1974-12-30
1976-07-13
Griffin, Robert L.
325 62, 325137, 325330, H04B 168
Patent
active
039696758
ABSTRACT:
A single side-band electrical information-transmission system is described in which the correct oscillator frequency for demodulation in the receiver is achieved by attenuating a narrow band of audio frequencies in the transmitter and automatically correcting demodulation in the receiver in accordance with the position in the frequency spectrum of this band after demodulation. Attenuation in the transmitter is carried out by a band-stop filter, and the receiver usually includes two band-pass filters, connected in parallel following the demodulator. The output from the filters is individually rectified, summed, and smoothed before being used as an automatic frequency control signal to correct the frequency of the oscillator coupled to the demodulator.
REFERENCES:
patent: 3004104 (1961-10-01), Hembrooke
patent: 3271681 (1966-09-01), McNair
patent: 3271682 (1966-09-01), Bucher, Jr.
patent: 3274492 (1966-09-01), Van Kessel et al.
patent: 3377559 (1968-04-01), Stewart
patent: 3437941 (1969-04-01), Leary
patent: 3458815 (1969-07-01), Becker
patent: 3543164 (1970-11-01), Mayefskie et al.
patent: 3582788 (1971-06-01), Castagna
Griffin Robert L.
National Research Development Corporation
Ng Jin F.
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