JPS58196795A - Recording and reproducing system - Google Patents

Abstract

PURPOSE:To improve S/N by recording a synchronizing signal part at least in color television signals with a different signaling system from other part to realize a frequency modulation of the video signal in the upper part of a pedestal part. CONSTITUTION:A color video signal is supplied to a video input terminal V, and an audio signal is supplied to an audio input terminal A. The audio signal is inputted to a pulse generator 10, and the output of it is inputted to a control circuit 16. The output of an RAM15 is converted to a data train, which is headed by a signal having a specific pulse train called the SYNC bit and coded by a coding circuit 17. The outputs of the circuit 17 and a limiter 9 are inputted to a light modulator 18 via a switch S1, and a signal is recorded on a disk 19 with a laser beam.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording/reproducing method for a video disc, and particularly to recording an audio signal as a digital signal together with a video signal! Regarding the recording method.

Conventionally, in the case of video discs, the video signal is transmitted on the same wave as the audio signal, and the respective @ signs are added or the duty cycle is set as follows.
This method is used to record on discs.

By the way, when an audio signal is recorded on a disk with a chest wave number t-, the carrier is lost due to the disk dripping or blowing out, resulting in so-called "buzzing" noise, which is a problem that improves the sound quality of playback. Furthermore, due to the beat interference between the spectrum of the rS signal whose wave number has been changed by the video signal and the signal which has been changed by the audio signal, even one endogenous component could not be added sufficiently.

In view of the above points, the present invention aims to provide a recording and reproducing method that can greatly improve the endogenous sound quality and the natural sound quality.

That is, the invention of the present invention provides at least one period signal portion of the color television tSS with a specific digital 0!
The signal is recorded on the distribution medium and played back using a signal system different from that used in the auxiliary signal section, and the video signal can be recorded in the same wave over the pedestal section, so the playback video signal is SIN can be improved.

The invention of aspect 2 of the present application converts at least the first period signal portion of a color television signal into a specific digital signal that is shorter in time than the synchronization signal portion, and also converts the audio signal into a digital signal @6ζ. The color television signal other than the synchronization signal part is transmitted to the synchronization signal part along with the digital signal that has been transcribed. In addition to the first effect of the first invention, it is possible to greatly improve the color, reproduction quality of the audio signal, and video signal by converting the audio signal into PCM.

An embodiment of the present invention will be explained below based on the drawings. Simple 1
The figure is a block diagram of the recording device.
is supplied with a color video signal.

An audio signal is supplied to the audio input terminal (3). The audio signal is processed using a well-known method, and it is possible to process two channels at the same time, but in this case, only one channel is shown in the diagram. The chroma burst signal is extracted from this and sent to the phase comparator (2), low frequency filter,
Luther (3), VCO (-1 oppression-oscillator) (4), 1
The output of the VCO (4) is about 85881 x into the P, L, L loop consisting of the /8 branching device (5).
8 = 10.7 The phase is locked to the burst signal of the MHI input, and a continuous signal is obtained. This V CO(4
The output of 1 is approximately 1685 (by 1/4 branch 11 (6))
M le's 0! It is converted into a number and supplied to the adder (8th number).

On the other hand, the color video signal is supplied to the frequency base tl, it- (118) with an FM modulation of 1 m m (7), and the output of the adder (8) is input to the limiter (9 ζ),
k#M is limited. As a result, the output of FM Fangyu W (7) is minli! It receives duty cycle modulation from the viroft signal iζ which is output from i1 episode (6). QQ is a pulse generator, which generates a pulse connected to the synchronization signal from the color video signal, and outputs a small pulse (2) as the output of the pulse generator. ).Here, this pulse ■ is considered a horizontal blanking pulse.

The audio signal is filtered by a low-pass filter to remove high-frequency components (
(more than one in 20) are removed and converted into a 14-bit digital @ signal by a width converter QJK.

A 14-bit digital signal of 1<RAL is converted into a serial signal by a shift register and input to a RAM (random access memory). This bAMu is %
It is controlled by a ROM (Read Only Memory) and a controller, and the output of the RAM is converted into a data string whose head is a signal (called a 5YNC word) with a specific pulse pattern called a 5YNC bit. , encoded by the encoding (b) path αυ. In this case, this encoding −
The method (2) will be explained using a known encoding circuit called 8PM.

