The first error is received because it is using "record" (to be removed in further MATLAB version) which is generally used to record data and event information to file for the serial port object. Also, it does not expect any output arguments as per the syntax given in the documentation page. Another function "record" which is used to record audio to "audiorecorder" object (and not "audioDeviceReader" object mentioned in your code). This also does not expect any output argument. The limitation to the "record" function is that it does not pause the execution until the recording is complete unlike "recordblocking". Moreover, the second argument to the "record" or "recordblocking" function is the recording time in seconds which you have given fs * 5 (this is very high). Instead, I have added "timelimit" property in private access properties in both the approaches. This asks user to input for how many seconds to record the sound.
I have mentioned two approaches where in Approch 1, I have used "audioDeviceReader" object and in appoach 2, I have used "audiorecorder" object. Necessary comments are added in the code for better understanding.
Approach 1:
In this approach, I have used "audioDeviceReader" object. The sound data is then saved in a WAV file format and later accessed using "audioread" function.
classdef app_one < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
InstrumentLabel matlab.ui.control.Label
EditField3 matlab.ui.control.EditField
ResetButton matlab.ui.control.Button
AnalyzeButton matlab.ui.control.Button
RecordButton matlab.ui.control.Button
UIAxes2 matlab.ui.control.UIAxes
UIAxes matlab.ui.control.UIAxes
end
properties (Access = private)
fs % Description
nob % Description
noc % Description
audio % Description
y % Description
t % Description
nfft % Description
f % Description
ymax % Description
f1 % Description
f2 % Description
xymax % Description
xmax % Description
val % Description
timelimit % newly added
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: RecordButton
function RecordButtonPushed(app, event)
app.RecordButton.BackgroundColor='g';
app.EditField3.Value= '-';
plot(app.UIAxes2,0,0);
plot(app.UIAxes,0,0);
app.fs=48000;
app.nob=16;
app.noc=2;
app.audio=audioDeviceReader('SampleRate', app.fs, 'NumChannels', app.noc);
% app.y=record(app.audio, app.fs * 5)';
%%%%%%%%%%%%%%%% newly added %%%%%%%%%%%%%%%%%%%%%%
% the following set of commands records the sound for a
% a given timelimit using attached microphone.
setup(app.audio)
fileWriter = dsp.AudioFileWriter('mySpeech.wav','FileFormat','WAV');
prompt = {'Enter a value of time to record the audio (in seconds)'};
dlgtitle = 'Recording time limit';
dims = [1 40];
definput = {'10'};
opts.Interpreter = 'tex';
app.timelimit = inputdlg(prompt,dlgtitle,dims,definput,opts);
app.timelimit = str2double(app.timelimit{1});
tic
while toc < app.timelimit
app.y = app.audio();
fileWriter(app.y);
end
msgbox('Recording complete.')
release(app.audio)
release(fileWriter)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
app.RecordButton.BackgroundColor='w';
end
% Button pushed function: AnalyzeButton
function AnalyzeButtonPushed(app, event)
[app.y, ~] = audioread('mySpeech.wav'); % newly added
% this reads the saved WAV file
app.nfft=2^nextpow2(length(app.y));
app.f=linspace(0,app.fs,app.nfft);
app.y=abs(fft(app.y,app.nfft));
% Find the highest peaks in the frequency spectrum
[pks,locs] = findpeaks(app.y(2:app.nfft/2),'MinPeakHeight',0.1*max(app.y(2:app.nfft/2)),'MinPeakDistance',50);
locs = locs + 1;
% Match peak frequencies with known frequency ranges of different instruments
instrument_names = {'Open Hi-Hat', 'Close Hi-Hat', 'Big Crash', 'Small Crash', 'Splash', 'Ride', 'Ride Bell', 'Floor Tom', 'High Tom', 'Low Tom', 'Bass Drum', 'Snare Drum'};
instrument_freq_ranges = {[7633,7787], [11702,11938], [5038,5140], [3992,4072], [6020,6142], [3524,3596], [3693,3767], [75,77], [166,170], [109,113], [30,80], [400,3000]};
detected_instruments = cell(1,length(locs)); % Preallocate cell array with fixed size
for i = 1:length(locs)
detected_instruments{i} = {};
for j = 1:length(instrument_freq_ranges)
if locs(i) > instrument_freq_ranges{j}(1) && locs(i) < instrument_freq_ranges{j}(2)
detected_instruments{i} = instrument_names{j};
else
detected_instruments{i} = 'not listed'; % newly added to avoid any error in strjoin
end
end
end
% Display detected instruments
