JPH05274791A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To record and reproduce suitably even for the signal of either level of large and small. CONSTITUTION:An audio signal from an input terminal 1 is supplied to an A/D converter circuit 2 and supplied to the A/D converter circuit 22 through the attenuator 21 of e.g. -12dB, and digital data are formed respectively. The data from the circuits 2, 22 are supplied to sound compressing ATRAC encoder/ decoder circuits 3, 23 respectively. The encoded data from the circuits 3, 23 are picked up alternately at every prescribed block by a switch 24 and written in a DRAM 5 through a shockproof memory controller 4. Further, the data from the A/D converter circuit 2 is supplied to a CPU 6 and the distortion of the processed signal is detected and the detected signal is written in the DRAM 5 with the data from the switch 24. Then the data stored in the DRAM 5 is read and recorded.

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 or the like using a small magneto-optical disk.

[0002]

2. Description of the Related Art For example, a so-called mini disc (M
A disk system called D) has been proposed (see Japanese Patent Application No. 3-275067).

Generally, when recording / reproducing a signal, distortion or clipping occurs in the signal in recording / reproducing a high level signal. However, if such a high level signal is always assumed, the S / N may be deteriorated due to noise in the circuit system when recording / reproducing a low level signal. For this reason, conventionally, an intermediate level is set to determine the characteristics of the circuit and the like, but this is insufficient for both large level and small level signals.

By the way, the mini disc (M
In the recording / reproducing apparatus D), the input signal is once written in the memory, then time-axis compressed and intermittently recorded on the disk. The present invention has been made in view of these points.

[0005]

The problem to be solved is that the conventional device has insufficient circuit characteristics and the like for both high level and low level signals.

[0006]

According to the present invention, in a disk recording / reproducing apparatus in which a signal is time-axis compressed and recorded / reproduced intermittently on a disk 12, a plurality of systems (circuits) for performing the time-axis compression are provided. 3 and 23), the signals are changed in level (attenuator 21) and processed by the circuits of the plurality of systems, and the processed data (DRA
M5) is a disc recording / reproducing apparatus configured to record / reproduce M5) in parallel on the disc.

[0007]

According to this, signals are processed by circuits of a plurality of systems with different levels, and these processed data are recorded / reproduced in parallel on the disk, so that signals of either large level or small level can be obtained. Proper recording and reproduction can also be performed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is an audio signal input terminal, for example. The audio signal from the input terminal 1 is supplied to the A / D converter circuit 2 and is also supplied to the A / D converter circuit 22 through an attenuator 21 of, for example, -12 dB to form digital data. The data from these circuits 2 and 22 are supplied to the ATRAC encoder / decoder circuits 3 and 23 for audio compression, respectively. The encoded data from the circuits 3 and 23 are alternately taken out by the switch 24 for each predetermined block and written into the DRAM 5 through the shock proof memory controller 4.

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. In addition, the data from the A / D converter circuit 2 is CP
U6 is supplied to detect the distortion of the signal to be processed and this detection signal is passed through the shock proof memory controller 4 together with the data from the switch 24 to the DRAM.
Written to 5. Then, when communication is performed between the CPU 6 and the controller 4 and a predetermined amount of data is accumulated in the DRAM 5, this data is read and recording is performed.

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

Further, the signal from the CPU 6 is the servo circuit 1
It is supplied to the optical pickup 14 through the laser beam 3 and the laser is emitted from the lower surface side of the mini disc (MD) 12 at a predetermined timing. At this time, the optical pickup 1
The feed motor 15 of No. 4 and the spindle motor 15 of the mini disk (MD) 12 are controlled and driven by a signal from the servo circuit 13. In this way, the audio signal supplied to the input terminal 1 is recorded on the mini disc (MD) 12.

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

Further, the data decoded by the encoder / decoder circuit 9 is transferred to the DRAM through the controller 4.
Written to 5. Then, when a predetermined amount of data is accumulated in the DRAM 5, the data is read by a signal from the CPU 6, and the data is alternately distributed into predetermined blocks by the switch 24 and supplied to the encoder / decoder circuits 3 and 23. .. The data decoded by the circuits 3 and 23 is selected by the switch 25. Also DRAM
The detection signal written in 5 is supplied to the CPU 6 through the shock proof memory controller 4, and the selection by the switch 25 is controlled using this detection signal.

