JPS61260465A - Reproducing device for digital information recording disc - Google Patents

Abstract

PURPOSE:To reproduce even video data inputted from the external by providing an external input writing means which writes a digital video signal in a picture memory in the same writing method as a picture memory writing means in a device. CONSTITUTION:A picture memory writing part 9 separates the digital video signal from the digital signal inputted from an error detecting and correcting part 7 and writes it in a picture memory 11. An external input writing part 12 converts the analog video signal inputted from an external input terminal 13 to a digital video signal and writes it in the picture memory in the same method as the picture memory writing part 9. That is, the signal is written while allowing a position on the screen and that of an address of the memory to correspond to each other. A video signal processing part 14 reads out stored contents of the picture memory 11, namely, video data of a disc or video data inputted from the external and subjects read video data to D/A conversion and outputs video data to a video terminal 15 as an analog video signal. Thus, video data other than video data recorded on the disc is reproduced.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention reproduces a digital information recording disk (hereinafter referred to as a disk) in which 3 analog video signals and analog audio signals are digitized, encoded, and then FM modulated and recorded. The present invention relates to a digital information recording disk reproducing device.

(Prior Art) A conventional playback device of this type performs FM demodulation of a signal read from a disk in pink-up mode to obtain a digital signal train, and then performs predetermined error detection, error correction, etc. processing on this digital signal. is performed to obtain block-by-block digital signals to be converted into video and audio signals. Among these digital signals, digital video signals were stored in an image memory, read out sequentially, converted from digital to analog, and output.

(Problems to be Solved by the Invention) As mentioned above, conventional digital information recording disk playback devices can only play back video data recorded on the disk, and during playback, other than the video data on the disk can be played back. It was impossible to play back the video data.

(Means for Solving the Problems) The digital information recording disk reproducing device of the present invention includes an analog-to-digital conversion means for converting an analog video signal input from outside the device into a digital video signal, and
Equipped with external input writing means for writing the digital video signal converted by the digital conversion means into the image memory provided within the device using a writing method similar to the image memory writing means provided within the device. It is.

(Function) The analog video signal input from outside the device is converted into a digital video signal by the analog-to-digital conversion means,
A digital video signal is written by the external input writing means into the image memory provided within the apparatus using a writing method similar to that of the image memory writing means provided within the apparatus.

Due to this.

Video data input from the outside can be played back in the same way as video data on a disc.

(Example 1) This embodiment is shown in FIG.

FIG. 1 is a schematic block diagram of a digital information recording disk reproducing apparatus according to the present invention.

Disc placed on turntable 1 (not shown)
The signal read by the pickup 2 is input to the preamplifier section 3, where it is appropriately amplified, and then sent to the tracking servo section 4. Time base servo section 5. and is output to the FM demodulator 6.

The tracking servo unit 4 separates the signal necessary for tracking control from the signal input from the preamplifier unit 3, detects the deviation of a sensor (not shown) on the disk from the track center based on this signal, and detects the deviation of the sensor (not shown) from the track center. controls pickup 2 so that it traces the trunk center correctly.

The time base servo section 5 corrects jitter based on the signal input from the preamplifier section 3, and controls the pickup 2 appropriately.

The FM demodulation section 6 performs FM demodulation on the signal input from the preamplifier section 3 to restore it to a digital signal string, and outputs this signal string to the error detection/error correction section 7.

The error detection/error correction section 7 performs predetermined error detection and error correction on the digital signal string inputted from the FM demodulation section 6, and converts the digital signal in blocks to be converted into a video signal and an audio signal. After obtaining this digital signal, it is outputted to the audio signal processing section 8 and the image memory writing section 9.

The audio signal processing section 8 includes the error detection/error correction section 7.
The digital audio signal contained in the input digital signal is digital-to-analog converted and output as an analog audio signal to an audio output terminal 10°10.

The image memory writing section 9 separates a digital video signal from the digital signal input from the error detection/error correction section 7 and writes it into the image memory 11.

The external input writing section 12 converts the analog video signal input from the external input terminal 13 into a digital video signal, and converts this digital video signal into the above-mentioned data using the same writing method as that performed by the image memory writing section 9. Write to image memory 11. That is, the position on the screen and the address position on the memory are written in correspondence.

The video signal processing unit 14 reads out the content stored in the image memory 11, that is, the video data on the disk or the video data input from the outside, and converts the read video data (digital video signal) from digital to analog to convert it into analog video. It is output to the video terminal 15 as a signal.

The control unit 16 controls the pickup 2. Tracking servo section 4. Time base servo section 5. Audio signal processing section 8. Video signal processing section 14. Operation keys/display section 17. and a main motor servo section 18, respectively, and the main motor servo section 18 controls the rotation of the turntable l. In addition, the power supply circuit 19
supplies power to each of the above parts.

(Example 2) This embodiment is shown in FIG.

Note that blocks that are the same as those described in the first embodiment are given the same reference numerals.

In this embodiment, control signals for controlling the external input writing unit 12 described in the first embodiment are recorded on the disk in advance, and during playback, these control signals are processed one after another, and the external input writing is performed accordingly. By controlling the input unit 12, for example, video data input from the outside can be zoomed up and displayed, or automatically switched at various timings.

In the figure, 20 is an external input write control data processing unit that separates the control signal recorded on the disk from the digital signal output from the error detection/error correction unit 7, and based on this control signal, inputs the external input. Writing section 1
Control 2.

The external input writing section 12 converts the analog video signal input from the external input terminal 13 into a digital video signal, and converts the digital video signal into a digital video signal based on the signal input from the external input writing control data processing section 20. Image memory 1
Write to 1.

Note that the other configurations are the same as in the first embodiment.

(Effects of the Invention) The digital information recording disc playback device of the present invention can play back video data other than the video data recorded on the disc, making it possible to enjoy playing back digital information recording discs more than ever before. can.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram showing a first embodiment of a digital information recording disk reproducing apparatus of the present invention, and FIG. 2 is a schematic block diagram showing a second embodiment. 9... Image memory writing section 11... Image memory 12... External input writing section

Claims (1)

[Claims] 1) In an apparatus for playing back a digital information recording disc recorded by digitizing and encoding an analog video signal and an analog audio signal, and then performing FM modulation, the analog video signal input from outside the apparatus is digitized. An analog-to-digital conversion means for converting into a video signal, and an image memory writing means provided in the apparatus for writing the digital video signal converted by the analog-to-digital conversion means in the same manner as the image memory writing means provided in the apparatus. 1. A digital information recording disk reproducing device comprising an external input writing means for writing into an image memory.