4 ms·

>In short, ultrasonic frequencies will interact with each other in the room (reflections, reverb and so on) in a way that causes interference in the frequency r

• JonnieCache 15y ago
  The idea is that once you've recorded the sound, you want to be able to mix it with other sounds in an arbitrary virtual 3D space, so you need the ultrasound. I think.
• cube13 15y ago
  >If a vibrating membrane of skin in my head can react to it, then it is a wave traveling through air. Why wouldn't this hold for a microphone? Microphones don't respond in the same way to the same frequencies that your eardrum does. They can generally only record a subset of the total audio spectrum. So they're unable to completely reproduce the sound that was created by the instrument. If the ultrasonic frequencies resonate with a frequency that you can hear, it can cause some odd things to happen if the mic isn't able to record the frequency directly.
  • jpitz 15y ago
    ( Background: I was a professional musician in a past life and I was quite involved in sound reinforcement. ) No two ears, nor no two microphones have the exact same response curve. I'm not yet convinced that what you or the original comment I reply'd to can be explained by differences in curves which, AFAIK, are relatively flat in the sonic regions we're discussing. The mic I referred to earlier looks to be flat to within 3db from 200hz to 20k. Are we discussing signals outside that range or within it?