Tweet elimination, or reduction, in superheterodyne receivers

Details Tweet elimination, or reduction, in superheterodyne receivers Tweet elimination, or reduction, in superheterodyne receivers

1987-05-07

1989-11-07

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455183, 455260, 455310, H04B 116

Patent

active

048797570

ABSTRACT:
In a superheterodyne receiver which employs a frequency synthesizer to generate local oscillator (LO) frequencies, there is provided apparatus which determines when an undesirable frequency relation exists, which may produce a condition known as a "tweet", and which adjusts the frequency of the LO signal so as to prevent, reduce or eliminate the tweet.

REFERENCES:
patent: 4542533 (1985-09-01), Parker
patent: 4598422 (1986-07-01), Fellman
patent: 4601060 (1986-07-01), Wine
patent: 4709406 (1987-11-01), Omoto
patent: 4761825 (1988-08-01), Ma

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