JPH10289533A - Disk access method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record or reproduce audio data in a minimum access time when recording or reproducing is performed to a disk at random. SOLUTION: A disk address management memory 4 and an address comparator 5 are connected with a CPU 2. The disk management memory 4 stores addresses on a disk 1 of split data composing a group of split data stored on a disk 1 in one access operation or a group of split data read from the disk 1 respectively. The address comparator 5 compares the addresses of each split data of the split data groups for units of one access operation, and sorts them in ascending order or descending order by size. The CPU 2 seeks tracks at the innermost radius of the disk 1 with a head, and accesses the data from the inner to outer radius in the disk 1 in order of the sorted addresses.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk access system for randomly recording or reproducing a plurality of channels of audio data on a disk recording medium such as an optical disk, a magneto-optical disk, and a magnetic disk.

[0002]

2. Description of the Related Art In a system such as a multi-track recorder that records or reproduces audio data of a plurality of channels using a disk recording medium, a temporally continuous process is performed during an editing operation such as punch-in, punch-out, and ping-pong recording. Audio data may be randomly recorded on a medium. For example, as shown in FIG.
Are divided into a plurality of recording areas P ₁ , P ₂ ,... From the inner peripheral side (or the outer peripheral side) to the outer peripheral side (or the inner peripheral side), for example.
In the state of a blank disk (unrecorded disk), N channels of audio data C are stored in each recording area P ₁ , P ₂ ,.
_1, C _2, ..., assuming that C _N is recorded, these data C _1, C _2, ..., C _N is the division data obtained by dividing the audio data for each channel in time, one The divided data C ₁ , C ₂ ,..., C _N recorded in the recording area Pi
Form a divided data group for making the reproduction timing equal.

FIG. 7A is a diagram showing a reproduction state.
In the first data read operation, the channels CH1 to C
The divided data P ₁ − constituting the divided data group up to HN
_{C 1, P 1 -C 2,} ..., P 1 -C N are read, they are played simultaneously. In the second data read operation,
Divided data _{P 2 -C 1, P 2 -C} 2, ..., P 2 -C N are read, they are played simultaneously. Hereinafter, this operation is repeated.

Here, in order to partially correct the audio data of the channel CH1, as shown in FIG.
When the divided data _{P 2 -C 1, P 4 -C} 1, P 7 -C 1 that to punch in a non-destructive, the new divided data for these, for example _{P 13 -C 1, P 1 3} -C 2, It is recorded in the P ₁₃ -C _3. Then, during playback, as shown in FIG. (C), for the channel _{CH1, P 1 -C 1, P 13} -
_{C 1, P 3 -C 1,} P 13 -C 2, it is necessary to read the audio data from the disk 1 by ... order of. Similarly, with respect to other channels, the audio data of each channel is gradually recorded at random positions on the disc as the editing work proceeds by punch-in, overdubbing, or the like. Further, the divided data P ₂ -C ₁ ,
When new data is recorded in an unnecessary area such as an area where P ₄ -C ₁ and P ₇ -C ₁ are recorded,
At the time of recording, it is necessary to access a random free area.

[0005]

[0007] Now, as shown in FIG. 8, random from the disk 1, the audio data is recorded in the case of reading the audio data of the channel C ₁ -C _5, conventionally, each channel data To C ₁ , C ₂ , C ₃ ,
Since the reading is performed in the order of C ₄ and C ₅ , there is a problem that a long seek time is required to read all the data, and the access time becomes long.

[0006] The present invention has been made in view of the above points, and provides a disk access method capable of recording or reproducing audio data in a minimum access time when recording or reproducing data on a disk at random. The purpose is to provide.

[0007]

According to the present invention, there is provided a disk access method according to the present invention for reproducing from a disk in which audio data of a plurality of channels is randomly recorded in the form of divided data temporally divided for each channel. In the disk access method relating to the reproduction of reproducing the audio data of each channel by collectively reading the divided data of each channel as one divided data group, each channel constituting each divided data group Address management means for storing an address at which the divided data are recorded, and an address for rearranging the addresses of the divided data of each channel read from the address management means when reading each of the divided data groups in ascending or descending order. Sorting means and addresses sorted by this means Reading means for reading the divided data of each channel constituting the divided data group from the disk in order, and reproducing means for reproducing the divided data of each channel read by this means for each channel. And

In the disk access method according to the present invention, the recording timing is the same for a disk on which audio data of a plurality of channels is randomly recorded in the form of divided data temporally divided for each channel. In the disk access method for recording the audio data of each channel by collectively writing the divided data of the channel as one divided data group, the divided data of each channel constituting the divided data group to be recorded is stored in the disk access system. Input means for inputting for each channel, address management means for storing an address at which divided data of each channel constituting each divided data group can be recorded, and address management means for writing each divided data group Recordable address of divided data of each channel read from Address rearranging means for rearranging the divided data in ascending or descending order, and writing means for writing the divided data of each channel constituting the divided data group on the disk in accordance with the order of the addresses rearranged by this means. Features.

