Digital FSK receiver using double zero-crossing

Details Digital FSK receiver using double zero-crossing Digital FSK receiver using double zero-crossing

1995-12-22

1997-08-26

Tse, Young T.

Pulse or digital communications

Receivers

Angle modulation

395 222, H04L 2714

Patent

active

056617593

ABSTRACT:
The present invention relates to a digital frequency shift keyed (FSK) signal receiver comprised of a band-pass filter having passbands corresponding to each modulation frequency of an FSK signal, for receiving and translating the FSK signal, a first zero crossing detector for receiving the translated signal and for generating a value signal having a higher or lower value during a 1 logic bit of the translated signal, and an opposite lower or higher value during a 0 logic bit of the translated signal, a second zero crossing detector for receiving the value signal and for outputting groups of 1's and groups of 0's, the group lengths depending on intervals between the higher and lower values.

REFERENCES:
patent: 4466106 (1984-08-01), Serrano
patent: 4517519 (1985-05-01), Mukaiyama
patent: 4551846 (1985-11-01), Takeda et al.
patent: 4633488 (1986-12-01), Shaw
patent: 5103463 (1992-04-01), Schoeneberg
patent: 5164965 (1992-11-01), Karaali
patent: 5311556 (1994-05-01), Baker

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