JPS6184986A - Field delay equipment - Google Patents

Abstract

PURPOSE:To simplify a structure of a clock generator circuit in order to simplify a structure of a delay equipment by not inputting video signals to a field memory during a blanking period and decreasing the quantity of signals inputted to the field memory. CONSTITUTION:After the level variation of input video signals is eliminated in a clamp 1, the video signals are inputted to a field memory 4 through a switch 3 of an eliminating device 8. This switch 3 is switched to the output from an amplifier 12 by the control of a switch control 5. The control 5 is activated by a command signal from an input terminal 6 and synchronized with the output of a synchronizing separator circuit 7. The video signal excluding a blanking period is inputted to the memory 4, delayed horizontal and vertical transmission clocks from a delay clock generator circuit 9 are added and the output signal is supplied to a mix circuit 11. The output from a synchronizing signal generator circuit 14 and a continuous wave generator circuit 20 is also added to the circuit 11. Thus, the structure of a field delay equipment is simplified.

Description

Detailed Description of the Invention (Technical Field) The present invention provides a method for converting images recorded on a video disc into still images.
1) Regarding the field delay device used to generate
Let's go.

(Prior Art) On a video disk, two or four field signals are recorded in one revolution, and therefore, even if a normal track on which a moving image is recorded is played back in a still frame, the image will be blurred.

A field delay device eliminates this image blurring by repeatedly outputting the same field signal using a field memory and reproducing a still image, but in the past, the horizontal and vertical retrace lines were The video signal during the blanking period was also input to the field memory.

However, in the case of the conventional example having such a configuration, the amount of signals manually input to the field memory is large, and the number of hits in the field memory is large.
It had the disadvantage of being expensive.

(Objective of the Invention) The present invention has been made in view of the above circumstances, and is aimed at reducing the field memory (-human input information) during still playback. (Structure of the Invention) In order to achieve such an object, the present invention provides a means for removing a blanking period from an input video signal, and a field delaying means for field-delaying the video signal from the removing means. , a field memory that outputs this as a delayed video signal, a synchronization signal generation circuit that generates a synchronization signal phase-locked to the input video signal, and a color subcarrier continuous wave that is phase-locked to the burst signal of the input video signal. and a mixing circuit that adds the synchronization signal and the burst signal to the delayed video signal.

In other words, the video signal is not input to the field memory during the blanking period, thereby reducing the amount of signal input to the field memory.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings. FIG. 1 shows an embodiment of the field delay device i'j of the present invention with small
t:1 is input end 1゛2, L:'-,+'4
1. This is a clap that inputs the H No. by 1 degree - 1 and removes the influence of 13 le fluctuations. Therefore, the human-powered Hifu 1 O Shinyumi from this Clap 1 is input without the influence of the level rush at Clap 1. After being removed, it is manually input to the field memory 4 via the manual switch 3. The tffgE manual switch is configured to be switched in response to a control signal from the third control 5. The front switch control 5 is put into an operating state by a command signal from an input terminal 6, and in this operating state, the control signal is outputted by a synchronization signal from a synchronization separation circuit 7.

Therefore, the video signal excluding the blanking period is input to the field memory 4. The manual switch 3, switch control 5, and synchronous separation circuit 7 are collectively referred to as removal means 8.

iii Field memory 4 Synchronization separation circuit 7
In response to the horizontal and vertical transfer locks from the transfer lock generation circuit 9, which are generated based on the synchronization signals from It has become.

The delayed video signal from the field memory 4 passes through a low-pass filter IO to remove the clock, and then is input to a mix circuit II. In this mix circuit 11, as shown in FIG.
A vertical synchronization signal SI and a burst signal S are added,
As a result, the delayed video signal A is further transmitted from the mix circuit 11! The signal is configured to be output as a field-delayed delayed video signal B.

Said mix circuit! The delayed video signal from (1) is amplified by the amplifier I2 so that the video level at the manual switch 3 becomes the same, and then is manually supplied to the manual switch 3 constituting the removal means 8 via the amplifier 12, and further It is delayed by one field in field memory 4. In this way, this embodiment is configured to obtain a video signal delayed by two or three fields.

Reference numeral 13 denotes an output switch that operates in response to the foot I roll signal from the Sugi 1-chi control 5. A video signal is input, and to the output terminal 21, a non-delayed input video signal is output for the field section played from the video disk, and the other 3 fields are output from 1 to 3.
A field-delayed delayed video signal is output, so that the output switch 13 outputs 4
The same video signal is output from all fields, allowing still playback.

The aforementioned horizontal and vertical synchronization signals are phase-locked to the input video signal based on the synchronization signal from the synchronization separation circuit 7, are generated by the synchronization signal generation circuit I4, and are input to the mix circuit +1, where the water; - The vertical synchronization signal is configured to be mixed with the delayed video signal.

The above-mentioned burst signal consists of a phase comparator 515, a low I inverter filter 16, a crystal filter, a control type 211v
The burst signal from the continuous wave generating circuit 20 is also given to the mix circuit 11, where the burst signal is It is designed to be mixed into the continuous video signal.

That is, for the burst section of the input video signal, the phase is compared with the output from the voltage-controlled oscillator 17 by the phase comparator 15, and the oscillation frequency of the voltage-controlled oscillation Z-s I7 is controlled by the error signal to determine the output of the input video signal. A color subcarrier continuous wave phase-locked to the burst signal is generated.

Next, a burst signal is generated by the output pulse from the burst gate 18, and the phase shift between one field is corrected by the phase shifter 19, thereby obtaining a burst signal to be added to the field delay signal.

(Effects of the Invention) As described above, according to the present invention, the amount of signals input to the field memory can be reduced. -S1. '／I'tノ4shi' began to sound like 'I1'. Furthermore, during the blacking period, there is no need to transfer the lock from the clock generation circuit to the field memory, and during that blacking period, the clock from the clock generation circuit cannot be used to drive or stop other devices. 111 can be easily used as a control signal for a video, and when designing and manufacturing a video, the configuration of the clock generation circuit can be simplified, and manufacturing can be made more inexpensively and easily.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the field delay device of the present invention, and FIG. 2 is a diagram illustrating the amount of video signals input to the mix circuit from the field memory and the amount of output video signals. 4 - Field memory, 8 Elimination means, II - Mix circuit, 14 Synchronization signal generation circuit, 20 Continuous wave generation circuit. ”Kuno

Claims (1)

[Claims] (1) A removal means for removing a blanking period from an input video signal; a field memory for field-delaying the video signal from the removal means and outputting it as a delayed video signal; and a synchronization signal phase-locked to the input video signal. a continuous wave generation circuit that generates a color subcarrier continuous wave phase-locked to the burst signal of the input video signal; and a mixer that adds the synchronization signal and the burst signal to the delayed video signal. A field delay device comprising a circuit.