Re: re-mixing/sampling

[Todd Pafford <galen@erols.com>]

This got me to thinking of a little gizmo I've seen
for folks who frequently fly and get bomarded with
all the noise that goes along with it.  The gizmo is
a set of headphones connected to a small walkman-like
device that detects all that ambient noise and 
retransmits it 180 degrees out of phase through the
headphones, thus cancelling the noise.

Now, I don't know how well these work, but I imagine a 
relatively simple signal processor could do the same 
and could be limited to a range of frequencies.
Unfortunately, this would effectively cut out whole
frequency ranges in a song instead of just a single
instrument. 

Would it be possible, I wonder, to hook in waveform
analysis too, to isolate not only the frequency, but
the sound of an instrument and feed it back out of 
phase?  

Probably to difficult, expensive, etc., but it's
something to think about.

---
"If the doors of perception were cleansed everything would appear
 to man as it is, infinite."  -- William Blake

Todd Pafford   galen@erols.com 


On Sat, 24 Jun 2000, matt davignon wrote:

> Most of the time you can't, although I hear that some kareoke machines 
>can 
> remove the vocal tracks from CD's, I don't think you could take a CD or 
> record and get just one instrument out of it.
> 
> The secret is to find a spot on the CD or record when the instrument you 
> want to sample is playing solo.
> 
> It is conceiveable that, with the right computer software, you could get 
>the 
> computer to identify all the frequencies of "a bass line" and subtract 
>it 
> note for note from a recording. I haven't heard of or seen software that 
> does that, but I imagine that if it exists, that it would be pretty 
> expensive and complex to use.
> 
> Matt