Speech Enhancement Using Super Soft Thresholding in Wavelet Domain

Speech is being a fundamental way of communication among human beings. In many unavoidable situations, unwanted background noises are added to the speech signal. The proposed speech enhancement technique is to remove the background noise and to improve the quality of the speech signal. Noisy signal are decomposed by wavelet decomposition technique. Super soft thresholding technique is applied to the decomposed signal to remove the background noise. The thresholded signal can be reconstructed by wavelet reconstruction technique. The performance of the noisy signal and denoised signal can be measured using SNR (Signal to Noise Ratio). The proposed super soft thresholding algorithm can achieve better performance, when compared to hard or soft thresholding algorithm. Keywords— Decomposition; Reconstruction; SNR; Speech signal; Super soft Thresholding.