KR940010237B1 - Apparatus for compensating picture contour for vcr - Google Patents

Abstract

The contour correcting apparatus automatically controls the picture contour by using a remote control. In VCR having a pre-amplifier, a luminance signal processor and a color signal processor, the apparatus includes a picture control signal generator for converting the change of a high frequency state into a control signal automatically and manually, and for controlling the contour correction; and a mixer for mixing output signals and for outputting a composite video signal.

Description

VRC contour correction device

1 is a block diagram of a conventional picture contour correcting apparatus.

2 is a block diagram of a device of the present invention.

3 is a detailed configuration diagram of a picture control signal generator of the present invention.

4 is a waveform diagram according to the present invention.

* Explanation of symbols for main parts of the drawings

10: preamplifier stage 20: luminance signal processing system

21: FM modulation stage 22: Low pass filter stage

23: DM Emphasis stage 24: Noise removing stage

25: picture control stage 30: color signal processing stage

31: high frequency conversion stage 32: band pass filter

33: burst deemphasis stage 34: reproduction noise canceling stage

40: mixer stage 50: picture control signal generator stage

51: A / D converter 52: PWM generator

53: Smoothing device 54: Bystable

55: register 56: adder and subtractor

57,57 ': Moner multi 58: Clock generator

59: divider

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a picture adjusting apparatus for playing a BCial, and more particularly, to an outline correcting apparatus of a BCAL for automatically adjusting a picture outline through a remote controller.

FIG. 1 is a block diagram of a conventional picture adjusting device. As shown therein, a preamplifier stage 10 for ultra-amplifying a signal detected from a video head and only a luminance signal from an output signal of the preamplifier stage 10 are extracted. A luminance signal processing system 20 for signal processing, a color signal processing system 30 for extracting and processing only a color signal from an output signal of the preamplifier stage 10, and the luminance signal processing system 20 And a mixer stage 40 for mixing the output signals of the color signal processing system 30 and outputting a composite video signal. The luminance signal processing system 20 performs FM demodulation on the output signal of the preamplifier stage 10. The FM demodulation stage 21, the low pass filter stage 22 for passing only the low pass component of the signal output from the FM demodulation stage 21, the output signal and the color signal of the low pass filter stage 22, De-emphasis stage 23 to prevent the interference of the, The noise removing stage 24 for removing noise included in the output signal of the emphasis stage 23 and the output signal of the noise removing stage 24 are applied to the video according to the DC conversion value by the variable resistor V _R. The picture control stage 25 adjusts the outline.

In addition, the color signal processing system 30 is a frequency conversion stage 31 for performing a high-frequency conversion of the output signal of the preamplifier stage 10 low-conversion to prevent crosstalk during recording, and the frequency conversion stage A band pass filter stage 32 for extracting only the color signal components from the frequency-converted signal at 31, and an burst up from burst emphasis during recording upon receiving the output signal of the band pass filter stage 32; A burst deemphasis stage 33 for reducing the signal-to-noise ratio (S / N) of the color signal by reducing the signal to the original signal and an output signal of the burst deemphasis stage 33 are inputted to detect the presence or absence of a burst; The reproduction noise canceling stage 34 is configured to block the color signal output at the time of the black active signal and to prevent noise output from the color signal.

Such a device amplifies the preamplifier stage 10 at the preamplifier stage 10 to perform a first-stage amplification of the detection of a video head on which a signal recorded on a magnetic tape is reproduced by the VR signal playback system 20 and the color signal processing system 30. do.

In the luminance signal processing system 20, the amplified signal of the preamplifier stage 10 is demodulated by the FM demodulation stage 21, and the low pass filter stage 22, the preamplifier stage 23, and the noise removing stage 24 at 3KHz are demodulated. ) Is input to the picture control terminal 25 as a video signal, and the contour of the video signal is adjusted according to the DC conversion value by the variable resistor V _R.

In addition, the ultra-amplified signal of the preamplifier stage 10 is subjected to a high frequency conversion through the frequency conversion stage 31 of the color signal processing system 30 and then input to the band pass filter stage 32 to extract only the color signal component.

The burst deemphasis stage 33 then reduces the emulated burst signal to the original color signal during recording, and the reproduction noise canceling stage 34 determines the presence or absence of a burst to block the output of the color signal in the case of a black TV signal, thereby preventing the noise of the color signal. To prevent.

The output of the luminance signal processing system 20 and the output of the color signal processing system 30 are mixed in the mixer stage 40 and output as a composite video signal.

However, when the tape is in good condition, and advantageously for taking advantage of the high-frequency clearly reproducing the picture contours, if bad state of a tape or has one wise to the high reducing properties remove the high frequency noise, in the conventional device, the variable resistance (V _R) There must be a manual operation and operability was also inconvenient.

SUMMARY OF THE INVENTION The present invention provides a contour correction apparatus of V-CAL which is automatically or manually made to adjust the brightness in order to solve the problem, and enables remote control of the automatic and manual brightness adjustment by a remote controller. When described in detail with reference to the drawings as follows.