if ~isempty(detected_instruments)
app.EditField3.Value = strjoin(detected_instruments, ', ');
else
app.EditField3.Value = 'Unknown instrument';
end
%%%%%%%%%%%%%%%% newly added %%%%%%%%%%%%%%%%%%%%%%
% Plot time domain signal for each channel
timeWindow = linspace(0,app.timelimit, length(app.y));
plot(app.UIAxes, timeWindow, app.y(:, 1), 'b')
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Plot frequency spectrum with peak frequencies marked
plot(app.UIAxes2, app.f(2:app.nfft/2), app.y(2:app.nfft/2),'r');
hold(app.UIAxes2, 'on');
plot(app.UIAxes2,app.f(locs),pks,'*b');
hold(app.UIAxes2, 'off');
end
% Button pushed function: ResetButton
function ResetButtonPushed(app, event)
app.EditField3.Value= '-';
plot(app.UIAxes2,0,0);
plot(app.UIAxes,0,0);
clear sound;
close all;
end
end
% Component initialization
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure and hide until all components are created
app.UIFigure = uifigure('Visible', 'off');
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = 'MATLAB App';
% Create UIAxes
app.UIAxes = uiaxes(app.UIFigure);
title(app.UIAxes, 'Time Domain')
xlabel(app.UIAxes, 'Time')
ylabel(app.UIAxes, 'Amplitude')
zlabel(app.UIAxes, 'Z')
app.UIAxes.Position = [1 153 313 328];
% Create UIAxes2
app.UIAxes2 = uiaxes(app.UIFigure);
title(app.UIAxes2, 'Frequency Domain')
xlabel(app.UIAxes2, 'Frequency')
ylabel(app.UIAxes2, 'Amplitude')
zlabel(app.UIAxes2, 'Z')
app.UIAxes2.Position = [329 153 300 328];
% Create RecordButton
app.RecordButton = uibutton(app.UIFigure, 'push');
app.RecordButton.ButtonPushedFcn = createCallbackFcn(app, @RecordButtonPushed, true);
app.RecordButton.Position = [69 98 100 23];
app.RecordButton.Text = 'Record';
% Create AnalyzeButton
app.AnalyzeButton = uibutton(app.UIFigure, 'push');
app.AnalyzeButton.ButtonPushedFcn = createCallbackFcn(app, @AnalyzeButtonPushed, true);
app.AnalyzeButton.Position = [259 97 100 23];
app.AnalyzeButton.Text = 'Analyze';
% Create ResetButton
app.ResetButton = uibutton(app.UIFigure, 'push');
app.ResetButton.ButtonPushedFcn = createCallbackFcn(app, @ResetButtonPushed, true);
app.ResetButton.Position = [438 97 100 23];
app.ResetButton.Text = 'Reset';
% Create EditField3
app.EditField3 = uieditfield(app.UIFigure, 'text');
app.EditField3.Position = [282 38 100 22];
% Create InstrumentLabel
app.InstrumentLabel = uilabel(app.UIFigure);
app.InstrumentLabel.Position = [301 59 62 22];
app.InstrumentLabel.Text = 'Instrument';
% Show the figure after all components are created
app.UIFigure.Visible = 'on';
end
end
% App creation and deletion
methods (Access = public)
% Construct app
function app = app_one
% Create UIFigure and components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
end
end
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end
Approach 2:
In this approch, the "audiorecorder" function is used which creates an object to record audio data from an input device such as a microphone for processing in MATLAB. The audiorecorder object contains properties that enable additional flexibility during recording. For example, you can pause, resume, or define callbacks using the audiorecorder object functions. Then, "getaudiodata" helps to extract the audio signal as a numeric array of different data types from the "audiorecorder" object. This approach alleviates saving the recorded signal to a WAV file as mentioned in Approach 1.
classdef app_one < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
InstrumentLabel matlab.ui.control.Label
EditField3 matlab.ui.control.EditField
ResetButton matlab.ui.control.Button
AnalyzeButton matlab.ui.control.Button
RecordButton matlab.ui.control.Button
UIAxes2 matlab.ui.control.UIAxes
UIAxes matlab.ui.control.UIAxes
end
properties (Access = private)
fs % Description
nob % Description
noc % Description
audio % Description
y % Description
t % Description
nfft % Description
f % Description
ymax % Description
f1 % Description
f2 % Description
xymax % Description
xmax % Description
val % Description
timelimit % newly added
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: RecordButton
function RecordButtonPushed(app, event)
app.RecordButton.BackgroundColor='g';
app.EditField3.Value= '-';
plot(app.UIAxes2,0,0);
plot(app.UIAxes,0,0);
app.fs=48000;
app.nob=16;
app.noc=2;
%%%%%%%%%%%%%%%% newly added %%%%%%%%%%%%%%%%%%%%%%
% the following set of commands records the sound for a
% a given timelimit using attached microphone.
