PARALLEL APERIODIC IF AMPLIFIER Russian patent published in 1998 - IPC

Abstract RU 2118063 C1

FIELD: TV sets. SUBSTANCE: device has first amplifier with controlled gain which is connected in series to second controlled amplifier. Second circuit of intermediate-frequency amplifier has third controlled amplifier, which is connected in series to fourth controlled amplifier. Second and fourth controlled amplifiers are controlled by automatic level control signal in same way. First and third controlled amplifiers are also controlled by automatic level control signal delayed by equal time interval. Gain of radio-frequency amplifier is controlled by automatic level control signal which is delayed by greater interval than that of intermediate frequency amplifier. Frequency of this signal is converted is decreased and this signal is supplied from output of first detector to first and second circuits of intermediate- frequency amplifier through corresponding selective filter. Frequency of output signal of first intermediate-frequency amplifier is decreased in order to generate sound intermediate frequency signal. Output signal of second intermediate-frequency amplifier is detected for video signal detection. Automatic-level control amplifier detects peaks of synchronization pulses which are present in video signal for generation of control signal. EFFECT: increased quality of picture and sound reception. 11 cl, 12 dwg

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RU 2 118 063 C1

Authors

Dzhek Rudol'F Kharford

Dates

1998-08-20Published

1993-10-30Filed