in one frame time, and then the information signal is read in the next frame time. 4. The recorded information reproducing apparatus according to claim 3, wherein the information signal is read from the next recording medium on which an information signal continuous with the information signal read from one recording medium is recorded and sent to the storage means. 5. The information reading means reads out an information signal from each recording medium based on matrix information indicating a correspondence between each recording medium within the frame time and each channel, and reads out each information signal from each recording medium. 4. The recorded information reproducing apparatus according to claim 3, wherein transmission of the information signal to the storage means is controlled. 6. The recorded information reproducing apparatus according to claim 3, wherein the predetermined size is equal to two of the blocks. 7. The recorded information reproducing apparatus according to claim 3, wherein the recording medium is a disc-shaped recording medium.