JPS6113780A - Video disk device - Google Patents

Abstract

PURPOSE:To attain the stable and assured reproduction of video signals by revolving a disk at a fixed linear speed in response to the signal obtained by separating and detecting a pilot signal in a reproduction mode. CONSTITUTION:The frequency of the reproduced video signal is equal to a prescribed level when a disk 1 is revolved at a target linear speed. This assures a separating action of a positive pole synchronizing signal. Here the video signal which is FM modulated by a video signal reproduction processing circuit 13 is formed into a pulse signal HD synchronous with the phases of horizontal synchronizing signals HD1 and HD2. The reproduced and separated signal HD is sent to a jitter controller 9 for phase comparison with a reference signal. Thus the jitter is detected and a jitter correction signal is produced. This correction signal is supplied to an actuator 4, and a pickup mechanism 3 is shifted in the tangential direction of the recording track of the disk 1. Thus the jitter of a reproduced video signal can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a video disk device, in which a disk-shaped recording medium (hereinafter referred to as a disk) on which a video signal such as a positive polarity synchronizing signal is distributed is used. Equipped with a motor control device suitable for rotational driving at the linear velocity of the foot. The present invention relates to a video disk device.

[Background of the invention]

The current similar TV system, f) "Ue, has significantly higher resolution than the NTbC system. This is the same as the 4vF reduction of the so-called Akane quality television system. With this increase in quality, Because the required transmission bandwidth is wide,
When putting it into commercial use, the technology to reduce the video signal band LJ gives you peace of mind. Regarding this, J! By using an effective technique that significantly compresses the band near f, M U S E (Mu, 1tt
plt 5ub-Nyqat! t5ampitnlE
ncodμg) method was proposed.

The contents of this NobaUSE method are described in the Technical Report of the Television Society of Japan, 6. 〆OL, 7, NO, 44 (March 1984
Power), Jiro, Otsuka, Kazutakayo φ” Shoshin TV Mamoru M
1 channel transmission method (MUSE)? Published at °C
There is. With this technology, as shown in Figure 2, two chromaticities iM @'r' + '- or horizontal set)' are time-division multiplexed with the luminance signal Y in line-sequential fashion every 14 periods. , and horizontal synchronization@No.E77, , 1iD2 and F1/--Muhars Fp are multiplexed with so-called positive polarity at a level that does not exceed the attack width of the luminance signal or chromaticity signal. This kind of stop) V! , when using the synchronous method, the so-called lff1
Since #l loss is eliminated, there are 40 points where the Sl ratio of the transmitted video and video signals increases.

Regarding the reliability of separating and detecting the positive polarity synchronization format multiplexed in this video signal, as mentioned above, according to the above-mentioned experiment, the IJJ design has a phase lock of 9rM, which is practical. It says there is no problem. If the frequency of the human-powered video signal hardly changes, such as when multiplying the number 16 sent from a broadcasting station, malfunctions may occur. 21
As shown in Figure 2, these 7 frame pulses are identified using the percentage sign that life No. 0.605 and frame pulse pp of line # (/, 606) are mutually inverse. If the frequency fluctuates significantly, this identification may malfunction.

This becomes particularly blurry when reproducing a disc on which video signals are recorded at a constant linear velocity. Even if the training speed fluctuates significantly at startup or access.

With the Hozuka signal of negative polarity synchronization format such as the NTSC system, the synchronization signal can be easily and accurately detected by amplitude separation, so this playback synchronization signal can be used to adjust the disc so that the carp weight is constant. The motor can be controlled. On the other hand, in the case of a video signal in a positive synchronization format such as the above-mentioned MUSE method, separation detection of this positive synchronization signal is detected when the source of the signal changes significantly at startup or access. There is a risk that the functions may malfunction.

In addition, if an attempt is made to prevent this malfunction, the circuit for identifying it becomes complicated. , #J Speed - To provide a video disk device which can reproduce video signals stably and reliably by controlling the rotation speed.

[Summary of the invention]

In order to achieve the above-mentioned objects (14) and 4&, the present invention provides that, when recording a video signal having a normal image synchronization signal on a disk at a constant speed, in accordance with a signal that separates and detects this signal during playback, Control 1flJ so that the disk rotates at a constant NM speed.

[Funny example of invention]

Hereinafter, the present invention will be explained using the drawings.

Figure 1 is a 1072 diagram of an optical video disk device showing an embodiment of the present invention. In FIG. 1, a brightness signal Y and two chromaticity signals C, , C, as shown in FIG.
IIIJ Periodic Report-wjFP.

B! with HD, and HD! R, the image signal and the tintal audio signal compressed and multiplexed during the vertical return period of this video signal are both FM modulated and recorded, and this FM'jiN video signal is And a pilot signal having a predetermined frequency is generated more frequently than the audio signal.

It was previously recorded as a spiral-shaped track with a quick ash. this? ls speed - If the foot method is used, the recording density will be the same on the inner and outer circumferences of the disk, and the number of revolutions -
You can obtain a faster record time than the foot method.