According to the disk access method relating to the reproduction of the present invention, for each divided data group which is collectively read from the disk, the address where the divided data of each channel constituting the divided data group is recorded is stored. At the time of reading the divided data group, these addresses are rearranged in ascending or descending order, and the divided data of each channel is read from the disk in accordance with the rearranged address order. The divided data of all the channels can be read by one seek operation on the inner side (inner side). Therefore, data can be read from the disk in the shortest access time.

Similarly, according to the disk access method relating to recording of the present invention, for each divided data group which is collectively written to the disk, an address where divided data of each channel constituting the divided data group is recorded is stored. When writing each divided data group, these addresses are rearranged in ascending or descending order, and the divided data of each channel is written on the disk in accordance with the rearranged address order. ) To the outer circumference side (inner circumference side), the divided data of all the channels can be written by one seek operation. For this reason, data can be written to the disk with the shortest access time.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a disk recording / reproducing apparatus according to one embodiment of the present invention. Access to the disk 1 on which audio data is recorded is controlled under the control of the CPU 2.
This is performed via the SCSI controller 3. The disk address management memory 4 and the address comparator 5 are connected to the CPU 2. The disk management memory 4 is 1
The address on the disk 1 of the divided data constituting the divided data group written to the disk 1 or the divided data group read from the disk 1 in each access operation is stored. The address comparator 5 is a reordering unit that compares the addresses of the divided data of the divided data group that is a unit of one access operation, and reorders the addresses in ascending or descending order.

An audio data memory 6 and an audio data DSP (digital signal processor) 7 are also connected to the CPU 2. The audio data memory 6 is a buffer for temporarily storing data read from the disk 1 and data to be written to the disk 1. The DSP 7 performs signal processing on the data of each channel that has been input to the A / D converter 8 and has been A / D converted, and supplies the processed data to the CPU 2, or performs signal processing on the audio data supplied from the CPU 2 for each channel, and performs D / D processing. It is reproduced and output via the / A converter 9. The CPU 2 further includes an operation switch 10 for instructing reproduction and recording, and a display 11 for displaying information necessary for the operation and a recording / reproducing state.
Is connected.

Next, a description will be given of a reproducing operation using the disk recording / reproducing apparatus thus configured. FIG.
5 is a flowchart showing processing of the CPU 2 at the time of reproduction. When reproduction is instructed, first, an access number counter i
Is set to 1 (S1), and the address where the data of the first N channels is recorded is read from the disk address management memory 4 (S2). Then, the read address is passed to the address comparator 5, and the rearranged address is received from the inner peripheral side (S3).

For example, as shown in FIG. 3, it is assumed that audio data of channels CH1 to CH4 is recorded on the disk 1, and the recording positions on the disk 1 correspond to the respective recording positions of FIG. At the first access, P ₁ −C ₁ , P
_{18 -C 1, P 14 -C 2} , it is necessary to read P ₁ -C ₄ as divided data units. In this case, as shown in FIG. 4A, the disk address management memory 4 stores the addresses on the disk of all the divided data to be read in the first access, and the CPU 2 reads out these addresses. When the address is passed to the address comparator 5, the address comparator 5 outputs P ₁ -C ₁ , P ₁ -C ₄ , and P _{14 in} ascending order of address.
−C ₂ , P ₁₈ −C ₁

Next, the CPU 2 seeks the head (not shown) to the innermost circumference of the disk 1 and reads data from the inner circumference to the outer circumference of the disk 1 in the order of the rearranged addresses (S4). The read data is temporarily stored in the audio data memory 6 (S5), and reproduced and output as audio data for each channel via the DSP 7 and the D / A converter 9.