The output of the limiter (9) and the output of the encoding circuit o1) are I
Pulse generation 11 (R's /<
It is switched in synchronization with the pulse output and is supplied to the photometer. The laser beam is modulated by the optical modulator (g), and a signal is recorded on the disk (2) by a known method. The signal waveform during this period is schematically shown in Figure 12. Figure 2 (A) shows a part of the input video signal in Figure 1, (C) is the horizontal synchronization signal, and ■ is the chroma burst signal. be. In Figure 2 (8), the horizontal synchronization signal (c) and chroma burst signal (2) are replaced with the SYNC bit (c) and data bit), and this section is used as the horizontal blanking pulse part. You can get it with 2. Figure 0 shows horizontally the bits recorded on the disk using a laser beam tuned to f by the photometer shown in Figure 1, and section (7) is a video signal. 1 section 111 (a) is a signal obtained by changing the number of waves by 8.
When the digital signal is encoded using the PM encoding method, the interval (2) is the same as the interval - (g and S are respectively shown).

This J sea urchin video a! The signal and pilot signal, the audio signal are converted into digital signals, the fco signal is recorded, and then the video signal and pilot signal are recorded in this order. However, in order to use the bethescule portion of the video signal as a reference position during playback, it is recorded by one wave number shift by -m. Note that the Einao-Kyikago part is recorded by replacing the support signal island part with 5YNC bits of the digital signal in the same manner as described above. However, this 5YNC hint is a combination of the 5YNC bits of the horizontal period signal part that are continuous with the br gap of the equal pulse, and the 5YNC hint of another vertical direction signal (I! The configuration of the signal is shown in Figure 1.

FIG. 8(2) shows the i! of the input video signal. Near the direct synchronization signal,
A (to) indicating the degree part indicates the horizontal synchronization signal @, C1υ indicates the equivalent zf Lus, and - indicates the vertical phase signal. This figure 1 (4)
In the example, the signal is converted into a signal as shown in (in the example, Kanbata Zurin). In other words, the water slag synchronization signal (to) is 1SYN (: beep) v4 (corresponding to - in #12 diagram), ! I! - Part of the synchronization number is 5YNC with a different punishment.
As a result, the amplitude of the signal in FIG.
It can be seen that the size is small from the pedestal level to the white beak. In the eighth drawing, (to) is a 5YNC bit for horizontal synchronization t@ number identification, and (7) is a data bit for vertical synchronization signal identification.

In this way, the video signal part of the video signal is frequency-modulated from the analog signal, and the synchronization signal and chroma burst signal part are
The digital signal including the YNC bit is replaced with an audio signal.

Next, a specific configuration for digitizing and recording audio signals will be described. To simplify the explanation, here we will introduce the "Consumer PCM Encoder/Decoder" which became the EiAj standard.
An example using 007 as the basis will be explained.

v # 44 Figure IA) 41, 5TC-00717) % Case Nyor Horizontal Period Il! Showing the signal Sugi style in the d period,・
The data (128 bits) or the real and example data shown in the ``m4 figure wholesaler''.

Corresponds to the cheater period signal @V or 5 YNC bits (12 bits). For example, mallet is true (12B+12)
-140 bits is 0.145H as shown in Figure C)
In other words, about 9.2 μ% of people will be in the tm (transfer) section. This is 1 bit first period 9.2/140 Misaki 0
．． 066 μS or less. By the way, since the IIPM code is used by the encoding circuit Oυ in Fig. 1,
The minimum bit inversion interval is 16@. I want to do it 006
6μs
, 686MHz), or set this clock frequency to 107MHz, as it is convenient for playback systems.
M) (z (i.e. 8 of the chroma signal sub-gear
times). 17) As shown in Figure 4 (2), the minimum bit inversion interval becomes approximately 0.0118 μs, and a 140-bit signal can be inserted into a 92 μS interval (b). eye signal, a
is the white reference signal. Regarding the data signal, it is included in Standard 5TC-007, so a description thereof will be omitted.

