Topic Speech enhancement
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http://en.wikipedia.org/wiki/Wiener_filter
Based on the link and the attachment PDF file, write a 10pages essay， the framework of the essay should be like the following ：
Topic Speech enhancement
① Back ground
②Utilization
③How it works
Characters of speech signal(random, change overtime, unstable)
Ear → machine Cover effect—how human ear can distinguish speech signal in noisy environment
Interference: (noise ＆ stable interference) –characteristics
Ways of speech enhancement
1 Based on time domain
a.Linear prediction analysis—estimate parameter of model –combining clean speech signal
b.Only use the parameter of sound
Wiener filtering —-replenish—-Kalman filtering eta(t)=s(t)+n(t) (mean-square deviation least ) e(n)=s(n)-s’(n)→E[e2(n)]=E[（S-S’）2]
Based on all data in the past and the current data by watch—estimate current value
6.Kalman filtering
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