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Application of subspace decomposition approach in speech en hancement system

LUO Huai-en,RONG Tai-ping  
A subspace decomposition approach is presented for suppression of wideband noise in speech en hancement.A method of Speech/Nonspeech Decision in Low SNR Environment has been used to accurately esti mate the noise characteristics.By applying the Karhunen-Loeve Expansion,we decompose the noisy speech into signal subspace and noise subspace.Enhancement is performed by re-moving the noise subspace and estimating the clean signal from the remaining signal subspace.These tests show that the proposed method not only effectively suppresses the wideband noise but also re-moves the musical noise,even if no prior information is given about the noise characteristics or noise level.[
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