Digital FSK demodulator with offset cancellation

Details Digital FSK demodulator with offset cancellation Digital FSK demodulator with offset cancellation

1994-02-17

1995-02-28

Grimm, Siegfried H.

Demodulators

Frequency shift keying or minimum shift keying demodulator

375317, 375324, 375334, H04L 2714

Patent

active

053941098

ABSTRACT:
A digital FSK demodulator includes a quadrature phase detector for detecting space and mark tones used in FSK signals. Due to its inherent characteristics, a telephone loop in which the demodulator is used produces unequal amplitudes in detected mark and space tones. The inequality or offset must be cancelled so that a proper timing signal can be recovered from the FSK signal. The demodulator includes a digital compensation circuit for off-hook and on-hook offset cancellation.

REFERENCES:
patent: 5053717 (1991-10-01), Schulz et al.
patent: 5155446 (1992-10-01), Eberle et al.

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