The data selected by the switch 25 is D
It is supplied to the / A converter circuit 19. Further CPU6
The detection signal from is supplied to the D / A converter circuit 19, and when the circuit 23 is selected by the switch 25, the level of the signal is quadrupled. And this D
The signal converted into an analog signal by the / A converter circuit 19 is taken out to the output terminal 20 of the audio signal, for example. In this way, the data recorded on the mini disc (MD) 12 is reproduced and taken out to the output terminal 20.

Therefore, in this apparatus, on the mini disk (MD) 12, for example, the data from the encoder / decoder circuit 3 processed from the original signal as shown in FIG. Encoder / decoder circuit 23 processed from a signal with a level of -12 dB smaller
, Data from, are recorded alternately in parallel. Further, signal distortion in the processing system of the original signal is detected, and this detected signal is inserted into the index area (ID) of each data.

At the time of reproduction, a detection signal is discriminated from the index area (ID) of each data, and based on this detection signal, -12 from the encoder / decoder circuit 23 is detected.
The processed signal is extracted from the signal having a level lower than dB, and the D / A converter circuit 19 controls to quadruple the signal level.

That is, for a large level signal in which distortion occurs, a processed signal is extracted in advance from a signal of a small level of -12 dB, and this signal is quadrupled in level by the D / A converter circuit 19. As a result, a signal without distortion can be taken out. By this, the dynamic range is apparently expanded by 2 bits.

Thus, according to the above-mentioned device, the level of the signal is changed (attenuator 21) and the circuits 3 and 2 of a plurality of systems are connected.
3 processed, these processed data (DRAM5)
By recording and reproducing data in parallel on the disk 12, it is possible to perform appropriate recording and reproduction with respect to both a large level signal and a small level signal.

In the above-mentioned apparatus, the encoder / decoder circuits 3, 23, etc. are provided with three or more circuits for time-axis compression so that signals of different levels are processed and recorded / reproduced in parallel. Good.

Further, in the above-mentioned apparatus, it is possible to detect distortion from the decoded signals from the encoder / decoder circuits 3 and 23 and perform switching. Therefore, in this case, it is not necessary to record the detection signal on the disk 12.

[0021]

According to the present invention, signals are processed by circuits of a plurality of systems with different levels, and these processed data are recorded / reproduced in parallel on the disk, so that either large level or small level can be obtained. It is now possible to perform proper recording / reproducing for the signal of.

[Brief description of drawings]

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

FIG. 2 is a diagram for explaining that.

[Explanation of symbols]

1 Audio signal input terminal 2, 22 A / D converter circuit 3, 23 Audio compression ATRAC encoder / decoder circuit 4 Shock proof memory controller 5 DRAM 6 System control CPU 7 Operation section 8 Display section 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 D / A converter circuit 20 For example of audio signal Output terminal 21 Attenuator 24, 25 switch

Claims (4)

[Claims] 1. A disc recording / reproducing apparatus for temporally compressing a signal for intermittent recording / reproducing on a disc, wherein a plurality of circuits for performing the temporal compression are provided to change the level of the signal. While processing with the circuit of the system,
A disc recording / reproducing apparatus adapted to record / reproduce these processed data in parallel on the disc. 2. The disc recording / reproducing apparatus according to claim 1, wherein distortion of the signal in the circuits of the plurality of systems is detected, and the detection signal is recorded / reproduced in parallel on the disc together with the data. 3. A detection signal which detects distortion of the signals in the circuits of the plurality of systems which are recorded / reproduced in parallel on the disk is discriminated, and the time axis compression is performed using the discriminated detection signal. The disc recording / reproducing apparatus according to claim 1, wherein a circuit is selected. 4. The data recorded and reproduced in parallel on the disk are processed by the circuits of the plurality of systems, distortion of the signal in the circuits of the plurality of systems is detected, and the detection signal is used to detect the distortion. The disc recording / reproducing apparatus according to claim 1, wherein a circuit for performing time axis compression is selected.