Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
2004-09-13
2008-11-18
Hudspeth, David R. (Department: 2626)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
C702S190000, C704S224000, C704S278000, C706S020000
Reexamination Certificate
active
07454333
ABSTRACT:
A method according to the invention separates multiple audio signals recorded as a mixed signal via a single channel. The mixed signal is A/D converted and sampled. A sliding window is applied to the samples to obtain frames. The logarithms of the power spectra of the frames are determined. From the spectra, the a posteriori probabilities of pairs of spectra are determined. The probabilities are used to obtain Fourier spectra for each individual signal in each frame. The invention provides a minimum-mean-squared error metho or a soft mask method for making this determination. The Fourier spectra are inverted to obtain corresponding signals, which are concatenated to recover the individual signals.
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Ramakrishnan Bhiksha
Reddy Aarthi M.
Brinkman Dirk
Hudspeth David R.
Mitsubishi Electric Research Lab, Inc.
Mueller Clifton D.
Rider Justin W
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