Fully integrated digital FM discriminator

Details Fully integrated digital FM discriminator Fully integrated digital FM discriminator

1989-08-31

1991-01-15

Pascal, Robert J.

Demodulators

Frequency modulation demodulator

Input signal split into plural signals

329336, 329341, H03D 100

Patent

active

049856847

ABSTRACT:
A single substantially non-programmable fully integrated circuit for a digital frequency modulated discriminator is provided whereby frequency variations of a digitized frequency modulated information signal are linearly converted to amplitude variations. Matched pairs of data words from the digitized information signal are used to obtain a phase octant, one of eight equal sectors of the 360 degree spectrum. Further manipulations of the pairs of data words provide a coarse phase measurement, being some integral multiple of .pi./2, and a fine phase correction factor less than or equal to .pi./4 radians. The coarse phase measurement is combined with the fine phase correction factor. The sum is differentiated and demodulated, yielding the original information signal.

REFERENCES:
patent: 4675882 (1987-06-01), Lillie et al.

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