KR19990038779A - Horizontal Sync Signal Detection Device of HD Monitor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to high definition television (HDTV), and more particularly, to an apparatus for detecting a horizontal synchronous signal of an HD monitor that detects only a pure horizontal synchronous signal from a mixed synchronous signal of a video input signal. In order to detect a purely horizontal synchronizing signal so that a video signal can be deflected smoothly with an HD monitor, two first and second single-stable multivibrators are provided in the synchronization signal detection unit. Further, in the present invention, the first monostable multivibrator outputs a pulse having a width greater than 1 / 2H and less than 1H as a time constant of R ₁ C ₁ , and the second monostable multivibrator is the first monostable multivibrator. The pure horizontal synchronous signal is detected by adjusting the time constant of R ₂ C ₂ to be output only by the horizontal synchronous pulse width. Therefore, when the conventional horizontal synchronizing signal output is a complex synchronizing signal, there was a problem that the horizontal deflection device cannot be used in the HD monitor, but the present invention has an effect of performing a desired deflection operation by detecting a pure horizontal synchronizing signal. .

Description

Horizontal Sync Signal Detection Device of HD Monitor

According to the present invention, in a high definition television (HDTV), a synchronization signal is mixed for smooth operation of the deflection side when a synchronization signal is detected from a video input signal and a horizontal and vertical signal is output to a deflection end of the monitor. The detecing apparatus of horizontal synchronous signal for HD monitor to output only the pure horizontal synchronous signal from the horizontal synchronous signal output from the.

HD TV has 1125 lines of scan line and 16: 9 aspect ratio, which is 25% longer than current TVs, and the number of pixels per frame is about 5 times that of detailed images that are reproduced so that image quality does not deteriorate even when viewed on a large screen. . HD television broadcasting needs to compress bands to transmit Y signals (22MHz) and C signals (RY: 7MHz, BY: 7MHz) in the satellite channel band (27MHz) when using broadcast satellites. have.

1 is a block diagram of a horizontal deflection circuit for a typical television.

The horizontal circuit is connected to the differential circuit (1) section and the differential circuit (1) section that separates only the horizontal synchronous signal, and the oscillation output 15750 kV from the horizontal synchronous signal and the horizontal output circuit applied from the differential circuit (1) section. Is connected to the horizontal AFC (2) section and the horizontal AFC (2) section to obtain the AFC control voltage detected according to the phase difference, and the phase of the horizontal oscillation frequency of the signal applied from the horizontal AFC (2) section is synchronized. The horizontal oscillation (3), which is equal to the horizontal oscillation (3), the horizontal excitation (4) to amplify the pulse voltage of 15750 kHz output from the horizontal oscillation (3), the horizontal excitation (4) is connected to the horizontal excitation ( 4) The horizontal output seat is connected to the horizontal output section 5 and the horizontal output section 5 by which a large sawtooth current is applied to the horizontal deflection coil by switching operation by the pulse voltage applied from the section. Three electron beams gathered from the shadow mascara It is connected to the converging 11 part and the horizontal output 5 part to lock, and the DC deflection coil is applied to the horizontal deflection coil so as to move to the left and right sides of the raster to move the center properly. Horizontal position adjustment (6) and left and right distortion correction (7) to prevent the raster, and high pressure control (8) and high pressure rectification (9) to supply the DC high pressure required by the anode of the water pipe. It is composed.

Referring to the conventional horizontal deflection circuit configured as described above, the differential circuit (1) portion serves to select only the horizontal synchronous signal from the mixed synchronous signal applied, the horizontal synchronous signal is 15734.26 kHz during the color image. The horizontal synchronizing signal applied from the differential circuit 1 part is automatically adjusted to be equal to the phase of the horizontal oscillation frequency in the horizontal AFC 2 part, and connected to the horizontal AFC 2 part, horizontal oscillation 3 The unit oscillates to 15750 있도록 to generate a pulse voltage of 15 750 있도록 so that horizontal scanning can be continued even when there is no horizontal synchronous signal, and the horizontal excitation (4) part connected to the horizontal oscillation (3) part is horizontal oscillation. Amplify the voltage of pulse wave generated in (3), make the waveform even and drive the horizontal output terminal. The horizontal output (5) part connected to the horizontal excitation (4) part transmits a suitable sawtooth current to a horizontal deflection coil, and the high pressure control (8) part and the high pressure control (8) part connected to the horizontal output (5) part. The high voltage rectifier 9 connected to the booster step-ups the pulse voltage generated in the horizontal return period in the horizontal output section 5, rectifies and supplies the DC high voltage required by the anode of the water pipe. Convergence 11 connected to the horizontal output section 5 transforms a part of the horizontal and vertical output into appropriate waveforms, and then flows through the converence coil attached to the water pipe to always concentrate three electron beams. Let's do it. In addition, the horizontal position adjustment (6) portion connected to the horizontal output (5) portion by applying a DC current to the horizontal deflection coil to properly move the position of the raster to the left and right to hold the center, the horizontal position adjustment (6) portion The left and right distortion correction (7) portion connected to the do not become a failure type raster.

