JP3185330B2 - Multi-channel recording device, multi-channel playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus for recording / reproducing music and the like using a small magneto-optical disk.

[0002]

2. Description of the Related Art For example, a so-called mini disk (M) for recording and reproducing music and the like using a small magneto-optical disk.
A disk system called D) has been proposed (see Japanese Patent Application No. Hei 3-275067).

On the other hand, for example, when recording and reproducing the performances of a plurality of musical instruments, it is conceivable that the recording and reproduction are performed using independent channels so that the signals of each channel are independently adjusted to perform better recording and reproduction. Have been. However, the mini-disc (MD) described above is conventionally designed to record and reproduce a so-called stereo two-channel signal, and cannot record or reproduce three or more channels as it is.

[0004] By the way, the mini disk (M
In the recording / reproducing apparatus D), the input signal is temporarily written to a memory, then compressed on a time axis and intermittently recorded on a disk. The present invention has been made in view of such a point.

[0005]

The problem to be solved is that the conventional apparatus cannot perform recording and reproduction on three or more channels.

[0006]

According to the present invention, a plurality of compression means for compressing a plurality of input signals by different compression methods, respectively, and one of the plurality of compression means is used for processing by one of the plurality of compression means. Each of the divided first input signal and the second input signal processed by the other compression processing means among the plurality of compression means is divided into a plurality of recording areas divided on a disk radius.
Multi-channel recording apparatus comprising a recording means for recording in each of the band and the other recording area, and a plurality of upper disk
The recording area divided into a plurality of recording areas
Processed by one compression processing means reproduced from one recording area
First decompression means for decompressing the obtained digital signal,
Playback from other recording areas
Expands digital signals processed by other compression processing means.
The second extension means and the first extension means
Digital signal and the data expanded by the second expansion means.
And a reproducing means for reproducing digital signals in parallel .

[0007]

According to this, different signals are processed by a plurality of systems of circuits, and these processed data are recorded / reproduced in parallel on a disk, thereby recording / reproducing three or more channels with a simple configuration. be able to.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes an input terminal for audio signals of, for example, first and second channels. Reference numeral 21 denotes an input terminal for audio signals of the third and fourth channels, for example. The audio signals from these input terminals 1 and 21 are supplied to A / D converter circuits 2 and 22, respectively, to form digital data. The data from these circuits 2 and 22 are supplied to ATRAC encoder / decoder circuits 3 and 23 for audio compression, respectively.

The encoded data from the encoder / decoder circuits 3 and 23 are alternately taken out for each predetermined block by a switch 24, and the shock-proof data is output.
The data is written to the DRAM 5 through the memory controller 4. Each of the circuits 3 and 23 has a built-in buffer memory.
Written to M5.

Further, 6 is a CP for system control.
U, the control of the entire apparatus is performed in response to a signal from the operation unit 7, and the control state and the like are displayed on the display unit 8. Then, communication is performed between the CPU 6 and the controller 4, and when a predetermined amount of data is accumulated in the DRAM 5, the data is read out and recorded.

That is, the data read from the DRAM 5 through the controller 4 is converted into an 8-14 conversion (E
FM) and error correction coding (CIRC) encoder / decoder circuit 9, and the encoded data from this circuit 9 is supplied to a head drive circuit 10. As a result, the magnetic field of the recording head 11 is changed, and the change in the magnetic field is supplied from the upper surface of the mini disk (MD) 12.

Further, a signal from the CPU 6 is transmitted to the servo circuit 1
The laser beam is supplied to the optical pickup 14 through the optical disc 3 and is irradiated with laser at a predetermined timing from the lower surface of the mini disc (MD) 12. At this time, the optical pickup 1
4 and the spindle motor 15 of the mini disk (MD) 12 are controlled and driven by a signal from the servo circuit 13. Thus, the audio signal supplied to the input terminal 1 is recorded on the mini disc (MD) 12.

On the other hand, at the time of reproduction, a signal from the optical pickup 14 is supplied to the encoder / decoder circuit 9 through the RF amplifier 17. Further, a signal from the RF amplifier 17 is supplied to the address decoder 18, and a cluster number corresponding to an absolute address on the mini disk (MD) 12 is determined. The cluster number from the address decoder 18 is transmitted to the CPU through the encoder / decoder circuit 9.
6. Thus, the optical pickup 14 is moved to a recording area where desired data is recorded.

