Demodulators – Frequency shift keying or minimum shift keying demodulator – Including logic element (e.g. – logic gate or flip-flop
Patent
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.
Ross William T.
Simard J. M. A. Frederic
Mis David
Northern Telecom Limited
Toyooka Yoshiharu
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