H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/15
H03D 3/18 (2006.01) H03D 13/00 (2006.01) H04L 27/14 (2006.01)
Patent
CA 1157534
47 WIDEBAND DIGITAL FREQUENCY DISCRIMINATOR AND PHASE AND FREQUENCY DETECTOR ABSTRACT A wideband digital discriminator for demodulating an FM signal is disclosed. An incoming FM signal cycles a counter through a series of sequential nonambiuous cyclical states A timer is provided for producing a reference signal having a known relationship to the center frequency of the FM signal. First and second latches, synchronous with the timing means, are provided for sampling and storing information about the present and immediately preceding output states of the counter. A detector, operated synchronously with the reference signal, detects differences in magnitude and direction between the present and immediately preceding sampled states of the counter and generates an output signal when a state difference is detected. The output signal can be digitally processed or integrated over time to provide an analog discriminator output.
355612
Kirby Eades Gale Baker
Raytheon Company
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