mfcc-master.zip

# mfcc MFCC extraction algorithm implmentation for older versions of MATLAB (pre-2018). ### Function description The MATLAB function file _mfcc.m_ implements the mel-frequency cepstral coefficients (MFCC) extraction algorithm. Function usage: ``` y = mfcc(x, Tw, Tstep, Fs, window, Flow, Fhigh, Nfilt, Nmfcc, p, D, replC0) ``` A description for all variables involved is given below: * OUTPUT: - y = MFCC matrix; size(y) = [#Frames, #MFCC] * INPUT: - x = input signal (mono); - Tw = frame duration [s] (e.g. 0.025 s = 25 ms); - Tstep = frame step [s] (e.g. 0.01 s = 10 ms); - Fs = sampling frequency [Hz] (e.g. 16 kHz); - window = function handler for the windowing (e.g. @hamming); - Flow = the starting frequency of the mel filterbank (e.g. 80 Hz); - Fhigh = the tail frequency of the mel filterbank (e.g. Fs/2 = 8 kHz); - Nfilt = the number of filters in the mel filterank (e.g. 26); - Nmfcc = the number of MFCCs to return (e.g. 13); - p = the pre-emphasis HPF coefficient (e.g. 0.97); use 0 to skip pre-emphasis; - D = the sinusoidal liftering coefficient (e.g. 22); use 0 to skip liftering; - replC0 = if 1, replaces the first MFCC (C0) with the log-energy, for each frame; use 0 to avoid the replacement. **Note**: Yes, I am aware [**this**](https://www.mathworks.com/help/audio/ref/mfcc.html) already exists, but, like it says in the title, this is targeted towards users with older versions of MATLAB. ### Unimplemented features - No argument checking is present in the function -- avoid improper values. - No function for calculating the delta and delta-delta coefficients is included. - No multi-to-single channel conversion -- make sure to only use mono recordings. ### Demo script The file _mfcc\_test.m_ demonstrates how to use the function and provides a few interesting visual results. You can test it yourself using any audio file or the small sample included in this repository. **Cheers!**