JPH0648579Y2 - Variable speed synchronous recording device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a variable-speed synchronous recording device, and particularly to recording from a digital recording / reproducing digital recording device to an analog recording / reproducing rotary analog recording device. The present invention relates to a variable speed synchronous recording device that can be performed without being affected by speed deviation, wow and flutter, and the like.

(Prior Art) When two read / write devices are used to record a signal read from one on the other recording medium, it is necessary to set both devices in a synchronized state. Especially when variable speed recording such as double speed recording is performed, the synchronization setting is important.

Conventionally, when both the source device and the recording device are digital devices such as digital dubbing, a digital I / D interface is installed on the recording device side, the source device is the master, and the recording device side is the slave operation. That is, the synchronization state is maintained by reproducing and operating the self-synchronization clock with respect to the master clock.

FIG. 2 shows a block diagram of a specific configuration example thereof.

A signal from the output terminal of the CD player 200, which is the source device, is supplied to the input terminal of the DAT 300, which is the recording device, via a cable. The DAT300 is a PLL circuit 310 and a data demodulation circuit.
CD player 20 with I / O interface with 320
Regenerate the self-synchronizing clock using the master clock from 0.

The I / O interface reproduces a clock through the operation of the PLL circuit 310 based on the digital signal from the CD player 200 supplied to the input terminal, and outputs the reproduced clock to the data demodulation circuit 320.

The data demodulation circuit 320 demodulates the input digital signal using this reproduced clock. The demodulated data from the data demodulation circuit 320 is supplied to the signal processing circuit 340 via the switch 330, and is subjected to signal processing so as to obtain a signal conforming to the format unique to the DAT device.

The signal thus obtained by the signal processing circuit 340 is output as a recording signal. An analog signal from a microphone or the like is converted into a digital signal by the A / D converter 350 and supplied to the signal processing circuit 340 via the switch 330.
Get DAT format recording signal.

(Problems to be Solved by the Invention) As described above, according to the conventional synchronous recording device, when digital dubbing is performed, the slave device on the recording device side keeps the source device and the recording device in a synchronized state. it can. This synchronized state can be maintained even when variable speed recording such as double speed recording is performed.

However, if the source device is a digital recording / playback type digital recording device such as a disc such as a CD player, and the recording device is an analog recording / playback type rotary recording device such as an analog cassette deck, there is a problem. Occurs. This problem is the same when the relationship between the source device and the recording device is reversed.

That is, in the analog cassette deck, the tape, which is a recording medium, travels by the capstan rotated by the motor, but the tape traveling speed fluctuates due to the fluctuation of the rotation of the motor, which causes speed deviation and wow and flutter.

However, in the conventional method, when the speed fluctuation occurs on the side of the analog recording device, it becomes impossible to maintain the synchronization state between the source device and the recording device, which makes normal recording difficult.

Therefore, the object of the present invention is to provide a variable speed that can maintain the synchronized state when recording is performed using a rotary analog recording / reproducing device and a digital recording / reproducing device even if the speed fluctuations occur on the analog recording / reproducing device side. It is to provide a synchronous recording device.

(Means for Solving the Problems) In order to solve the above-mentioned problems, a variable speed synchronous recording device according to the present invention records a reproduction signal from a digital recording / reproducing device to a rotary analog recording / reproducing device by variable speed synchronous recording. In a variable-speed synchronous recording device, a detection unit that detects rotation speed information of the rotary analog recording / playback device, and a clock that generates a read clock of the digital recording / playback device based on the rotation speed information from the detection unit. Generating means, means for controlling the rotation speed of the digital recording / reproducing apparatus based on the clock from the clock generating means, and a recording medium of the digital recording / reproducing apparatus based on the read clock from the clock generating means. The rotation type analog recording /
Signal processing means for outputting as a recording signal to the playback device.

(Example) Next, this invention is demonstrated, referring drawings.

FIG. 1 is a block diagram showing an embodiment of a variable speed synchronous recording device according to the present invention.

In this embodiment, a signal from a CD player on the source side is recorded on a cassette deck on the recording side.

On the cassette deck 2, the tape 21 is run by a cap stun 22 that is rotated by a motor. The rotation speed (speed) information of the capstan 22 is obtained as a pulse signal by the frequency generator (FG) 23 based on the signal from the motor and is supplied to the PLL circuit 24. Here, in a normal cassette deck, the output from the frequency generator 23 is amplified and fed back to the capstan drive motor to enable the motor to rotate at a constant speed.

The PLL circuit 24 receives the pulse from the frequency generator 23,
Double conversion is performed, and a frequency pulse N times this pulse frequency is output as a read clock on the source device side.

On the other hand, in the CD disc player 1, the disc 11 is rotated by the motor 19. The pickup 12 reads a signal from the rotating disk 11 and outputs it to the RF circuit 13. The RF circuit 13 receives the signal from the pickup 12,
The video / audio signal is supplied to the signal processing circuit 3 and the digital pulse signal is supplied to the PLL circuit 14.

