KR100266430B1 - An output apparatus in according to polarity inputted sync signal for multi-sync monitor - Google Patents

Abstract

PURPOSE: An output apparatus according to polarity input sync signal for a multi-sync monitor is provided to be capable of determining video modes corresponding the polarity of vertical and horizontal synchronous signals as well as realizing output suitable to the determined video mode. CONSTITUTION: A synchronous signal separator(200) separates video signals output from an image signal input part(100). A first integrator(300) integrates the horizontal synchronous signals output from the synchronous signal separator(200). A first comparator(400) compares the integrated signal with a reference voltage. A second integrator(500) integrates the vertical synchronous signals output from the synchronous signal separator(200). A second comparator(600) compares the integrated signal with the reference voltage. An EX-OR gate(G1) receives the output signals of the first comparator(400) and an output part(700). An EX-OR gate(G2) receives the output signals of the second comparator(500) and the output part(700).

Description

Output device according to polarity discrimination of input sync signal in multi-sync monitor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an output device according to polarity discrimination of an input sync signal in a multi-sync monitor, and more particularly, to an apparatus for determining a sync polarity of an input video signal and outputting the same in a video mode.

In general, the multi-sync monitor has a multi-function capable of processing signals of various video modes, but signals belonging to one video mode, that is, video signals having the same horizontal frequency but different number of lines are displayed on the monitor. In this case, since only the horizontal frequency is counted to output the deflection, the vertical size of the video screen is displayed differently due to the difference in the number of lines, which causes inconvenience in viewing.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to separate the horizontal synchronization signal and the vertical synchronization signal of the input video signal, respectively, and output the corresponding output through two integrators and two comparators. On the other hand, a horizontal output and a vertical synchronization output are generated through two EX-OR gates along with the high output generated at the output unit to determine the polarity thereof, thereby providing a constant output for the video mode corresponding to the polarity of the synchronization signal. The present invention provides an output device according to polarity discrimination of an input synchronization signal in a multi-sync monitor.

1 is a block diagram illustrating an output device according to polarity discrimination of an input synchronization signal in a multi-sync monitor according to the present invention.

2 is a flowchart illustrating an output device according to polarity discrimination of an input synchronization signal in a multi-sync monitor of the present invention.

<Description of the code | symbol about the principal part of drawing>

100: video signal input unit 200: synchronization signal separation unit

300: first integrator 400: first comparator

500: second integrator 600: second comparator

700: output part G1, G2: EX-OR gate

Hereinafter will be described in detail with reference to the accompanying drawings the configuration and operation of the embodiment for achieving the above object of the present invention.

1 is a block diagram illustrating an output device according to polarity discrimination of an input synchronization signal in a multi-sync monitor according to the present invention.

Referring to FIG. 1, the present invention provides a video signal input unit 100 for supplying a video signal, a sync signal separation unit 200 for separating a sync signal from a video signal output from the video signal input unit 100, and a video signal input unit 100. A first comparator 300 for receiving and integrating the horizontal synchronization signal output from the synchronization signal separation unit 200 and a first comparator comparing the signal integrated by the first integrator 300 with a set reference voltage; 400,

A second integrator 500 that receives and integrates the vertical synchronization signal output from the synchronization signal separator 200 and a second comparator that compares the signal integrated by the second integrator 500 with a predetermined reference voltage ( 600, an output unit 700 for receiving and outputting a horizontal synchronous signal and a vertical synchronous signal output from the synchronous signal separator 200;

The EX-OR gate G1 outputting the output signals of the first comparator 400 and the output unit 700 as an input, and the output signals of the second comparator 500 and the output unit 700 as inputs. And EX-OR gate G2 for output.

Hereinafter, the operation according to an embodiment of the present invention made as described above will be described in detail.

First, as illustrated in Table 1 below, the image signal input unit 100 receives a video signal having a horizontal frequency but having a different number of lines and outputs a different video signal to the synchronization signal separation unit 200.

Video mode resolution Horizontal frequency (KHz) Vertical frequency (KHz) Horizontal Sync Signal Polarity Vertical Sync Signal Polarity VGA350 640x350 31.5 50/60/70 + ― VGA400 640x400 31.5 50/60/70 ― + VGA480 640x480 31.5 50/60 ― ―

In addition, the sync signal separator 200 separates a sync signal mixed from the supplied video signal and applies a horizontal sync signal to the first integrator 300 and the output unit 700, while the vertical sync signal is applied to the second sync signal. It is applied to the integrator 500 and the drawer unit (1), and the first integrator (300) integrates the horizontal synchronization signal and converts it into a DC signal and outputs it to the first comparator (400).

The first comparator 400 generates a high output pulse indicating negative polarity when the output DC signal of the first integrator 300 is greater than the reference voltage, compared to a preset reference voltage. When the output DC signal is smaller than the reference voltage, a low (L) output pulse indicating polarity is applied to the generated first EX-OR gate G1.

Similarly, the second integrator 500 integrates the vertical synchronization signal output from the synchronization signal separation unit 200, converts the vertical synchronization signal into a DC signal, and outputs the DC signal to the second comparator 600. After comparing the magnitude with the preset reference voltage, and generates a high (H) output pulse and a low (L) output pulse indicating the negative and the positive polarity as described above is applied to the second EX-OR gate (G2). .

On the other hand, the output unit 700 receives the horizontal synchronizing signal and the vertical synchronizing signal together from the synchronizing signal separation unit 200 generates a positive output pulse regardless of the polarity of the synchronizing signal to generate the first EX-OR. Applied to the gate G1 and the second EX-OR gate G2.

Accordingly, the first EX-OR gate G1 is horizontal after combining the high (H) or low (L) output pulse of the first comparator 400 and the positive output pulse of the output unit 700. The second EX-OR gate G2 has a synchronous output and the high (H) or low (L) output pulse of the second comparator 600 and the positive output pulse of the output unit 700. After combining with each other, by outputting a vertical synchronous output, it is determined which video mode the horizontal synchronous signal and the vertical synchronous signal are synchronizing signals, and then the output is made accordingly.

For example, when the output of the first comparator 400 is a high (H) output while the output of the output unit 700 is also a positive (POSITIVE) output, the two high (H) outputs are applied. The first EX-OR gate G1 of the negative horizontal synchronous output comes out, the output of the second comparator 600 is a low (L) output, while the output of the output unit 700 is also high (H) ), The second EX-OR gate (G2) receiving these two outputs outputs a bipolar vertical synchronous output, which is determined as the video mode of the VGA400 as shown in Table 1 above, and the determined mode. Will produce the correct output.

Next, FIG. 2 is a flowchart illustrating an output device according to polarity discrimination of an input synchronization signal in a multi-sync monitor according to the present invention, wherein an image signal input step (S10) and an image signal input step are performed. A synchronization signal separation step (S20) in which the synchronization signal is separated from the image signal output through S10, and a first integration step (S30) in which the horizontal synchronization signal separated through the synchronization signal separation step (S20) is integrated; A first comparison discrimination step (S40) in which the signal integrated in the first integration step (S30) is compared with the reference voltage;

A second integration step S50 in which the vertical synchronization signal separated through the synchronization signal separation step S20 is integrated, and a second comparison discrimination in which the signal integrated in the second integration step S50 is compared with a reference voltage; Output step (S70) and the output signal (S70) is outputted through the combination of the two EX-OR gates (2) and the discrimination signal discriminated in the first comparison determination step (S40) and the second comparison determination step (S60), respectively. )Wow,

If the comparison with the reference voltage is not performed in the first comparison determination step (S40), the first integration step (S30) and the second comparison determination step (S60) in which the integration process of the horizontal synchronization signal is repeatedly performed. When the comparison with the reference voltage is not performed, the integration process of the vertical synchronization signal is repeatedly performed, and the second integration step S50 is performed.

Hereinafter, an operation after the synchronization signal separation step S20 will be described with reference to the accompanying drawings.

First, the horizontal synchronization signal separated by the synchronization signal separation unit 200 is applied to the first integrator 300 and the output unit 700, while the vertical synchronization signal is the second integrator 500 and the output unit 700. And the first integrator 300 and the second integrator 500 integrate the supplied horizontal synchronizing signal and the vertical synchronizing signal into DC signals, respectively, and then convert the first comparator 400 and the second comparator ( 600).

In addition, the first comparator 400 and the second comparator 600 compare the voltage of the integrated DC signal with a preset reference voltage and output a high (H) or low (L) output according to the magnitude of the first EX. And output to the -OR gate G1 and the second EX-OR gate G2, respectively.

On the other hand, the output unit 700 receives the horizontal synchronizing signal and the vertical synchronizing signal together from the synchronizing signal separation unit 200 and outputs a high (H) output irrespective of the polarity thereof to the first EX-OR gate G1. ) And the second EX-OR gate G2, respectively.

Accordingly, the first EX-OR gate G1 and the second EX-OR gate G2 are output from the first comparator 400 and the output unit 700 and the outputs of the second comparator 600 and the output unit 700. By synthesizing and outputting the horizontal synchronous output and the vertical synchronous output according to the truth table, it is possible to determine which video signal is the horizontal synchronous signal and the vertical synchronous signal.

As described above, the present invention converts the horizontal synchronizing signal and the vertical synchronizing signal separated by the synchronizing signal separating unit into DC signals by two integrators respectively applied thereto, and the preset reference is set through the two comparators applied respectively. Compared to the voltage, a high or low output is generated according to the magnitude, while the horizontal and vertical synchronization signals are input to two EX-OR gates, respectively, such as the high output of the output unit. By generating the horizontal synchronous output and the vertical synchronous output by the combined output of the EX-OR gates, the video mode corresponding to the polarity of the horizontal synchronous signal and the vertical synchronous signal is determined, and the output corresponding to the video mode is achieved. There is.

Claims (3)

In the multi-sync monitor for determining the synchronization polarity of the input video signal and outputs according to the video mode, Synchronizing signal separating means for separating the horizontal synchronizing signal and the vertical synchronizing signal from the video signal; Output means for receiving a high level output regardless of its polarity by receiving a horizontal synchronizing signal and a vertical synchronizing signal from the synchronizing signal separating means; Horizontal synchronous polarity output means for receiving a high output from said output means and outputting the polarity of the horizontal synchronous signal, and And a vertical synchronous polarity output means for receiving the high output from the output means and outputting the polarity of the vertical synchronous signal. The output control apparatus according to the polarity of the input synchronous signal in the multi-sync monitor. [2] The horizontal synchronous polarity output means of claim 1, wherein the horizontal synchronous polarity output means integrates a horizontal synchronous signal applied to the synchronous signal separation means and converts the DC synchronous signal into a DC signal and the DC output of the first integrator 300. Is compared with a preset reference voltage, and according to the magnitude relationship, the first comparator 400 outputting the high (H) or the low (L) output and the first EX- supplied with the output of the first comparator 400. Output control device according to the polarity of the input synchronization signal in the multi-sync monitor, characterized in that consisting of the OR gate (G1). The method of claim 1, wherein the vertical synchronous polarity output means is a second integrator (500) for integrating the vertical synchronous signal applied to the synchronous signal separation means converted into a DC signal, and the DC output of the second integrator (500) Is compared with a preset reference voltage, and according to the magnitude relationship, the second comparator 600 outputting the high (H) or the low (L) output and the second EX- receiving the output of the second comparator 600 are supplied. Output control device according to the polarity of the input synchronization signal in the multi-sync monitor, characterized in that consisting of the OR gate (G2).

Images