KR850003245Y1 - Simplicity adapter for survey of video signal scanal scan wave from - Google Patents

Abstract

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Description

Simple adapter for video signal scanning waveform observation

1 is a circuit diagram of the present invention.

2 is a view illustrating the use of a simple adapter according to the present invention.

3 is a timing diagram of each part of FIG. 1 in the first field observation.

4 is a timing diagram of each part of FIG. 1 in the second field observation.

The present invention relates to an adapter device that enables selection of arbitrary scanning lines of a television video signal using a general oscilloscope.

Waveform monitor should be used to observe necessary scan line of TV video signal. Waveform monitor is expensive, so we want to observe using standard scope in general laboratory, but if we want to observe video signal with general oscilloscope, Since it appears as a waveform, it becomes impossible to observe the required scan line.

Accordingly, an object of the present invention is to provide a simple adapter that enables waveform observation by selecting a necessary scanning line using a general oscilloscope.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a circuit diagram of the present invention, in which 1 is the same mood circuit, 2 and 6 are NAND gates, 3, 8, 14 and 16 are noble gates, 5 and 15 are inverters, 17, 20 and 21 are transistors, 7 and 10 are monostable multivibrators, 4 is a delay circuit consisting of resistor R ₁ and capacitor C ₁ , 9 is a field selector switch, 11 and 22 are variable resistors, 12 and 13 are D flip-flops, and R _2- R ₇ is resistor C ₂ and C ₃ is capacitor, 23 is monitor, 18 is oscilloscope, 24 is oscilloscope's external synchronous input terminal, 26 is video signal waveform of selected scan line, 27 is white line and In is input terminal of adapter. .

First, when the field select switch 9 is connected to select the first field, that is, when the output of the NOA gate 3 is selected to be directly input to the monostable away vibrator 4 through the field select switch 9 will be described.

When the video signal as shown in FIG. 3 (a) is input to the well-known synchronous separation circuit 1, the horizontal synchronous signal and the vertical synchronous signal are separated by the differential circuit and the integral separation circuit in the synchronous separation circuit 1 and outputted from the synchronous separation circuit 1. Therefore, it is assumed that the horizontal synchronizing signal as shown in FIG. 3 (b) is output to the output terminal HD of the sync separation circuit 1 and the vertical synchronizing signal as shown in FIG. 3 (c) is output to the output terminal VD of the sync separation circuit 1. The horizontal synchronous signal and the vertical synchronous signal of FIGS. 3 (b) and 3 (c) are input to the NAND gate 2, and the output of the NAND gate 2 has the same waveform as that of the third (e) degree and is perpendicular to the third (c) degree. The synchronous signal becomes a waveform as shown in FIG. 3 (d) by a delay circuit composed of a resistor R ₁ and a capacitor C ₁ , and is inputted to the noah gate 3 together with the waveform of the third diagram (e). It becomes the waveform like 3 (f) degree. The waveform of FIG. 3 (f) becomes the first field reference pulse, and the synchronous separation circuit becomes the waveform and trigger signal of FIG. The waveform of FIG. 3 (b) which is the horizontal synchronous signal of (1) is inputted to the D flip-flop 12, and the waveform shown in FIG. 3 (h) is output to the non-inverting output terminal Q of the D flip-flop 12, and the D flip-flop 13 and the like. Enter Neugate 14. In addition, the waveform of FIG. 3 (b), which is the horizontal synchronization signal of the synchronous separation circuit 1, is input to the D flip-flop 13 as a trigger signal, and the output shown in FIG. 3 (i) is output to the inverted output terminal Q of the D flip-flop 13. The output of the NOA gate 14 becomes the waveform shown in FIG. 3 (j) by inputting it to the gate 14 together with the waveform shown in FIG. 3 (b). Accordingly, the waveform of FIG. 3 (j) is a trigger pulse synchronized with the video signal, inputted to the external synchronization input terminal 24 of the oscilloscope through the buffer transistor 17, so that the oscilloscope starts at a desired time.

On the other hand, the waveform of Fig. 3 (j), which is the output waveform of Noah gate 14, is input to inverter 15, and the waveform of Fig. 3 (b), which is the horizontal synchronous signal of the output of inverter 15 and the synchronous separation circuit 1, is input to the presbyopia gate 16. The waveform as shown in FIG. 3 (l) is outputted and is converted to a voltage of an appropriate level by the variable resistor 22 to turn on the buffer transistor 21 and overlap with the image signal input through the buffer transistor 20 to generate a third The waveform of n) is input to the monitor 23 so that the white line 27 appears on the CRT. Therefore, the variable resistor 11 is adjusted to generate the signal of the third signal (m), which is a trigger signal delayed by the time of the state of the waveform of the third waveform (g), and the oscilloscope is synchronized. This white line is represented by 27.

Next, the second field observation in which the field selector switch 9 is connected to the output terminal of the NOA gate 10 will be described in detail.

As in the case of the first field observation, when the waveform shown in FIG. 4 (a) as an image signal is inputted to the synchronous separation circuit 1, and inputted to the synchronous separation circuit 1, the horizontal synchronous signal output terminal and the vertical synchronous signal of the output terminal of the synchronous separation circuit 1 are obtained. If the waveforms shown in Figs. 4 (b) and 4 (c) are output to the output terminals HD and VD, the waveforms of Fig. 4 (e) are output to the output terminal of the NAND gate 2, and the resistors R ₁ and capacitance C ₁ are output. The waveform shown in FIG. 4 (d) is output to the delay circuit 4 which is composed of Therefore, the output of the non-anogate 3 is outputted by the waveform shown in the fourth (f) degree and input to the monostable multivibrator 7, and the output is the waveform shown in the fourth (i) degree. On the other hand, the output of inverter 5 becomes a waveform like the fourth (g) degree, and the waveforms of the fourth (d) and the fourth (g) degrees are input to the NAND gate 6 by outputting a waveform like the fourth (h) figure. In addition, the output of the NOA gate 8 is output as a waveform such as the fourth (j), and this waveform becomes the second field reference signal, which is input to the monostable multivibrator 10 which can adjust the delay time with the variable resistor 11. k) is outputted and inputted to D flip-flop 12. Triggered by the waveform of FIG. 4 (k) which is the horizontal synchronization signal of the synchronous separation circuit 1, the waveform as shown in FIG. 4 (l) is transmitted to the non-inverted output terminal Q. Output is inputted to D flip-flop 13, and the waveform shown in FIG. 4 (m) is output to the inverted output terminal Q of D flip-flop 13, and the output of Noah gate 14 is outputted to the buffer shown in FIG. Waveform of Figure 4 (q) Through Transistor 17 is External Synchronous Input of Oscilloscope 13 The input to the character 24 is dropped in synchronism with the oscilloscope 18. Therefore, the CRT 26 of the oscilloscope 18 shows the image signal waveform of the selective scan line, which is the white line shown in the monitor 23 described later in the second field.

On the other hand, the fourth waveform (n), which is the output waveform of Noah gate 14, is displayed with the same waveform as the fourth (o) diagram through inverter 15, and the waveform of the fourth waveform is displayed at the output terminal of Noah gate 16 with the variable resistor 22. By converting the buffer transistor 21 to an appropriate level, the buffer transistor 21 is turned on, and the white line display signal of FIG. 4 (r) is input to the monitor 23 to superimpose the video signal received through the buffer transistor 20 to monitor the white line 27. Therefore, an image signal corresponding to the scanning line of the white line 27 shown in the monitor 23 of the second field is displayed as a waveform on the CRT 26 of the oscilloscope 18.

FIG. 2 is an exemplary wiring diagram of a simple adapter for observing an image signal scanning waveform according to the present invention. In FIG. 23, monitor 24 is an external synchronization input terminal of an oscilloscope 18, 9 is a field select switch, and 11 is monostable in FIG. The variable resistor 27 connected to the multivibrator is a white line of the selective scanning line, and 28 is a probe.

As described above, the present invention has an advantage of observing a waveform of an image signal with an oscilloscope commonly used in a laboratory using a simple adapter without using an expensive waveform monitor.

Claims (1)

In observing a video signal waveform, a first pulse reference generation circuit and a NAND gate composed of a synchronous separation circuit (1), a NAND gate (2), a delay circuit (4), and a noah gate (3) for synchronously separating the video signal. (2, 6), a second field reference signal generation circuit comprising the delay circuit 4, the inverter (5), the noah gates (3, 8) and the monostable multivibrator (7) and the first field reference signal generation circuit And a field select switch 9 for selecting a second field reference signal generation circuit, a monostable multivibrator 10, a D flip-flop 12 and 13, a noar gate 14 and a buffer transistor 17. A scan line selection variable resistor connected to the monostable multivibrator 10 having a trigger pulse generator circuit and a white line generator circuit composed of an inverter 15, a noar gate 16, and buffer transistors 20 and 21. 11) to generate a delayed trigger signal to synchronize the oscilloscope 18. Kigo monitor 23 include a simple adapter for the video signal NL faction type observation, it characterized in that the selection scan lines to appear with a white line.