JPH0264961A - Video signal generator for optical discs - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a video signal generator for an optical disc for recording signals on an optical disc such as a video disc or a still image file.

Conventional technology In general, optical discs are considered promising as information media due to their extremely high information density, high S/N ratio, and low noise, and are commercialized as video discs and still image files, which record digital signals. In recent years, research and development has been carried out as an optical disc for playback.

Hereinafter, an example of the above-mentioned conventional video signal generation device for an optical disc will be described with reference to the drawings. FIGS. 2 and 3 are block diagrams of a conventional optical disc video signal generator for recording signals on a video disc, which is a general optical disc. Further, FIG. 4 shows an outline of a video signal, that is, a video signal. The following table shows a list of code signals.

Code Signal List In Figures 2 and 3, 1 is a video tape recorder (VTR) for playback, 2 is a code signal generator, 3 is a recording VTR, 14 is a playback VTR, s is an FM modulator, and 6 is a It shows a digital conversion device. A code signal is a code signal that is initially inserted into a video signal to display a frame number or elapsed time on the screen when playing an optical disc, to automatically play a still image on a specific screen, or to locate a screen. 16.1 in the vertical retrace interval of the television video signal as shown in Figure 4.
A signal composed of a 24-bit pulse code as shown in Figure $5 is inserted into each of the 7.18th and 279th, 280.281st horizontal scanning lines. FIG. 2 shows a method for inserting this code signal. This involves inserting a code into the video signal played back from a video tape recorder (VTR) 1 by manually switching the code signal generator 2 while viewing the content on the monitor screen. V for recording again
Recorded in TR3. When using this video signal on an optical disc, as shown in FIG. 3, the video signal previously inserted with the code signal and recorded on the VTR 3 is played back on the playback VTR 4, FM modulated using the FM modulation device 6, and then transferred to the digital conversion device. 6, the signal is converted into a digital signal and recorded on an optical disc.

Problems to be Solved by the Invention However, with the above configuration, in order to insert the code signal, it is necessary to record the code signal onto the tape once using a VTR, that is, to dub it, resulting in deterioration of the quality of the video signal and the need for processing. It also requires a lot of time. Moreover, the manual operation of the code signal generator makes it easy for errors to occur.

In view of the above-mentioned problems, the present invention provides a video signal generator for optical discs that can generate optical discs with higher precision and higher quality.

Means for Solving the Problems In order to solve the above problems, the video signal generator for optical discs of the present invention sets code insertion or switching time information before recording signals on the optical disc. When recording a signal, the time code value read from the VTR is automatically compared with the initially set value, and the code content of the code signal generator is automatically switched at the matched time. It was designed so that

Function: With the above-described configuration, the present invention can automatically insert a code into the video signal reproduced from the fiVTR or switch the code content according to the initially set time information.
There is no need to dub the video signal to another tape, so there is no deterioration in the quality of the video signal. Also, since everything is done automatically, code insertion or switching can be done without mistakes.

Embodiment Hereinafter, a video signal generator for an optical disc according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a video signal generator for an optical disc in a first embodiment of the present invention. In Figure 1,
11 is a video tape recorder for playback (VT, R); 12
is a code signal generator, t3 is a time code reading device, 14 is a time code comparison device, 15 is a drive device, 16 is an FM modulation device, 17
indicates a digital conversion device.

On a VTR tape, a video signal is recorded on a video track, and time information, ie, a time code signal, indicating the position of the VTR tape is recorded on an audio track. Before recording a video signal on an optical disk, first input the switching time of the code to be inserted into the video signal into the time code comparator 14 in a time corresponding to the time code on the tape, and also input the contents of the code to be inserted at the same time. I'll keep it. To record a video signal on an optical disc, first move the vTRll to simultaneously reproduce the video signal and time code signal. The reproduced time code signal is read by the time code reading device 13 (that is, the signal is converted into a digital signal, and from this digital signal, the content of the frame at 2 minutes 9 seconds is decoded), and the time code comparison device 14 is used to read the first set. The time and the read time code value are compared, and when they match, the drive device 16 switches the code content of the code signal generator 12 according to the code content initially set in the time code comparison device 14. The video signal reproduced by the VTR 11 is sent to the code signal generator 12 as described above.
A code signal is automatically inserted, modulated by an FM modulator 16, converted into a digital signal by a digital converter 17, and recorded on an optical disc.

Effects of the Invention As described above, the present invention can automatically insert a code signal into the video signal when recording the video signal on an optical disc, so it can be recorded without deteriorating the image quality of the video signal, and the content of the inserted code can be changed. can be changed freely.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a video signal generator for an optical disc in an embodiment of the cylinder 1 of the present invention, FIGS. 2 and 3 are block diagrams of a conventional video signal generator for an optical disc, and FIG. It is a waveform diagram of a signal. 11...Video tape recorder (VTR), 1
2... Code signal generation device, 13... Time code reading device, 14... Time code comparison device, 16-... Drive device, 1e...・・・
- FM modulation device, 17...digital conversion device. Name of agent: Patent attorney Shigetaka Awano and 1 other person11
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'Separate 14--1 Time code ratio 1U section 15--Then the 3rd FM degree [F7--- Figure 2 of the digital friend decision device! --- High-off record code 9 --- Video scanning coater diagram

Claims (1)

[Claims] (1) A video tape recorder for reproducing recorded signals, a code signal generating device for adding a code signal to the video signal, that is, a video signal, reproduced from the video tape recorder, and reproduction from the video tape recorder. a time code reading device for reading the time code signal read by the time code reading device; a time code comparison device for comparing the value of the time code signal read by the time code reading device with an initially set value; A driving device for switching the code content of the code signal generator at a time that matches with the time code comparison device, an FM modulator for FM modulating the video signal added with the code by the code signal generator, and the FM modulator. 1. A video signal generation device for an optical disc, comprising: a digital conversion device for converting an FM modulated signal into a digital signal.