FM signal detection apparatus with automatic gain control circui

Details FM signal detection apparatus with automatic gain control circui FM signal detection apparatus with automatic gain control circui

1990-04-30

1992-12-29

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455260, 455263, 455266, H04B 106

Patent

active

051758814

ABSTRACT:
An apparatus for receiving broadcast FM waves using an FM (Frequency Modulated) detector is disclosed in which an output signal level of an automatic gain controller (AGC) is controllable so that when the C/N ratio is reduced and the output level of the automatic gain controller is reduced, the loop gain of a PLL type FM demodulator is accordingly reduced and response is delayed with the bandwidth being narrowed . Therefore, since delayed threshold extension is applied thereby, no signal noise, such as white points appearing on an image screen, will occur.

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Patent Abstracts of Japan, vol. 8, No. 39 (E-228), Feb. 21, 1984 and JP-A-58 196 737 (Nippon Denki K.K.). Nov. 16, 1983.
Philips Telecom Review, vol. 37, No. 1, Mar. 1979, pp. 1-10, Hilversum, NL; P. Bikker et al.: "A Microprocessor-Controlled Communications Receiver".

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