Plot a sound file in MATLAB GUI

Hello everyone I'm the best rookie in MATLAB and I need help again.

So I want to plot selected item on listbox1

thats my codes

function listbox1_Callback(hObject, eventdata, handles)
axes(handles.axes1);
time= 1:5;
axess = get(handles, 'String');
signal = get(handles, 'Value');
axessignal = axess{signal};
plot(axessignal,time);

it will plot when user select an item on listbox1

I mean when user selects first item on listbox1 then axes1 will plot first item and user selects second item axes1 will plot it

all files are sound

by the way I'm getting this error when i try codes that i wrote up

Error using get

Conversion to double from struct is not

possible.

Answer 1

[Emre Akinci]

code that you wrote shows me my listbox items

and when i examined hObjects it showed me properties of listbox1 string is selected file name

[Emre Akinci]

Thanks Mr. Roberson for help. I found how to do it. There are codes

function listbox1_Callback(hObject, eventdata, handles)
axes(handles.axes1);
signal = hObject.Value;
axess = hObject.String;
axessignal = audioread(axess{signal});
time = (0:size(axessignal,1)-1)/44100;
plot(time, axessignal(:,1));

these codes are plotting sound files that selected from listbox1

[Walter Roberson]

Why do you assume 44100 when it is trivial to get the sampling frequency from the file?

You should avoid assuming that the files are in the current directory: you should be giving the user a choice of directories and you should record that choice. That is what the audiodir = handles.DirectoryOfAudioFiles; in my response was about.

[Emre Akinci]

you are right sir.

but it is not very important because we are providing useable audiofiles

all files fs are 44100 and in 100000x1 dimension

Answer 2

[Walter Roberson]

function listbox1_Callback(hObject, eventdata, handles)
axes(handles.axes1);
time= 1:5;
axess = get(hObject, 'String');
signal = get(hObject, 'Value');
signal_name = axess{signal};

Now you have to load the data whose name is given by signal_name, and then plot it. For example,

audiodir = handles.DirectoryOfAudioFiles;
filename = fullfile(audiodir, [signal_name, '.wav']);
[data, FS] = audioread(filename);
time = (0:size(data,1)-1)/FS;
plot(time, data(:,1));

[Emre Akinci]

I cant make it work and it is doing what I said?

[Emre Akinci]

Conversion to double from struct is not possible.

I get this error again

axess = get(hObject, 'String');

about that code

[Walter Roberson]

dbstop if error

and then run your code. When it stops, examine hObject : in your release it would be expected to disp in a format such as

UIControl with properties:

Show us the output of

which get(hObject)
dbstack

[Emre Akinci]

get is a built-in method % matlab.ui.control.UIControl method

> In bitti>listbox1_Callback (line 106)

In gui_mainfcn (line 95)

In bitti (line 43)

In matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)bitti('listbox1_Callback',hObject,eventdata,guidata(hObject))

I'm getting this when I wrote

which get(hObject)
dbstack

[Walter Roberson]

When you examined hObject, what showed up? The other information you provided suggests that you did see a UIControl but it is best to be sure.

When you are stopped at the error, what shows up if you try

axess = hObject.String

[Walter Roberson]

axess = hObject.String;
signal = hObject.Value;