Signal enhancement device, method thereof, program, and recording medium
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United States of America Patent
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Sep 30, 2014
Grant Date -
Feb 24, 2011
app pub date -
Mar 5, 2009
filing date -
Mar 6, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
The initial values of parameter estimates are set, including reverberation parameter estimates, which includes a regression coefficient used in a linear convolutional operation for calculating an estimated value of reverberation included in an observed signal, source parameter estimates, which includes estimated values of a linear prediction coefficient and a prediction residual power that identify the power spectrum of a source signal, and noise parameter estimates, which include noise power spectrum estimates. Then, the maximum likelihood estimation is used to alternately repeat processing for updating at least one of the reverberation parameter estimates and the noise parameter estimates and processing for updating the source parameter estimates until a predetermined termination condition is satisfied.
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