KR100190646B1 - Video signal test apparatus and method using personal computer - Google Patents

Abstract

The present invention relates to an apparatus and method for inspecting a video signal using a personal computer (PC). A PC monitor for outputting a waveform from the PC main body; and a controller for providing a pattern signal to the circuit board, and outputting the processed video signal to the control box And a control module for providing a signal from the passive sheet to the PC main body, wherein the apparatus for inspecting a signal processing board used in a VTR, a TV, or the like is a personal computer, So that it can be measured in real time.

Description

Apparatus and method for inspecting a video signal using a personal computer (PC)

The present invention relates to an apparatus and method for inspecting a video signal using a personal computer (PC). More particularly, the present invention relates to an apparatus for inspecting a signal processing circuit board used in a VTR or a TV, And more particularly, to a video signal inspection apparatus and method using a personal computer (PC).

Generally, a process for producing a circuit board for processing video and audio signals can be roughly divided into three processes. First, a process of mounting a corresponding component to a circuit board using a component mount, and secondly, A process of inspecting the back surface of the circuit board with a component inspection device, and a process of inspecting signals output from the backside circuit board with a tester.

The circuit board is a substrate for processing audio and video signals included in a video tape recorder (VTR), a video camera, a television (TV), and the like. By inspecting the output signal after inputting the reference signal by inputting the reference signal to this circuit board, it is possible to diagnose the cause of the case where the video signal is not clean or the video signal is distorted, do. For example, in the circuit board, a plurality of signals such as a video signal, a luminance signal chroma signal, and an audio signal, which are composite video signals, are outputted from a plurality of test points. And the adjustment volume is adjusted to the standard value.

The construction of the prior art related to the general technology is shown in FIG. 1, and with reference to FIG. 1, there is shown a manual jig 1 installed to inspect the conventional circuit board 2 shown in FIG. The circuit board 2 is placed at the measurement position on the manual jig 1 and a predetermined pattern signal is input to the signal input terminal of the manual jig 1. The video signal processed and output on the circuit board is received by the measurement device 3, Inspect.

The improvement and the problem of the prior art that the present invention is intended to overcome in the prior art as described above is that when a video signal of a circuit board is measured using a conventional video tape recorder manual jig, As a result, not only the inspection time is prolonged but also the inspection work is troublesome, resulting in a deterioration of the productivity due to the lowering of the working efficiency.

In the case of inspecting a video signal by simply connecting a personal computer having a monitor of approximately 480x620 size, sampling 6 MHz of the video signal at 30 MHz (fs = 1 / Ts) yields one horizontal scanning time (1H) = 63.5 .mu.S) is about 1920 (Th / Ts). The amount of data to be generated is 620 pieces of output data, the amount of data to be output over 3 times, that is, Since the entire video signal waveform corresponding to one horizontal scanning period can not be outputted, it is not possible to measure the waveform of the video signal in real time, and therefore, in order to measure the video signal in real time, Could not be used as a scope.

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

Accordingly, it is an object of the present invention to provide an apparatus for inspecting a signal processing circuit board used in a VTR, a TV, or the like by using a personal computer (PC) which can measure a video signal of a signal processing circuit board in real time using a personal computer And a signal inspection apparatus and method.

According to an aspect of the present invention, there is provided a video signal inspection apparatus using a personal computer (PC) of the present invention as a technical means for accomplishing the above technical object, A keyboard for providing various user selection information to the control device of the PC main body, including selection of a signal test and selection of a zoom function and selection of a zoom level; A DIO device for inputting / outputting data between the external control box and the internal control device, a frequency counter for counting the frequency based on the signal from the control box, A trigger device for outputting a trigger signal according to a signal of the pattern generator; an A / D conversion device triggered by the trigger signal to convert a signal from the control box to digital; and a graphic D converter according to an inspection program and a data size-pixel positional relationship table by controlling the devices in accordance with an ISA bus system in accordance with a pre-built video signal inspection program. And outputting the result to a monitor; A pattern generator operating according to a control signal through the GIPB to provide a pattern signal to a manual jig; A passive jig for providing a pattern signal of the pattern generator to a circuit board and outputting a video signal processed and output on the circuit board to a control box; A control box operating according to a control of the control device through the DIO device and operating according to a control signal through the DIO device to provide video signals from the control device to the devices of the PC main body; And a PC monitor for outputting a video waveform of the graphic device.

