Pre emphasis filter in MFCC

2013 3 23
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The pre emphasis filter is like this:
Y [n] = X [n] -0 . 95 x[n - 1]
What is n here?

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Wayne King
Wayne King 2013-3-23
编辑：Wayne King 2013-3-23

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n is the just the "time" index of the discrete-time signal (in this case a speech signal). You can implement this filter in MATLAB as just
B = [1 -0.95];
y = filter(B,1,x);
where x is the input signal (speech waveform).

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