Demodulators – Frequency modulation demodulator – Having specific distortion – noise or other interference...
Patent
1989-09-13
1991-02-12
Grimm, Siegfried H.
Demodulators
Frequency modulation demodulator
Having specific distortion, noise or other interference...
329327, 329343, 375 82, H03D 300, H03K 906
Patent
active
049927485
ABSTRACT:
An FM discriminator (34) which independently recovers modulating information from each half-cycle of a modulated waveform (16) is disclosed. The discriminator (34) includes a comparison circuit (36-42, 80-82) which produces bipolar signals describing positive and negative half-cycles of the modulated waveform (16). These bipolar signals are de-glitched (80, 82, 52, 54) for respective positive and negative counter circuits (44p, 44n). Each of the counter circuits (44) includes a counter (58) which counts a high speed clock signal supplied by a clock generator (46) during one of the half-cycles to produce a period count that describes the duration of the half-cycle. During a subsequent half-cycle, a translation circuit (60) converts the period count into an amplitude value that describes the information modulated onto the modulated waveform (16), and a resetting circuit (64-68) presets the counter (58) to an initial value. The counter circuits each additionally include an optional D/A converter (70) to provide an analog signal. Analog signals from the positive and negative counter circuits (44p, 44n) are combined in a multiplexer (48) to supply a single analog reconstruction of the modulating information.
REFERENCES:
patent: 3349328 (1967-10-01), Hunkins et al.
patent: 3377560 (1968-04-01), Renshaw
patent: 3454718 (1969-07-01), Perreault
patent: 3546486 (1970-12-01), Jacobson
patent: 3623075 (1971-11-01), Bench et al.
patent: 3632876 (1972-01-01), Bench
patent: 3665103 (1972-05-01), Watkins
patent: 3670250 (1972-06-01), Fritkin
patent: 4021744 (1977-05-01), Montefusco
patent: 4441193 (1984-04-01), Bell
patent: 4558284 (1985-12-01), Zaidenweber
patent: 4596022 (1986-06-01), Stoner
Atlantic Richfield Company
Grimm Siegfried H.
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