FSK signal demodulation circuit

Details FSK signal demodulation circuit FSK signal demodulation circuit

2008-05-06

2008-05-06

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S303000, C375S308000, C375S329000

Reexamination Certificate

active

07369629

ABSTRACT:
A demodulation circuit for demodulating an FSK signal comprising a long bit having a long bit period and a short bit having a short bit period comprises a bit boundary detection section for detecting a bit boundary timing of each bit, and a bit determination section for making determination for each bit such that a particular bit is determined to be a long bit when a threshold time period has passed during a period from a bit boundary timing at a leading end of the bit to a bit boundary timing at a trailing end of the bit, and a particular bit is determined to be a short bit when the threshold time period has not passed during a period from a bit boundary timing at a leading end of the bit to a bit boundary timing at a trailing end of the bit.

REFERENCES:
patent: 4013965 (1977-03-01), Scharfe, Jr.
patent: 4485347 (1984-11-01), Hirasawa et al.
patent: 4499425 (1985-02-01), Maas
patent: 5483193 (1996-01-01), Kennedy et al.
patent: 5684837 (1997-11-01), Chen
patent: 5783967 (1998-07-01), Takaya
patent: 6933776 (2005-08-01), Huang et al.
patent: 9-294143 (1997-11-01), None
English Patent Abstract for 9-294143 from esp@cenet, published Nov. 11, 1997.

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