compress audio signal recorded in GUI

function pushbutton_Callback(hObject, eventdata, handles)
r=audiorecorder;
recordblocking(r,5);
play(r);
mr=getaudiodata(r);
axes(handles.axes1);
plot(mr);

In this code I want to apply compression on the recorded signal 'mr'.

[Rik]

The context of a GUI is almost never relevant, nor is it here.

You need to write code that does the compression you want. Then you can call that function in your GUI.

Have a read here and here. It will greatly improve your chances of getting an answer.

Answer 1

[Walter Roberson]

%one way of compressing
compressed_mr1 = mr(1:2:end,:);

%another way of compressing
compressed_mr2 = resample(mr(:,1), 8000, 22050);

%another way of compressing
tn = tempname;
fid = fopen(tn, 'w');
fwrite(fid, mr(:,1), 'double');
fclose(fid);
zip([tn '.zip'], tn);
fid = fopen([tn .zip'], 'r');
compressed_mr3 = fread(fid, [1 inf], '*uint8');
fclose(fid)