JPS6190366A - Video disc player - Google Patents

Abstract

PURPOSE:To reproduce a high quality picture or sound by storing digitalized outside picture signals or sound signals to an memory circuit and combining them digitally with picture signal or sound reproducing signal of the player itself, and outputting them. CONSTITUTION:The outside sound signal is inputted from a terminal 15, converted onto digital signal by an outside input signal processing circuit 16 and stored to the memory circuit 17. The sound signal is taken in to an adding circuit 18 at the different timing from the timing of storing commanded by a control part 8, and digitally combined with the reproduction digital sound signal of the player itself. Its output signal is converted into an analogue signal by AHD sound processing circuit 13 and outputted from a terminal 13. Since it is combined as the digital signal, the reproduction signal having high sound quality is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a video disc player, and more specifically, to a video disc player, and more particularly, to a video disc player, the video signal and audio signal are digitized, converted into a PCM signal, and then FM-modulated and recorded from an AHD system disc. The present invention relates to a video disc player which is configured to be able to play back audio signals, and which has a completely new function that has not existed in the past.

(Prior Art) In this type of video disc player, when reproducing video and audio signals from an AHD disc, error detection and It is configured to perform digital processing such as error correction to obtain a block-based digital signal to be converted into a video signal and an audio signal, perform digital/analog conversion on the block digital signal, and output it.

By the way, analog video or audio signals output from devices other than this video display player are input to this player, and the external video or audio signals are input to the video or audio output signal of the player itself (i.e., the AHD). It is conceivable that the external video or audio signal and the video or audio output of the player itself may be output simultaneously. Generally, a method is adopted in which the signals are combined (added) and output at the analog signal stage.

However, when using such means, it is necessary to perform complicated applied processing such as adding together the video or audio signal input from another device and the video or audio signal of the player itself, for example, with a temporal shift. It is very difficult to do so, and it also has the disadvantage that the image quality or sound quality tends to deteriorate and is unreliable.

(Object of the invention) The present invention has been made in view of the above circumstances, and
The purpose of this is to perform complex applied processing such as adding video or audio signals input from other devices and the video or audio signals of the player itself, with a temporal shift, to achieve superior image or sound quality. It is an object of the present invention to provide a highly reliable video disc player that can be easily operated while guaranteeing the following.

(Structure of the Invention) In order to achieve the above object, a video disc player according to the present invention has the basic structure described at the beginning, and converts a video or audio analog signal input from an external input terminal into a digital signal. A circuit for processing the external video or audio signal converted into a digital signal is provided, and a circuit for storing the external video or audio signal converted into a digital signal is provided. The device is characterized in that it is provided with an adder circuit capable of synthesizing and outputting a signal and an external video or audio signal converted from the digital signal outputted from the storage circuit.

(Embodiments) Hereinafter, specific embodiments of the video disc player according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the overall schematic circuit configuration of a video disc player according to a first embodiment, and 1 is a block diagram showing a video signal and an audio signal that are digitized and converted into PCM signals, then FM-modulated and recorded. A certain AHD type disc D
A main servo motor circuit rotates the (high-density recording disk) at a constant speed; 2 is a pickup section that detects an FM recording signal from the disk D; 3 is a pickup section that amplifies the output of the pickup section 2 to a predetermined level; Preamplifier 4 is
An FM demodulation circuit 5 demodulates the output of the preamplifier 3 and converts it into a digital signal; 5 is a correction circuit 6 that performs digital processing such as predetermined error detection and error correction on the output of the FM demodulation circuit 4; is a tracking servo circuit, 7
8 is a time base servo circuit; 8 is a control unit including a control microcomputer that controls the pickup unit 2, main servo motor circuit 1, etc. in response to operations on the operating unit 9; 10 is a power source for the video disc player. .

Reference numeral 11 denotes an AHD video signal processing circuit that processes the digital video signal input from the correction circuit 5 and outputs it to the reproduced video signal output terminal 12.

Further, 13 basically processes the digital audio signal output from the correction circuit 5 and reproduces the audio signal output terminal 1.
4.14 is an AID audio signal processing circuit that outputs an analog signal, and a circuit group configured as follows is interposed between the correction circuit 5 and the AHD audio signal processing circuit 13.

