Error in helperspeechSpectrograms (line 14) numHops = ceil((segmentDuration - frameDurat​ion)/hopDu​ration);

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Rimsha Muzaffar
Rimsha Muzaffar 2022-7-16
function X = helperspeechSpectrograms(ads,segmentDuration,frameDuration,hopDuration,numBands)
% This function is only for use in the
% "Spoken Digit Recognition with Wavelet Scattering and Deep Learning"
% example. It may change or be removed in a future release.
%
% helperspeechSpectrograms(ads,segmentDuration,frameDuration,hopDuration,numBands)
% computes speech spectrograms for the files in the datastore ads.
% segmentDuration is the total duration of the speech clips (in seconds),
% frameDuration the duration of each spectrogram frame, hopDuration the
% time shift between each spectrogram frame, and numBands the number of
% frequency bands.
disp("Computing speech spectrograms...");
numHops = ceil((segmentDuration - frameDuration)/hopDuration);
numFiles = length(ads.Files);
X = zeros([numBands,numHops,1,numFiles],'single');
for i = 1:numFiles
[x,info] = read(ads);
x = normalizeAndResize(x);
fs = info.SampleRate;
frameLength = round(frameDuration*fs);
hopLength = round(hopDuration*fs);
spec = melSpectrogram(x,fs, ...
'Window',hamming(frameLength,'periodic'), ...
'OverlapLength',frameLength - hopLength, ...
'FFTLength',2048, ...
'NumBands',numBands, ...
'FrequencyRange',[50,4000]);
% If the spectrogram is less wide than numHops, then put spectrogram in
% the middle of X.
w = size(spec,2);
left = floor((numHops-w)/2)+1;
ind = left:left+w-1;
X(:,ind,1,i) = spec;
if mod(i,500) == 0
disp("Processed " + i + " files out of " + numFiles)
end
end
disp("...done");
end
Error in helperspeechSpectrograms (line 14) numHops = ceil((segmentDuration - frameDuration)/hopDuration);

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