MATLAB: Can we access the audio while recording online using matlab

MATLAB

by using fpga we can do simultaneous tasks like accessing audio while recording. But in matlab, can we do like that? I want to play online while recording.. is it possible with matlab?

Best Answer

I am not sure what "play online while recording" means. You can play and record sounds "simultaneously" with audioplayer/audiorecorder. You cannot access what is being recorded by audiorecorder while it is being recorded. So therefore you cannot play a modified version of your recording as it is being recorded with audioplayer/audiorecorder.

For Windows the data acquisition toolbox will give you a little more flexibility, but the latency will be unknown and variable.

For the best results, you need something based on PortAudio. I recommend the psychtoolbox implementation, even though it comes with lots of unrelated stuff. There are still latency issues, but they are probably as minimal as you can make them without going to specialized hardware.

Related Solutions

MATLAB: Sound audio playing and recording simultaneously

It is necessary to use either DAQ or DSP to get simultaneous audio playing and recording if you want the two to be synchronized.

If you do not care about the two being synchronized, the audioplayer() play() method is asynchronous, and the audiorecorder() record() method is also asynchronous, so you can start one and then the other while still being able to react to user events.

MATLAB: Do I receive an error when attempting to record data using AUDIORECORDER in MATLAB 7.8 (R2009a)

To work around this issue, record for a longer period of time, and then analyze the portion of the recorded message in which you are interested. For example, execute the following:

r = audiorecorder(44100, 16, 1);
record(r,5); % speak into microphone...
stop(r);
p = play(r); % listen to complete recording

You may still receive the warning message, however, you may ignore this.

This issue is due to latency between the time that the command

   record(r)
 is entered and when the actual recording starts on your sound card.

The warning

 Warning: !JavaAudioRecorder.recordthread.message!  
 is thrown when recording does not start within 1 second.  The fact that data is recorded when you record for 2 seconds by executing
pause(2)

but not when you pause for only 0.5 seconds, further confirms this. Also, the error message

 ??? Error using ==> audioplayer.audioplayer at 68
 Recorder is empty.

occurs when attempting to play an audiorecorder object before recording, since the object does not contain any recorded data.

Refer to the related solution for instructions if you wish to turn off this particular warning message.

Best Answer

Related Solutions

MATLAB: Sound audio playing and recording simultaneously

MATLAB: Do I receive an error when attempting to record data using AUDIORECORDER in MATLAB 7.8 (R2009a)

Related Question