Error converting Logical to Char (Horzcat Error)

afe = audioFeatureExtractor( ...
    'SampleRate',fs, ...
    'FFTLength',512, ...
    'Window',hann(frameSamples,'periodic'), ...
    'OverlapLength',frameSamples - hopSamples, ...
    'barkSpectrum',true);

numBands = 50;
setExtractorParams(afe,'barkSpectrum','NumBands',numBands,'WindowNormalization',false);

In this line of code, I am receiving an error of converting logical to char (Horzcat error). How to solve this issue?

[Rik]

What is the full trace of the error? (all the red text)

Try to make a MWE so we can run your code without any other dependencies and can reproduce your issue.

[angry paul]

https://ww2.mathworks.cn/help/audio/ug/Speech-Command-Recognition-Using-Deep-Learning.html#d123e9191

In the section of compute audit spectra，I tried to reproduce the code.

Wrong use of horzcat

The following error occurred while converting from logical to char:

Unable to convert from logical to char.

Error audiofeatureextractor / setextractorparams (line 398)

if isscalar([varargin{:}])

[Rik]

fs = 16e3; % Known sample rate of the data set.

segmentDuration = 1;
frameDuration = 0.025;
hopDuration = 0.010;

segmentSamples = round(segmentDuration*fs);
frameSamples = round(frameDuration*fs);
hopSamples = round(hopDuration*fs);
overlapSamples = frameSamples - hopSamples;

FFTLength = 512;
numBands = 50;

afe = audioFeatureExtractor( ...
    'SampleRate',fs, ...
    'FFTLength',FFTLength, ...
    'Window',hann(frameSamples,'periodic'), ...
    'OverlapLength',overlapSamples, ...
    'barkSpectrum',true);
setExtractorParams(afe,'barkSpectrum','NumBands',numBands,'WindowNormalization',false);
disp('completed without error')

completed without error

Which release are you using?

[angry paul]

R2020a

Answer 1

[Walter Roberson]

It is a bug in some versions of Audio System Toolbox. In later versions the line

    if isscalar([varargin{:}])

has been replaced with

    numin = numel(varargin);
    if numin==1 && isscalar([varargin{:}])

I will post exact line numbers once I finish installing the old version to check against.

The problem was fixed by no later than R2020b

[Walter Roberson]

R2020a, the code is in a single .m instead of an @ class directory.

In R2020a, and possibly some earlier versions, but not R2020b or later:

edit(fullfile(matlabroot, 'toolbox/audio/audio/audioFeatureExtractor.m'))

Look for lines 397 and 398

    numin = numel(varargin);
    if isscalar([varargin{:}])

Change that to

    numin = numel(varargin);
    if numin==1 && isscalar([varargin{:}])

and save.

You will need to have write access to the appropriate directory, which might require you to have started MATLAB with "Run As Administrator"

[angry paul]

sorry，I'm using the 2020a version，I took your approach, but there were new mistakes.

Misuse matlabshared.fusionutils.internal .setProperties>validateparameter (line 77)

Property / value is not valid for group parameter.

Error matlabshared.fusionutils.internal .setProperties (line 67)

validateparameter(param, obj);

Error audiofeatureextractor / setextractorparams (line 406)

params = matlabshared.fusionutils.internal .setProperties(defaults, numin, varargin{:});

[Walter Roberson]

'WindowNormalization' is not a supported parameter in your release.

[angry paul]

Sir thank you so much for your help, I got my mistake.

[Sharena Natasha Nor Hisham]

may i ask how you solved the issue about the 'windowNormalization' not a supported parameter? because im having the same problem

[Walter Roberson]

R2020b was the first release to support WindowNormalization.

In R2020a and before, there is a 'Normalization' parameter that can be set to 'area' or 'bandwidth', but this is not the same thing.

In R2020b, 'Normalization' was renamed to 'FeatureBankNormalization', and 'WindowNormalization' was added.

I do not seem to find any information as to what WIndowNormalization actually does.

[Sharena Natasha Nor Hisham]

ahh I see. Thank you so much for replying!