FM communication device with avoidance of interference by substa

Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation

Patent

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Details

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

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