H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/16
H03D 3/00 (2006.01)
Patent
CA 1204827
23 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 too by lines which interconnect the from sampled values of different sign 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 cross- ings, 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.
431052
Bergs Norbert A.
Demmer Walter H.
Gutsmann Rolf-Dieter
Heinemann Ingolf B.
Warmuth Otto L.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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