audioin noise

Beginners
1

I’m trying to get a line to form the wave curve of a sound but I’m not getting clean results.

I have a simple setup with a channel SOP retargeting an audio channel to points on a line. I’m passing in sounds with an audioin but to get visible movement on the line I’m having to boost the signal right up with a math chop. It works OK and has the desired effect but there’s a lot of noise coming through when there’s no sound.

Does anyone have a method of removing the noise without losing the detail in the audio wave?

Cheers,
Tom

2

Hi Tom,

did you try increasing the volume on the operating system side basically via the Volume Control?

cheers
markus

3

Hi,
Yes the volume is on full in both the music player and OS.
Cheers,
Tom

4

Could it be that in the source parameter of the Audio In CHOP it is set to the Microphone?

cheers
Markus

5

I have no idea if this is the problem or not, but here’s something I run into sometimes.
I’m using an Edirol A-101 as my audio input/output.

Now if I’m using Touch alone with audio,
I have no problem.
However, if I’m also have up web pages with audio in them (such as Pandora or video players),
or other audio programs, sometimes my audio will crackle, and then eventually my computer gets confused and I lose all audio until I reboot.

So my solution is if working with Touch, I stay away from other applications with audio, and Audio in Touch works fine.

Now this could just be some driver conflict on my end.
I’m unsure, and I haven’t really gone through the trouble of exploring it extensively.
But, I thought perhaps explaining my situation could be of some help to you Tom.

6

Hi Jim, I thought it may be because I was playing music through itunes and firefox but I’m still getting noise coming through with only Touch open. Even with no audio playing if I multiply the audioin CHOP by 10,000 I get white noise looking values between -4 and 4.
I wasn’t sure whether or not to just delete this range because I might lose some audio. Are you not getting this problem when you’re running just Touch then?

Markus, the source for my audioin is SoundMAX digital audio device which is my default sound recording and sound playing device.

7

You usually have noise - I have never seen no noise in a signal from the audio card. But what I don’t understand is why your signal is so low…

To get around the noise you can build a little network that multiplies the audio in channels by 0 if the signals power is lower then some custom value. You can get the rms power of a signal via a Analyze CHOP.

cheers
markus