Estimation of Noise Spectrum and its Application to SNR-Estimation and Speech Enhancement

TitleEstimation of Noise Spectrum and its Application to SNR-Estimation and Speech Enhancement
Publication TypeTechnical Report
Year of Publication1993
AuthorsHirsch, H-G.
Other Numbers800
Abstract

One possible solution to improve recognition of noisy speech is the application of noise reduction techniques. Spectral subtraction is one well known technique to reduce stationary background noise in case of recording with a single microphone. An estimation of the noise spectrum is necessary to apply this method. The determination of segments containing just noise is usually a difficult task. This report describes a method to estimate the noise spectrum without the need of distinguishing between segments of noisy speech and segments of pure noise. The estimation of noise power inside one subband is based on an analysis of the histogram of a certain number of past short-term energy values inside this subband. This technique for estimating the noise spectrum can be used to estimate the actual signal-to-noise ratio (SNR). Another application is the integration inside a spectral subtraction technique for speech enhancement.

URLhttp://www.icsi.berkeley.edu/ftp/global/pub/techreports/1993/tr-93-012.pdf
Bibliographic Notes

ICSI Technical Report TR-93-012

Abbreviated Authors

H.-G. Hirsch

ICSI Publication Type

Technical Report