Processing 1.0 - Processing Discourse - Microphone Recording with ESS

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Index › Programming Questions & Help › Sound, Music Libraries › Microphone Recording with ESS

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Microphone Recording with ESS (Read 1703 times)

tomgupper

Microphone Recording with ESS
May 9^th, 2007, 4:25pm

Hi there, I'm a relatively new Processing user, sort of been lurking for a long time on the forums and dabbling here and there. I decided to code my latest uni assignment in processing, and I'm just wondering if you people out there can help me.

Currently I'm using ESS to record audio data from my microphone, and save it as a .wav file on my hdd. To do this Im using an AudioInput to access the mic, sending that to an AudioStream, and then saving the AudioStream into an AudioFile. ( I think that's the best way to describe it ).

This works fine, I can record microphone input with no worries, the only problem with this implementation is that the microphone input is "echo-ed" back through the speakers as It's being recorded.

Is there any way to record from a microphone or other line-in device, without it being broadcast through the speakers as well ?

JohnG Ex Member	Re: Microphone Recording with ESS Reply #1 - May 9^th, 2007, 5:29pm If you're on windows, you just need to open the sound panel (the spaker icon in the system tray) and mute the mic input.

tomgupper

Re: Microphone Recording with ESS
Reply #2 - May 10^th, 2007, 12:21pm

Thanks for the reply.

I'm in windows vista so the sound panel works a little bit differently. However, muting the mic input still has no effect. ( I've tested this on XP too, same thing ).

I'm not sure if I made it clear in my original post, the microphone isn't ALWAYS doing that 'echo' thing. Only when I start running the processing sketch.

ddf

Re: Microphone Recording with ESS
Reply #3 - May 10^th, 2007, 4:09pm

If the AudioStream is feeding its input back to the system, that's where your echo is coming from. I assume you have the mic set to monitor, so when you aren't running anything you can talk in the mic and it comes out the speakers. You should be able to write from the AudioInput directly to the AudioFile, which would solve the echo problem, I think.

From the AudioFile example (just changed the var name):

Code:


if (recording) 
{
    myFile.write(myInput);
    bytesWritten+=myStream.size*2;
}

http://www.compartmental.net

tomgupper

Re: Microphone Recording with ESS
Reply #4 - May 12^th, 2007, 12:19am

changing that line gives me the following error :

Code:


Semantic Error: No applicable overload for a method with signature "write(krister.Ess.AudioInput)" was found in type "krister.Ess.AudioFile". Perhaps you wanted the overloaded version "void write(krister.Ess.AudioOutput $1);" instead?

ddf Full Member Offline Posts: 241	Re: Microphone Recording with ESS Reply #5 - May 12^th, 2007, 12:23am Huh, that's a bugger. I don't have a good answer for you. According to the doc page for AudioFile.write() it should be able to take an AudioInput: http://www.tree-axis.com/Ess/AudioFile/AudioFile_write.html You could try muting the AudioStream, but I suspect then you'd wind up with silence in your file.
	http://www.compartmental.net

tomgupper YaBB Newbies Offline Posts: 46 Australia	Re: Microphone Recording with ESS Reply #6 - May 12^th, 2007, 12:25am haha yeah, I've tried muting the stream too...No sound at all. hmmm, ok. Thanks for the help - I'll keep at it! and see what I can come up with. Will post in here if I manage to come out with a solution.

tomgupper

Re: Microphone Recording with ESS
Reply #7 - May 24^th, 2007, 3:37pm

Just an update for those who were following this thread, I found a solution today. And it's actually basically what ddf suggested earlier ( and which I actually tried ), maybe ddf suggested a different solution, and I tried something else. But oh well , this is what I did :

basically changed the following code, as ddf suggested :

Code:

 if (recording)  
{
    myFile.write(myStream);
    bytesWritten+=myStream.size*2;
}

so that it was :

Code:

  if (isRecording) {
    myFile.write(myInput.buffer);
    bytesWritten+=myInput.size*2;
  }

I completed deleted "void audioStreamWrite", and put that code inside "void audioInputData".

I *think* that's all I did. It's late, so I'm not thinking 100% straight, all I know is that now it works! And it doesn't give me a live microphone output/monitor during recording.

So thankyou for your help everyone, if you need further explaination, feel free to reply here, I'm watching the topic for replies.

haligali YaBB Newbies Offline Posts: 1	Re: Microphone Recording with ESS Reply #8 - Jun 10^th, 2007, 6:54pm I'm a totally new to processing. I have to make an application that records and plays back the sound. I would like to ask for the source code that you used for recording and saving files, mentioned above. Is it possible? tnx

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