H - Electricity – 04 – B
Patent
H - Electricity
04
B
379/11, 325/31
H04B 1/16 (2006.01) H03D 3/00 (2006.01) H04B 1/10 (2006.01)
Patent
CA 1278043
ABSTRACT OF THE DISCLOSURE 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 enough as an amplifier circuit required for detecting the interference, and no high-gain and high-performance amplifier is required.
561703
Kanazawa Kenichi
Obana Bunichi
Gowling Lafleur Henderson Llp
Sony Corporation
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