During reproduction, the original beam is irradiated from the pickup barrel 5 onto the N signal on the disk 1 which is rotationally driven by the disk motor 2, and the reflected light, that is, the N signal modulated by the above information is detected and converted into an electrical signal. and sends it to preamplifier 5. The signals output from the 1 rear/g 5 are subjected to necessary No. 16 processing as appropriate in the voice signal re-sho processing circuit 13 and the audio signal re-main processing circuit 14, and the respective outputs are given the nr violet image. Signal and audio No. 1d are superior.

The position of the BACKAG model 3 is moved in all three directions by a three-dimensional actuator 4 using, for example, an electromagnetic coil, and focus control, tracking suppression, and jitter correction are performed. First, the appearance of 1 Rianno 5 is sent to 7 orcus system @ J device 6, and the focus error N
According to the output, the big roller 1st part m3 is moved in the direction of the disc 1 via the actuator 4.

The distance mt to the recording surface of the disk 1 is controlled, and the self si and 4 are adjusted so that 7 orcuses become itE. The output of Briand 15 is then sent to tracking control device 7, depending on its tracking error output.

The pickup mechanism 3 is moved through the actuator 4 in the radial direction of the disk 1, that is, in the width direction of the recording track, and tracking is controlled so that the information formed on the disk 1 is accurately irradiated with a single beam.

While focusing and tracking are controlled in this way, the output of Bria/15 is sent to the low-pass filter 10. This low-pass filter 1011C removes the Miyakonojo video signal and audio signal, and separates and extracts the low-frequency pilot signal 4. The separated Byron z and tg are sent to the Gansoku thigh decoration circuit 11, and the circumference rH
The L number is discriminated and a tow speed control signal having a voltage value corresponding to the reference station tN and the base station number is formed. Alternatively, the separated pilot signal is compared to the phase of the reference signal in the speed control cycle %11.

A linear velocity control signal having a voltage value corresponding to the phase difference is formed. Then, this gland speed summer control signal is applied to the motor drive time M1.
By supplying the disc motor 2 through 2L,
Turn off the disc 10 times so that the speed is short! l
I control you.

In this way, when disk 1 rotates at the target initial velocity, the frequency of the 418 main video signal becomes the frequency of the shield wing, so the minute drive operation of the 418 main image signal becomes ridiculous. Therefore, the FM change is made using the FM processing circuit 13! The +4-increased video value enters the horizontal faj period individual signal separation circuit 11188, and forms a pulse signal B with ID3 period at the phase of positive polarity horizontal 1 to 1°B1)2. This PJ main separated horizontal 1t + I M 18 H4).

9 in the jitter control device, the jitter is detected by comparing the phase with the reference signal, and a jitter bucket JIE number is formed.

By supplying this jitter to the m8wy controller 4 and moving the pickup mechanism 3 in the direction of the recording track of the disk 1, the jitter of the °C, reproduction P, and calculation signals is controlled to be reduced.

In FIG. 1, access is achieved by moving the entire Kuji thread such as Bicara 1 Shin 4g3, and the slider for controlling the insertion is omitted from illustration.

Note that in the above actual IM example, the pilot signal does not necessarily have to be in a synchronous relationship with the video signal.

However, in order to reduce interference to the video signal, it is preferable to establish a synchronous relationship rather than an asynchronous relationship, and furthermore, it is desirable to regulate the pilot signal so that it is in a frequency interleaved relationship with the video signal.

Furthermore, in the above embodiment, a method has been described in which the audio signal is compressed coaxially and multiplexed within the vertical nullification period of the video signal, but as shown in FIG.

The audio signal is converted to PCM to give a low frequency range, and F M
It is also possible to record the image signal by combining it with the KaI4 video signal. In this case, if the frequency of the pilot signal is selected between the audio signal and the video signal as shown in Fig. 3, the frequency of the pilot signal can be made high, and therefore the miX This is convenient because the sampling rate for frequency detection becomes high and the gain of the control loop can be increased.

However, at this time, the "jc+-bus filter 10 shown in FIG.
It becomes necessary to separate the pilot signal by removing not only the defined video signal but also the low-frequency audio signal by using a band-pass filter or the like. This limits the range in which the pilot signal frequency can be detected.
All you have to do is cover the control range of Toga Sakura degree that is originally required.

It doesn't matter in battle. In addition, in the brown 3 figure.

Instead of the above-mentioned PCM signal, an FM modulated audio signal may be used as the audio signal.

In addition, in the example above, we explained a method of recording the video signal by FM modulating it and frequency-multiplexing the low-frequency pilot signal, but the frequency band of the baseband video signal shown in Figure 2 is Bi a of 8 wave numbers higher than
This video signal and the pilot signal are both FM modulated and recorded on a disk using the ! + FM during metaplasia
It may be configured such that after '491i, the low frequency video signal is removed by a bypass filter and the high frequency pilot signal is separated and detected.

Further, in the above embodiments, a video disk device of the original type was explained, but the present invention can also be applied to other types than the one-element type.

