Local peak weighted-minimum mean square error (LPW-MMSE) estimation for robust speech
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United States of America Patent
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Nov 17, 2015
Grant Date -
Sep 12, 2013
app pub date -
Mar 6, 2013
filing date -
Mar 7, 2012
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Abstract
A system and method for noise reduction applied to a speech recognition front-end. An output of a front-end is optimized by giving, as a weight to the output for each band, a confidence index representing the remarkableness of the harmonic structure of observation speech. In a first method, when clean speech is estimated by executing MMSE estimation on a model that gives a probability distribution of noise-removed speech generated from observation speech, the posterior probability of the MMSE estimation is weighted using the confidence index as a weight. In a second method, linear interpolation is executed, for each band, between an observed value of observation speech and an estimated value of clean speech, with the confidence index serving as a weight. The first method and the second method can be combined.
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