Patent
1994-01-28
1997-08-12
MacDonald, Allen R.
395 242, G10L 302, G10L 900
Patent
active
056574223
ABSTRACT:
A method and apparatus for improving sound quality in a digital cellular radio system receiver. A voice activity detector uses an energy estimate to detect the presence of speech in a received speech signal in a noise environment. When no speech is present the system attenuates the signal and inserts low pass filtered white noise. In addition, a set of high pass filters are used to filter the signal based upon the background noise level. This high pass filtering is applied to the signal regardless of whether speech is present. Thus, a combination of signal attenuation with insertion of low pass filtered white noise during periods of non-speech, along with high pass filtering of the signal, improves sound quality when decoding speech which has been encoded in a noisy environment.
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Janiszewski Thomas John
Recchione Michael Charles
Dorvil Richemond
Lucent Technologies - Inc.
MacDonald Allen R.
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