Phase Estimation in speech enhancement

1. What are the speech enhancement techniques?
2. What do you mean by speech enhancement?

What are the speech enhancement techniques?

A number of speech enhancement techniques have been reported in the literature [32]. They include spectral subtraction [33, 34, 41], Wiener and Kalman filtering [35], MMSE estimation [36], comb filtering [32], subspace methods [37, 38], and phase spectrum compensation [39, 40].

What do you mean by speech enhancement?

Speech enhancement aims to improve speech quality by using various algorithms. The objective of enhancement is improvement in intelligibility and/or overall perceptual quality of degraded speech signal using audio signal processing techniques.