Noise suppression and channel equalization preprocessor for speech and speaker recognizers: method and apparatus
US6266633A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1998 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Dec 22, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/0208
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for performing noise suppression and channel equalization of a noisy voice signal comprising the steps of sampling the noisy voice signal at a predetermined sampling rate f.sub.s ; segmenting the sampled voice signal into a plurality of frames having a predetermined number of samples per frame, over a predetermined temporal window; generating an N-point spectral sample representation of each of the sample signal frames; determining the magnitude of each of the N-point spectral samples and generating a histogram of the energy associated with each of the N-point spectral samples at a particular frequency; detecting a peak amplitude of the histogram which corresponds to a noise threshold N.sub.f associated with the particular frequency; determining a channel frequency response C.sub.f associated with the particular frequency by determining a geometric mean over all the spectral samples having magnitude exceeding the noise threshold N.sub.f ; subtracting from each of the magnitudes of the N point spectral samples the noise threshold N.sub.f to provide a noise suppressed sample sequence; applying blind deconvolution to the noise suppressed samples; transforming the deconvolved …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.