JPH04168661A - Recording device - Google Patents

Abstract

PURPOSE:To enable a high-speed recording of a disk reproduction information to be constituted with a simple configuration by providing first or second reproduction means for reproducing a disk from a normal direction and an opposite direction and then recording the reproduction output on a first track and a second track of a tape which is running in each one direction simultaneously. CONSTITUTION:A CD reproduction device 1 reproduces CD (disk) digital information in normal reproduction state of a CD player, performs a specified processing, performs conversion to an analog signal before output. A CD reproduction device in opposite direction 2 is a device with a CD player function for reproducing CD information in opposite direction (in direction toward the end of a music), performs a specified processing to digital signal which is read from a disk, and then generates reproduction analog signal from direction of end of the program. Then, a 4ch recording device 3 records reproduction signal in forward direction on a track which is sent in forward direction and then records reproduction signal which is reproduced in backward direction on a track which is run in opposite direction, thus enabling both surfaces A and B to be recorded simultaneously at high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a recording device, and more particularly to a recording device that enables high-speed recording and recording with good sound quality.

(Prior Art) Conventionally, when recording disc recording information played back by a CD player with a recording device such as a cassette tape recorder or an oven tape recorder, the disc is rotated in one direction to be played back, and the playback signal is passed through the tape. The outbound and return tracks are recorded separately.

(Problems to be Solved by the Invention) As described above, in a recording device for disc reproduction information reproduced by a conventional CD player, a recording time corresponding to the traveling time of a cassette tape or the like is required for the outward and return trips.

In order to reduce this recording time in half, the CD player should be operated at double speed and the tape running speed on the tape side should be doubled for recording.

However, in order to increase the playback speed of a CD player, it is necessary to increase the digital signal processing speed within the CD player, and this is difficult to achieve because there is a limit to increasing the processing speed of digital systems. Furthermore, building a high-speed processing digital system also poses a problem in terms of cost.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a recording device that enables high-speed recording of disc playback information of a CD player with a relatively simple configuration.

(Means for Solving the Problems) In order to solve the above-mentioned problems, a recording device according to the present invention includes: a first playback unit that plays back a disc from a normal direction; and a second playback unit that plays a disc from a reverse direction. and recording means for simultaneously recording the reproduction outputs from the first and second reproduction means on a first track and a second track of a tape running in one direction, respectively. Ru.

(Function) In this invention, when reproducing recorded information from a disc in a CD player, a regular reproduction signal is obtained by rotating the disc in the regular direction and reproducing from the regular direction, and a regular reproduction signal is obtained by reproducing the disc from the opposite direction. and the reverse direction playback signal,
High-speed recording is achieved with a relatively simple configuration by simultaneously recording, for example, on tracks A and B of a cassette tape running in one direction.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a basic configuration block diagram showing an embodiment of a recording device according to the present invention.

The CD playback device N1 plays C in the normal CD player playback state.
D (disc) Digital information is reproduced, subjected to predetermined processing, converted to an analog signal, and output.

The reverse CD playback device 2 is a device that has a CD player function that plays CD information in the reverse direction (toward the end of the song), and performs predetermined processing on the digital signal read from the disc to play the CD information in the direction toward the end of the song. Generates a playback analog signal from.

4ch recording device W4 is a recording device capable of 4ch recording,
The playback signal played in the forward direction is recorded on a correspondingly determined track that is sent (traveled) in the forward direction, and the playback signal played in the reverse direction is recorded in the reverse direction, which is the opposite direction to the above-mentioned forward direction. Record to the track that is being driven.

FIGS. 2(A) and 2(B) show how a cassette tape recorder and an open tape recorder record on tape. Both the A-side track and the 8-side track have an L (left) channel and an R (right) channel, and the running direction of each track is the same.

Now, when the 8th side track (a track that is played in the opposite direction) is sent in the same direction as the A side track and played back, the sound will be played back in the opposite direction to that at the time of recording. Therefore, if the opposite reproduction sound is recorded for the 8th side track by sending it in the same direction as the A side track, normal reproduction sound can be obtained by sending the 8th side track in the normal direction and playing it back.

Reverse playback of the reverse CD playback device 2 in FIG. 1 can be performed by adopting the following configuration.

That is, when information recorded on a CD is reproduced in the reverse direction, the recorded digital data will appear in the reverse direction, so it is first necessary to perform processing to restore the normal direction data. thus,
After performing predetermined processing based on the digital signal returned to the normal direction data, a reverse direction reproduction analog signal is obtained by conversion to an analog signal by a DAC; 4. ch Send to recording device 3.

