Signal detection using maximum a posteriori likelihood and noise spectral difference
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United States of America Patent
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Jan 6, 2009
Grant Date -
Jun 16, 2005
app pub date -
Dec 9, 2004
filing date -
Dec 16, 2003
priority date (Note) -
Expired
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Abstract
Robust signal detection against various types of background noise is implemented. According to a signal detection apparatus, the feature amount of an input signal sequence and the feature amount of a noise component contained in the signal sequence are extracted. After that, the first likelihood indicating probability that the signal sequence is detected and the second likelihood indicating probability that the noise component is detected are calculated on the basis of a predetermined signal-to-noise ratio and the extracted feature amount of the signal sequence. Additionally, a likelihood ratio indicating the ratio between the first likelihood and the second likelihood is calculated. Detection of the signal sequence is determined on the basis of the likelihood ratio.
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