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Pre-emphasis-- high pass filtering (the effect is to suppress low frequency) To reduce noise average transmission conditions and to average Signal spectrum. S(n=s(n)-as(n-1) 0. 9sas1.o, typically a=0.95 ForS(0)S(1),S(2)2, the value s(O)does not exist and is never used a= pre-emphasIs constant Feature extraction v 9aPre-emphasis -- high pass filtering (the effect is to suppress low frequency) • To reduce noise, average transmission conditions and to average signal spectrum. pre emphasis constant ~ the value (0) does not exist and is never used. For (0), (1), (2),.., 0.95 ~ 1.0,typically ~ 0.9 ( 1) ~ ( ) ( ) ' ' = −   = = − − a S S S S a a S n S n aS n Feature extraction, v.9a 20
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