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Author: jibrahim80

HelperFiles/SpeechCommands.m

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+classdef SpeechCommands < Simulink.IntEnumType
+% This class is required to run the Simulink model
+
+%   Copyright 2021-2022 The MathWorks, Inc.
+
+  enumeration 
+    silence (0)
+    Unknown(1)
+    yes (2)
+    no (3)
+    up (4)
+    down (5)
+    left (6)
+    right (7)
+    on (8)
+    off (9)
+    stop (10)
+    go (11)
+  end
+end 

HelperFiles/cmdRecognitionPyTorch.onnx

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+function out = generateMelSpectrogramCode(args,type)
+% generateMelSpectrogramCode Generate MATLAB code to perform Mel
+% spectrogram computation
+
+%Copyright 2022 The MathWorks, Inc.
+
+if nargin==1
+    type='object';
+end
+
+center = args{"center"};
+if center
+    error('center must be false to get a match')
+end
+
+htk = args{"htk"};
+if ~htk
+    error('htk must be true to get a match')
+end
+
+sr = args{"sr"};
+sr = double(sr);
+
+windowType = args{"window"};
+windowType = char(windowType);
+
+WindowLength = args{"win_length"};
+WindowLength = double(WindowLength);
+
+HopLength = args{"hop_length"};
+HopLength = double(HopLength);
+
+FFTLength = args{"n_fft"};
+FFTLength = double(FFTLength);
+
+n_mels = args{"n_mels"};
+n_mels = double(n_mels);
+
+norm = args{"norm"};
+norm = char(norm);
+
+fmin = args{"fmin"};
+fmin = double(fmin);
+
+fmax = args{"fmax"};
+fmax = double(fmax);
+
+switch norm
+    case 'None'
+        norm = 'none';
+    case 'slaney'
+        norm = 'bandwidth';
+    otherwise
+        norm = 'area';
+end
+
+code = sprintf('afe = audioFeatureExtractor(SampleRate=%f,Window=%s(%d,"periodic"),...\nOverlapLength=%d,FFTLength=%d,melSpectrum=true);\n',sr,windowType,WindowLength,WindowLength-HopLength,FFTLength);
+code = sprintf('%s\nsetExtractorParameters(afe,"melSpectrum",SpectrumType="power",...\n',code);
+code = sprintf('%s                         FilterBankDesignDomain="linear",...\n',code);
+code = sprintf('%s                         FilterBankNormalization="%s",...\n',code,norm);
+code = sprintf('%s                         WindowNormalization=false,...\n',code);
+code = sprintf('%s                         NumBands=%d,...);\n',code,n_mels);
+code = sprintf('%s                         FrequencyRange=[%f %f]);\n',code,fmin,fmax);
+
+if strcmp(type,'object')
+    eval(code);
+    out = afe;
+elseif strcmp(type,'block')
+    open_system(new_system)
+    name = get_param(gcs,'Name');
+    blk = [name '/Mel Spectrogram'];
+    add_block('audiofeatures/Mel Spectrogram',blk)
+    set_param(blk,'NumBands',num2str(n_mels))
+    set_param(blk,'FilterBankNormalization',norm)
+    set_param(blk,'OverlapLength',num2str(WindowLength-HopLength))
+    set_param(blk,'WindowParameter',sprintf('%s(%d,"periodic")',windowType,WindowLength))
+    set_param(blk,'AutoFFTLength','off')
+    set_param(blk,'FFTLength',num2str(FFTLength))
+    set_param(blk,'SampleRate',num2str(sr))
+    set_param(blk,'SpectrumType','power')
+    set_param(blk,'WindowNormalization','off') 
+    set_param(blk,'FrequencyRange',sprintf('[%f %f]',fmin,fmax))
+    set_param(blk,'AutoFrequencyRange','off')
+    % Set parameters
+    out = gcs;
+else
+    out = sprintf('%s\nS = extract(afe,y);',code);
+end
+
+end

HelperFiles/generateMelSpectrogramCode.m

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+function out = librosaToAudioToolbox(functionName, args, type)
+% librosaToAudioToolbox Convert Librosa Mel spectrogram call to equivalent
+% MATLAB code
+
+% Copyright 2022 The MathWorks, Inc.
+
+if nargin==2
+    type = 'code';
+end
+
+if strcmp(functionName,'melSpectrogram')
+    out = generateMelSpectrogramCode(args,type);
+else
+    out = '';
+end
+
+end