Frequency demodulator circuit with zero-crossing counter

Details Frequency demodulator circuit with zero-crossing counter Frequency demodulator circuit with zero-crossing counter

1986-07-15

1987-11-17

Laroche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329126, 329145, 375 80, 455214, H03D 300

Patent

active

047076666

ABSTRACT:
A digital frequency demodulator circuit works on the principle of determining the number of zero crossings of a band-limited input signal in a given period of time, in corresponding prior art analog circuits. The circuit includes an analog-to-digital converter, three delay elements, two edge detectors, an up/down counter, two arcsin read-only memories, a 1/2 multiplier and a multiple adder.

REFERENCES:
patent: 4378526 (1983-03-01), Champagne et al.
patent: 4634989 (1987-01-01), Mehrgardt
Patent Abstracts of Japan, Band 6, No. 21 (E-14 93), [899], Feb. 6, 1982; JP-A-56 140 706 (Nipon Denshin Denwa Kosha), 04-11-1981.
IBM Technical Disclosure Bulletin, vol. 13, No. 11, Apr. 1971, pp. 3421-3422, New York, U.S.; G. D. Jones Jr.: "Digital Frequency Discriminator".
RCA Technical Notes, No. 839, Jun. 4, 1969, pp. 1/2-2/2, RCA, Princeton, New York, U.S.; D. P. Webster et al.: "Correlation Data Demodulator".

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