Sorry, lol MII has explained this using a block code system based on ST (-007), but it can also be implemented in the same way with another code system such as a convolutional code.

In the explanation of FIG. 1, it was stated that the video t@ number was recorded by filling the frequency. In this case, with conventional video discs, as shown in Figure 5, frequency variation is performed at levels from 5YNC peak level to whitebeak level. On the other hand, in this embodiment, the 5YNC portion of the video signal is completely converted to a digital signal, so the range of the same wave number modulation is from the pedestal level to the white beak, as shown in Figure 6 (g). Can be specified. Therefore, if the variation range of the same 8#It number is provided, in the case of this embodiment, the quality of the video signal after recovery is improved accordingly.

That change 1! ra is 20k) g 1.4Q/1.00 =
It reaches as high as 8dB.

Next, use the above method to get 0! This section explains how to play a disc with a number recorded on it. Plane 6 diagram is block 1 of the endogenous device
It is. - is a motor that records the above-mentioned signal on the disk, and - is a motor that simultaneously rotates the own L18 disk. The saw is a laser generator, and the laser from the laser generator m passes through a lens, a beam splitter, and a tracking mirror, and then focuses on the tSS of the disk with a collapsing lens. The reflected light is reflected by a lens, a trough kink mirror, and a beam splitter.
The signal then passes through a cylindrical lens and is converted into an electrical signal by a photodetector. ζAlthough not shown here, the T, B, and C mirrors for jitter correction are also
The position of the beam spot on the disk in the cutting direction is also ll1l! I can do it.

Now, the output of the photodetector is FMuI style.
Mg' @ is decoded to video 401, at the same time bandpass filter 4 is pylob) fig (2,685M
Hz), and its output is a pilot (no.
Frequency division f: 2.686 MHz (compared with D reference tg2, and adding an excessive equalizer circuit (to) with '1'
llrt@sζ is supplied. - is a comparator and 1
``Yes, this comparator is a photodetector-v
] Slice the digital signal part of "output" at an excessive level and convert it to digital signal (S signal f. - is a clock (i! signal generator), and this clock signal generation -1 is the output of the comparator and 2 The output from the oscillator shaft is 10.7 Mlb.
A clock signal that is in phase with the digital signal output from the comparator is generated from the clock signal. - is a decoder, which is a decoding (b) path of IIPM, and its output becomes an NRZK code.

The NRZ color % is input to the shift register circuit along with the clock output signal of the clock signal generator, and compared with the 5YNC hit generator, and a pulse signal is output every time a 5YNC hit is detected in the match detection path 1. . In this way, an f:SYNC pulse is obtained in response to the 5YNC bit. This 5YNC pulse is generated by the 5YNC generator -
, and generates the vertical synchronization signal, horizontal tIllL1 period, etc. that originally constituted the video signal, and 5YNC
and a burst signal adder, and output as a video output to the video output terminal pre-control. The serial output of the shift register circuit is input to the RAM (Random Access Memory), and the A converter arranges the pulses in a form that is similar to analog data.
Analog a! via a filter and a D/A converter. An audio signal converted into a signal is obtained at the audio output terminal. The control 0-1K*ll is the output of the clock @signal generator-, and generates a signal for incrementing the RAM- by -1411 based on the clock signal generator, 5YNC pulse, etc.

b, 5YNC generation 11 @Nyo] The obtained horizontal synchronizing signal output is input to the F/V converter edge, converted to a voltage indicating the rotational speed of the disk, and then passed through addition 691 to the IJ
C amplifier (to) increases #ItA, rotates the disc motor @ narrow, always 5YNC generator - output water * hook period 0
It operates so that the number 1 II4 wave number is constant.
'' At the same time, the pilot signal, which is the output of the bandpass filter σ匈, is
The phase is compared with a single signal, passed through an equalizer (to), amplified by a DC amplifier, IIJJ T, B,
By controlling the C mirror (jitter correction #l mirror) and changing the tangential position of the beam focused on the disk, the phase of the reproduced viroft signal can be adjusted.
i! 1121 so that it is locked to the reference signal which is the output of +1#8Vs.

