Mfcc.c
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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.

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Begin

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


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