Method and apparatus for quickly detecting a presence of...

Pulse or digital communications – Systems using alternating or pulsating current – Antinoise or distortion

Reexamination Certificate

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C375S346000, C455S296000, C704S226000

Reexamination Certificate

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07873114

ABSTRACT:
An apparatus (100) and method (200) for detecting the presence of abrupt noise is provided. The method can include estimating (210) a subband energy of the signal, calculating (220) a peak-to-peak energy difference (345), and calculating (230) a spectrum deviation (426). A request to update a noise channel estimate can be declared if a) a total estimated channel energy is greater than a predetermined noise floor (442), and b) the spectrum deviation is less than a predetermined variance threshold (444), and c) the peak-to-peak energy difference is less than a predetermined peak-to-peak threshold (446), or d) if a voice metric is less than a voice level threshold (448).

REFERENCES:
patent: 5659622 (1997-08-01), Ashley
patent: 5809455 (1998-09-01), Nishiguchi et al.
patent: 6366880 (2002-04-01), Ashley
patent: 6868378 (2005-03-01), Breton
patent: 2004/0102967 (2004-05-01), Furuta et al.
patent: 2008/0281589 (2008-11-01), Wang et al.
Cohen, “Speech Enhancement For Non-Stationary Noise Environments,” Signal Processing 81, 2001, pp. 2403-2418.

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