Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation
Patent
1988-03-11
1989-11-21
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency or phase modulation
455296, 455311, 455341, H04B 116
Patent
active
048827681
ABSTRACT:
An FM communication device employs a logarithmic amplifier which performs logarithmic conversion of a frequency modulated signal. The beat component level of the output signal of the logarithmic amplifier is checked with a reference level for detecting interference. With the construction set forth above, the FM communication device, according to the invention, detects the ripple of the received FM signal caused by interference of another FM signal by means of the logarithmic amplifier which converts the received FM signal logarithmically and the detection circuit which AM-detects the output signal of the logarithmic amplifier, so that the interference can be detected via the output signal of the detection circuit. In the preferred construction set forth above, the logarithmic amplifier which is often utilized in a detection system for reception magnitude is sufficient as an amplifier circuit required for detecting the interference, and no high-gain and high-performance amplifier is required.
REFERENCES:
patent: 4466128 (1984-08-01), Couvillon
Kanazawa Kenichi
Obana Bunichi
Griffin Robert L.
Kananen Ronald P.
Kuntz Curtis
Sony Corporation
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