KR970002189B1 - An automatic color adjusting device of image record/reproduction machine - Google Patents

Abstract

An apparatus for automatically controlling a color at an image recording replaying system is disclosed. The system includes a controller for controlling the intensity of color of a composite video signal according to the level set by a watcher, and an image signal processing unit for processing the image signal. The apparatus comprises a switching unit(10) for outputting a color burst signal of the inputted composite image signal according to a burst gage pulse; an amplification and a filtering unit(20) for amplifying and filtering the output color burst signal from the switching unit(10); a comparator(30) for comparing the level of the output signal from the amplification and a filtering unit(20) to a reference voltage; and a level controller(40) for controlling a color control level provided from the controller(50) to the image signal processing unit(60) according to the data from the comparator(30).

Description

Automatic Color Control of Video Recorder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color adjusting device of an image recording player, and more particularly, to an automatic color adjusting device of an image recording player which adjusts a color gain so as to have a constant color level even when the level of an input composite video signal is different. will be.

The color adjusting device of the conventional video recorder is constructed as shown in FIG.

The controller 1 shown in FIG. 1 adjusts the color density of the composite video signal supplied to the video recorder according to the level set by the viewer, thereby controlling the image processor through the resistors R1 to R3 and the condenser 1. 2) to be supplied.

Therefore, when the level of the composite video signal supplied to the video recorder is high, the viewer must manually lower the setting level. On the contrary, when the level of the composite video signal is low, the viewer needs to raise the setting level.

Accordingly, an object of the present invention is to provide an automatic color adjusting device of an image recording player which detects a level of a composite image signal input to an image recording player and automatically adjusts color gain.

In order to achieve the above object, the apparatus for automatically adjusting color of a video recording and reproducing apparatus according to the present invention comprises: a synchronization separating unit for separating and outputting a horizontal synchronizing signal from a composite video signal input through an input terminal (IN) of the video recording and reproducing apparatus And a delay unit for delaying and outputting the horizontal synchronization signal provided separately from the synchronization separation unit by a time difference between the horizontal synchronization signal constituting the composite video signal and a color burst signal, and being delayed in the delay unit. A gate pulse generator for generating a burst gate pulse (BGP) according to the horizontal synchronization signal provided, and a switching for outputting only a color burst signal among the composite image signals switched and input by the burst gate pulse provided from the gate pulse generator And amplify, filter, and output the color burst signal output from the switching unit. And amplifying and filter unit, characterized in that the output from the controller in accordance with the data output from the comparison unit consisting of parts of the level control for controlling a color level of control to be supplied to the image signal processor.

1 is a circuit diagram showing a color adjusting device of a conventional video recording and reproducing apparatus.

2 is an exemplary view of a color adjusting device according to the present invention.

* Explanation of symbols for main parts of the drawings

3: synchronous separation section 5: delay section

7: gate pulse generator 10: switching unit

20: amplification and filter unit 30: comparison unit

40: level adjuster 50: controller

60: video signal processor

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an exemplary view of an automatic color adjustment device according to the present invention.

In FIG. 2, the switching unit 10 is configured to switch the composite image signal input through the input terminal IN according to the burst gate pulse BGP to output only a color burst signal. ) Is configured to amplify the color burst signal output from the switching unit 10 and then convert the output into DC.

In addition, the sync separator 3 separates the horizontal sync signal from the input composite video signal, and the delay unit 5 outputs the horizontal sync signal separated by the sync separator 3 by a predetermined time delay. The gate pulse generator 7 is configured to provide the burst gate pulse to the switching unit 10 in synchronization with the time delayed horizontal synchronizing signal provided from the delay unit 5.

The comparator 30 is configured as a comparator COMP1 and COMP2 to compare the DC voltage output from the amplification and filter unit 20 with different reference voltages Vref1 and Vref2 which are set, respectively, and output the result. It is.

The level adjuster 40 operates according to the data output from the comparators COMP1 and COMP2 of the comparator 30 to adjust the color control level output from the controller 50 and supplied to the image signal processor 60. The transistors Q1 and Q2 and the voltage distribution are composed of resistors.

Referring to the operating relationship of the present invention having the configuration as described above as follows.

The composite video signal provided through the input terminal IN of the VCR, which is a video recording / reproducing device employing the color automatic control device shown in FIG. 2, is provided with a synchronization separating section 3, a switching section 10, and a video signal processing section 60. Are each provided.

The composite video signal input to the video signal processor 60 is processed as a video signal as is well known in the art.

