FM demodulating circuit having an insensitive frequency point

Details FM demodulating circuit having an insensitive frequency point FM demodulating circuit having an insensitive frequency point

1981-12-21

1985-12-17

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 23, 358 36, 358 37, 358 38, 360 29, H04N 576, G11B 374

Patent

active

045595666

ABSTRACT:
An FM demodulating circuit demodulates a frequency-modulated signal of a predetermined channel of frequency-modulated signals of respectively different channels, where the frequency-modulated signals are obtained by frequency-modulating carriers of respectively different frequencies by information signals of respectively different channels and transmitting the frequency-modulated signals in a mutually multiplexed state. The FM demodulating circuit has a demodulated output characteristic such that a frequency at which a differential value describing the slope of a demodulated output characteristic curve becomes maximum, is substantially equal to a center frequency of the frequency-modulated signal of the above predetermined channel, and a frequency at which the differential value becomes minimum is equal to a center frequency of a frequency-modulated signal of a channel other than the above predetermined channel.

REFERENCES:
patent: 3925605 (1975-12-01), Rennick
patent: 3934263 (1976-01-01), Palmer
patent: 3989893 (1976-11-01), Eisema
patent: 3997797 (1976-12-01), Sahara et al.
patent: 4018987 (1977-04-01), Keizer
patent: 4342000 (1982-07-01), Ogita
patent: 4353034 (1982-10-01), Kimoto
patent: 4356510 (1982-10-01), Nakayama
patent: 4359694 (1982-11-01), Suenaga
patent: 4393489 (1983-07-01), Mehrotra
IEEE Transactions on Consumer Electronics, vol. CE-27, No. 3, Aug. 1981, pp. 361-365; "TV Multichannel Sound-Savior or a New Sacred Cow?".
IEEE Transactions on Consumer Electronics, vol. CE-27, No. 3, Aug. 1981, "New IC for Sound Multiplex Decoder".

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