Digital frequency process and method using frequency shifting te

Details Digital frequency process and method using frequency shifting te Digital frequency process and method using frequency shifting te

1978-09-11

1980-10-28

Smith, Alfred E.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

328168, 32478R, 368119, H04B 102

Patent

active

042309913

ABSTRACT:
A programmable number of pulses N, of one or more auxiliary frequencies fa, is inserted between pulses of the frequency f.sub.1 to be processed. The resulting frequency N.f.sub.1, where N is a positive number (N can be fractional), is at any moment proportional to input frequency f.sub.1 where N, the proportionality factor, varies at will and can assume any positive number value. Pulse insertion results in a frequency shift of positive or negative value and succeeds continuously and without any information loss i.e. the pulse train has not to be interrupted and is processed "on (the) line". The same method described used for higher frequencies eliminates the known .+-.1 count problem as it can register fractions of a pulse.

REFERENCES:
patent: 4107600 (1978-08-01), McMannis
Howlick and Bertolucci, "A New Type of Digital Frequency Multiplier," Proceedings of IEEE, Sep. 1975, p. 1365.
Gimmel, "A Digital Method of Frequency Multiplication and its Application to Numeric Spectrum Analysis of Periodic Signals," IEEE, Jun. 1977, pp. 181-183.
Gimmel, "An Improved Type of Digital Frequency Multiplier Circuits and Systems," May, 1977.
Fichtenbaum "Counter Inverts period to measure low frequency Electronics," Mar. 4, 1976, pp. 100-101.

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