Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1977-12-23
1979-03-20
Heyman, John S.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
328140, 328153, 328207, 329107, H03K 906
Patent
active
041456602
ABSTRACT:
Frequency-activated channel selector having means to increase and to decrease the lower boundary frequency of a selected channel. When the channel selector couples an input signal to a particular channel, depending on the frequency of the input signal, the lower boundary for that channel is decreased to a lower value. When the frequency of the input signal drops to or below the lower value of the lower boundary, the lower boundary frequency is increased to a higher value. This hysteresis effect eliminates anomalous channel selection behavior when the input frequency is at the channel boundaries.
REFERENCES:
patent: 3638038 (1972-01-01), Weber
patent: 3769596 (1973-10-01), Peersch
patent: 3943382 (1976-03-01), Hermansdorfer et al.
patent: 3958183 (1976-05-01), Schaefer
patent: 3976948 (1976-08-01), Dearden et al.
patent: 4002990 (1977-01-01), Runey
patent: 4024414 (1977-05-01), Gurry
patent: 4097812 (1978-06-01), Rzeszewski
Electronic Design 8, Apr. 15, 1971, "Digital IC Tone Detector Responds Immediately to inputs" by Femling.
Electronics, Apr. 24, 1972, "One-Shot/Flip-Flop Pairs Detect Frequency Bands" by Pearson.
Allen Richard W.
Jackson, III Alexander
Christoffersen H.
Cohen Samuel
Heyman John S.
RCA Corporation
Wright Carl M.
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