Digital signal receiving apparatus

Details Digital signal receiving apparatus Digital signal receiving apparatus

2008-11-13

2011-11-01

Payne, David C. (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

Reexamination Certificate

active

08050370

ABSTRACT:
A digital signal receiving apparatus includes a detection-judging portion having a first smoothing filter generating a first smoothed signal by smoothing an auto-correlation signal and judging a possible presence of a desired signal when a signal level of the first smoothed signal is greater than a reference level and an absence of the desired signal when being smaller than the reference level. The smoothing filter includes a limiting portion limiting a fluctuation width of the first smoothed signal; and an adjusting portion configured to adjust the fluctuation width of the first smoothed signal limited by the limiting portion to be reduced while an elapsing time after the detection-judging means judges the possible presence of the desired signal is increasing.

REFERENCES:
patent: 2007/0201588 (2007-08-01), Loiseau et al.
patent: 2009/0129520 (2009-05-01), Yamamoto et al.
patent: 2 859 336 (2005-03-01), None
patent: 2001-4736 (2001-01-01), None
patent: 2005-45314 (2005-02-01), None

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