Digital FSK transmitter receiver and method of operating same

Details Digital FSK transmitter receiver and method of operating same Digital FSK transmitter receiver and method of operating same

1991-08-30

1994-05-10

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 82, 329303, H04L 2714

Patent

active

053115562

ABSTRACT:
A digital FSK receiver includes a zero-crossing detector which detects the zero crossings in an FSK signal having at least two signal frequencies. The time interval between zero crossings is then measured with a first interval value corresponding to one of the signal frequencies and a second interval value corresponding to the other signal frequency. An accumulator outputs a digital signal which depends on whether the interval is at the first value or the second value, the digital signal including logical zeros and ones.

REFERENCES:
patent: 4115738 (1978-09-01), Mitarai et al.
patent: 4485347 (1984-11-01), Hirasawa et al.
patent: 4551846 (1985-11-01), Takeda et al.
patent: 4627078 (1986-12-01), Stoner
patent: 4785255 (1988-11-01), Lucak et al.
patent: 5105444 (1992-04-01), Gard

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