Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1983-06-23
1986-02-11
LaRoche, Eugene R.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329110, 329126, 329145, 375 82, 455214, H03D 300
Patent
active
045701261
ABSTRACT:
For determining the half-cycle durations of the input signal which is presented as a sequence of sampled values, its zero crossings are approximated by lines which interconnect the two sampled values of different signs on both sides of the zero crossing. The half-cycle duration is derived from the number of sampled values within a period, i.e. between two consecutive zero crossings, and from the time intervals at the beginning and end of each half-cycle determined by the intersection of the approximation line with the axis. The time intervals at the beginning and end of each period are corrected for a more accurate determination of the duration and the time intervals during which the values of the individual half-cycle durations are stored, are made to approximate to these half-cycle durations. The instantaneous frequency of the input signal is determined from the values of the half-cycle durations which have thus been shifted in time by forming the reciprocal.
REFERENCES:
patent: 4021744 (1977-05-01), Montefusco
patent: 4412339 (1983-10-01), Alfke et al.
Bergs Norbert A.
Demmer Walter H.
Gutsmann Rolf D.
Heinemann Ingolf B.
Warmuth Otto L.
Briody Thomas A.
Goodman Edward W.
LaRoche Eugene R.
Mis D. C.
Streeter William J.
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