% setup(app.audio)
prompt = {'Enter a value of time to record the audio (in seconds)'};
dlgtitle = 'Recording time limit';
dims = [1 40];
definput = {'10'};
opts.Interpreter = 'tex';
app.timelimit = inputdlg(prompt,dlgtitle,dims,definput,opts);
app.timelimit = str2double(app.timelimit{1});
app.audio = audiorecorder(app.fs, app.nob, app.noc);
app.audio.StartFcn = 'msgbox(''Start speaking.'')';
app.audio.StopFcn = 'msgbox(''End of recording.'')';
recordblocking(app.audio, app.timelimit);
app.y = getaudiodata(app.audio);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
app.RecordButton.BackgroundColor='w';
end
% Button pushed function: AnalyzeButton
function AnalyzeButtonPushed(app, event)
app.nfft=2^nextpow2(length(app.y));
app.f=linspace(0,app.fs,app.nfft);
app.y=abs(fft(app.y,app.nfft));
% Find the highest peaks in the frequency spectrum
[pks,locs] = findpeaks(app.y(2:app.nfft/2),'MinPeakHeight',0.1*max(app.y(2:app.nfft/2)),'MinPeakDistance',50);
locs = locs + 1;
% Match peak frequencies with known frequency ranges of different instruments
instrument_names = {'Open Hi-Hat', 'Close Hi-Hat', 'Big Crash', 'Small Crash', 'Splash', 'Ride', 'Ride Bell', 'Floor Tom', 'High Tom', 'Low Tom', 'Bass Drum', 'Snare Drum'};
instrument_freq_ranges = {[7633,7787], [11702,11938], [5038,5140], [3992,4072], [6020,6142], [3524,3596], [3693,3767], [75,77], [166,170], [109,113], [30,80], [400,3000]};
detected_instruments = cell(1,length(locs)); % Preallocate cell array with fixed size
for i = 1:length(locs)
detected_instruments{i} = {};
for j = 1:length(instrument_freq_ranges)
if locs(i) > instrument_freq_ranges{j}(1) && locs(i) < instrument_freq_ranges{j}(2)
detected_instruments{i} = instrument_names{j};
else
detected_instruments{i} = 'not listed'; % newly added to avoid any error in strjoin
end
end
end
% Display detected instruments
if ~isempty(detected_instruments)
app.EditField3.Value = strjoin(detected_instruments, ', ');
else
app.EditField3.Value = 'Unknown instrument';
end
%%%%%%%%%%%%%%%% newly added %%%%%%%%%%%%%%%%%%%%%%
% Plot time domain signal for each channel
timeWindow = linspace(0,app.timelimit, length(app.y));
plot(app.UIAxes, timeWindow, app.y(:, 1), 'b')
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Plot frequency spectrum with peak frequencies marked
plot(app.UIAxes2, app.f(2:app.nfft/2), app.y(2:app.nfft/2),'r');
hold(app.UIAxes2, 'on');
plot(app.UIAxes2,app.f(locs),pks,'*b');
hold(app.UIAxes2, 'off');
end
% Button pushed function: ResetButton
function ResetButtonPushed(app, event)
app.EditField3.Value= '-';
plot(app.UIAxes2,0,0);
plot(app.UIAxes,0,0);
clear sound;
close all;
end
end
% Component initialization
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure and hide until all components are created
app.UIFigure = uifigure('Visible', 'off');
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = 'MATLAB App';
% Create UIAxes
app.UIAxes = uiaxes(app.UIFigure);
title(app.UIAxes, 'Time Domain')
xlabel(app.UIAxes, 'Time')
ylabel(app.UIAxes, 'Amplitude')
zlabel(app.UIAxes, 'Z')
app.UIAxes.Position = [1 153 313 328];
% Create UIAxes2
app.UIAxes2 = uiaxes(app.UIFigure);
title(app.UIAxes2, 'Frequency Domain')
xlabel(app.UIAxes2, 'Frequency')
ylabel(app.UIAxes2, 'Amplitude')
zlabel(app.UIAxes2, 'Z')
app.UIAxes2.Position = [329 153 300 328];
% Create RecordButton
app.RecordButton = uibutton(app.UIFigure, 'push');
app.RecordButton.ButtonPushedFcn = createCallbackFcn(app, @RecordButtonPushed, true);
app.RecordButton.Position = [69 98 100 23];
app.RecordButton.Text = 'Record';
% Create AnalyzeButton
app.AnalyzeButton = uibutton(app.UIFigure, 'push');
app.AnalyzeButton.ButtonPushedFcn = createCallbackFcn(app, @AnalyzeButtonPushed, true);
app.AnalyzeButton.Position = [259 97 100 23];
app.AnalyzeButton.Text = 'Analyze';
% Create ResetButton
app.ResetButton = uibutton(app.UIFigure, 'push');
app.ResetButton.ButtonPushedFcn = createCallbackFcn(app, @ResetButtonPushed, true);
app.ResetButton.Position = [438 97 100 23];
app.ResetButton.Text = 'Reset';
% Create EditField3
app.EditField3 = uieditfield(app.UIFigure, 'text');
app.EditField3.Position = [282 38 100 22];
% Create InstrumentLabel
app.InstrumentLabel = uilabel(app.UIFigure);
app.InstrumentLabel.Position = [301 59 62 22];
app.InstrumentLabel.Text = 'Instrument';
% Show the figure after all components are created
app.UIFigure.Visible = 'on';
end
end
% App creation and deletion
methods (Access = public)
% Construct app
function app = app_one
% Create UIFigure and components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
end
end
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end
If this solution worrks for you, please accept the answer.