According to another technical means for achieving such a technical object, a video signal inspection method using a personal computer (PC) of the present invention includes a PC main body having a video test program built therein, A PC monitor, a passive jig for providing a pattern signal to the circuit board, and outputting a processed video signal to the control box, and a control box for providing a signal from the passbook to the PC body, A method for measuring a signal, comprising: a first step of A / D-converting a video signal of a circuit board through a passive jig and a control box to a predetermined sampling frequency to obtain data corresponding to a video signal; Determining whether or not the zoom function is selected, controlling the output of the acquired data to the monitor when the zoom function is not selected, selecting the zoom level when the zoom function is selected, and proceeding to the next step; A third step of calculating an entire data amount to be displayed in one horizontal scanning period according to the selected zoom level (Z0, Z1, Z2); A fourth step of outputting at least one data corresponding to one horizontal pixel among the obtained data to pixels of a corresponding size according to a data size-pixel position relation table; A fifth step of repeating the fourth step for the number of horizontal pixels and then terminating; . ≪ / RTI >

FIG. 1 is a view showing a conventional video signal inspection apparatus.

FIG. 2 is a block diagram of a video signal testing apparatus according to the present invention.

FIG. 3 is a flow chart showing a video signal inspection method according to the present invention.

4 (A) is a waveform diagram of a video signal as a signal to be inspected in the present invention, and FIG. 4 (B) is a data string obtained by sampling a video signal according to the present invention.

FIG. 5 is a waveform diagram of a video signal output to a personal computer (PC) monitor according to the present invention.

FIG. 6 is an enlarged waveform diagram of the CI portion shown in FIG. 5, wherein (A) is a waveform diagram in a 1: 1 correspondence method and (B) is a waveform diagram in a 1: N correspondence method.

FIG. 7 is a data size-pixel positional relationship table according to the present invention. FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

1: Manual jig 10: PC body

11: control device 12: graphic device

13: A / D converter 14: Trigger device

15: Frequency counter 16: DIO device

17: GPIB 20: Pattern Generator

30: control box 40: PC monitor

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a video signal testing apparatus using a personal computer (PC) according to the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a block diagram showing a video signal testing apparatus according to the present invention. Referring to FIG. 2, a video signal testing apparatus using a personal computer (PC) of the present invention selects a video signal test, A keyboard 5 for providing various user selection information to the control unit of the PC main body 10 including selection of a zoom level, a GIPB unit 17 for outputting a pattern generation control signal to the pattern generator 20, A DIO device 16 for inputting / outputting data between the external control box 30 and the internal control device 11 and a frequency counter 15 for counting the frequency based on the signal from the control box 30 A trigger device 14 for outputting a trigger signal according to the signal of the pattern generator 20 and an A / D converter 14 for triggering by the trigger signal and converting the signal from the control box 30 into a digital signal, (13), and provides a graphical output to the monitor D conversion device 13 by controlling the devices in accordance with an ISA bus method in accordance with a graphics device 12 and a video signal inspection program built in advance, And a control unit 11 for controlling the display unit 11 to output the pattern signal to the monitor through the GPIB 17 and to output the pattern signal to the manual jig 1 A manual jig 1 for providing a pattern signal of the pattern generator 20 to a circuit board and outputting a video signal processed and output on the circuit board to a control box, And operates in accordance with the control of the control device 11 through the device 16 and operates by a control signal through the DIO device 16 to transmit the video signal from the manual jig 1 to each device of the PC main body 10 Provide control box ( And a PC monitor 40 for outputting a video waveform of the graphic device 12 on the screen.

4 (A) is a waveform diagram of a video signal as a signal to be inspected in the present invention, and FIG. 4 (B) is a data string obtained by sampling a video signal according to the present invention. FIG. 5 is a waveform diagram of a video signal output to a personal computer (PC) monitor according to the present invention, FIG. 6 is a waveform diagram of an enlarged CI portion shown in FIG. 5, (B) is a waveform diagram according to the 1: N correspondence method. And FIG. 7 is a data size-pixel positional relationship table according to the present invention.

The operation according to the apparatus of the present invention thus configured will be described in detail below with reference to the accompanying drawings.

The operation of the apparatus according to the present invention will be described with reference to FIGS. 2 to 6. In the first step 51, the video jig 1 and the control box 30, D converter 13 with a predetermined sampling frequency to acquire data corresponding to the video signal. More specifically, if the test is firstly selected by the keyboard 5, The pattern generator 20 recognizes this and controls the pattern generator 20 to generate the pattern. The pattern generator 20 generates the pattern signal and provides it to the manual jig 1 according to the control. The passive jig 1 provides the pattern signal to a circuit board placed on the top, and then provides a processed and output video signal as shown in FIG. 4 (A) to the control box 30. The control box 30 provides the video signal to the PC main body 10 and the frequency counter 15 of the PC main body 10 counts the frequency and the trigger device 14 generates a video signal based on the video signal The A / D converter 13 samples the video signal at a predetermined sampling frequency fs and then converts the sampled signal into a digital signal to output data corresponding to the video signal .

In the second step 52, it is determined whether or not the zoom function is selected. If the zoom function is not selected, control is performed so that the acquired data is output to the PC monitor 40. If the zoom function is selected, Proceed to the next step. The zoom level (ZOOM LEVEL) is classified according to the number of data corresponding to one horizontal pixel. For example, Z0 is data for one pixel, Z1 is data for one pixel, Z2 is data for one pixel .

