Method and apparatus for reducing an undesirable characteristic

Details Method and apparatus for reducing an undesirable characteristic Method and apparatus for reducing an undesirable characteristic

1993-06-30

1998-01-20

MacDonald, Allen R.

395217, G10L 900

Patent

active

057108625

ABSTRACT:
An improved method and an apparatus for reducing an undesirable characteristic of a spectral estimate of a noise signal (203) between occurrences of voice signals (202) in an input signal (117). A spectrum of the input signal (117) is estimated to produce a spectral estimate (119) of the input signal (117) including the undesirable characteristic of the noise signal (203). The spectrum of the input signal (117) is smoothed over a first bandwidth (f3-f4) during the occurrences of the voice signals (203) and over a second bandwidth (f2-f5), substantially greater than the first bandwidth (f3-f4), between the occurrences of the voice signals (203). Alternatively, the spectral estimate (119) of the input signal (117) is filtered between the occurrences of the voice signals (203). Alternatively, the significance of magnitude and/or phase components of poles (301-305), representing the spectral estimate (119) of the input signal (117), between the occurrences of the voice signals (203) is reduced to produce a modified spectral estimate (120) of the input signal (117) between the occurrences of the voice signals (203).

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