Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-03-21
1976-10-05
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 9, 325 28, 340347AD, G01V 306
Patent
active
039847594
ABSTRACT:
An apparatus for measuring the deformation parameters of a periodic signal concealed in noise. The signal is transmitted by a transmitter controlled by a stable clock and received by a receiver also controlled by a stable clock of the same frequency as the one of the transmitter. The receiver comprises a detector for detecting the signal transmitted by the transmitter, means for resetting to a predetermined value the voltage detected by the detector at each integral number of cycles but at any particular time in the cycle, and an analog to digital converter connected to the detector for sampling the signal detected by the detector a predetermined number of times per cycle for converting the analog signal into a digital signal. A digit accumulator is connected to the output of the converter for accumulating the digital signals detected at corresponding sampling times in each cycle and a calculator is connected to the accumulator for determining the phase of the digital signal detected as compared to the signal transmitted by the transmitter and for evaluating therefrom the deformation parameters of the received signal.
REFERENCES:
patent: 3525037 (1970-08-01), Madden et al.
patent: 3679978 (1972-07-01), Hopkins
patent: 3701940 (1972-10-01), Nilsson
patent: 3849722 (1974-11-01), Nilsson
Gaucher Edwin
St-Amant Marcel
Soquem
Strecker Gerard R.
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