Digital signal receiving apparatus

Pulse or digital communications – Receivers – Particular pulse demodulator or detector

Reexamination Certificate

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Reexamination Certificate

active

08050364

ABSTRACT:
A digital signal receiving apparatus includes: detection-judging portion judging a possible presence of a desired signal when a signal level of a smoothed signal is greater than a reference level; wherein said first smoothed signal and said second smoothed signal are compared in order to generate a detection signal representing a judgment of a possible presence of a desired signal, said second smoothed signal having a convergence speed slower than that of the first smoothing filter, a filter controlling portion switching an adaptive filter from an adaptive mode to a non-adaptive mode when the detection-judging portion judges the possible presence of the desired signal and switching from the non-adaptive mode to the adaptive mode when the detection-judging portion judges the absence of the desired signal; a limiting portion limiting a signal level of an auto-correlation signal to the signal level of the smoothed signal; and a demodulating portion demodulating the auto-correlation signal having the signal level limited by the limiting means so as to generate a demodulated signal, wherein the input to the demodulator is limited to the level of a smoothed signal, said smoothed signal being generated from the input of the detection judging portion.

REFERENCES:
patent: 2007/0201588 (2007-08-01), Loiseau et al.
patent: 2009/0129523 (2009-05-01), Yamamoto et al.
patent: 2 859 336 (2004-03-01), None
patent: 2001004736 (2001-01-01), None
patent: 2005-045314 (2005-02-01), None

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