Further, the data decoded by the encoder / decoder circuit 9 is transmitted to the DRAM through the controller 4.
5 is written. When a predetermined amount of data is stored in the DRAM 5, the data is read out by a signal from the CPU 6, alternately distributed for each predetermined block by the switch 24, and supplied to the encoder / decoder circuits 3 and 23. .

The data decoded by the encoder / decoder circuits 3 and 23 are supplied to D / A converter circuits 19 and 25, respectively. The data alternately distributed for each predetermined block by the switch 24 is written to a buffer memory incorporated in each of the circuits 3 and 23, and the synchronized and decoded data is supplied to the D / A converter circuits 19 and 25, respectively. Is done.

A signal converted into an analog signal by the D / A converter circuit 19 is output to, for example, an output terminal 20 for audio signals of the first and second channels. The signal converted into analog by the D / A converter circuit 25 is, for example, a third signal.
And an output terminal 26 for the audio signal of the fourth channel. In this way, mini disk (MD)
12 is reproduced and output terminals 20, 2
It is taken out to 6.

Therefore, in this apparatus, data of the audio signals of the first and second channels from the encoder / decoder circuit 3, as shown in FIG. .. And the data ',', '... Of the audio signals of the third and fourth channels from the encoder / decoder circuit 23 are alternately recorded in parallel.

Alternatively, as shown in FIG. 3B, data of audio signals of the first and second channels from the encoder / decoder circuit 3,..., And third and fourth audio signals from the encoder / decoder circuit 23 are output. .. Are recorded in parallel in independent recording areas.

At the time of reproduction, the respective data are distributed to the encoder / decoder circuits 3 and 23, and the audio signals of the first and second channels processed by the respective circuits 3 and 23 and the audio signals of the third and fourth channels are processed. The signal is taken out at respective output terminals 19 and 26.

According to the above-described apparatus, different signals are processed by the plurality of circuits 3 and 23, and the processed data (DRAM 5) is recorded and reproduced on the disk 12 in parallel. With this configuration, recording and reproduction of three or more channels can be performed.

In the above-mentioned apparatus, three or more systems for time axis compression such as the encoder / decoder circuits 3 and 23 are provided so that signals of five or more channels are processed and recorded / reproduced in parallel. Is also good.

In the above-described apparatus, when data is alternately recorded in parallel as shown in FIG. 2A, control of the optical pickup 14 and the like during recording and reproduction becomes easy. In the case where data is recorded in an independent recording area as shown in FIG. 3B, compatibility with ordinary two-channel recording and reproduction can be obtained.

[0023]

According to the present invention, different signals are processed by a plurality of circuits, and the processed data are recorded and reproduced in parallel on a disk, thereby recording three or more channels with a simple structure. Playback can now be performed.

[Brief description of the drawings]

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

FIG. 2 is a diagram for the explanation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Input terminal of the audio signal of the 1st and 2nd channel 2, 22 A / D converter circuit 3, 23 ATRAC encoder / decoder circuit for audio compression 4 Shock proof memory controller 5 DRAM 6 CPU for system control 7 Operation unit 8 Display unit 9 8-14 conversion (EFM) and error correction coding (CIR)
C) Encoder / decoder circuit 10 Head drive circuit 11 Recording head 12 Mini disk (MD) 13 Servo circuit 14 Optical pickup 15 Feed motor 16 Spindle motor 17 RF amplifier 18 Address decoder 19, 25 D / A converter circuit 20 For example, Output terminals of audio signals of first and second channels 21 Input terminals of audio signals of, for example, third and fourth channels 24 Switches 26 Output terminals of audio signals of, for example, third and fourth channels

Claims (2)

(57) [Claims] A plurality of compression means for compressing a plurality of input signals by different compression schemes; a first input signal processed by one of the plurality of compression means; Each of the second input signals processed by the other compression processing means of the plurality of compression means means
One recording area divided into multiple areas on the disc radius and another
Recording means for recording in each of the recording areas . 2. The disk is divided into a plurality of recording areas.
From one recording area of the plurality of divided recording areas.
Digital signal processed by one of the compressed processing means reproduced
A first decompression means for decompressing the recording area, and reproducing from another recording area of the plurality of divided recording areas.
Digital signal processed by other compression processing means
A second decompressing means, a digital signal decompressed by the first decompressing means,
Multichannel reproducing apparatus comprising a reproducing means for parallel reproducing a digital signal which is extended by the second expansion means.