Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1981-06-30
1985-04-16
Laroche, Eugene R.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329126, 329134, 329145, 455214, H03D 314, H03D 304
Patent
active
045118493
ABSTRACT:
According to the present invention, an FM signal is applied to a limiter through a signal input terminal to remove a noise element included in the FM signal. The limited FM signal is then supplied to a delay means for delaying the signal for a predetermined time. The delayed signal is then supplied to one of a pair of input terminals of a multiplying circuit. Either the limited FM signal or a reference potential is supplied to the other input terminal of the multiplying circuit. The multiplying circuit demodulates the FM signal which is then supplied to a low pass filter. The low pass filter transforms the demodulated signal into an analog signal which is then supplied to a signal output terminal.
REFERENCES:
patent: 4054840 (1977-10-01), Sato
patent: 4100500 (1978-07-01), Ohsawa et al.
patent: 4146842 (1979-03-01), Fukushima et al.
patent: 4232268 (1980-11-01), Hinn
patent: 4280100 (1981-07-01), Dann
patent: 4342000 (1982-07-01), Ogita
Denshi Tenbov, "Application of PLL IC Communicating System", Semiconductor Technical, Aug. 1972 pp. 92-97.
Okui Isamu
Yoshihisa Kozo
LaRoche Eugene R.
Paxman W. R.
Tokyo Shibaura Denki Kabushiki Kaisha
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