Method and detection of phase and frequency modulation

Details Method and detection of phase and frequency modulation Method and detection of phase and frequency modulation

1976-12-10

1978-04-18

Griffin, Robert L.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

325363, 324 77B, 324 83A, H04B 1700

Patent

active

040853675

ABSTRACT:
There is disclosed a measurement and recording system having means for simultaneously displaying and recording the spectrum of a signal and the instantaneous phase of selected spectral components of the signal with respect to a local reference signal. Means are disclosed for displaying and recording the signal element lengths as a function of time. The system and method enables an analysis of digitally modulated signals of unknown modulation.
The system also provides a means to detect faults in the system equipment that may be generating signals having undesirable variations in phase, frequency, or amplitude.

REFERENCES:
patent: 3154741 (1964-10-01), Attwood
patent: 3526842 (1970-09-01), Andrew
patent: 3621388 (1971-11-01), Davis
patent: 3808528 (1974-04-01), Nugent et al.
patent: 3913013 (1975-10-01), Barley et al.
patent: 3992670 (1976-11-01), Gittins et al.

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