The PLL circuit 14 reproduces a clock from the signal supplied from the RF circuit 13 and supplies it to the phase comparison circuit 15, the speed comparison circuit 16, and further the signal processing circuit 3.

The phase comparison circuit 15 compares the read clock from the PLL circuit 24 with the clock from the PLL circuit 14 and outputs a phase difference signal.

The speed comparison circuit 16 obtains a speed component based on the read clock from the PLL circuit 24 and the clock from the PLL circuit 14, and the speed difference corresponding to both clocks, that is, the drive motor of the capstan 22 and the drive of the disk 11. Motor 19
The difference in the corresponding speed of is output.

The adder 17 adds the outputs from the phase comparison circuit 15 and the speed comparison circuit 16. This added output is amplified by the amplifier 18 and then supplied to the motor 19 as a rotation control signal for the motor 19.

By the above loop processing, the disk rotation speed of the CD player can be made to match the tape traveling speed (capstan rotation speed) of the recording device side.

Here, the phase comparison circuit 15, the speed comparison circuit 16, the adder 17,
The amplifier 18 and the motor 19 constitute a disk servo.

The signal processing circuit 3 has a memory as a time buffer, which stores the signals from the CD player operating in synchronization with the cassette deck as described above, and uses the read clock on the cassette deck side. The signal is read from the memory and used for reproduction. Since it has a memory as this time buffer,
Some deviations in the PLL circuits 14 and 24 are absorbed.

The reproduction signal from the signal processing circuit 3 is converted into an analog signal by the D / A converter 4 and supplied as a recording signal to the recording circuit of the cassette deck.

As described above, in this embodiment, the synchronism of both devices can be maintained only by supplying the output of the frequency generator (FG) 23 corresponding to the tape speed change of the cassette deck to the PLL circuit 24. Further, it is not necessary to consider the rotation accuracy of the digital recording / reproducing device side.

In addition, the rotation control signal of the disk drive motor 19 is
The addition signals of the outputs of the phase comparison circuit 15 and the speed comparison circuit 16 are used for the purpose of further improving the control accuracy.

In the above embodiments, the cassette deck is used as the recording device, but the recording device is not limited to the cassette deck, and any analog recording / playback type rotary device having a detector capable of detecting the number of rotations thereof can be used. Good.

Further, the source device is not limited to the CD player, and may be another digital device such as DAT.

(Effect of Device) As described above, this device is a rotary analog recording /
The signal reproduction clock of the digital recording / playback device is generated based on the rotation speed information of the playback device, and variable speed recording from the source device to the recording device is performed by this generated clock. Even if speed fluctuations and wow and flutter occur, the source device and recording device can always be kept in sync, and high-quality recording is possible even during variable-speed recording.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a variable speed synchronous recording device according to the present invention, and FIG. 2 is a block diagram of a conventional synchronous recording device in digital dubbing. 1 ... CD player, 2 ... cassette deck, 3 ... signal processing circuit, 4 ... D / A converter, 11 ... disk, 12 ...
Pickup, 14,24 ... PLL circuit, 15 ... Phase comparison circuit, 16 ... Speed comparison circuit, 17 ... Adder, 18 ... Amplifier, 19 ... Motor, 21 ... Tape, 22 ... Capstan , 23 …… Frequency generator (FG).

Front page continued (72) Inventor Fumitaka Fujimura 2-17-5 Shibuya, Shibuya-ku, Tokyo Kenwood Co., Ltd. (72) Inventor Kazumasa Otao 2-17-5 Shibuya Shibuya-ku, Tokyo Kenwood (72) ) Inventor Tatsuro Torigoe 2-17-5 Shibuya, Shibuya-ku, Tokyo Kenwood Co., Ltd. (72) Inventor Hideo Ueno 2-17-5 Shibuya Shibuya-ku, Tokyo Kenwood Co., Ltd. (72) Innovator Naito Toshin 2-17-5, Shibuya, Shibuya, Tokyo Kenwood Co., Ltd. (72) Inventor Yasushi Nakayama 2-17-5, Shibuya, Shibuya-ku, Tokyo Shinichi Inoue, Examiner, Kenwood, Kenwood (56) References 56-165934 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A variable speed synchronous recording device for variable speed synchronous recording of a reproduction signal from a digital recording / reproducing device to a rotary analog recording / reproducing device, wherein rotational speed information of the rotary analog recording / reproducing device is detected. Detecting means, clock generating means for generating a read clock of the digital recording / reproducing device based on rotation speed information from the detecting means, and rotation of the digital recording / reproducing device based on the clock from the clock generating means. Control means for controlling the speed, and the rotary analog recording / recording means for subjecting the reproduction signal from the recording medium of the digital recording / reproducing device to predetermined signal processing based on the read clock from the clock generating means.
A variable speed synchronous recording device comprising: a signal processing means for outputting as a recording signal to a reproducing device.