JPS61127286A - Video reproducing system - Google Patents

Abstract

PURPOSE:To eliminate the variance of hue at the still picture reproducing time to obtain pictures of high quality by storing a reproduced video signal in a memory synchronously with the video signal and leading out the video signal stored in the memory synchronously with a signal having a preliminarily determined frequency thereafter. CONSTITUTION:The video signal of the first field is stored in an analog field memory 11 through a changeover switch S1 by a transfer clock synchronized with jitters. The video signal of the first field is led out from the memory 11 by a pulse which is not synchronized with jitter and has a certain frequency, and this video signal is stored in the memory 11 by the pulse having a certain frequency. Thus, all reproduced pictures of the first field are obtained continuously. In case of the input of the video signal including jitter, the transfer clock synchronized with jitters is used for the first input and another fixed transfer clock which is not synchronized with jitter is used as the transfer clock for reinput in this manner to reduce jitter of the video signal outputted to a video circuit 22.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a video playback system that removes a shifter whose time axis is varied when playing back a video signal recorded on a video disc or the like.

If the video signal being played contains 7 ts, the quality of one side will be degraded, and there will be some force when playing still images. -The hue of *ffi deteriorates considerably. Therefore, it is necessary to remove jitter from the reproduced video signal.

In the prior art, variable i! to remove jitter t-! !
Correct from line extension i! Place the PCM pulse and press the playback signal once! ! 1 for W4 signal! Instead, a device such as a digital TVC (time base corrector) is used which absorbs knocks using memory.

Problems to be solved by the invention μ
Iin is expensive ^(, not practical.

An object of the present invention is to provide a video playback method that eliminates the shifter of the video signal to be played back using a simple configuration, thereby eliminating hue unevenness during static image playback, and making it possible to obtain a high-quality H image. The goal is to provide the following.

Means for Solving the Problems The present invention provides a video reproduction system that reproduces a video signal including a synchronization signal, a luminance signal included in the synchronization signal plane, and a carrier color signal. This is an @image reproduction method characterized by storing the stored video signal in the memory in synchronization with , and then deriving the stored video signal from the memory in synchronization with a signal having a predetermined period tILrL.

According to the present invention, a reproduced video signal is stored in a memory in synchronization with the video signal, and then the stored video signal is derived from the memory in synchronization with a signal having a predetermined frequency. By doing so, it is possible to eliminate knocking, thereby eliminating hue unevenness, image horizontal shaking, etc. during still image reproduction, and obtaining a high-quality image.

Embodiment FIG. 1 is a block diagram of a video playback system according to the present invention, FIG. 2 is a block diagram of a transfer lock generation circuit 16, and FIG. 3 is a schematic diagram of a storage area 2 on a video disc 1. FIG. 4 is a diagram showing a video signal derived from the reading device 4/7. In video reproduction method 3, a recorded signal with 7% P is output on video disc 1. It comprises a reading device 4 for reading, means 5 for eliminating knocks in the video signal reproduced by the reading device, and a cathode MW7 for displaying the video signal from the jitter eliminating means 5. ill! 4 is the third
The video disc 1 includes the illustrated video disc 1 and a read head 8 disposed facing the storage area 2 of the video disc 1, and the video disc 1 includes a plurality of tracks T1 to T1 of the same size.
It has an entrance area Ia2 consisting of a T-entrance.

) One track in the 71i area 2 includes the 4 fields V + Ily V tne V 3n shown in FIG. 4 (1).
A signal corresponding to the image of t V 411 is recorded, and the read hect 8 is controlled to move inward in the radial direction of the softening magnetic disk 1 in accordance with the track switching pulse. When reproducing a V stop FII image, the reading head 8 is fixed on the track T to be reproduced, and reads the recording signal of detailed 4 fields VB+ to V, a in g kg.

