Method based on pitch-strength for reducing noise in predetermin

Details Method based on pitch-strength for reducing noise in predetermin Method based on pitch-strength for reducing noise in predetermin

1996-06-24

1998-09-22

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704227, 381 143, G10L 300, H04B 1500

Patent

active

058129707

ABSTRACT:
A method for reducing noise in a speech signal by controlling suppression of a predetermined band when an input speech signal has a large pitch strength. The noise reduction method is to be used in an apparatus having a signal characteristic calculating unit, an adjustment calculating unit 32, a consonant component valve (CE) and relative noise level value calculating unit, a prefilter or Hn value calculating unit, and a spectrum correcting unit as main components. The signal characteristic calculating unit derives a pitch strength of the input speech signal. The adjustment calculating unit derives an adjustment value according to the pitch strength. The CE and NR value calculating unit derives an NR value according to the pitch strength. Then, the Hn value calculating unit derives the Hn value according to the NR value and sets a noise suppression rate of the input speech signal. The spectrum correcting unit 10 reduces the noise of the input speech signal based on the noise suppression rate.

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