How to record audio with start and stop pushbuttons in gui and plot the fft

I am writing a program to record an audio file with start and stop push buttons. how do I set an audiorecorder in first place? and then how to make the pushbuttons start the recording and stop the recording?

[Kevin Chng]

Do you familiar with app designer in MATLAB?

Here is the code for audio recording

% Record your voice for 5 seconds.
recObj = audiorecorder;
disp('Start speaking.')
recordblocking(recObj, 5);
disp('End of Recording.');

% Play back the recording.
play(recObj);

% Store data in double-precision array.
myRecording = getaudiodata(recObj);

% Plot the waveform.
plot(myRecording);

[mohanish]

I am familiar with the app designer but I have programmed all my code using Guide and I want to develop this by Guide as well

[Kevin Chng]

Great!You may do this :

callback for first button : Start Recording

global recObj
recObj = audiarecorder ; %create object
record(recObj); %start Recording

Callback for 2nd button : Stop recording

global recObj
stop(recObj) % Stop

Callback for 3rd button ; % Play Recording

global recObj
play(recObj) % Play

Let me know if it is working for you.However, in the third button, you must write code to check the existing of recObj before playing it.

[mohanish]

Don't I have to first set an audiorecorder?

[mohanish]

here is the code and fig file that i am working on

Answer 1

[Kevin Chng]

Hi Mohanish,

Please refer to the attached m.file which consist the function of record, stop record, plot and play the audio. However, I constructed them in app designer instead of guide.

If you have any question, just let me know

[mohanish]

thanks for your help Kevin, but I am looking for guide code. I cannot link them together.

[Kevin Chng]

Okay, try to help you write up guide code if I have time this week. However, the concept is similar.

[mohanish]

yes. thanks. I got the it to record an audio from microphone and plot the frequency domain. playing the recording back is remaining. i would also like to know how to plot the frequency domain simultaneously with the audio input.