In addition, after the TOC information is read from the disc by the pickup of the CD player, the rotation direction of the disc is reversed, the pickup is moved to the outer circumference, and the digital data recorded on the disc is played back in the reverse direction by tracing from the outer circumference to the inner circumference. can.

In addition, the PL that reproduces the clock for reading digital data
Since the L circuit operates on the edge of digital data, there is no problem even if the digital data is read and reproduced in the opposite direction.The CLV circuit operates on the master clock and P L,
Since the phase is compared with the frequency clock reproduced by the L circuit and the control is performed based on the comparison result, it can be operated simply by reversing the polarity of the drive circuit. In other words,
Since it is driven using an operational amplifier or the like, it can be operated by simply changing the operation of the operational amplifier to an inverting amplifier if it is a non-inverting amplifier, or vice versa if it is an inverting amplifier. Furthermore, servo control operations such as focus servo, tracking servo, and thread servo operate without any changes.

Next, a circuit for converting one frame of digital data reproduced in the reverse direction will be described.

In FIG. 3, the backward playback digital data is 588
The data is taken into the bit shift register 21.

The frame synchronization detection circuit 22 detects a frame synchronization signal (transfer signal) from the backward reproduction digital data. In response to this detected frame synchronization signal, shift register 2
Data from 1 to 564 bits is transferred in parallel to another 565-bit shift register 23.

The data stored in the shift register 23 is read out using the same clock as the reading clock, and the reversely arranged data is eventually restored to the original one frame of data every frame. The thus restored data is descrambled within the frame by conventional circuit means and converted into an 8-bit code of subcode, data, and parity.

Demodulation of subcodes in data is performed using one Q per frame.
The data is separated from the subcode and input to a 98-bit shift register 31 as shown in FIG.
A shift operation is performed using the shift clock (transfer signal) detected in step 2. S. And S! When the synchronization signal of the subcode is detected, 80 bits of data and 16 bits of CRC are restored to 96 bits in the shift register 31 as a Q code.

Regarding error correction, no particular problem arises since CI errors are completed within one frame, but C2 error correction requires data of the subsequent 108 frames including the signal to be corrected. Therefore, it is necessary to start the reproduction from 108 frames after the signal to be reproduced and to perform reproduction backwards, and a large-capacity RAM is prepared for data storage.

One frame has audio signals of 6 Lchs and 6 Rchs.
It contains six pieces of digital audio data, and in order to capture one frame of data, the signals are not in the reverse direction but in the normal order within one frame. Therefore, if the signal is sent as it is to the DAC, the six data on each channel will be reproduced in the normal direction, so it is necessary to replace the data when sending the six data in one frame to the DAC. A mode of this replacement is shown in FIG.

In Fig. 5, the numbers assigned to each data indicate the order in which it should be output, and 6 data numbers 1 to 6 (1 in stereo)
2 pieces) are output in a different order for every 16 bits of data.

Reverse playback becomes possible through the processing described above.

(Effects of the Invention) As explained above, in this invention, it is possible to simultaneously record the A side track and the 8th side track of a cassette tape or oven tape, which is twice as many times as compared to the conventional recording device that records back and forth. It is possible to record at speeds of Furthermore, when recording for the same amount of time, it is possible to record at half the speed (when recording in a round trip or at double speed, it becomes constant speed recording), so high quality recording is possible.

[Brief explanation of drawings]

FIG. 1 is a basic configuration block diagram showing an embodiment of a recording device according to the present invention, FIGS. 2(A) and (B) are diagrams showing recording modes on a cassette tape and an oven tape, and FIG. 3 is a reverse view. FIG. 4 is a diagram showing an example of a circuit for converting directional reproduction digital data into one frame data, FIG. 4 is a diagram showing a subcode detection operation, and FIG. 5 is a diagram showing an operation for exchanging output data to a DAC. 1... CD playback device, 2... Reverse CD playback device, 3... 4ch recording device, 21.23.31--shift register, 22... Frame synchronization detection circuit. Agent Patent Attorney Masahiro Fukuyama Figure 2 (A) Figure 2 (B)

Claims (1)

[Scope of Claims] First reproducing means for reproducing the disc from the normal direction; second reproducing means for reproducing the disc from the reverse direction; and reproduction outputs from the first and second reproducing means. A recording device comprising: recording means for simultaneously recording on a first track and a second track of a tape running in one direction.