SU1075445A1 - Device for generating television signal oscillogram - Google Patents

Abstract

A DEVICE FOR THE FORMATION OF OSCILLOGRAMS OF TELEVISION SIGNALS containing a serially connected video amplifier, a switch and a memory unit, a synchronizer, the first output of which is connected to the synchronous input of the video monitoring unit (WRC;), the information input of which is combined with the input of the video amplifier, and the second output of the synchronizer is connected. delays, characterized in that, in order to reduce the waveform generation time, a threshold block and a pulse shaper are introduced, which but connected and connected between the output of the memory unit and the information input of the video monitoring unit and the current generator, the output of which is connected to the second input of the switch, the memory block is designed as a capacitor, the output of the adjustable delay unit is connected to the third input of the switch, and the second output of the video amplifier "Connected to the synchronizer input. §

Description

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Fig. 1 The invention relates to television technology and can be used in television viewfinders for kin filmmakers for monitoring the gradations of illumination of objects of a rendered plan, and also as a measuring instrument. The closest to the invention to the technical essence is a device for generating oscillograms of television signals, containing serially connected video amplifiers, a switch and a memory block, made in the form of a horn with the horizontal and frame sweepers connected to it and the blanking unit, the synchronizer, the first the output of which is connected to the synchronous input of the video monitoring unit (BKR), whose information input is combined with the input of the video amplifier and connected via an amplifier to the output of the memory unit, and Torah synchronizer output is connected to the input of the variable delay unit and the second input switch lj. A disadvantage of the known devices is the large time of oscillography of one signal, i.e. the need to obtain an oscillogram of one time signal of two fields (frames). The purpose of the invention is to reduce the time of formation of the waveform. The goal is achieved by the fact that the device for generating television waveforms of television signals containing serially connected video amplifier, switch and ... memory block, synchronizer, the first output of which is connected to the synchronous input VKB, whose information input is combined with the input of the video amplifier, and the second output the synchronizer is connected to the input of the adjustable delay block, a threshold block and a pulse shaper are inserted, which are connected in series and connected between the output of the memory block and the information WKB input, and a current generator, whose output is Ser nen a second input switch, etc. This memory unit is formed as a capacitor, the output of the variable delay unit is connected to the third input of the switch, and the second output video amplifier connected to the input synchronizer. FIG. 1 shows a structural electrical circuit of an apparatus for generating oscillograms of television signals; FIG. 2 - the diagram of si n al about o. The device contains video amplifier 1, VKB 2, synchronizer 3, memory block 4, current generator 5, horny block b, switch 7, pulse formaker 8, block 9 of adjustable delay. The device works as follows. The video signal from the output of video amplifier 1 (Fig. 26) is fed to the memory block 4, made in the form of a capacitor, through the switch 7. A vertical section of the image oscillates, i.e. a set of picture elements located at the same distance from the left raster raster. The temporal position of the elements of the specified cross section is constant relative to the beginning of the lines (horizontal sync pulses). In this connection, only one element of the vertical section of an image belonging to a given line is analyzed during each line. The position of the cross section is determined by the adjustable delay unit 9. Prior to the arrival of the control signal from block 9 (Fig. 2a), the input video signal is memorized on the capacitor, and at the time corresponding to the cross section of the image chosen for oscillography, block 9 switches the switch 7 and the video signal does not come to the capacitor until the next horizontal sync pulse. The current generator 5 thereafter discharges the capacitor at least until the trigger voltage of the threshold gloss b. Since the capacitor is discharged in memory block 4 by the direct current of generator 5, the time it takes for the voltage on the capacitor to reach the response voltage of the threshold block b is related to the video signal size in the section under study. The imaging unit 8 generates pulses whose temporal position corresponds to the response times of the threshold unit 6 of FIG. 2, and the amplitude .. and the polarity cause them to flash on the screen of the VCB 2. The threshold unit returns to its initial state with a control impulse from the unit 9. Shaper 8 pulses are triggered by the fronts of the pulse of the threshold block, and the time from the analyzed image section to the output pulse of the pulse shaper is proportional to the instantaneous value of the video signal in the tested vertical kalny section of the image in the given line and threshold of operation of the threshold device. Both the pulses from the output of the imaging device 8 pulses and the full video signal from the input of the entire device are fed to the input of the WKB 2, which allows, as in the known device, to simultaneously perform high-quality control of the television image and distribution.

dividing levels of elevation in the vertical section of the image. Dp of the visual signal level of the video signal in the section under study from the adjustable delay unit 9 is given a control signal in the form of short pulses, with which the threshold unit 6 returns to the initial state (Fig. 2b). At the same time, on the WKB screen, complete

television images, vertical line, corresponding to the studied cross section of the image, and line, reproduced; in the section under study.

Consequently, the oscilloscope of the studied section is formed over a single field (frame), i.e. two times faster than in the known device.

Claims (1)

A device for generating waveforms of television signals, comprising a video amplifier, a switch and a memory block, a synchronizer, the first output of which is connected to the clock input of the video control unit (WKB), the information input of which is combined with the input of the video amplifier, and the second output of the synchronizer is connected to the input of the delay unit characterized in that, in order to reduce the waveform generation time, a threshold block and a pulse shaper are introduced, which are connected in series inenes and are connected between the output of the memory block and the information input of the video control unit and a current generator whose output is connected to the second input of the switch, the memory block is made in the form of a capacitor, the output of the adjustable delay unit is connected to the third input of the switch, and the second output of the video amplifier is connected to the input synchronizer.