The video signal read by the dismounting hect 8 is #
11 ilW#, d of the synchronous separation circuit 9 and clamp circuit 10 uplink changeover switch St included in the illustrated separation device 5
st*! ? (:z71tJ'i73 respectively.The second video signal is the synchronization signal and the same '14ff
The pedestal level of the video signal is clamped (fixed) to a constant level in the clamp circuit 10, which includes a luminance signal and a carrier color signal included in the signal bolt, and a synchronization signal includes a horizontal synchronization signal H and a vertical synchronization signal. T,? in! 4 to the individual contact 811 of the changeover switch S1, and to the individual contact 812 of the changeover switch S, the line 1
A re-input video signal is provided from the amplifier circuit 12 via 912 . The video signal from the common contact 313 of the changeover switch S is line! COD via 5 (char 7
・Input to the analog field memory 11 realized by a coupled device) or a BBD (packet predate device).

The analog field memory 11 has a capacity that can sequentially store one field's worth of video 6i1Fi numbers, and responds to a transfer lock, which will be described later, and synchronizes with the transfer lock. Line 1 of store contents sequentially
6, and the subsequent 1 by the derived amount.
Is it possible to store video signals for one field? in16
The video signal derived from the line! 7 to the synthesis circuit 15, and various synchronization signals such as vertical, horizontal, clamp, and blanking date pulses are synthesized into TWIN! 13. ? The output from input 713 is amplified by amplification circuit 1Hr12, level-adjusted, and applied to side contact S1□ of selector switch S1 as described above.

On the other hand, the video signal from the reading device 4 is given to the sync separation circuit 9 via the line 11, and the 2-in//
The signal is applied to the oscillation circuit 15 via 14. A synchronization separation circuit 9 separates a vertical synchronization signal V and a horizontal synchronization signal H from the video signal, the vertical synchronization signal (2) is derived from the fin 7a, and the horizontal synchronization signal H is derived from the line 19. The vertical synchronization signal V and the horizontal synchronization signal H are connected to the branch line J!
1-0° and /11 to the synchronous control circuit 14, respectively.

The synchronization control circuit 14 includes an oscillation circuit 15, a control circuit 20, and a skipping lock generation circuit 16. It is a circuit realized by an 11 wave number synthesizer PLL etc., 7Fll.
The pulse is sent to the control circuit 2 through the fin/15.
0 and to the transfer lock generation circuit 16 via line 116. The vertical synchronization signal V from the synchronization sublayer 189 is line! Branch line from 10, e i 1
, , / 17 to the soft feed port 9 generation circuit 16 and the control circuit 20 .

The transmission lock generation circuit 16 includes a changeover switch S3 shown equivalently as shown in FIG. 2, a signal processing circuit 17, and a drive circuit 1B.

One of the selector switches S! 1 contact 331 has line J! A pulse synchronized with the jitter is given through the line 16, and the line ! 15 and the branch office J! by 'C frequency division 419. ! ! l14J for the jitter! 7IL no pulse is 4 older brothers. Cut 9
The output from the common contact 333 of the transfer switch Ss is given to the signal processing circuit 17 via a line 720, and horizontal and vertical transfer locks are generated by this signal processing circuit 17. 21 to the analog field memory 11. With this pine feed lock, the Anamig feel 1r memory 11
7*The production and transfer operations are performed in a third manner. Also, the changeover switch SS is Fin J! A control signal via 22 controls the switching behavior. That is, when the signal 61 of the first field including book- is applied to the fin 11, the individual contact S3+ of the changeover switch S and the common contact S23 are electrically connected. Vertical synchronization signal from the synchronization separation circuit 9 including this y7ter ■ Upward horizontal synchronization signal H
Based on this, signal processing is performed in the signal processing surface &) 17, and the video signal from the fin 15 is stored in the analog field 7 and 11 in synchronization with the video signal including the knock. The delay time amount of this analog field memory is t
The value is expressed by the Ai formula.

r = B/fek = (1) Here, B represents the number of pits stored in the analog field memory iQb, and fek represents the number of pits stored in the analog field memory, and fek represents the number of pits stored in the analog field memory. If a transfer signal synchronized with the knocker is used for the input video signal 11, knocks in the video signal derived from the analog field/series 11 can be removed.

In the synthesis circuit 15, the video signal derived from the γ analog field memory 11 via the low-pass filter 13 is
Synchronization (Each synchronization of the Kufunbu, horizontal, and direct blanking date pulses from the J number generation circuit 21 (G number is synthesized, and the line 7 is output as an image a! signal with Mli for one field.
From i3 to changeover switch S, [IjFIJ contact S!
+ and to the amplifier circuit 12 via line e23.

tP, the image signal is amplified and level-adjusted in the amplification circuit &) 12 and re-entered via the line 7i2 to the individual contact S1 of the changeover switch SI. The changeover switch S is configured to connect the individual contact 811 and the common contact J:
tS l 3 conducts, and from the amplifier circuit 12 1 to 3
Field! ! While the extended video signal of the first field is re-inputted to the contact point S1□, B
The changeover switch S2 is driven and controlled by the control circuit 20 so that the contact 312 is electrically connected to the separate contact I1. S! ! and the common nests are electrically connected, and while the video signal of the first field which has been delayed for 1 to 3 fields is applied to the individual contacts S and -2, the individual contacts 8
Same as 11 i11 later point S! The drive is controlled so that the two are electrically connected. This changeover switch S! The video signal from the common contact Sts is line! 22 to the video circuit 22, and the video signal from the video circuit 22 is sent to the drive circuit 2.
3, the image is displayed on the cathode ray tube 24.

During still image playback, among the video signals from the reading device, the video signal V, n of the first field in FIG. 4(1)
is applied to the video circuit, and the transfer lock synchronized with the jitter via the changeover switch S1
The video signal of the first field is derived from the analog field memory 11 by a pulse having a constant frequency that is not synchronized with the zero-order knock stored in the tweed memory, and is transferred to the synthesis circuit 15 and applied to the video circuit 22, and is amplified. It is stored in the analog field memory 11 via the circuit 12 by pulses having a constant frequency.

In this way, static reproduction side images of the first fields V and n shown in FIG. 4(4) are successively obtained.

When inputting a video signal containing jitter like this,
At the first input, a transmission lock synchronized with jitter is used, and a fixed transmission lock that is not synchronized with knock is used as a transmission lock for the output and for re-inputting the video signal delayed by 1/field. By using this, knocking of the video signal output to the video circuit 22 can be reduced. As a result, it is possible to eliminate unevenness, horizontal vibration, etc. when reproducing both static images, and it is possible to obtain high-quality images.

In the above-mentioned embodiment, only the video signal for the first field was stored in the analog field memory 11, but for example, video signals for 17 frames are stored, and the stored contents are determined by a synchronization signal that does not include jitter. The configuration may be such that the information is derived.

The video playback method according to the present invention is not limited to video disk recording and playback devices, but can be used in a wide range of applications such as magnetic tape recording and playback devices. It can be implemented across sectors.

Effects As described above, according to the present invention, a video playback signal is stored in a memory in synchronization with the video signal, and then the stored video signal from the memory is synchronized with a signal having a predetermined frequency. By deriving it, it is possible to reduce knotters, thereby eliminating hue unevenness, lateral distortion, etc. of reproduced images.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a video playback system according to the present invention, and FIG. 2 is a block diagram of a pin forward lock generation circuit 16.
FIG. 53 is a diagram illustrating the structure of the store area 2 on the video disc 1, and FIG. 4 is a diagram showing a video signal derived from the reading device W14. 3... Video playback device, 9... Synchronization separation circuit, 11.
... Analog field memory, 13... Synthesis circuit,
14... Synchronous control circuit, 16... Pine feed lock generation circuit, 17... Synchronous signal generation circuit

Claims (1)

[Claims] In a video reproduction method that reproduces a video signal including a synchronization signal and a luminance signal and a carrier color signal included between the synchronization signals, the reproduced video signal is stored in a memory in synchronization with the video signal. A video playback method characterized in that the video signal is stored, and then the stored video signal is derived from a memory in synchronization with a signal having a predetermined frequency.