JPH0533598B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention reproduces digital information recording disks (hereinafter referred to as disks) in which 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 demodulates a signal read from a disk using a pickup to obtain a digital signal train, and then performs predetermined processing such as error detection and error correction on this digital signal. The block-by-block digital signal to be converted into a video signal and an audio signal is obtained. Among these digital signals, digital video signals were stored in an image memory, read out sequentially, converted into digital/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 converts an analog video signal input from outside the device into a digital video signal, and also stores the converted digital video signal within the device. an external input writing means for writing into the image memory provided in the apparatus by a writing method similar to the image memory writing means provided in the apparatus; and the digital information in which a control signal for controlling the external input writing means is recorded. The digital information recording disk includes a recording disk and external input writing control data processing means for controlling writing by the external input writing means based on a control signal recorded on the digital information recording disk during reproduction.

(Function) The external input writing means converts an analog video signal input from outside the device into a digital video signal, and the converted digital video signal is stored in the same way as the image memory writing means provided within the device. The image is written into the image memory provided in the device using the writing method.

At this time, the external input writing control data processing means sequentially reads and processes the control signals recorded on the digital information recording disk, and controls the external input writing means based on the processed control signals.

This makes it possible, for example, to zoom in and display a video signal input from the outside, or to automatically switch at various timings.

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

It is assumed that a control signal for controlling a writing operation of an external input writing section 12, which will be described later, is recorded in advance on a disk (not shown) placed on the turntable 1.

The signal read from this disk by the pickup 2 is input to the preamplifier section 3, where it is properly amplified and then output to the tracking servo section 4, time base servo section 5, and FM demodulation section 6. Ru.

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

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 includes the FM demodulation section 6
Performs predetermined error detection and error correction on the input digital signal string, and converts the block-based digital signal into a video signal and audio signal, and the digital signal indicating the control signal to be sequentially reproduced from the disk. After obtaining this digital signal, it outputs this digital signal to the audio signal processing section 8, the image memory writing section 9, and the external input writing control data processing section 20.

The audio signal processing section 8 performs digital-to-analog conversion of the digital audio signal included in the digital signal input from the error detection/error correction section 7, and outputs the converted audio signal to an audio output terminal 10, as an analog audio signal.
Output to 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 write control data processing section 2
0 separates the digital signal (control signal recorded on the disk) output from the error detection/error correction section 7, and controls the external input writing section 12 based on this control signal.

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 a digital video signal based on the signal input from the external input writing control data processing section 20. Write to image memory 11.

For example, a digital video signal is written into the image memory 11 using the same writing method as that performed by the image memory writing section 9 described above. That is, the position on the screen and the address position on the memory are written in correspondence. This allows video data input from the outside to be played back in the same way as video data on a disc.

Further, under control from the external input write control data processing section 20, it is possible to zoom in and display video data input from the outside, or to automatically switch at various timings, for example.

The video signal processing unit 14 reads out the storage contents of 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 an analog video signal. It is output to the video terminal 15 as a video signal.

The control section 16 appropriately controls the pickup 2, tracking servo section 4, time base servo section 5, audio signal processing section 8, video signal processing section 14, operation key/display section 17, and main motor servo section 18. The main motor servo section 18 controls the rotation of the turntable 1. Further, the power supply circuit 19 supplies power to each of the above sections.

(Effects of the Invention) The digital information recording disk reproducing device of the present invention processes video data input from outside the device using external input writing control data processing that operates based on control signals pre-recorded on the digital information recording disk. Since it is configured so that it can be controlled by means and written to the image memory provided in the device, it is possible to zoom in and display image data input from the outside, or to output it by automatically switching at various timings. This can be realized with a simple circuit configuration, and the playback of digital information recording disks can be enjoyed more than ever before.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing an embodiment of a digital information recording disk reproducing apparatus according to the present invention. 9... Image memory writing unit, 11... Image memory, 12... External input writing unit, 20... External input writing control data processing unit.

Claims (1)

[Scope of Claims] 1. In a device for playing back a digital information recording disk 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 device is converted into a digital video signal. external input writing means for converting the digital video signal into a signal and writing the converted digital video signal into an image memory provided in the device using a writing method similar to the image memory writing means provided in the device; the digital information recording disk on which a control signal for controlling the external input writing means is recorded; and during reproduction, the writing of the external input writing means is controlled based on the control signal recorded on the digital information recording disk; 1. A digital information recording disk reproducing device comprising external input writing control data processing means.