FM communication device with avoidance of interference by substantially same channel fm signal

摘要

An FM communication device employs a logarithmic amplifier (16) which performs logarithmic conversion of a frequency modulated signal. The beat component level of the output signal of the logarithmic amplifier (16) 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 (16) which converts the received FM signal logarithmically and of a detection circuit (19 to 22) which AM-detects the output signal of the logarithmic amplifier (16), so that the interference can be detected via the output signal of the detection circuit (19 to 22).