Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1985-09-18
1987-06-16
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
381 11, 381 13, H04H 500
Patent
active
046741216
ABSTRACT:
A circuit is provided for detecting the level of noises in received FM signals in an AM/FM receiver which includes at least an FM intermediate-frequency amplifier, an FM detector connected thereto, an AM intermediate-frequency amplifier and an AM detector connected thereto. This FM noise level detecting circuit includes a frequency converter receiving the output of the FM detector for converting noise components contained in the output of the FM detector into a noise signal of the AM intermediate-frequency, which is in turn outputted to the AM intermediate-frequency amplifier, so that the converted noise signal is amplified by the AM intermediate-frequency amplifier and then detected by the AM detector to produce a DC signal. The signal thus obtained is not only representative of the level of the noise contained in the received FM signal, but also representative of the received FM signal strength.
REFERENCES:
patent: 3728634 (1973-04-01), Watkinson
patent: 4001702 (1977-01-01), Kaufman
patent: 4388496 (1983-06-01), Miyamoto
patent: 4435618 (1984-03-01), Fujishima
Higashiyama Naotoshi
Miura Masami
Isen Forester W.
NEC Corporation
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