Demodulator for frequency shift keying signals

Details Demodulator for frequency shift keying signals Demodulator for frequency shift keying signals

1998-06-24

2000-12-12

Vo, Don N.

Pulse or digital communications

Receivers

Angle modulation

329300, H03D 300, H04L 2714

Patent

active

061608572

ABSTRACT:
Disclosed is a frequency shift keying (FSK) signal demodulator which demodulates binary data encoded in FSK format. A square wave generator generates a continuously repeating square wave signal by detecting zero-crossings of an FSK-modulated signal having a first frequency and a second frequency. The square wave signal is sampled at a sampling rate. A counter and its control circuit counts the number of the sampled signals during 1 bit data transmission time slots. A comparator compares the count number with two predetermined reference values and outputs the binary data.

REFERENCES:
patent: 4574247 (1986-03-01), Jacob
patent: 4785255 (1988-11-01), Lucak et al.
patent: 4897857 (1990-01-01), Wakatsuki et al.
patent: 5469112 (1995-11-01), Lee

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