Voice band extender separately extending frequency bands of an extracted-noise signal and a noise-suppressed signal
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United States of America Patent
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Apr 30, 2013
Grant Date -
Mar 31, 2011
app pub date -
Aug 5, 2010
filing date -
Sep 29, 2009
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Abstract
A voice band extender includes a component separator for receiving a band-limited speech signal over a telecommunications line to separate the speech signal into a noise-suppressed signal and an extracted-noise signal, a noise-suppressed signal component extender for adding a signal having its frequency band higher than that of the noise-suppressed signal to thereby produce an extended noise-suppressed signal, an extracted-noise signal component extender for producing an extended extracted-noise signal, a signal intensity adjuster for adjusting signal intensity of either or both of the extended noise-suppressed signal and the extended extracted-noise signal, and a synthesizer for combining the extended noise-suppressed signal and the extended extracted-noise signal obtained by the intensity adjustment. The respective frequency bands of the extracted-noise signal and the noise-suppressed signal are thus extended.
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