2 is a block diagram of an outline correction device of the present invention. As shown in FIG. 2, a preamplifier stage 10 for ultra-amplifying a signal detected from a video head and luminance from an output signal of the preamplifier stage 10 are shown. A luminance signal processing system 20 for extracting only a signal and processing a signal, and converts a high frequency (RF) state change of a signal amplified by the preamplifier stage 10 into automatic and manual control signals to automatically and manually convert the signal into the luminance signal processing system. A picture control signal generation stage 50 for controlling the outline correction of the image 20, a color signal processing system 30 for extracting and processing only a color signal from the output signal of the preamplifier stage 10, and the luminance signal processing It consists of a mixer stage 40 for mixing the output signal of the system 20 and the color signal 30 to output a composite video signal, the luminance signal processing unit 20 and the color signal processing unit 30 is configured in the same manner as in the prior art 3rd is seen A detailed configuration diagram of the picture control signal generator 50 according to the present invention includes an A / D converter 51 for converting an RF input signal output from the preamplifier stage 10 into digital, and the A The PWM generator 52 which receives the digital output of the / D converter 51 to generate a pulse, the smoothing device 53 which smoothes the pulse output of the PWM generator 52, and the PWM generator 52 in the automatic mode and A bistable 54 which provides a manual mode selection signal, a register 55 which transmits the data of the A / D converter 51 to the adder and subtractor 56 in the manual mode, a monolith 57, ( 57 ') divides the clock generated by the clock generator 58 and the adder / subtractor 56 which adds or subtracts the output data of the register 55 to the PWM generator 52 in accordance with the up / down pulses. The frequency divider 59 provides a synchronization signal to the device.

The operation and effects of the present invention configured as described above will be described with reference to FIGS. 2 to 4.

As shown in FIG. 2, the signal reproduced by the video head is first amplified by the preamp stage 10 and input to the picture control signal generator 50, the luminance signal processing system 20, and the color signal processing system 30. .

That is, the luminance signal processing system 20 demodulates the ultra-short amplified video signal of the preamplifier stage 10 into the PWM demodulation stage 21 and the low-pass filter stage of 3KHz to avoid interference with the color signal. (22) is passed through the de-emphasis stage (23) to remove noise from the noise removing stage (24) and input to the picture control stage (25).

Accordingly, the picture control stage 25 causes the picture control signal generation stage 50 to be described in detail below to perform contour adjustment by the control output.

In addition, the color signal processing unit 30 is a high frequency conversion of the ultra-amplified signal of the preamplifier stage 10 through the frequency conversion stage 31 and input to the band pass filter stage 32 to extract only the color signal components.

Then, the burst deemphasis stage 33 reduces the burst signal amplified at the time of recording to the original color signal, and the reproduction noise removing stage 34 determines the presence or absence of a burst so as to block the output of the color signal in the case of a black and white TV signal, thereby preventing the noise of the color signal. To prevent.

Therefore, the video signal whose contour is corrected in the picture control stage 25 is mixed by the output of the color signal processor 30 and the mixer stage 40 and output as a composite video signal.

On the other hand, the envelope detection signal output from the preamplifier stage K as the fourth c diagram is input to the A / D converter 51. Prior to this, the output of the clock generator 58 such as the 4d diagram is divided into 1 / n as the 4e diagram in the divider 59 so that the A / D converter 51, the PWM generator 52, the register 55, The clock is supplied to the adder / subtracter 56 as a clock.

Thus, as shown in Figs. 4a and b by the first key of the remote controller, if automatic is selected, the vistable 54 outputs a low level, and if manual is selected, the bilevel is output. If it is set automatically and the output of the vistable 54 is at a low level, the output of the A / D converter 51 is supplied to the PWM generator 52 via the bus line g with the same data as the fourth f degree.

Accordingly, the PWM generator 52 outputs a pulse, smoothes the smoothing device 53, and then supplies the same signal to the picture control terminal 25 with the fourth signal.

Therefore, automatic contour correction is made according to the quality of the tape.

On the other hand, when the first key of the remote controller is changed to manual mode and the second key (up key), which is a manual operation key as shown in Fig. 4i, is operated, data of the PWM generator 52 before the corresponding key operation is added to and subtracted from the register 55. Inputted to (56), and the adder / subtractor 56 is a PWM generator 52 one step increased from the stored data of the register 55 with the same data as the fourth k degree added by one bit by the output of the monomultiple 57. The pulse of appears as the 4g diagram, and when two consecutive key inputs are made, it becomes as A of FIG.

On the other hand, when the third key (down key) is input as in the fourth mode in the manual mode, it is obvious that the PWM duty is changed in the opposite direction to the second key.

Therefore, according to the present invention, the picture control stage is operated by converting the change of the RF state into the DC voltage according to the quality of the tape, so that the optimum picture contour can be automatically obtained through the remote controller or manually operated according to the state of the tape. .

Claims (4)

A preamplifier stage for ultra-amplifying the signal detected from the video head; a luminance signal processing system for extracting and processing only a luminance signal from the signal output from the preamplifier stage; and extracting only a color signal from an output signal of the preamplifier stage. In a V-LC comprising a color signal processing system for signal processing, a change in a high frequency (RF) state of a signal amplified by the preamplifier stage is automatically and manually converted into a control signal to control contour correction of the luminance signal processing system. And a picture control signal generating stage and a mixer stage for mixing the output signals of the luminance signal processing system and the color signal processing system and outputting a composite video signal. The PWM control unit of claim 1, wherein the picture control signal generator comprises an A / D converter configured to digitally convert an RF input signal output from the preamplifier stage, and a PWM to receive a digital output of the A / D converter. And a smoothing unit for smoothing the pulse output of the PWM generating unit, a vistable for providing automatic mode and a manual mode selection signal to the PWM generating unit, and adding / subtracting data to the A / D conversion unit in the manual mode. Each register element is divided by adding and subtracting the transfer unit, the output unit of the register unit according to the up / down pulses of the first and second monomultiply, and adding and subtracting the output data to the PWM generator unit, and the clock generated by the clock generator unit. A V-Cal contour correction device, comprising: a divider which provides a synchronization signal to The apparatus of claim 2, wherein the vistable generates control logic for automatic and manual selection according to the input of the first key of the remote controller. 4. The method according to claim 2 or 3, wherein the first and second monomultis provide the up / down pulses according to the input of the second / third key to the add / subtract part in the manual selection control logic output of the bistable. V-Cell contour correction device.