In the third step 53, the total amount of data to be displayed on the PC monitor 40 in one horizontal scanning period is calculated according to the selected zoom level Z0, Z1, and Z2. (Th = 63.5 占 퐏) generated when sampling 6 MHz of the video signal at 30 MHz (fs = 1 / Ts) when 480.times.620 pixels (vertical.times.horizontal) Is about 1920 (Th / Ts) pieces. This is shown in FIG. 4 (B).

In the fourth step 54 and 55, at least one data corresponding to one horizontal pixel of the obtained data is output as a pixel of a corresponding size according to the data size-pixel position relation table, The maximum value (max) and the minimum value (min) are calculated from at least one data corresponding to one horizontal pixel among the acquired data as shown in FIG. 5B, And outputs a pixel which exists between the pixels for which the maximum value and the minimum value are output to be connected by a line on the screen. This is shown in FIG. 6 (A) and FIG. 6 (B).

This will be described in more detail with reference to FIG. 7, since the number of decimals of the monitor is 620, so three data are associated with one pixel. Therefore, the maximum and minimum values are obtained by dividing the data into three, and output is made corresponding to the number of pixels constituted vertically with respect to the horizontal pixel according to the magnitude of the maximum value and the minimum value, respectively.

For example, the monitor output area is defined as 100 to 400 in the vertical area, and then the size of the video signal is divided into 100 to 400, and the total size of the video signal is divided into the data size-pixel positional relationship A table is created. When the maximum value is 1, the pixel is associated with the pixel 400. When the minimum value is 0, 100 is assigned to the table.

In the fifth step 56, the fourth step is repeated for the number of horizontal pixels, i.e., 620, and then the process is terminated.

As described above, according to the present invention, a device for inspecting a signal processing circuit board used for a VTR, a TV, or the like can measure a video signal of a signal processing circuit board in real time using a personal computer, There is a special effect that enables measurement of various video signals.

The above description is only an explanation of one embodiment of the present invention, and the present invention can be variously modified and modified within the scope of its constitution. In addition, those skilled in the art will appreciate that the apparatus and method for inspecting a video signal are not limited to the embodiments described above, but may be modified in various ways.

Claims (3)

A keyboard 5 for selecting video signal inspection and simultaneously providing various user selection information to the control unit of the PC main body 10 including a zoom function selection and a zoom level selection; A GIPB device 17 for outputting a pattern generation control signal to the pattern generator 20, a DIO device 16 for inputting / outputting data between the external control box 30 and the internal control device 11, A frequency counter 15 for counting a frequency based on a signal from the control box 30; an A / D converter 13 triggered by the trigger signal to convert a signal from the control box 30 into a digital signal; A graphic device 12 for providing a graphic output to a monitor, and an A / D converter 13 for controlling the devices in accordance with an ISA bus system in accordance with a video signal inspection program built in advance, A PC body including a controller (11) for processing the inputted data according to an inspection program and a data size-pixel position relation table and outputting the processed data to a monitor; A pattern generator 20 operating according to a control signal through the GPIB 17 to provide a pattern signal to the passive jig 1; A passive jig 1 for providing a pattern signal of the pattern generator 20 to a circuit board and outputting a video signal processed and output on the circuit board to a control box; And operates in accordance with the control of the control device 11 through the DIO device 16 and operates by the control signal through the DIO device 16 to transmit the video signal from the manual jig 1 to the PC main body 10 A control box (30) provided to the apparatus; A PC monitor 40 for outputting a video waveform by the graphic device 12; And a controller for controlling the video signal of the personal computer. A keyboard, a PC main body having a built-in video test program, a PC monitor for outputting a waveform from the PC main body, and a manual control circuit for providing a pattern signal to the circuit board and then outputting the processed video signal to the control box A method of measuring a video signal on a circuit board, the method comprising: providing a control box for providing a signal from the jig and the hand paper to the PC body, A first step of A / D-converting the video signal of the circuit board to a predetermined sampling frequency through the passive jig and the control box to obtain data corresponding to the video signal; Determining whether or not the zoom function is selected, controlling the output of the acquired data to the monitor when the zoom function is not selected, selecting the zoom level when the zoom function is selected, and proceeding to the next step; A third step of calculating an entire data amount to be displayed in one horizontal scanning period according to the selected zoom level (Z0, Z1, Z2); A fourth step of outputting at least one data corresponding to one horizontal pixel among the obtained data to a pixel of a corresponding size according to a data size-pixel position relation table; A fifth step of repeating the fourth step for the number of horizontal pixels and then terminating; A video signal inspection method using a personal computer (PC) 3. The method as claimed in claim 2, wherein the fourth step calculates a maximum value (max) and a minimum value (min) in at least one data corresponding to one horizontal pixel of the obtained data, A step of outputting the image data to pixels of a corresponding size, And outputting a line connecting a maximum value and a minimum value output from the screen to a screen, the method comprising the steps of: