Radio receiver with improved automatic gain control

Details Radio receiver with improved automatic gain control Radio receiver with improved automatic gain control

1990-12-13

1993-04-13

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Having measuring, testing, or monitoring of system or part

4552341, 4552411, 455295, 455304, H04B 110

Patent

active

052030199

ABSTRACT:
In a radio receiver in accordance with the heterodyne principle or with the homodyne principle, two additional transmission channels are provided for interference suppression. The two additional transmission channels have a different degree of distortion. Either mixing with a heterodyne oscillator signal takes place in each of the two transmission channels and the resultant intermediate frequency signals or baseband signals are added in phase opposition to give a sum signal, or the output signals of the two additional transmission channels are added in phase opposition to give a sum signal and the resultant sum signal is mixed with a heterodyne oscillator signal to give an intermediate frequency signal or baseband signal. The signals obtained after addition and mixing and derived from the output signals of the two additional transmission channels are frequency-selected and demodulated, and the demodulated signal is used for gain control.

REFERENCES:
patent: 3492583 (1970-01-01), Sinelli
patent: 3605012 (1971-09-01), Kubanoff
patent: 3699461 (1972-10-01), Huntsinger
patent: 4126828 (1978-11-01), Kumagai
patent: 4211978 (1980-07-01), Takahashi
patent: 4305042 (1981-12-01), Tanaka et al.
patent: 4313215 (1982-01-01), Jansen
Patent Abstracts of Japan, vol. 9, No. 248, (E-347)4, Oct., 1985, JP-A-60 096 930.
Patent Abstracts of Japan, vol. 13, No. 108, (P-843)15, Mar., 1989, JP-A-63 285 767.
JP 1 125813A. "Pat. Abstracts . . . " E-808, Aug. 18, 1989; vol. 13, No. 374.

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