Radio receiver with underpass detector

Details Radio receiver with underpass detector Radio receiver with underpass detector

1997-02-03

1999-07-27

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552401, 4552411, 330129, H04B 106

Patent

active

059306939

ABSTRACT:
A radio receiver avoids overshoot or undershoot of its audio output caused by inadequate AGC loop response when driving under an underpass and then back into an unobstructed environment. The AGC loop response time is changed upon detection of the sudden decrease in signal level when entering the underpass. The state of the AGC loop prior to entry into the underpass is stored. Upon exiting the underpass, the stored values are restored so that a proper reception level is immediately obtained.

REFERENCES:
patent: 4574252 (1986-03-01), Slack
patent: 4817192 (1989-03-01), Phillips et al.
patent: 4829263 (1989-05-01), Gulczynski
patent: 4893349 (1990-01-01), Eastmond et al.
patent: 5077834 (1991-12-01), Andros et al.
patent: 5263186 (1993-11-01), Gornati et al.
patent: 5465406 (1995-11-01), Whitecar et al.
patent: 5606284 (1997-02-01), Tamesue et al.

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