Automatic gain control system for direct-access television recei

Details Automatic gain control system for direct-access television recei Automatic gain control system for direct-access television recei

1979-06-22

1981-01-13

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455184, 455200, 455233, 455319, H04B 126

Patent

active

042453500

ABSTRACT:
A control system is described for use in a television receiver adapted to receive multi-band television signals and which has a direct-access type tuning system. In such a tuning system, the receiver employs at least one local oscillator, the output of which is applied to a prescaler for dividing down the frequency of the oscillator signal. Frequently, the oscillator signal fluctuates in amplitude as the oscillator is tuned from channel to channel and from one frequency band to another frequency band. To compensate for such amplitude fluctuations, the control system confines the amplitude of the oscillator signal to an amplitude range which the prescaler can reliably handle and applies the amplitude-controlled oscillator signal to the prescaler.

REFERENCES:
patent: 2082961 (1937-06-01), Koch
patent: 2967235 (1961-01-01), Braun et al.
patent: 3980951 (1976-09-01), Breeze et al.
patent: 4024476 (1977-05-01), Briggs
patent: 4160213 (1979-07-01), Carter

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