Frequency shift keyed demodulator

Details Frequency shift keyed demodulator Frequency shift keyed demodulator

1983-01-13

1986-09-16

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 329145, 375 88, 375 94, H04L 2714

Patent

active

046125094

ABSTRACT:
This invention relates to a demodulator for an FSK signal having a baud rate which is independent of the signal's bandwidth. The demodulator multiplies the received FSK signal with two quadrature signals having a frequency which lies between the two frequencies of the FSK signal, to obtain the real and imaginary components of a phasor. The phasor rotates in the complex plane, the direction of the rotation depending on whether the frequency of the quadrature signals is above or below the frequency of the received signal. The demodulator determines the direction of rotation of the phasor and generates binary data corresponding to the frequency change in the FSK signal.

REFERENCES:
patent: 3568067 (1971-03-01), Williford
patent: 4031669 (1977-06-01), Koide et al.
patent: 4193033 (1980-03-01), Voorman
patent: 4344178 (1982-08-01), Waters
patent: 4506228 (1985-03-01), Kammeyer

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