Analog-to-digital converter/demodulator for FM signals

Details Analog-to-digital converter/demodulator for FM signals Analog-to-digital converter/demodulator for FM signals

1983-08-08

1986-06-03

Shaw, Clifford C.

Communications: electrical

Audible indication

Percussion-type sound producer

328112, 328140, 329106, H04L 2714

Patent

active

045932662

ABSTRACT:
An analog-to-digital converter/demodulator consists of n delay elements, each of which has a delay period longer than a preceding delay element by a fixed amount, and n pulse coincidence detectors. A ONE-SHOT responsive to the FM signal generates a pulse for each zero crossing of the FM signal, which pulses are applied to one input of each detector and to the input terminals of the n delay elements. The output terminals of the delay elements are coupled to respective second input terminals of the coincidence detectors. The output terminals of the coincidence detectors are applied to a DECODER which provides a binary output signal corresponding to the instantaneous frequency defined by the period between successive pulses i.e., between successive zero crossings.

REFERENCES:
patent: 3548328 (1969-01-01), Breikss
patent: 3624523 (1971-11-01), Katz
patent: 3670250 (1972-06-01), Fritkin
patent: 3944935 (1976-03-01), Plant
patent: 4061976 (1977-12-01), Sugai
patent: 4313103 (1982-01-01), Shull
J. Muramatsu et al. "6-Bit A-D Chip Steps Up the Page of Signal Processing", Electronic Design, 9/16/82, pp. 89-97.
Crochiere et al. "Interpolation and Decimation of Digital Signals--A Tutorial Review" Proc. IEEE, vol. 69, No. 3, 3/83, p. 300.

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