On the other hand, since the horizontal deflection circuit configured as described above is designed to be operable in a general television system, there is a problem that the horizontal deflection circuit of the HDTV monitor cannot be used. If it is applied as a synchronous signal and a vertical synchronous signal, the output is also divided into a horizontal synchronous signal and a vertical synchronous signal, and when the composite synchronous signal is input, the horizontal synchronous signal is also a composite synchronous signal. When the synchronization signal is a SOG (Synchronous On Green) signal, the output of the horizontal synchronization signal is a composite synchronization signal. Therefore, when the horizontal synchronous signal output is a composite synchronous signal, the video mode recognition is changed during the vertical synchronous period, and thus there is a problem that the deflection operation is not desired and the TV horizontal deflection device cannot be used as the horizontal deflection position of the HDTV monitor.

Accordingly, the present invention has been made to solve the conventional problems as described above, the object of the present invention is to detect the synchronization signal from the video input signal and output the horizontal synchronization signal and vertical synchronization signal to the deflection side of the deflection side The present invention provides a horizontal synchronous signal output device of an HD monitor that detects and outputs only a pure horizontal synchronous signal which is not mixed with the horizontal synchronous output signal for a smooth operation.

1 is a block diagram showing a schematic configuration of a general HDTV receiving system

2 is a block diagram of an HDTV system according to the present invention.

3 is a waveform diagram illustrating an input signal and a horizontal synchronous output pulse of the HD video of FIG.

4 is a detailed view of the horizontal synchronous detection unit shown in FIG.

5 is a waveform diagram of the output of Q ₁ and Q _{2 shown} in FIG.

<Description of Symbols for Main Parts of Drawings>

20: antenna 30: HDTV tuner

40: demodulation part 50: filter part

60: channel compensator 70: error correction

80: decoding unit 90: display processing unit

100: HD monitor 110: Sync signal detection unit

120: sync signal separator 130: vertical sync detector

140: horizontal synchronous detection unit 150: vertical output unit

160: horizontal output unit 200: HD video signal

210: horizontal synchronous output pulse 220: first monostable multivibrator

230: second monostable multivibrator

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

2 is a block diagram showing a general configuration of an HDTV system. Horizontal synchronization signal output device of the HD monitor includes an antenna (10) for receiving an HDTV signal; A tuned HDTV connected to the HDTV tuner 20 and the HDTV tuner 20 that tune only a signal of a channel desired by the user among the HDTV signals received through the antenna 10 and applied from the HD tuner 20. An intermediate frequency detector 30 detecting an HDTV intermediate frequency signal from the signal; An A / D converter 40 connected to the intermediate frequency detector 30 for converting an HDTV intermediate frequency signal applied from the intermediate frequency detector 30 into a digital signal; A filter unit 50 connected to the A / D converter 40 to remove NTSC interference signals from the HDTV signal of the converted digital signal applied from the A / D converter 40; A channel compensator (60) connected to the filter unit (50) for compensating for linear channel distortion from the HDTV signal applied from the filter unit (50); An error correction unit (70) connected to the channel compensator (60), for comparing an HDTV signal applied from the channel compensator (60) with a pre-stored reference HDTV signal type, and correcting an error according to the result; The original HDTVI color signal, the HDTVQ color signal, the HDTVQ color signal, and the HDTV luminance signal are decoded from the compressed HDTV signal by decoding the error corrected HDTV signal applied from the error correction unit 70. A decoding unit 80 to obtain; Connected to the decoding unit 80, the raw signals of the HDTV applied from the decoding unit 80 are processed by the de-gamma method, and the red, green, and green signals of the HDTV are displayed. A display processing unit 90 for obtaining a signal Blue;

A synchronization signal detection unit 110 connected to the intermediate frequency detection unit 30 and detecting a synchronization signal from an output signal of the intermediate frequency detection unit 30; A synchronization signal separation unit 110 connected to the synchronization signal detection unit 110 and separating a horizontal synchronization signal and a vertical synchronization signal from the synchronization signal applied from the synchronization signal detection unit 110; A vertical synchronous detection unit 130 connected to the synchronous signal separation unit 110 and detecting only a vertical synchronous signal from the synchronous signal output from the synchronous signal separation unit 110; A horizontal synchronous detection unit 140 connected to the synchronous signal separator 120 to detect only a horizontal synchronous signal from the synchronous signal output from the synchronous signal separator 120; A vertical output unit 150 connected to the vertical synchronous detection unit 130 to apply a proper signal to the vertical deflection coil so as to achieve a desired vertical deflection; R / G / B which is connected to the horizontal synchronous detection unit 140 and is applied from the horizontal output unit 150 and the display processing unit 90 to apply a proper signal to the horizontal deflection coil so as to achieve a desired horizontal deflection. The HD monitor 100 is configured to display a video signal by deflecting the color signal by the signals applied from the vertical output unit 150 and the horizontal output unit 160.

Referring to the configuration of the general HDTV system of FIG. 2 as follows.

When the high frequency signal of the HDTV is received through the antenna 10, the HDTV tuner 20 tunes only the HDTV signal of a channel desired by the user, and the demodulator 40 connected to the HDTV tuner 30 is a baseband level. Demodulated to state In addition, the HDTV signal demodulated through the demodulator 40 is removed from the NTSC interference signal by the filter unit 50 connected to the demodulator 40, and the channel compensator connected to the filter unit 50 ( 60, linear channel distortions, such as tilt and ghost, are compensated for and output to the error correction unit 70. The error correction unit 70 is pre-compensated with the HDTV signal type compensated above. The stored reference HDTV signal types are compared and the error corrected accordingly. The compressed HDTV signal corrected and output from the error correction unit 70 is applied to the decoding unit 80 connected to the error correction unit 70 to restore the original HDTV luminance signal and color signal, and the decoding unit The display processing unit 90 connected to 80 obtains the green signal G and the blue signal B of the red signal R by processing the degamma method so that the signals recovered by the decoding unit 80 can be displayed. . In the synchronization signal detection according to the present invention, the synchronization signal detection unit 110 detects the synchronization signal from the signal output from the HDTV tuner unit 30, and the vertical synchronization detection unit 130 and the horizontal synchronization are detected from the detected synchronization signal. The detection unit 140 detects the vertical synchronization signal and the horizontal synchronization signal. In addition, the vertical output unit 150 and the horizontal output unit 160 detect the vertical synchronizing signal and the horizontal synchronizing signal from the vertical synchronizing unit 130 and the horizontal synchronizing unit 140 so that the video signal can be smoothly transmitted to the HD monitor 100. Apply a signal so that it can be displayed.

In the block diagram shown in FIG. 2, when an input signal of a video image signal is input as a Composite Synchronous and a Synchronous On Green (SOG) signal, most of the output signals from the synchronous signal separation unit are in the horizontal synchronous signal output. The equalization pulses during the vertical synchronization signal period become the same as the horizontal synchronous output pulse 210 signal of FIG. 2. FIG. 3 is a waveform diagram showing an HD video signal and a horizontal synchronous output pulse.

In general, there is a horizontal synchronization signal and a vertical synchronization signal in the synchronization signal, and an equalization pulse exists in the vertical synchronization signal period. Equalization pulse is a pulse having 1/2 period of horizontal synchronization signal and inserted before and after vertical synchronization signal to receive interlaced video signal. As a result, the synchronization start levels of the odd field and the even field are almost the same, so that interlaced scanning is performed well, and the synchronization of the first portion of the screen is not scattered and stable.

In the HD video signal 200 of FIG. 3, the reference numeral 200a in the vertical synchronizing section 5H denotes 1H, and the horizontal synchronizing output pulse of 1 / 2H is referred to as the reference numeral 210a in the vertical synchronizing section of the 1H 200a. In other words, the horizontal synchronization signal is generated in a 1 / 2H period. In the multi-sync monitor, all the deflection control signals are generated using the frequency. As shown in FIG. 3, since the horizontal synchronization signal of 1 / 2H exists in the vertical synchronization period, the mode is changed during this period. Two monostable multivibrators are used to produce one horizontal synchronization signal during the same 1H vertical synchronization period.

4 according to the present invention is a block diagram configured in detail with respect to the horizontal synchronous detection unit 140 in the block diagram of FIG.

The horizontal synchronous detection unit 140 shown in FIG. 4 includes a first capacitor C ₁ , a second capacitor C ₂ , a first resistor R ₁ , a second resistor R ₂ , and a first monostable multivibrator. And a second monostable multivibrator 230.

The first monostable multivibrator 220 inputs the horizontal synchronous output pulse 210 shown in FIG. 3 to one end and applies a voltage Vcc to the other end. In addition, the second monostable multivibrator 230 inputs a signal output from _one end Q ₁ of the first monostable multivibrator 220 to an A input terminal, and a first monostable multivibrator 220 to the other end B. Apply the voltage (Vcc) as In addition, the first monostable multivibrator 220 connects the first capacitor C ₁ and the first resistor R ₁ in parallel between the Vcc voltage and the ground, and the second monostable multivibrator 230 also has a Vcc voltage. The second capacitor C ₂ and the second resistor R ₂ are connected in parallel between the ground and the ground. Accordingly, the first monostable multivibrator 220 is formed by the R ₁ C ₁ time constants of the first capacitor C ₁ and the first resistor R _{1 that} are applied to the first monostable multivibrator 220. A circuit for outputting a pulse with a predetermined width by triggering a positive edge of a pulse from an H-synchronous output signal input to one end, wherein the R of the first capacitor C ₁ and the first resistor R ₁ are output. _{The 1} C ₁ time constant outputs a pulse of width greater than 1 / 2H and less than 1H. The second monostable multivibrator 230 adjusts the R ₂ C ₂ time constants of the second capacitor C ₂ and the second resistor R ₂ to be output only by the horizontal synchronous pulse width. Therefore, pure horizontal synchronous output pulses can be obtained using the two monostable multivibrators 220 and 230 as described above.

Figure 5 is the output signal (Q ₂₎ of the corrugation help the second monostable multivibrator 230 to the output signal (Q ₁₎ of the first monostable multivibrator 220 from the horizontal synchronizing output device shown in FIG. 4 The waveform diagram is shown.

Referring to FIG. 5, reference numeral 210 denotes a horizontal synchronous output pulse shown in FIG. Q ₁ 240, which is an output signal of the first monostable multivibrator 220, applies the horizontal synchronous output pulse 210 to the first monostable multivibrator 220 to adjust the time constant of R ₁ C ₁ . Is a waveform diagram showing a pulse having a width greater than 1 / 2H and smaller than 1H, and Q ₂ 250, which is an output signal of the second monostable multivibrator 230, is an output signal of the first monostable multivibrator 220. Q ₁ 240 is applied to the second monostable multivibrator 230 to adjust the time constant of R ₂ C _{2 to show} the width of the horizontal synchronous pulse width. Therefore, Q ₂ 150 is a waveform diagram of detecting only a pure horizontal synchronization signal.

As described above, the present invention includes a first monostable multivibrator 220 and a second monostable multivibrator 230 to apply an H synchronous output signal of a video signal to the first monostable multivibrator 220. In addition, the output signal of the first monostable multivibrator 220 is applied to the second monostable multivibrator 230, by using the first capacitor and the first resistor of the first monostable multivibrator 220. The pulse width is controlled by adjusting the R ₁ C ₁ time constant, and the pulse width is controlled by adjusting the R ₂ C ₂ time constant using the second capacitor and the second resistor of the second monostable multivibrator 230. There is an effect of detecting only the horizontal synchronization signal.

Claims (2)

A HD monitor comprising a sync signal detector 110, a sync signal separator 120, a horizontal sync detector 140, and a horizontal output unit 160 for deflecting and displaying a video signal of an HDTV transmitted from a broadcasting station on a HD monitor. In the horizontal synchronous signal detection device, The horizontal synchronous detection unit 140 applies a horizontal synchronous output pulse 210 of the HD video signal to output a pulse of a width larger than 1 / 2H and less than 1H 220; And a first monostable multivibrator (220) for receiving the output signal of the first monostable multivibrator (220) and outputting only the horizontal synchronization pulse width. According to claim 1, wherein the first monostable multi-vibrator 220 is a first capacitor (C ₁ ) and the first resistor (R ₁ ) is connected in parallel, by adjusting the time constant of the R ₁ C ₁ A pulse having a width larger than 1 / 2H and smaller than 1H may be output, and the second monostable multivibrator 230 has a second capacitor C ₂ and a second resistor R ₂ connected in parallel to each other. The horizontal synchronous signal detection device of the HD monitor, characterized in that by adjusting the time constant of ₂ C ₂ to be a pure horizontal synchronous output pulse 250 as much as the horizontal synchronous pulse width.