Meanwhile, according to the present invention, the synchronizing separator 3 separates the horizontal synchronizing signal from the input composite video signal, that is, detects only the horizontal synchronizing signal from the composite video signal and provides it to the delay unit 5, and the delay unit. (5) delays the input horizontal synchronization signal by the time difference between the horizontal synchronization signal and the color burst signal, and outputs the same to the gate pulse generator 7.

In addition, the gate pulse generator 7 generates a burst gate pulse to the switching unit 10 in synchronization with the time delayed horizontal synchronizing signal provided from the delay unit 5.

Accordingly, the switching unit 10 is switched according to the burst gate pulse output from the gate pulse generator 7 and connected to the input terminal IN, and at the same time, the burst gate pulse provided from the gate pulse generator 7 is provided. Since the high state is maintained only in the composite image signal and the color burst signal period, the switching unit 10 outputs only the color burst signal synchronized with the burst gate pulse among the composite image signal to the amplification and filter unit 20.

In other words, the delay unit 5 delays the horizontal synchronization signal detected and provided from the composite video signal by the synchronization separator 3 to the gate pulse generator 7 by delaying the correction time, and outputs the gate pulse generator ( 7) applies a gate pulse to the switching unit 10 to be synchronized with the color burst signal included in the composite video signal according to the horizontal synchronization signal provided by the delay unit 5, the switching unit 10 accordingly Only the color burst signal synchronized with the gate pulse provided from the gate pulse generator 7 is output from the composite image signal switched to the input terminal of the VCR to the amplification and filter unit 20.

Thereafter, the color burst signal detected and output by the switching unit 10 is low-pass filtered by the amplifying and filtering unit 20 and converted into a DC voltage according to the color level, and then the comparator COMP1 of the comparator 30 (COMP2). ) Compared with the different reference voltages Vref1 and Vref2 respectively supplied to the non-inverting terminal + and applied to the inverting terminal-, the result is output.

For example, when the DC voltage output from the amplifier and filter unit 20 is greater than or equal to the reference voltage Vref1, the output of the comparator COMP1 becomes high and the transistor Q1 of the level adjuster 40 is turned on. Therefore, since the voltage drop occurs by the resistor R10 connected to the collector terminal of the transistor Q1, the color control level output from the controller 50 and supplied to the image signal processor 60 is reduced. In other words, if the color burst level is large, the color control level is reduced.

On the other hand, if the DC voltage output from the amplifying and filtering unit 20 is less than the reference voltage Vref2, the output of the comparator COMP2 of the comparator 30 goes low, so that the transistor Q2 of the level adjusting unit 40 Since the voltage drop does not occur (voltage drop by the resistor R7), the color control level output from the controller 50 and supplied to the image signal processing unit 60 increases.

According to the present invention operating as described above, there is an effect of automatically adjusting the color by correcting the color control level supplied to the video signal processing unit according to the color burst level of the composite video signal input to the video recording and reproducing apparatus.

Claims (3)

In the video recording player comprising a controller 50 for adjusting the color density of the composite video signal according to the level set by the viewer, and an image processing unit 60 for signal processing the video signal, the input terminal of the video recording player ( A synchronization separator 3 for separating and outputting a horizontal synchronization signal from the composite video signal inputted through IN); A delay unit 5 for delaying and outputting the horizontal synchronization signal provided separately from the synchronization separation unit 3 by a time difference between the horizontal synchronization signal constituting the composite video signal and a color burst signal; A gate pulse generator (7) for generating a burst gate pulse (BGP) in accordance with a horizontal synchronization signal provided with a time delay from the delay unit (5); A switching unit (10) for outputting only a color burst signal among the composite image signals which are switched and input by a burst gate pulse provided from the gate pulse generator (7); An amplifying and filtering unit 20 for amplifying, filtering and outputting the color burst signal output from the switching unit 10; A comparator 30 for comparing the signal level output from the amplification and filter unit 20 with different reference voltages; According to the data output from the comparator 30 is output from the controller 50, the level control unit 40 for controlling the color control level supplied to the image signal processing unit 60, characterized in that Collar auto adjuster. The comparator 30 of claim 1, wherein the comparator 30 compares the DC voltages output from the amplification and filter unit 20 with different reference voltages, respectively, and outputs the resultant values. Color automatic adjustment device of a video recorder, characterized in that consisting of. According to claim 1, wherein the level adjuster 40 is operated according to the data output from the comparator 30 to adjust the color control level output from the controller 50 and supplied to the image signal processor 60 And a plurality of transistors (Q1, Q2) and a plurality of voltage distribution resistors.