JPS61281776A - Digital picture system - Google Patents

Abstract

PURPOSE:To easily synthesize a video signal by generating a binary signal discriminating an optional section of an external video signal and other section by the binarization and changing over the contents of the external video signal and a picture memory by this binary signal. CONSTITUTION:A signal read from a pickup 2 is outputted to a video signal processing section 7 through a sound signal processing section 4. The processing section 7 stores the digital video signals in a picture memory 8 successively. A synchronizing separator section 11 outputs a synchronous signal separated from an external picture input terminal 10 to the processing section 7. A binary section 12 makes an external video signal binary and outputs it to a picture synthesizing section 9 as a change over signal. The synthesizing section 9 synthesizes the external video signal and the video signal inputted from the processing section 7 based on the change-over signal and outputs to a CRT 13.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention digitizes video signals and audio signals,
The present invention relates to a digital image system that combines a video signal reproduced from a high-density recording disc (referred to as an AID disc) recorded by CM encoding and FM modulation with an external video signal.

(Prior Art) When cutting out an arbitrary part of an image and compositing another video signal with that part, it is conceivable to do this by arbitrarily generating a waveform that determines the part to be cut out.

(Problem to be solved by the invention) However, since the circuit that generates such waveforms is extremely complex, it is difficult to cut out an arbitrary part of an image and synthesize other video signals with that part. Met.

(Purpose of the invention) The present invention was created in view of the above circumstances.

It is an object of the present invention to provide a system that can perform the above-mentioned image synthesis without using a complicated cutout waveform generation circuit.

(Structure of the Invention) The digital image system of the present invention digitizes a video signal and an audio signal, encodes the video signal using PCM, and then modulates the FM to reproduce the recorded high-density recording disk. A system for synthesizing an arbitrary part of a signal, in which the digital video signal demodulated in the device is sequentially written into an image memory, and the arbitrary part of the external video signal is distinguished from other parts by binarization. A binary signal is generated, and the contents of the image memory are switched and inputted to the arbitrary portion of the external video signal based on the binary signal.

(Example) Three embodiments of the present invention will be described below with reference to the drawings.

The drawing is a schematic block diagram of an embodiment of the invention.

Disc placed on turntable 1 (not shown)
The signal read by the pickup 2 is input to the 2 preamplifier section 3, where it is properly amplified and then output to the audio signal processing section 4.

The audio signal processing section 4 performs FM demodulation and digital decoding of the signal input from the preamplifier section 3.

Among the digital signals, the digital audio signal is sent to the D/A (digital/analog) converter 5, the digital video signal is sent to the video signal processor 7, and the control signal is sent to the drive motor 15 of the turntable 1 for phase control. Servo part 1
4 respectively.

The D/A converter 5 performs D/A conversion on the digital audio signal input from the audio signal processor 4 and outputs it to the speaker 6 as an analog audio signal.

The video signal processing section 7 sequentially stores the digital video signals inputted from the audio signal processing section 4 into the image memory 8. Furthermore, the digital video signal stored in the image memory 8 is read based on a synchronization signal inputted from a synchronization separation section 11, which will be described later, and is converted into an analog video signal and outputted to the video synthesis section 9 as an analog video signal.

The image memory 8 has a number of storage areas corresponding to the number of dots constituting the screen of the CRT 13 as a display means, and the digital video signals input from the video signal processing section 7 are sequentially stored in the storage areas. To go.

The synchronization separator 11 separates a horizontal synchronization signal and a vertical synchronization signal from the external video signal input from the external video input terminal 10, and sends the separated synchronization signal to the video signal processing unit 7.
Output to.

The binarization section 12 binarizes the external video signal input from the external video input terminal 10 into "H" level and "L" level, and outputs this to the video synthesis section 9 as a switching signal.

The video synthesis section 9 synthesizes the external video signal input from the external video input terminal 10 and the video signal input from the video signal processing section 7 based on the switching signal input from the binarization section 12. 1. The combined video signal is output to the CRT 13.

For example, by decomposing an external video signal into RGB signals,
By detecting a portion where there is only a signal and inputting this as a switching signal to the video synthesis section 9, it becomes possible to combine only the red portion of the external video signal with the video signal reproduced from the AHD disc.

(Effects of the Invention) The digital image system of the present invention can combine other images with arbitrary parts of nine images without using a complicated cutout waveform generation circuit or the like.

[Brief explanation of drawings]

The drawing is a schematic block diagram showing one embodiment of the digital imaging system of the present invention.

Claims (1)

[Claims] 1) A video signal reproduced by a device that reproduces a high-density recording disk in which the video signal and audio signal are digitized, PCM-encoded, FM-modulated, and recorded is used as an arbitrary part of the external video signal. 2, wherein the digital video signal demodulated in the device is sequentially written into an image memory, and an arbitrary part of the external video signal is distinguished from other parts by binarization.
A digital image system characterized in that a digitized signal is generated, and the contents of the image memory are switched and inputted to the arbitrary portion of the external video signal based on the binarized signal.