A review on speech enhancement techniques

In this paper, we review speech enhancement techniques. Speech enhancement is necessary for many applications in which clean speech signal is important for further processing. The speech enhancement techniques mainly focus on removal of noise from speech signal. The various types of noise and techniques for removal of those noises are presented in this paper. Most widely used speech enhancement technique namely, spectral subtraction method is reviewed in this paper with its state-of-art for better noise cancellation.