Circuit for demodulating FSK signals

Details Circuit for demodulating FSK signals Circuit for demodulating FSK signals

1995-03-24

1996-01-09

Mis, David

Demodulators

Frequency shift keying or minimum shift keying demodulator

375334, 34082531, H03D 300, H04L 2700

Patent

active

054831938

ABSTRACT:
A circuit and method of demodulating an FSK signal uses digital circuitry to convert the received signal into count values. For each reception an adaptive reference count value is determined by averaging the duration of received pulses during the preamble of the transmission. The adaptive reference count corresponds to a demodulated logic "1" or logic level "0". The counts from the coded portion of the transmission are compared to the adaptive reference count. If the count is within predetermined windows from the reference count, the count value is converted to the corresponding digital signal.

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