As a result, the phase of the reproduced digital signal locks with the output of the clock signal generator.

The output of the oscillator V4J is divided into 1/8 by the divider 4, and converted into a sine wave by the bandpass filter 611.
% 17) The signal is added to the video signal as a chroma burst signal by 5YNC and burst signal adder,
The original color video signal can be obtained from the video output device. Note that the bandpass filter is chroma (P1
It has a phase corrector that corrects the phase with the signal.

In this way, the front and back parts of the synchronization signal part of the video signal are converted into digital signals, and the synchronization signal is converted into a digital signal.
By replacing the audio signal with the C word, interposing the audio signal with the digital signal and aligning it with the 5YNC word, and recording the chroma burst signal on the disc using the tuty cycle, it becomes possible to record the audio signal as a PCM. The video issue is leg wave i over the pedestal part! Weird r-completion playback video iHI! Ff) S
/N has been improved, and the playback quality of audio rIi and video tf4@ can be greatly improved.

As mentioned above, according to the invention of this-811, the video signal is transmitted above the pedestal portion &! [Since it can be modulated, the S/N of the endogenous video signal can be improved by 11.

According to the invention of Hon-Kan 2, it is also possible to record the audio signal as PCM, so the reproduction quality of the audio signal and the audio signal can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a recording device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of a signal waveform recorded by the recording device shown in FIG. 1, and FIG. l! FIG. 4 is an explanatory diagram of the waveform near @sync #@, and FIG. 4 is an explanatory diagram of the recording signal format in an embodiment of the present invention. Figure m5 is an aIJ diagram of the deviation of the circular mantissa variable, and Figure 6 is a block diagram of a reproducing apparatus in an embodiment of the present invention. @-1...Horizontal dosukeho number, (2)...Chroma burst signal, (2)...Horizontal blanking pulse, Foundation
-...S YNC bit, (c)...Data bit, (2)...Equivalent pulse, (2)...Vertical synchronization signal, ■...5YNC bit for horizontal synchronization signal identification, working・
・-I! t & synchronous signal synchronous signal identification data @υ...
Data assistance signal, -1...data, ring...5YNC
Chip, al1631... White Beak, -...
Pedestal level agent Yoshihiro Morimoto Figure 1 Figure 4 io
r8] Figure 5

Claims (1)

[Scope of Claims] 1. A recording and reproducing method that converts at least the synchronizing signal portion of a color television signal into a specific digital signal, and records and reproduces the rc signal on a recording medium using a different signal method than the signal portion other than the − period signal portion. . 2. A patent that converts the equivalent pulse signal of a color television signal and the horizontal synchronization pulse signal into the same digital data signal, records the vertical synchronization signal part with additional digital data, and detects the vertical IA synchronization signal during playback. Claim Iil
! Recording and reproducing method described in Section 1 of Song Theory. 8. Claim 11 in which the deviation when the color television signal other than the sync signal part is modulated by the frequency fa is at least the same as the deviation when the color television signal including the sync signal part is modulated by the frequency fa.
Recording/playback method described in section. 4. Converting at least the synchronization signal part of the color television signal into digital data having a shorter time duration than the hook & FI signal part, and converting the synchronization signal into a digital signal to generate the specific digital signal mentioned in 1. and the digital signal part of the color vision signal other than the synchronized part is changed in frequency, and the digital signal part described in III is FM connected or encoded, and both are recorded on the KK format. , a recording and playback method that plays back. b. The recording internal generation method according to claim 4, wherein a signal including at least a pedestal portion of a color television signal is frequency-modulated and used as a reference for the temple level during reproduction. 6. Converting a color burst signal of a color television signal having a chroma signal into another pilot signal synchronized with the chroma signal, and recording the same in four parts. Recording and playback method described. 7. Pilot Hakugo and Digital 0! I record my nephew's clock number 11M and use at least the pilot signal when playing back the 1st digital tt! The recording/reproducing method according to claim 16, wherein the recording/reproducing method uses a black signal of the same number.