Demodulators – Frequency shift keying or minimum shift keying demodulator – Input signal combined with local oscillator or carrier...
Patent
1992-09-28
1994-05-03
Mis, David
Demodulators
Frequency shift keying or minimum shift keying demodulator
Input signal combined with local oscillator or carrier...
329303, 375 80, 375 88, H03D 300
Patent
active
053091132
ABSTRACT:
An FSK demodulator for demodulating first and second baseband signals obtained from a received frequency shift keying signal, the first and second baseband signals having a quadrature relation therebetween, a lead and lag relation between the first and second baseband signals being changed in accordance with frequency shift from a carrier frequency of the frequency shift keying signal, comprises: a voltage change judging circuit for judging whether a magnitude of the first baseband signal increases or decreases within a predetermined interval; and an inverting circuit responsive to an output of the voltage change judging circuit and the second baseband signal for outputting a demodulated signal produced by inverting the second baseband signal in accordance with the output of the voltage change judging circuit. In addition, a second voltage change judging circuit and a second inverting circuit and a combining circuit for combining the results of said first and second inverting circuits may be provided to improve noise resistance. Inflection points in the baseband signal are detected to select one output from the first, second inverting circuit and the combining circuit in accordance with detection of the inflection points.
REFERENCES:
patent: 2652451 (1953-09-01), Feten
patent: 3439283 (1969-04-01), Danielson
patent: 3568067 (1971-03-01), Williford
patent: 4359691 (1982-11-01), Robson
patent: 4618967 (1986-10-01), Vance et al.
patent: 5023562 (1991-06-01), Gumussoy
Harada Hiroyuki
Hasegawa Makoto
Mimura Masahiro
Watanabe Kazunori
Matsushita Electric - Industrial Co., Ltd.
Mis David
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