Further, in the above embodiment, #! is generated by the regenerated pilot signal. We have explained the first configuration example in which the speed is controlled to be constant, but when the speed is within the range preset by ftM Unryo, the positive synchronization signal is separated No. 18 (frame pulse F
A second configuration may be used in which the vertebral leg control using P or/and the horizontal synchronization signal BI)) can be performed. (or Nyu Bairotsu) (Ft is used to control the rotational speed of the disk motor, and the above-mentioned playback synchronization signal is used to control the rotational phase of the disk motor.
It is also interesting as a composition. In addition, in the case of these 7m2113, it is also possible to switch from control using the frame pulse Fp to control using the horizontal synchronizing signal l1l).

Furthermore, in the above-mentioned center 21' [i example, we have explained an example in which jitter is detected using the reproduced horizontal synchronization signal HD, but it is not only possible to control the axillary speed to a constant level using the re-main bit signal (this reproduced It is also possible to detect and correct jitter using a pilot signal.When using a pilot signal for this / ivy correction, the configuration is as follows: instead of horizontal synchronization A 8 x 11D in Figure 1, 8 main pilot jitter + 3' This device 9 compares the phase of the student bit signal with the phase of the reference signal to detect jitter and form a ntsuta correction index, and also processes this jitter packing. It is possible to supply a positive signal to the actuator 4 and move the 6 of the big controller 1 to reduce the jitter of the image signal. The reproduced image signal is transmitted via a variable delay circuit using a CD, etc., and is formed from the Nyu bit signal, or by circuit means such as creating the above-mentioned variable delay circuit with the Niu bit signal. A configuration that reduces jitter may also be used.

[Effects of the Invention] In summary, according to the present invention, it is possible to play back a disk on which a video signal, such as a positive polarity 1/M signal, is recorded by controlling its rotation at a constant linear velocity. It is easy, stable, and reliable, and video disc #c rice that has passed the quality television management system is superior.

[Brief explanation of the drawing]

Figure A1 is an embodiment of the present invention; a block diagram of a videotask device using the BOSS method; brown 2nd floor is a modified version showing an example of a video signal having a synchronization signal according to the invention; Showing 73 8-wavenumber allocations related to the Inventive Pond's Shorikiyama example.
It's evil. 1... Disk 2 River disk 7-ta 3...
Hiccup 1a structure 4... Three-dimensional actuator 5... Fourier amplifier 8... Horizontal synchronizing signal separation concave path 9... Jitter control device 10... Low pass filter 11... Linear velocity control circuit 12... Motor drive circuit 13...Video signal reproduction processing circuit $1 Figure introduction 3 Figure 1 No.S Procedure amendment (Method) Table of cases, No. (1981 patent application No. 133124 Name of invention Relationship with Patent Applicant Name '510.11] Ceremony 11th
Contents of the application and the amendments made by the person who made the application The # that was the first to be cold to the application and the application!
AI&JIIF consonants: As shown in the attached sheet (no changes to self-answers)

Claims (1)

[Claims] 1. A disk on which a pilot signal of a predetermined frequency is recorded at a constant linear velocity while being superimposed on a video signal and an audio signal, and upon reproduction, the signal recorded on the disk is reproduced. A pickup mechanism, a device that separates and detects the pilot signal from the reproduced signal, a device that discriminates the frequency of the reproduced pilot signal, or a device that compares the phase of the reproduced pilot signal with the phase of a reference signal. Control for rotating the disk at a constant linear velocity by supplying an output signal from at least one of the one device and the frequency discriminator or the phase comparator to a motor that rotationally drives the disk. A video disk device characterized by being equipped with a device. 2. Allocating a high frequency band to the video signal, allocating a low frequency band to the audio signal, and setting the frequency of the pilot signal to a frequency between the band of the video signal and the band of the audio signal, The video disc device according to claim 1, characterized in that frequency multiplexed recording is performed. 3. A disk on which a pilot signal of a predetermined frequency is recorded at a constant linear velocity while being superimposed on a video signal and an audio signal, a pick-up mechanism that reproduces the signal recorded on the disk during reproduction, and the reproduced signal. a device for separating and detecting the pilot signal from a reference signal; a device for discriminating the frequency of the regenerated pilot signal; or a device for comparing the phase of the regenerated pilot signal with the phase of a reference signal; a control device that rotates the disk at a constant linear velocity by supplying an output signal of at least one of the discriminator and the phase comparator to a motor that rotationally drives the disk; and a control device that rotates the disk at a constant linear velocity; What is claimed is: 1. A video disc device comprising: a device for comparing the phase of a reference signal with a phase of a reference signal; and a device for reducing jitter of the reproduced signal using an output signal of the phase comparison device. 4. Allocating a high frequency band to the video signal, allocating a low frequency band to the audio signal, and setting the frequency of the pilot signal to a frequency between the band of the video signal and the band of the audio signal, The video disc device according to claim 3, characterized in that frequency multiplexed recording is performed.