Digital FSK demodulator with automatic offset cancellation

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

1994-08-25

1995-07-25

Mis, David

Demodulators

Frequency shift keying or minimum shift keying demodulator

Including logic element (e.g., logic gate or flip-flop

375317, 375334, H03C 300, H04L 2714

Patent

active

054365902

ABSTRACT:
A digital FSK demodulator used in e.g. a telephone loop 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 offset cancellation in which peak amplitudes of digital 0 and digital 1 signals are continuously monitored. The peak amplitudes are then averaged to obtain an offset estimation which is subtracted from the output of the demodulator for offset compensation.

REFERENCES:
patent: 3473131 (1969-10-01), Perkins, Jr.
patent: 4631737 (1986-12-01), Davis et al.
patent: 4679209 (1987-07-01), Hogeboom et al.
patent: 5155446 (1992-10-01), Eberle et al.
patent: 5222078 (1993-06-01), Cason et al.
"IBM Technical Disclosure Bulletin", vol. 20, No. 2, Jul. 1977, Data Demodulator Circuit Arrangement, p. 769, Fiehmann et al.

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