JP2663633B2 - Dubbing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dubbing apparatus used for an optical disk recorder or other disc-shaped medium recording apparatus for recording a write-once and erasable digital signal.

2. Description of the Related Art FIG. 4 shows an example of a recordable optical disk. As shown in FIG. 4, address signals having information such as track numbers are recorded in advance on the optical disc, for example, at two locations on a diagonal line. By reproducing the address signal on the disk, the recording / reproducing positions of the two optical disk recording / reproducing devices can be controlled, and the synchronous operation can be performed.

Generally, when a digital signal is recorded on an optical disk as described above, recording is performed as shown in FIG. FIG. 5A shows an address signal recorded in advance on the disc, and FIG. 5B shows a signal to be recorded on the disc in an overlapping manner. As shown in FIG. 5, in the section of the address signal recorded in advance every 1/2 rotation, a signal (for example, 6.67 MHz) which is a single frequency called the amble signal and which is largely separated from the address signal is recorded. In sections other than the address signal, digital data is recorded in several sectors (for example, 12 sectors per rotation).

As shown in the block diagram of FIG. 3, the digital dubbing method generally performed in the past does not transmit the digital signal itself recorded on the disk to the optical disk recording device 8 of the dubbing destination, but the digital dubbing source. The digital data read by the pickup means 2 from the disk 1 of the optical disk reproducing device 4 is input to the decoder 3 to correct errors caused by dust and scratches on the disk, and to copy data without errors to the dubbing destination. To the encoder 5 of the optical disk recording device 8. In the encoder 5, signals such as an error correction code, an address, a synchronization signal and the like are added, and the data is modulated to serial data and sent to the laser drive circuit 6 for recording on a disk. The laser drive circuit 6 drives the laser according to the input signal, and performs dubbing by writing the signal to the optical disk.

However, in the above-described conventional configuration, a dubbing source optical disc reproducing device requires a decoder circuit, and a dubbing destination optical disc recording device requires an encoder. Encoder and decoder demodulate data,
It is composed of expensive circuits that perform complicated operations such as error correction and addition of synchronization signals, addition of address signals, and addition of correction codes. Not only does the dubbing device itself become very complicated, but also decoding, error correction, and encoding are performed. In this case, since data is input to and output from the memory, a large time delay occurs, and the delay synchronization operation of the dubbing destination optical disc reproducing device and the dubbing destination optical disc recording device becomes very complicated.

The present invention has been made in view of the above problems, and has as its object to provide a dubbing apparatus that can perform dubbing with a very simple circuit configuration.

Means for Solving the Problems In order to solve the above problems, the dubbing apparatus of the present invention uses information recorded in advance on a disc, such as an address signal, from a signal recorded on the disc by using a high-pass filter or the like. It is configured to separate and selectively output the section of the address signal and output it, input to the laser drive circuit of the dubbing destination optical disc recording device, and perform dubbing recording on the optical disc.

According to the present invention, the signal read out by the dubbing source optical disc reproducing device is frequency-separated by a high frequency band filter or the like, and the address signal is selectively switched to remove the address signal. The signal is transmitted to the optical disk recording device. The time delay of the signal at this time is several hundred n
Since the time is about sec, the synchronous operation of the optical disc reproducing device of the dubbing source and the optical disc recording device of the dubbing destination can be performed with simple control by using the same rotation reference signal.

FIG. 1 is a block diagram showing an embodiment of a dubbing apparatus according to the present invention.

In FIG. 1, the dubbing source optical disc reproducing device 4
The signal recorded on the disk 1 read out from the optical disk 1 by the optical pickup means 2 is a high-frequency wave
As a result, the address signal component (several hundreds of kHz to 1 MHz) is sufficiently removed. Further, the delay unit 10 gives the same amount of delay as the delay time of the high-band wave unit 11. These signals are input to the respective input terminals of the switch 12.

Further, an address signal section of the reproduced signal is detected by the address signal detector 9 and input to the control terminal of the switch 12, and the output of the high-frequency wave filter 11 is output in the address signal section. Are selected and output.

FIG. 2A shows the output signal of the pickup means 2, that is, the signal obtained by superimposing the address signal and the amble signal taken out from the disk, and FIG. 2B shows the signal from which the address signal has been removed by the high-pass filter 11. In the case of b, noise is partially mixed in at the rise and fall of the address signal, but this level is not a problem with respect to the stability of the clock reproduction as the purpose of the amble signal.

The signal from which the address signal has been removed in this manner is transmitted to the laser drive circuit of the optical disk recording device 8 at the dubbing destination and recorded on the optical disk. In this case, in processing the signal taken out by the pickup means 2 of the dubbing source optical disc reproducing device 4 and transmitting the processed signal to the laser drive circuit of the dubbing destination optical disc recording device 8, the time delay is almost the same as that of the high band wave device. It is given only by the transmission delay, and the delay time is also about several 100 nsec to 1 μsec. Therefore,
The two optical disk recording / reproducing devices need only be operated synchronously with the same rotation reference signal.

Effect of the Invention As described above, according to the present invention, by replacing only the address signal section with the signal removed by the high-pass filter,
Dubbing recording of an optical disk can be performed with a very simple circuit configuration, and synchronous operation of two optical disk recording / reproducing devices can be performed by tracing the same address with the same rotation reference signal. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram of a dubbing apparatus according to an embodiment of the present invention, FIG. 2 is a waveform diagram of each part in FIG. 1, FIG. 3 is a block diagram of a conventional dubbing apparatus, and FIG. FIG. 5 is a plan view showing the relationship between the address signal of the optical disk and the digital data to be recorded. 1 ... Disc 4 ... Dubbing source optical disc playback device 8 ... Dubbing destination optical disc recording device 9 ... Address signal detector 10 ... Delay device 11 ... High band wave device 12 ...
Switch.

Claims (1)

(57) [Claims] A digital signal is recorded on a disk-shaped recording medium on which an address signal indicating a position of a guide groove or the like is recorded in advance, and a synchronous operation is performed while reproducing the recorded disk by a first recording / reproducing apparatus. In the apparatus for dubbing recording by the recording / reproducing apparatus of No. 2, the reproduced original signal read out from the optical pickup of the first recording / reproducing apparatus is inputted to the high-frequency wave filter, and only the section where the address signal is recorded is reproduced. And a dubbing device for selectively switching and outputting, and inputting the laser driving circuit of the second recording / reproducing device to record on a disk.