SU1246411A1 - Selector of frame sync pulses - Google Patents

Abstract

The invention relates to a television and measuring technique. The accuracy of personnel sync pulse selection increases. The receiver clock signal (SSP) is fed to the multivibrator 1 and the pulse shapers (PI) 2,3, highlighting, respectively, negative. and put fronts SSP. Multivibrator 1 on put, the front of the ERP generates a signal of a duration. A longer equalizing duration and a smaller clock pulse. On the first otr. front of equalizing impulses attributed to the element. And 4, multivibrator 5 generates a signal. Multivibrator 6 selects its leading edge and sets the code 0101 in the counter (MF) 7. After the fifth pulse arriving at the subtracting input of the MF 7 from AND 4, the signal from its output sets trigger 8 to position 1. In this case, 9 passes the signal with PI 3. The signal from the element And 9, respectively. the beginning of the impulse field sets the trigger 11 in position 1, and in the MF 12 sets the code 0101. The signal from the trigger 11 permits the passage through the AND 10 element to the subtracting input of the MF 12 pulses with PI 3. On the impulse impulse the signal from the MF 12 sets the trigger 11 in the position of O. T. obr. At the output of the trigger 11, a sync pulse field signal is generated. 1 il. You about ate 0 1 2

Description

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The invention relates to a television and measuring technique and can be used to synchronize the processes associated with the observation or processing of television signals and images. The purpose of the invention is to improve the accuracy of the selection of personnel sync pulse.

The drawing shows a structural electrical circuit diagram of the device-.

The frame sync pulse selector contains the first multivibrator 1, the first 2 and the second 3 pulse shapers, the first element AND 4, the second multivibrator 5, the third multivibrator 6, the first counter 7, the first trigger 8, the second element And 10, the second trigger 11 and the second counter 12.

The selector staffing clock works as follows.

The receiver clock signal (SSP) is fed to the input of the first multivibrator 1, which, on the positive edge of the SSP signal, generates a signal with a duration greater than the equalizing duration and smaller synchronizing pulses, to the first driver 2, which separates the negative edge of the SSP signal and to the second driver 3, which is located on the positive edge of the BSC signal.

On the first element 4 and 4, a negative front of equalizing pulses is allocated, on the first of which the second multivibrator 5 generates a signal longer than ten-line intervals. The third multivibrator 6 selects its leading edge and sets the code 0101 on the first counter 7. The first counter 7 operates in the subtractive mode, and after the fifth pulse from the output of the first element 4, the code at its output is equal to 0000J and the first trigger 8 is set to one state and allows the signal to be prohohozhchenie positive edge SSP from the output of the second driver 3.

The signal from the output of the second element, And 9, corresponds to the beginning of the pulse field and sets the second trigger 11, the direct output of which is the output of the device, to one state; it resets the first one. trigger B and sets on the second counter 12 a code 0101. The signal from the direct output of the second trigger 11 allows

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 It passes through the third element I 10 pulses of the positive front of the ERP from the output of the second driver 3, which correspond on the selected time interval to the negative front of the tie-in. The signal from the output of the third element And 10 is fed to the subtractive input of the second counter 12 and by the fifth pulse corresponding to the end of the pulse field, the code at the output of the second counter 12 is 0000, while the second trigger 11 is set to zero and its output is At the output, a signal of the field sync pulse is generated, with its leading and falling edges rigidly attached to the edges of the pulses of the original SCF.

Claims (1)

Invention Formula A frame sync selector containing the first multivibrator, first, second, third elements AND, the first and second pulse shapers, the first and second triggers, characterized in that, with (the aim of improving the accuracy of personnel sync selection, the second and third multivibrators, the first and the second counters, while the output of the first multivibrator is connected to the first input of the first element I, the output of which is connected to the synchronization input of the first counter, the transfer output of which is connected to the clock input neiTB oro trigger, and the setup input is connected to the inverse output of the third multi-jibrator, whose input is connected to the inverse output of the second multivibrator, whose input is connected to the output of the first element And, the second input of which is connected to the output of the first pulse shaper, the input of which is connected to the input of the first a multivibrator whose input is the input of a frame sync pulse selector and the input of a second pulse shaper, the output of which is connected to the first input of the third element And and the first input of the second element This AND is the second input of which is connected to the direct output of the first trigger, the inverse output of which is connected to the inverse input of the first trigger, the zero input of which is connected to the output of the second element AND and the single input of the second trigger. 3 -12464114 the inverse output of which is connected to the 1st house of the third element I, the output of which is the information input of the second trigger, which is connected to the synchronization input, the synchronization input is connected to the output of the second counter, the installation input of the transfer code of the second counter, is connected to the output of the second direct output at the second output - j elements,