JPS61127285A - Reproducing device - Google Patents

Abstract

PURPOSE:To synthesize easily two video signals asynchronous with each other surely with simple constitution by receiving a synchronizing signal from a synchronizing signal generating circuit and reading out video signals from the first memory and the second memory synchronously and synthesizing the first and the second video signals read out from memories. CONSTITUTION:Video signal processing circuits 8 and 10 read out stored video signals from picture memories 9 and 19 synchronously with the synchronizing signal and lead them to a video synthesizing circuit 21. The video synthesizing circuit 21 synthesizing digital video signals from the video signal processing circuit 8 and the video signal processing circuits 18, and the synthesized video signal is given to a cathode-ray tube 10 to display a desired picture. Thus, two video signals different from each other which are read from discs 1 and 11 are stored preliminarily in picture memories 9 and 19, and they are synthesized by the video synthesizing circuit 21 synchronously with the synchronizing signal from a synchronizing signal generating circuit 20 which generates the same synchronizing signals as video signals.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a reproducing device, and more specifically, for example 1.
The present invention relates to a device that combines and reproduces a video signal from one video disc with a video signal from another video disc.

BACKGROUND ART Conventionally, for example, when trying to synthesize video signals read individually from two video discs, the synchronization of these two video signals is different, so it is impossible to synthesize them as they are, and one and the same 21 signals and It is necessary to synchronize the color phase.

Therefore, in order to achieve this synchronization with conventional playback devices,
The circuit configuration is complicated, including delay circuits.

Problems to be Solved by the Invention The above-mentioned prior art requires a complicated circuit to synchronize the two video signals, which increases manufacturing costs and increases the size of the aircraft body.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned technical problems and to provide a playback device that has a simple configuration and can easily and reliably synthesize two video signals with different synchronization.

Means for Solving the Problems The present invention provides means for deriving a first video signal, means for deriving a second video signal, a first memory for storing one video signal in the t, and a first memory for storing one video signal in the v.
@2 memory that stores the J2 video signal; a synchronization signal generation circuit that generates a synchronization signal having the same synchronization as the synchronization signal included in the first video signal and the second video signal; and from the synchronization signal generation circuit. receive the synchronization signal of vJ1
A playback device comprising: reading means for synchronously reading video signals from a memory and a second memory; and means for combining the read first video signal and second video signal. be.

According to the present invention, the first video signal from the means for deriving the first video signal is stored in the first memory, and the second video signal from the means for deriving the second video signal is stored in the second memory. , the first memory and the second memory in synchronization with a synchronization signal from a synchronization signal generation circuit that generates a synchronization signal having the same synchronization as the synchronization signal included in the first video signal and the second video signal. The stored first video signal and second video signal are read out and combined by a combining means.

Embodiment The drawing is a block diagram showing the electrical configuration of an embodiment of the reproducing apparatus according to the present invention. The disk 1 is rotationally driven by a motor M1. This motor M1 is phase-controlled by a servo circuit 3 based on a control signal from an audio signal processing circuit 2. This disk 1 is a high-density recording disk (hereinafter referred to as an AHD disk) on which video and audio signals are pulse code modulated and FM modulated signals are recorded.

The recording signal recorded on disk 1 is sent to pickup 4.
This read reproduction signal is given to the preamplifier 5. The preamplifier 5 appropriately amplifies the reproduced signal 116 and outputs it to the audio signal processing circuit 2. This audio signal processing circuit 2 performs FM demodulation and digital decoding on the amplified playback signal, and the combined audio signal is given to a digital-to-analog converter 6, where it is converted into an analog audio signal and output to a speaker 7 for sound production. be done. On the other hand, the audio signal processing circuit 2 supplies a digitally decoded digital video signal to the video signal processing circuit 8 . An image memory 9 is connected to this video signal processing circuit 8, and the digital video signal is stored in the image memory 9.

The image memory 9 has a number of storage areas corresponding to the number of dots constituting the image of the cathode ray tube 10 as a display device, and digital video signals are sequentially stored in these storage areas.

Another video signal is reproduced from the disc 11. This disk 11 is also rotationally driven by a motor M2 in the same manner as the disk 1 described above. A servo circuit 12 is connected to this motor M2, and the phase of the motor M2 is controlled by this servo circuit 12 based on a control signal from an audio/video signal 13. A pickup 14 is arranged above the disk 11, and reads the recording signal recorded on the disk 11.The read reproduction signal is given to a preamplifier 15, where it is appropriately amplified. The reproduced signal is given to the audio signal processing circuit 13. The audio signal processing circuit 13 performs the same operation as the audio signal processing circuit 2 described above, and the decoded audio signal is applied to the digital-to-analog converter 16 to be converted into an analog signal, and this analog audio signal is applied to the speaker 17. It is made into sound. The audio signal processing circuit 13 also provides a digitally decoded digital video signal to another audio/video signal processing circuit 18 . This Eirin signal processing circuit 1
An image memory 19 is connected to 8, and a digital video signal is stored in this image memory 19. Like the image memory 9 described above, the picture memory 19 has a storage area corresponding to the number of dots forming the image of the cathode ray tube 10, and digital video signals are sequentially stored in this storage area.

The video signal processing circuits 8 and 18 include a synchronization signal generation circuit 20.
is connected to generate a synchronization signal having the same synchronization as the synchronization signal contained in the video signal from disk 1 and the video signal from disk 11. The synchronizing signal derived from the synchronizing signal generating circuit 20 is given to the video signal processing circuits 8 and 18, respectively.
The stored video signal is read out from 9 and output 7 to the video synthesis circuit 21. In the video synthesis circuit 21,
Video signal processing circuit 8 and another video signal processing circuit 18
The synthesized video signal is applied to the cathode ray tube 10 to display a desired image.

In this way, two different video signals read from disk 1 and disk 11 are stored in advance in image memo IJ9, 1.
9 and synthesized by the video synthesis circuit 21 in synchronization with the synchronization signal from the synchronization signal generation circuit 20 that generates the same synchronization signal as the synchronization signal included in this video signal, so that it is similar to the conventional method. This makes it possible to easily synthesize two video signals with different synchronization with a simple configuration without requiring any complicated circuitry.

As another embodiment of the present invention, for example, an external processing system may be connected that controls which of the video signals from the disc 1 and the video signals from the disc 11 should be prioritized.

Effects As described above, according to the present invention, it is possible to easily and reliably synthesize two video signals with different synchronization using a simple configuration.

[Brief explanation of the drawing]

The drawing is a block diagram showing the electrical configuration of an embodiment of the reproducing device according to the present invention.

Claims (1)

[Scope of Claims] Means for deriving a first video signal; means for deriving a second video signal; a first memory for storing the first video signal;
a second memory that stores a video signal; a synchronization signal generation circuit that generates a synchronization signal having the same synchronization as a synchronization signal included in the first video signal and the second video signal; a readout unit for receiving a synchronization signal and synchronously reading out video signals from the first memory and the second memory; and a unit for combining the read out first video signal and second video signal. A playback device characterized by: