KR100222839B1 - Sync-signal inspecting device of tv - Google Patents

Abstract

The present invention relates to an apparatus for inspecting a horizontal / vertical synchronous signal of a television.

In the apparatus for checking a synchronous signal of a television according to the present invention, a horizontal / vertical synchronous signal using a horizontal / vertical deflection yoke signal based on the horizontal / vertical synchronous signal of the television is used. By automatically checking the test command, the test results of the synchronization signal are immediately output to the computer monitor, which makes the test task simpler and the test results are more reliable.

Description

Synchronous signal inspection device of TV

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a device for inspecting a horizontal / vertical synchronization signal of a television, and in particular, a horizontal / vertical deflection yoke signal based on a horizontal / vertical synchronizing signal of a television. The present invention relates to an apparatus for inspecting synchronization signals of a television for automatically inspecting horizontal / vertical synchronization signals by using.

In general, a printed circuit board (PCB) for processing an image signal in a television is manufactured according to a design, and then the printed circuit board performs the operation in the step of producing the television by installing the printed circuit board normally inside the television. There is a process of checking whether the signal is present. Among the signal items to be checked, a check on the synchronization signal is necessarily accompanied.

FIG. 1 is a diagram for explaining a conventional method for checking a synchronous signal of a television. Referring to FIG. 1, a conventional printed circuit board (PCB) (1) for providing a synchronous signal of a television is provided in order to inspect the synchronous signal of a television. After the CRT 2 was connected, the inspector visually inspected the synchronization signal displayed on the CRT.

Such a conventional method has an inconvenience and troublesome problem of having to perform inspection by replacing with a CRT corresponding to this printed circuit board whenever a PCB type such as 20 inches or 25 inches is changed. Also, the synchronization signal displayed on the CRT Because it depends only on visual inspection, there was a problem that could not be accurate inspection.

The present invention has been made to solve the above problems and to achieve an improvement.

Accordingly, an object of the present invention is to automatically check the horizontal / vertical synchronization signal using a horizontal / vertical deflection yoke signal based on the horizontal / vertical synchronizing signal of the television. By doing so, it is possible to easily perform a synchronous signal inspection operation, and relates to a synchronous signal inspection apparatus for a television capable of obtaining accurate inspection results.

As a technical means for achieving the above object of the present invention, the synchronization signal inspection apparatus of the television of the present invention outputs the inspection start signal to the clock generator to instruct the inspection start, the synchronization signal in accordance with the signal through the low pass filter unit A computer outputting a test result for the; A clock signal generator for outputting a clock signal by the test start signal of the computer; A deflection signal level adjusting unit for adjusting the horizontal / vertical deflection signals from the inspection target printed circuit board to the magnitude level required by the next circuit block; A horizontal / vertical synchronous signal generator for processing horizontal / vertical deflection signals scaled by the deflection signal level controller by the clock signal of the clock signal generator and outputting horizontal / vertical synchronous signals, respectively; A reset unit for outputting a reset signal by performing an AND operation on the horizontal synchronization signal of the horizontal / vertical synchronization signal generator and the clock signal of the clock signal generator; A reference synchronous signal generator for starting by the reset signal of the reset unit and outputting a reference synchronous signal corresponding to the clock signal of the clock signal generator; A differential amplifier for differentially amplifying the reference sync signal of the reference sync signal generator and the sync signal of the horizontal / vertical sync signal generator, differentially amplifying two horizontal sync signals, and differentially amplifying two vertical sync signals; And a low pass filter unit for changing the output signal of the differential amplifier unit to a DC level and providing the same to the computer.

1 is a diagram for explaining a method of checking a synchronization signal of a conventional television.

2 is a block diagram of a synchronization signal inspection apparatus for a television according to the present invention,

3 is a timing chart showing output waveforms for the main block of the inspection apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

10: computer 11: PC interface unit

13: control unit 15: monitor

20: clock signal generator 22: burst synchronization generator

24: frequency multiplier 26: square wave part

30: deflection signal level control unit 31a, 31b: horizontal / vertical attenuator

33a, 33b: horizontal / vertical amplification part 40: horizontal / vertical synchronous signal generating part