That is, this video disc player has external input terminals 15 and 15 for inputting analog audio signals from other devices.
The external analog audio signal input from the external input terminal 15.15 is sent to the external input signal processing circuit 1.
After being converted into a digital signal in step 6, it is stored in the storage circuit 17. The external digital audio signal stored in the storage circuit 17 is read into the digital addition circuit 1B at a timing different from the timing at which the external digital audio signal was stored in the storage circuit 17 according to a command from the control section 8.
In the digital addition circuit 18, it is added to the reproduced digital audio signal of the video disc player itself outputted from the correction circuit 5 and synthesized. Then, the synthesized digital audio signal outputted from the adder circuit 1B is processed by the AID audio signal processing circuit 13 and returned to an analog signal, and then sent to the reproduced audio signal output terminal 14.
It is output from.

According to this configuration, for example, when the AHD disc D is not played, the playback audio signal output terminal 14
．． From 14 onwards, only the external audio signal input from the external input terminal 15.15a is outputted with a temporal shift from the time of input, and by connecting this to an external amplifier etc. This enables convenient usage such as the ability to easily configure an echo generator.

FIG. 2 is a block diagram showing an overall schematic circuit configuration of a video disc player according to a second embodiment, and the one according to the first embodiment can process external analog audio signals input from other devices. While it is composed of
The video disc player according to the second embodiment is configured to be able to process external analog video signals input from other devices.

Therefore, in this video disc player, the digital audio signal output from the correction circuit 5 is directly input to the AHD audio signal processing circuit 13, where it is processed, and output as an analog signal from the reproduced audio signal output terminal 14.14.

On the other hand, an external input terminal 15 is provided for inputting an analog video signal from another device.
The external analog video signal input from the external input signal processing circuit 16 is converted into a digital signal and then stored in the storage circuit 17, and the external digital audio signal stored in the storage circuit 17 is processed by the control unit. 8 is called into the digital addition circuit 1B at a timing different from the timing stored in the storage circuit 17, and in the digital addition circuit 18, the correction circuit 5
The signal is added to the reproduced digital video signal of the video disc player itself outputted from the video disc player and synthesized. The composite digital video signal outputted from the adder circuit 1B is processed by the AH, D video signal processing circuit 13, converted back to an analog signal, and outputted from the reproduced video signal output terminal 12.

The rest of the configuration is the same as that of the first embodiment, so the explanation thereof will be omitted.

Note that in each of the above embodiments, a video disc player configured to be able to process only either an external analog audio signal or an external analog video signal input from another device has been shown, but both embodiments may be combined. In particular, it may be configured to be able to process both an external analog audio signal and an external analog video signal.

(Effects of the Invention) As is clear from the above detailed description, the video disc player according to the present invention is configured to be capable of inputting video or audio analog signals from an external device and converting them into digital synthesis. The external video or audio signal converted into a digital signal and the video or audio signal played back by the video disc player itself in the digital signal stage demodulated from the FM signal picked up from the AHD disc can be digitalized at any timing. Because it is configured so that it can be synthesized and output, it is highly reliable and can provide extremely excellent output without deteriorating image or sound quality, compared to systems that perform synthesis after converting to analog signals. In addition to this, it is also possible to easily perform convenient applications such as configuring an echo generator.

[Brief explanation of the drawing]

The drawings show an embodiment of a video disc player according to the present invention, with FIG. 1 being an overall schematic circuit block diagram of the first embodiment, and FIG. 2 being an overall schematic circuit block diagram of the second embodiment. D...AHD system disc, 15...external input terminal,
16...External input signal processing circuit, 17...Memory circuit, 1
B...Digital addition circuit. Applicant: Sharp Corporation Agent: Kazuhide Okada, Patent Attorney

Claims (1)

[Claims] (1) In a video disc player that is configured to be able to play back video and audio signals from an AHD disc that has been recorded by digitizing and converting the video and audio signals into PCM signals, the external input terminal A circuit for converting an input video or audio analog signal into a digital signal and a circuit for storing the external video or audio signal converted into the digital signal are provided, and a circuit for converting the input video or audio analog signal into a digital signal is provided. An adder circuit is provided that can synthesize and output the digital signal of the demodulated video signal or audio signal and the external video or audio signal converted into the digital signal output from the storage circuit. A video disc player characterized by: