JPH04306098A - High definition video recording or reproducing device - Google Patents

Abstract

PURPOSE:To record a high definition video signal in a recording format compat ible with that of a conventional standard color video signal. CONSTITUTION:A high definition video signal is digitized by a 1st A/D converter circuit 1 and stored sequentially in a 1st memory 3. A read address is set synchronously with a synchronizing signal of a 1st NTSC synchronizing signal generating circuit 4 synchronously with a frame synchronizing pulse in the high definition video signal at the read. The signal is read as 2 series of video data whose synchronization period is in common to an NTSC color video signal and processed analogically by 1st and 2nd D/A converter circuits 6, 7 and the result is led out.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-definition video recording apparatus that realizes two-channel recording of high-definition video signals.

0002

[Prior Art] Two high-quality video signals with a frame frequency of 30 Hz and a number of scanning lines per frame of 1125 are
The method for recording distribution to channels has already been established by UNI.
It has been adopted as a standard for high-definition VCRs called HI, and each channel records a high-definition video signal with 537 video lines per frame.

0003

However, in the above-described configuration, the video signal of each channel has a signal format different from that of a normal NTSC color video signal, and the reproduction state cannot be monitored on an NTSC monitor.

0004

SUMMARY OF THE INVENTION Accordingly, the present invention is characterized in that each channel is synchronized with horizontal and vertical synchronizing signals of a standard color television signal when distributing two channels, and a disk servo circuit is also used during reproduction.

[0005]

[Operation] Therefore, according to the present invention, a high-definition video signal is recorded separately into two-channel video signals conforming to the standard color television system, and during playback, both discs are played back by a common disc servo circuit. .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrative embodiments.

First, in FIG. 1, the frame frequency is 30Hz,
1 is a circuit block diagram of a first embodiment in which the present invention is applied to a distribution circuit that distributes a high-quality video signal, each frame of which is composed of 1125 scanning lines, into two channels.

The input high-quality video signal is input to the AD conversion circuit 1, and at the same time, the input high-quality video signal is input to the AD conversion circuit 1.
It is also supplied to the write timing generation circuit 2. This first write timing generation circuit 2 generates a write timing pulse that is synchronized with the synchronization signal of the detected high-definition video signal, and defines the AD conversion timing, write address, and write timing of the high-definition video signal. ing. Therefore, AD conversion data is stored in the first memory 3 according to the write address.

On the other hand, the first NT that inputs the high-quality video signal
The SC synchronization signal generation circuit 4 detects a frame synchronization signal of a high-quality video signal and synchronizes with the frame synchronization signal.
Generates horizontal and vertical synchronization signals for TSC. The first read timing generation circuit 5 to which these synchronization signals are input,
The read address signal synchronized with each synchronization signal is stored in the first memory 3.
is supplied to.

Therefore, the stored data is simultaneously read out for two channels in synchronization with the synchronization signal of the NTSC color video signal. The read data is added with NTSC negative polarity synchronization data and supplied to the corresponding first and second DA conversion circuits 6 and 7, respectively, where it is converted into a two-channel video signal. This video signal is distributed line-sequentially into a field in which odd-numbered lines of the original high-quality video signal are recorded and a field in which even-numbered lines are recorded. The converted video signals are each supplied to two recording circuits (not shown), subjected to FM modulation, and input to two corresponding optical writing devices. Each optical writing device independently forms two recording tracks on the disk surface, and two-channel recording is performed. As a result, two recording tracks are recorded on the front and back sides of the disc, but two tracks are recorded on the same side of the disc.
There is no problem even if it is recorded as a heavy spiral track.

FIG. 2 shows a two-channel signal arrangement. As is clear from this figure, the 1038 effective video lines of the high-quality video signal form 259 lines in the odd field of the A channel, 259 lines in the even field, and 258 lines in the odd field of the B channel, and 259 lines in the even field. A negative synchronization pulse at a level corresponding to the synchronization tip corresponding to the vertical synchronization signal is multiplexed on the first line, the 263rd line, the 264th line, the 265th line, and the 525th line of each frame.

[0012] Each video line is time-division multiplexed with a line-sequential color signal C and a luminance signal Y that have been compressed in the time axis, and the color component of the A channel is PR [=0.6349
(RY)] The color component of the signal or B channel is PB
[=0.5389(B-Y)] signal, and a pilot signal P is multiplexed in front of the compressed color signal C.

[0013] When reproducing the disc recorded in this manner, it is simultaneously reproduced by two optical reproducing devices (not shown) provided at relatively the same position as when recording. The reproduction signal is converted into a reproduction video signal in a reproduction circuit. Each reproduced video signal is supplied to second and third AD conversion circuits 8 and 9, and at the same time, one of the reproduced video signals is supplied to a second NTSC synchronization generation circuit 10 which includes a synchronization separation circuit. The synchronization signal generated by this second NTSC synchronization generation circuit 10 is
The signal is supplied to the second read timing generation circuit 11 and converted into a timing signal. This timing signal defines the AD conversion timing and also defines the write address and write timing of the second memory 12 that stores AD conversion data. The second read timing generation circuit 13 generates a read timing signal in synchronization with the fixed signal. The read timing signal specifies the read timing and read address of the memory, and also specifies the DA conversion timing. Therefore, the read luminance data and color data are input to the third DA conversion circuit 14 and derived as a high-quality video signal.

The feature of this embodiment in the above configuration is that one reproduced video signal is input to the video input terminal of the NTSC monitor receiver 15, and the second NTSC synchronization generating circuit 10 separates the synchronization signal. The point is that the signal is input to the synchronous input terminal of the monitor receiver 15. As a result, a color signal image and a luminance signal image are divided into left and right images on the monitor screen, and the recorded contents can be confirmed using a conventional monitor receiver.

FIG. 4 shows a circuit block diagram of a second embodiment that makes it possible to play back an NTSC signal recording disk by taking advantage of the fact that the recording format of the high-definition video signal of the present invention is almost the same as that of the NTSC signal. It is a diagram. As is clear from this figure, the first pickup 16 and the second pickup 17, which are arranged opposite to each other on both sides of the disc record D driven by the disc motor 19, are the first and second pickups when reproducing a high-quality video signal recording disc. 2 switches S1/S
2 to a decoder 20 for high-definition video reproduction, and is converted into a high-definition video signal. Further, when reproducing a conventional NTSC signal recording disc, the disc motor 19 rotates the disc D in accordance with the reproduction surface side, and transmits the reproduction signal derived via the first or second switch S1/S2.
Third switch S that operates according to the rotation direction of the disc
3 and supplies it to the NTSC reproducing circuit 21.
A C color video signal is formed and derived.

[0016] When playing back a high-definition video signal recording disc,
The fourth switch S4 selects the horizontal synchronization signal obtained from the second NTSC synchronization generation circuit 10 also shown in FIG.
When reproducing a TSC signal recording disc, the fourth switch S4 selects the horizontal synchronization signal obtained from the horizontal synchronization separation circuit 22 in the NTSC reproduction circuit 21. As a result, the disk servo circuit 24 compares the phases of the fixed reference signal generated by the reference oscillator 23 and the selected output of the fourth switch S4, and supplies a servo signal to the disk motor. Therefore, the servo circuit is shared.

Furthermore, in this embodiment, an index signal of a common standard with NTSC is also applied to the high-quality video signal recording disk.
The index latch circuit 18 latches the index data and supplies the data to the control circuit 25 even when reproducing a high-quality video signal recording disk. Therefore, not only the ON/OFF control of the CX circuit and the still control are performed in the same way as when playing back an NTSC signal recording disc, but also the chapter number, playback elapsed time, etc. are displayed on the display means 26.

[0018]

[Effects of the Invention] Therefore, according to the present invention, it is possible not only to monitor the recorded contents before the decoder, but also to monitor the recorded contents before the decoder.
The disk servo circuit and index processing circuit for reproducing the C signal recording disk can also be shared, which is very effective.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a recording circuit of a first embodiment.

FIG. 2 is a waveform explanatory diagram of a recording signal.

FIG. 3 is a block diagram of a reproduction circuit of the first embodiment.

FIG. 4 is a block diagram of a reproducing circuit according to a second embodiment.

[Explanation of symbols]

3 First memory 4 First NTSC synchronization generation circuit 19 Disc motor 24 Disc servo

Claims (2)

[Claims] Claim 1: In a recording device that distributes and records a high-quality video signal into two channels, the vertical synchronization period and horizontal synchronization period of each channel correspond to the vertical synchronization period and horizontal synchronization period of a standard color video signal, respectively. A high-definition video recording device characterized by the following features: 2. A high-definition video recording disk that records a high-definition video signal by distributing it into two channels whose vertical synchronization period and horizontal synchronization period correspond to the vertical synchronization period and horizontal synchronization period of a standard color video signal, respectively. and a standard color video recording disc, characterized in that a disc servo circuit for reproducing the high quality video recording disc and a disc servo circuit for reproducing the standard color video recording disc are also used. A high-definition video playback device.