FM demodulator

Pulse or digital communications – Repeaters – Testing

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Details

329 50, 329112, H04L 2716

Patent

active

046758828

ABSTRACT:
A digital FM demodulator is described. According to the principles of the present invention, a digital FM signal is demodulated by processing sampled input vectors of a quadrature FM digital signal centered approximately zero frequency. The sampled quadrature input vectors are quantized to lie within a predetermined magnitude range. The quantized vectors are coupled to a phase accumulator which generates a current coarse phase value related to input vectors of the quadrature FM signal. The output of the phase accumulator is also coupled to a vector rotation means which rotates the input vector to a predetermined quadrant to determine a fine phase value based on said rotated input signal vector. The fine and coarse values are then summed and output as a composite phase value, and digitally filtered by subtracting the value of the previous composite phase angle sample from the value of the current composite phase angle sample to produce a demodulated message sample.

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patent: 4577157 (1986-03-01), Reed
"Communications Receivers of the Future", Frank P. Chiffy and Bjorn E. Bjerede, Signal, Nov./Dec. 1985, pp. 16-21.

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