Method and apparatus for demodulating a frequency shift keyed si

Details Method and apparatus for demodulating a frequency shift keyed si Method and apparatus for demodulating a frequency shift keyed si

1996-12-02

1998-03-03

Mis, David

Demodulators

Frequency shift keying or minimum shift keying demodulator

Input signal combined with local oscillator or carrier...

329303, 375325, 375328, 375335, H03D 300, H04L 2714

Patent

active

057240019

ABSTRACT:
A receiver (100) is utilized for demodulating a multi-level frequency shift keyed (FSK) signal. The receiver (100) includes a mixer (102) for mixing the multi-level FSK signal to generate an in-phase signal and a quadrature signal, and a demodulator circuit (110) coupled to the mixer (102). The demodulator circuit (110) is adapted to count a sequence of state transitions of the in-phase signal and the quadrature signal and to determine a frequency deviation of the multi-level FSK signal based on the sequence of state transitions counted.

REFERENCES:
patent: 5453715 (1995-09-01), Lee
patent: 5640428 (1997-06-01), Abe et al.

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