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  1. mfcc.c begin • Initial MFCC • hamming window table • FFT table • triangular filter bank coefficients • Low upper freq • space • center freq • magnitude response • all channels • upper and lower triangle • Read first 20 ms data • read data to buffer • remove dcbias • pre-emphasis Nframe Nframe>Total_frame 1 0 Shift data in buffer by 10 ms • Read the 10 ms data • read data to buffer • remove dcbias • pre-emphasis • Feature extraction • all samples in buffer (30 ms) • add hamming window • zero appending • FFT transform • Filter-bank log energy • all channels • all upper and lower • sides • get sum of • energy and log (sum) • Get mel-ceptrum coefficient • for 12 order • take DCT for feature • write out Get the log energy coefficient from all data frame in buffer end