Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1993-08-23
1994-11-01
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
348729, 4551801, 455207, H04N 544, H04B 116
Patent
active
053614062
ABSTRACT:
A television receiver includes a single tuner for tuning both television channels and broadcast FM stations. The tuner serves as the first conversion stage of a double conversion FM receiver, wherein the mixer of an FM radio integrated circuit serves as the second conversion stage. A single discriminator circuit is employed for tuning FM radio signals having a first deviation, such as broadcast FM radio signals, and FM radio signals having a second deviation, such as signals of the National Weather Service. Circuitry for amplifying the output signal of the discriminator circuit exhibits a first gain when amplifying FM signals having the first deviation, and exhibiting a second gain when amplifying FM signals having the second deviation.
REFERENCES:
patent: 3886457 (1975-05-01), Petaja
patent: 4627100 (1986-12-01), Takano
patent: 4686707 (1987-08-01), Iwasaki
patent: 4881272 (1989-11-01), Eguchi
patent: 4987605 (1991-01-01), Nose
patent: 5144440 (1992-09-01), Wignot et al.
Griepentrog Dal F.
Wignot Leroy S.
Eisenzopf Reinhard J.
Emanuel Peter M.
Lenihan Thomas F.
Pham Chi H.
Thomson Consumer Electronics Inc.
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