Patent
1994-08-10
1998-04-21
MacDonald, Allen R.
395 228, 395 238, 395 291, G10L 914
Patent
active
057427348
ABSTRACT:
It is a first objective of the present invention to provide a method by which to reduce the probability of coding low energy unvoiced speech as background noise. The present invention determines an encoding rate by examining subbands of the input signal, by this method unvoiced speech can be distinguished from background noise. A second objective of the present invention is to provide a means by which to set the threshold levels that takes into account signal energy as well as background noise energy. In the present invention, the background noise is not used to determine threshold values, rather the signal to noise ratio of an input signal is use to determine the threshold values. A third objective of the present invention is to provide a method for coding music passing through a variable rate vocoder. The present invention examines the periodicity of the input signal to distinguish music from background noise.
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DeJaco Andrew P.
Gardner William R.
English Sean
Golden Linli L.
MacDonald Allen R.
Miller Russell B.
Qualcomm Incorporated
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