Circuit for modifying the IF response of a television receiver

Details Circuit for modifying the IF response of a television receiver Circuit for modifying the IF response of a television receiver

1979-09-04

1980-11-11

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358188, H04N 521

Patent

active

042336309

ABSTRACT:
A "walking circuit" for modifying the IF frequency response of a television receiver is disclosed. The walking circuit includes an amplifier having a pair of selectable gain-degeneration impedances, one such impedance providing the amplifier with a wide band frequency response and the other providing the amplifier with a frequency sensitive response whose peak is centered at the IF frequency of the picture carrier. A current-steering circuit, responsive to the level of the signal received by the receiver, selects the wide band degeneration impedance by steering current through it when high level signals are received so that the amplifier does not modify the IF frequency response. When low level signals are received, current is steered through the frequency sensitive degeneration impedance for modifying the IF frequency response such that maximum gain occurs at or near the IF frequency of the picture carrier.

REFERENCES:
patent: 2980765 (1961-04-01), Holloway

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