SU1720166A1 - Device for discriminating sync signal from composite picture signal - Google Patents

Abstract

The invention relates to television and can be used in the construction of television cameras operating in slave mode, receiving devices of communication lines, video recorders, video monitoring devices and television receivers. The purpose of the invention is to improve the accuracy of the selection of the synchronization signal from the input signal. The device for extracting the synchronization signal from the full television signal contains a video amplifier 1, an operational amplifier 2, a limited bandwidth, an integrating capacitance 3, a key 4, a sample-storage unit 5, a resistive divider 6, the first comparator 7, a low-pass filter 8, an amplifier 9, the peak a detector 10, a resistor 11, a controlled current generator 12, a second comparator 13. a direct current amplifier 14, a time selection unit 15, and a control pulse driver 16. The device provides adaptation with respect to changes in the range of the input full television signal, addition of the plot of the transmitted television image, and increases the accuracy of the selection of the synchronization signal in the presence of noise in the input video signal. 2 hp ff, 2 ill. (L

Description

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Claims (3)

Claim 1. A device for extracting a synchronization signal from a full television signal, comprising serially connected a control pulse generator and a key that integrates a capacitance, first and second comparators and a resistive divider, characterized in that, in order to increase the accuracy of extracting the synchronization signal from the input signal, a series-connected operational amplifier, a video amplifier and a sampling and storage unit, a series-connected low-pass filter (LPF), a differential amplifier and a peak a detector, as well as a resistor and a controlled current generator, while the output of the sample-storage unit is connected to a resistive divider, the middle point of which is connected to the first input, the first comparator, the second input. which is connected to the input of the sample-storage unit, the control input of which is connected to an additional output of the control pulse shaper, the input of which is connected to the output of the second comparator, to the inputs of which are connected the output of the low-pass filter and the output of the controlled current generator, connected to one of the terminals a torus, the other output of which is connected to the output of the peak detector and with the inverting input of the differential amplifier, the input of the video amplifier is connected to the input of the low-pass filter and is the signal input of the device, the output of the video amplifier is connected via a key to the inverting input of the operational amplifier and to one of the conclusions of the integrating capacitor, the other output of which connected to the output of the operational amplifier, the non-inverting input of which is connected to a common bus, and the input of the controlled current generator is a threshold voltage control input . 2. The device pop. 1, which is connected with the fact that the output of the second comparator is connected to the input of the shaper of control pulses through a block of time selection. 3. The device according to claim 1, the r ect in that the midpoint of the resistive divider is connected to the input of the threshold voltage control of the controlled current generator through a DC amplifier. Figure 1