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add function msf_delta #1

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21653e7
changed preemph default to 0.97 and added explanation in msf_mfcc; ad…
Oct 5, 2016
1733cbc
removed preemph change, focus on msf_delta
Oct 28, 2016
dcc2fb1
further removed preemph change
Oct 28, 2016
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21 changes: 21 additions & 0 deletions msf_delta.m
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Original file line number Diff line number Diff line change
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%% msf_delta - Delta Feature calculation
%
% function delta = msf_delta(feat, N)
%
% * |feat| - a matrix with each row being the feature vector extracted from a frame
% * |N| - for each frame, calculate delta features based on preceding and following N frames
%
% Example usage:
%
% d_mfcc = msf_delta(mfcc, 2);
% dd_mfcc = msf_delta(d_mfcc, 2);
%
function delta = msf_delta(feat, N)
delta_filter = (N:-1:-1*N);
denom = sumsqr(delta_filter);
delta = zeros(size(feat));
for feat_dim = 1:size(feat, 2)
tmp = filter(delta_filter, denom, [ones(N,1); feat(:,feat_dim); ones(N,1)]);
delta(:,feat_dim) = tmp(2*N+1:size(tmp));
end
end