Can someone pls help me with this code. (mfcc)

Question

Gaurav Sharma 2018-11-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/431462-can-someone-pls-help-me-with-this-code-mfcc

评论： hanif omar 2021-1-19

whenever I am trying to run the code it is throwing an error i.e. =>

"Undefined function or variable 'melfilter'.
Error in mfcc (line 29)
filterBankMat = melfilter(N, Fs,@hamming);                % matrix for a mel-spaced filterbank
Error in phase1 (line 17)
 M = mfcc(y, Fs);"
% ============================================================
CODE: 
function c = mfcc(y, Fs)
% MFCC Calculate the mel frequencey cepstrum coefficients (MFCC) of a signal
%
% Inputs: 
%       y       : speech signal data
%       Fs      : sample rate in Hz of the speech signal data y
%
% Outputs:
%       c       : MFCC output, each column contains the MFCC's for one speech frame
N = 256;                        % frame size
M = 100;                        % inter frame distance
len = length(y);
numberOfFrames = 1 + floor((len - N)/double(M));
mat = zeros(N, numberOfFrames); % vector of frame vectors
for i=1:numberOfFrames
    index = 100*(i-1) + 1;
    for j=1:N
        mat(j,i) = y(index);
        index = index + 1;
    end
end
hamW = hamming(N);              % hamming window
afterWinMat = diag(hamW)*mat;   % square diagonal matrix
freqDomMat = fft(afterWinMat);  % FFT into freq domain
filterBankMat = melfilter(20,N, Fs);                % matrix for a mel-spaced filterbank      [HERE IT IS THROWING ERROR].
nby2 = 1 + floor(N/2);
ms = filterBankMat*abs(freqDomMat(1:nby2,:)).^2; % mel spectrum
c = dct(log(ms));                                % mel-frequency cepstrum coefficients
c(1,:) = [];                                     % exclude 0'th order cepstral coefficient
end

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madhan ravi 2018-11-23

编辑：madhan ravi 2018-11-23

download FEX

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Answer 1

Gaurav Sharma 2018-11-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/431462-can-someone-pls-help-me-with-this-code-mfcc#answer_348479

on the mathwork website, melfilter is gievn as predefined funcion which can be directly used. That's why I am a bit confused. And if am trying to put melfiter as an input in the argument of the function mfcc, it throws an error of not enough input defined.

what should I do now?? I want to run this code since it is my project. Pls help me !!!

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Gaurav Sharma 2018-11-23

Thank You sir, It worked.

hanif omar 2021-1-19

Dear @Gaurav Sharma , is this mfcc code start from pre emphasis ?

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Answer 2

Jacob Shulman 2018-11-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/431462-can-someone-pls-help-me-with-this-code-mfcc#answer_348466

if melfilter is a matrix you want to use then it must be an input to the function or be created and defined wihtin the function. functions create different new workspaces with new variables.