50: reset section 60: reference synchronization signal generator

70: differential amplifier 80: low pass filter

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a synchronizing signal inspection apparatus for a television according to the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a block diagram of the apparatus for inspecting a synchronous signal of a television according to the present invention. Referring to FIG. 2, the apparatus for inspecting a synchronous signal of a television according to the present invention sends an inspection start signal SST to the clock generator 20. As shown in FIG. A computer 10 for outputting a command to start a test and outputting a test result for a synchronization signal according to a signal through the low pass filter unit 80, and a test start signal SST of the computer 10. A deflection signal that adjusts the clock signal generator 20 for outputting the clock signal SCLK and the magnitude level required by the next circuit block for each of the horizontal and vertical deflection signals SHDY / SVDY from the test target printed circuit board. The horizontal / vertical synchronous signal is processed by processing the horizontal / vertical deflection signal scaled by the deflection signal level control unit 30 by the level controller 30 and the clock signal SCLK of the clock signal generator 20. Horizontal / vertical synchronous signal generator (SHS) (SVS) 40 and a horizontal logic signal multiplied by the horizontal synchronous signal SHS of the horizontal / vertical synchronous signal generator 40 and the clock signal SCLK of the clock signal generator 20 to output the reset signal SRT. Start by the set unit 50 and the reset signal SRT of the reset unit 50, and the reference synchronization signal SHR (SVR) corresponding to the clock signal SCLK of the clock signal generation unit 20. A reference synchronous signal generator 60 for outputting the synchronous signal, a reference synchronous signal SHR (SVR) of the reference synchronous signal generator 60, and a synchronization signal SHS of the horizontal / vertical synchronous signal generator 40. (SVS) is a differential amplification, differentially amplifying the two horizontal synchronization signal (SHR) (SHS), the low-pass to provide the computer 10 by changing the output signal of the differential amplifier 70 to the DC level It consists of the filter part 80.

The computer 10 provides a test start signal to the clock generation unit 20 through a PC interface unit 11 for interfacing a peripheral device and a control unit of the computer, and the PC interface unit 11, and also provides a low value. The control unit 12 receives the test signal from the pass filter unit 80, determines the test result, and outputs the test signal to the monitor 15, and the monitor 15 outputs the screen of the synchronous signal test result from the control unit 12. Configure.

The clock generator 20 includes a burst synchronizer 22 that generates a burst signal SBT according to the test start signal SST of the computer 10, and the burst synchronizer 22. A frequency multiplier 24 for multiplying and outputting a burst signal SBT of the frequency signal; The square wave unit 26 converts the signal SM of the frequency multiplier 24 into a square wave and outputs the clock signal SCLK.

The deflection signal level control unit 30 attenuates the horizontal deflection signal SHDY of about 1.2 dB to about 1.2 V, and attenuates the vertical deflection signal SVDY of about 300 V to about 3 V. Vertical amplification section 31b, horizontal amplification section 33a for amplifying the output signal of the horizontal attenuation section 31a to a predetermined level, and vertical amplification section for amplifying the output signal of the vertical attenuation section 31b to a predetermined level. It consists of a part 33b.

The horizontal / vertical synchronous signal generator 40 is a horizontal synchronous signal (SHS) according to the horizontal deflection signal from the deflection signal level control unit 30 by the clock signal SCLK of the clock signal generator 20. The vertical synchronization signal SVS according to the vertical deflection signal from the deflection signal level control unit 30 by the horizontal synchronization signal generator 45a and the clock signal SCLK of the clock signal generator 20. And a vertical synchronization signal generator 45b for generating < RTI ID = 0.0 >

The differential amplifier 70 differentially amplifies the reference synchronization signal SHR of the reference synchronization signal generator 60 and the synchronization signal SHS of the horizontal / vertical synchronization signal generator 40. 75a), and a vertical differential for differentially amplifying the reference synchronization signal SHR (SVR) of the reference synchronization signal generator 60 and the synchronization signal SHS (SVS) of the horizontal / vertical synchronization signal generator 40. It consists of an amplifier 75b.

The low pass filter 80 converts the horizontal differential amplification signal of the differential amplifier 70 to a DC level and provides the horizontal low pass filter 85a to the computer 10 and the differential amplifier 70. And a vertical low pass filter 85a provided to the computer 10 by varying the vertical differential amplification signal of the "

3 is a timing chart showing output waveforms for the main block of the inspection apparatus according to the present invention.

Operation according to the apparatus of the present invention configured as described above will be described in detail below based on the accompanying drawings.

Referring to FIG. 2 and FIG. 3, when the examiner inputs the TV signal to the computer 10, the control unit 13 of the computer 10 is the internal PC interface unit 11; When the inspection start signal SST is provided to the clock generation unit 20 as shown in FIG. 3, the burst synchronization generation unit of the clock generation unit 20 is generated by the inspection start signal SST. 4 at 22 Generates a burst synchronization signal SBT of sine wave alternating current, and the generated signal SBT is multiplied by approximately four times in the frequency multiplier 24, and then the multiplied signal SM is transferred to the square wave portion 26. In the square wave section 26, the The sine wave signal of the degree is converted into a square wave signal, and the clock signal SCLK is output to the reset unit 50, the horizontal / vertical synchronous signal generator 40, and the reference synchronous signal generator 60, respectively.

On the other hand, the deflection signal level control unit 30 adjusts the deflection signal SHDY (SVDY) made based on the synchronization signal of the television, and then provides it to the horizontal / vertical synchronous signal generator 40, which will be described in detail. First, the 1.2 kHz horizontal deflection signal SHDY is attenuated at a ratio of 1000: 1 by the horizontal attenuation portion 31a of the deflection signal level adjusting unit 30 and output as a signal of about 1.2V. The amplifier 33b is amplified to the size required by the rear circuit block and then output. In addition, the 300V vertical deflection signal SVDY is attenuated at a ratio of 100: 1 by the vertical attenuation section 31a of the deflection signal level control unit 30 and output as a signal of about 3V. The signal is amplified to the size required by the rear circuit block in 33b) and then output.

When the clock signal SCLK is input from the clock generator 20 in the horizontal / vertical synchronous signal generator 40, the horizontal / vertical synchronous signal according to the signal scaled by the deflection signal level control unit 30. (SHS) (SVS) is output, which will be described in detail. In the horizontal synchronous signal generator 45a of the horizontal / vertical synchronous signal generator 40, the clock signal SCLK is output from the clock generator 20. Transforms the horizontal deflection signal into a horizontal synchronous signal SHS and outputs it to the reset unit 50 and the differential amplification unit 70, and also generates a vertical synchronous signal of the horizontal / vertical synchronous signal generator 40. In the block 45b, the vertical deflection signal is converted into the vertical synchronization signal SVS by the clock signal SCLK from the clock generation unit 20 and output to the differential amplification unit 70.

The reset unit 50 logically multiplies the clock signal SCLK of the clock generator 20 by the horizontal synchronous signal generator 45a of the horizontal / vertical synchronous signal generator 40. The reset signal SRT is outputted to the reference synchronization signal generator 60, and the reference synchronization signal generator 60 is activated by the reset signal SRT of the reset unit 50, thereby generating the clock signal. According to the clock signal SCLK of the generator 20, the horizontal synchronization signal SHR and the vertical synchronization signal SVR, which are reference synchronization signals, are output to the differential amplifier 70, respectively, for the synchronization signal inspection.

In the horizontal differential amplifier 75a of the differential amplifier 70, the horizontal synchronous signal SHR from the reference synchronous signal generator 60 and the horizontal synchronous signal generator 40 of the horizontal / vertical synchronous signal generator 40 are used. The horizontal synchronous signal SHS from the 45a is differentially amplified and output, and the vertical synchronous signal SVR from the reference synchronous signal generator 60 is output by the vertical differential amplifier 75b of the differential amplifier 70. ) And the horizontal synchronous signal SVS from the vertical synchronous signal generator 45b of the horizontal / vertical synchronous signal generator 40 are differentially amplified and output.

The meaning of the signal output from the differential amplifier 70 will be described. If two input signals to the horizontal differential amplifier 75a and the vertical differential amplifier 75b of the differential amplifier 70 have the same phase, In this case, the output signal level is almost zero, which means that the synchronization signal for inspection and the reference synchronization signal are in phase with each other. If the synchronization signal to be inspected has a phase difference from the reference synchronization signal, there is a signal output from the differential amplifier 70.

Each signal output from the differential amplifier 70 is converted into a DC level by the low pass filter 80 and then provided to the controller 13 by the PC interface 11 of the computer 10. When the input signal is smaller than the preset signal from the control unit 13, the controller 15 outputs that the corresponding synchronization signal is normal. On the contrary, when the input signal is larger than the preset signal, the corresponding synchronization signal is The monitor 15 outputs the abnormality.

As described above, according to the present invention, when the computerized test command is issued, the test result for the synchronization signal is immediately output to the monitor of the computer through the operation as described above, so that the test operation is simplified, and the test result is also reliable. Is high.

According to the present invention as described above, the horizontal / vertical synchronization signal (H / V Deflection Yoke signal) based on the horizontal / vertical synchronization signal (H / V Synchronizing signal) of the television automatically By inspecting, the synchronization signal inspection can be easily performed, and there is a special effect of obtaining accurate inspection results.

The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration. Further, those skilled in the art will readily appreciate that the apparatus for inspecting synchronization signals of the television is not limited to the above-described embodiment.

Claims (6)

A computer 10 for outputting an inspection start signal SST to the clock generator 20 to instruct an inspection start and outputting an inspection result for a synchronization signal according to a signal through the low pass filter 80; A clock signal generator 20 outputting a clock signal SCLK by the test start signal SST of the computer 10; A deflection signal level control unit 30 for adjusting the horizontal / vertical deflection signal SHDY SVD from the inspection target printed circuit board to the magnitude level required by the next circuit block; The horizontal / vertical deflection signal scaled by the deflection signal level control unit 30 is processed by the clock signal SCLK of the clock signal generation unit 20 to respectively output the horizontal / vertical synchronization signal SHS and SVS. A horizontal / vertical synchronous signal generator 40 for outputting; A reset unit 50 for performing an AND operation on the horizontal synchronization signal SHS of the horizontal / vertical synchronization signal generator 40 and the clock signal SCLK of the clock signal generator 20 to output a reset signal SRT. ); A reference synchronous signal which is started by the reset signal SRT of the reset unit 50 and outputs a reference synchronous signal SHR SVR corresponding to the clock signal SCLK of the clock signal generator 20, respectively. Generating unit 60; The reference synchronization signal (SHR) (SVR) of the reference synchronization signal generator 60 and the synchronization signal (SHS) (SVS) of the horizontal / vertical synchronization signal generator 40 are differentially amplified, and the two horizontal synchronization signals ( A differential amplifier 70 for differentially amplifying SHR (SHS) and differentially amplifying and outputting two vertical synchronization signals SVR (SVS); A low pass filter 80 for changing the output signal of the differential amplifier 70 to a DC level and providing it to the computer 10; Synchronous signal inspection apparatus of the TV comprising a. The clock generation unit (20) of claim 1, further comprising: a burst synchronization generator (22) for generating a burst signal (SBT) in response to a test start signal (SST) of the computer (10); A frequency multiplier 24 for multiplying and outputting a burst signal SBT of the burst synchronous generating unit 22; A square wave unit 26 for converting the signal SM of the frequency multiplier 24 into a square wave and outputting it as a clock signal SCLK; Synchronous signal inspection device of a television, characterized in that consisting of. 2. The deflection signal level adjusting unit (30) according to claim 1, further comprising: a horizontal attenuation unit (31a) for attenuating the horizontal deflection signal (SHDY) of about 1.2 dB to about 1.2V; A vertical attenuator 31b which attenuates the vertical deflection signal SVDY of about 300V to about 3V; A horizontal amplifier 33a for amplifying the output signal of the horizontal attenuator 31a to a predetermined level; A vertical amplifier 33b for amplifying the output signal of the vertical attenuator 31b to a predetermined level; Synchronous signal inspection device of a television, characterized in that consisting of. The horizontal / vertical synchronous signal generator 40 is configured according to the horizontal deflection signal from the deflection signal level control unit 30 by the clock signal SCLK of the clock signal generator 20. A horizontal synchronous signal generator 45a for generating a horizontal synchronous signal SHS; A vertical synchronizing signal generating unit 45b for generating a vertical synchronizing signal SVS according to the vertical deflection signal from the deflection signal level adjusting unit 30 by the clock signal SCLK of the clock signal generating unit 20; Synchronous signal inspection device of a television, characterized in that consisting of. The method of claim 1, wherein the differential amplifier 70 differentials the reference synchronization signal SHR of the reference synchronization signal generator 60 and the synchronization signal SHS of the horizontal / vertical synchronization signal generator 40. A horizontal differential amplifier 75a for amplifying; Vertical differential amplifier 75b for differentially amplifying the reference synchronization signal SHR (SVR) of the reference synchronization signal generator 60 and the synchronization signal SHS (SVS) of the horizontal / vertical synchronization signal generator 40. ; An apparatus for inspecting synchronization signals of televisions, characterized by comprising: The low pass filter (80) of claim 1, further comprising: a horizontal low pass filter (85a) for converting the horizontal differential amplification signal of the differential amplifier (70) to a DC level and providing the same to the computer (10); A vertical low pass filter 85a for changing the vertical differential amplification signal of the differential amplifier 70 to a DC level and providing the same to the computer 10; Synchronous signal inspection device of a television, characterized in that consisting of.