In the second access, as shown in FIG.
_{13 -C 1, P 18 -C 2} , P 14 -C 3, P 2 -C 4 it is necessary to read the divided data units, the disk address management memory 4, as shown in FIG. 4 (b) The addresses on the disk of all the divided data to be read in the second access are stored, and when the CPU 2 reads them out and passes them to the address comparator 5, the address comparators 5 read the addresses in, for example, order from the largest address. P ₁₈ -C _2, P ₁₄ -
C _3, sort as _{P 13 -C 1, P 2 -C} 4. In this case, data is sequentially read from the outer peripheral side to the inner peripheral side. Hereinafter, while the access counter i is incremented (S7), the same repetitive processing is executed, and when reading of data to be reproduced is completed (S7).
8), the reproduction process ends.

According to this device, the reading of one divided data group is completed by one movement of the head from the inner peripheral side to the outer peripheral side or from the outer peripheral side to the inner peripheral side. It can be greatly reduced. Further, as in this embodiment, if the odd-numbered access is performed from the inner side to the outer side and the even-numbered access is performed from the outer side to the inner side, the head moves to the initial position. This time is also reduced.

The present invention can be applied to recording. FIG.
5 is a flowchart showing processing of the CPU 2 when recording audio data. When recording is instructed, first, the access number counter i is set to 1 (S11), and data is transferred to the C / D converter via the A / D converter 8 and the DSP 7 for each channel.
The data is taken into the PU 2 (S12), and the input data is stored in the audio data memory 6 (S13). Then, the address of the recordable free area of the disk 1 is read out from the disk address management memory 4 for one access only (S14), and the read address is passed to the address comparator 5 to be transferred from the inner circumference to the outer circumference or the outer circumference. The addresses rearranged from the side to the inner side are received (S15). And
Based on the received address, data is written to the specified address of the disk 1 by one seek operation from the inner circumference to the outer circumference or from the outer circumference to the inner circumference (S16).

Thereafter, while the access counter i is incremented (S17), the same repetitive processing is executed, and when writing of data to be recorded is completed (S1).
8), end the recording process. As a result, it is possible to perform recording with a minimum access time even during recording.

[0020]

As described above, according to the present invention,
For each divided data group that accesses the disk collectively,
The addresses of the divided data of each channel constituting the addresses are stored, and these addresses are rearranged in ascending or descending order at the time of access, and the disk is accessed in accordance with the rearranged addresses. With a single seek operation from the peripheral side (outer peripheral side) to the outer peripheral side (inner peripheral side), the access of the divided data of all the channels is completed, and the access time can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a disk recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing processing at the time of reproduction using the apparatus.

FIG. 3 is a diagram showing data of each channel read at the time of the reproduction.

FIG. 4 is a view for explaining rearrangement of addresses of data of each channel.

FIG. 5 is a flowchart showing processing at the time of recording using the same apparatus.

FIG. 6 is a diagram showing a recording area of a disc and audio data to be recorded.

FIG. 7 is a diagram for explaining a reproduction order of data recorded on the same disk.

FIG. 8 is a diagram for explaining a conventional access method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk, 2 ... CPU, 3 ... SCSI interface, 4 ... Disk address management memory, 5 ... Address comparator, 6 ... Audio data memory, 7 ... Audio data DSP, 8 ... A / D converter, 9 ... D / A converter, 10 ... operation switch, 11 ... display.

Claims (2)

[Claims] 1. Divided data of each channel having the same reproduction timing from a disk in which audio data of a plurality of channels are randomly recorded in the form of divided data temporally divided for each channel as one divided data group. Address management means for storing, in each of the divided data groups, an address at which divided data of each channel constituting the divided data group is recorded, in a disk access system relating to reproduction of reproducing the audio data of each of the channels by reading out the audio data in a specific manner. An address rearranging unit that rearranges the addresses of the divided data of each channel read from the address management unit when reading each of the divided data groups, in ascending order or descending order; Each of the disks constituting the divided data group A disk access apparatus for reproduction, comprising: a read unit for reading the divided data of a channel; and a reproducing unit for reproducing the divided data of each channel read by the unit for each channel. 2. The divided data of each channel having the same recording timing on a disk on which audio data of a plurality of channels is randomly recorded in the form of divided data temporally divided for each channel as one divided data group. In a disk access method related to recording in which audio data of each channel is recorded by writing at a time, input means for inputting divided data of each channel constituting a divided data group to be recorded for each channel, Address management means for storing an address at which divided data of each channel constituting each divided data group can be recorded; and writing of the divided data of each channel read from the address management means at the time of writing of each divided data group. Address arrangement that sorts recordable addresses in ascending or descending order A disk access device for reproduction, comprising: a switching unit; and a writing unit that writes the divided data of each channel constituting the divided data group on the disk in accordance with the order of the addresses rearranged by the unit.