Re: re-mixing/sampling

["matt davignon" <mattdavignon@hotmail.com>]

I think that it's possible. I'm impressed by the fact that these aircraft 
headphones are the instantaneous equivalent of what noise reduction 
software 
does. It detects the frequencies and deletes them by "phasing them out".

The problem with doing this to an instrument, or for the sake of the 
argument, several instruments (leaving one or a few to be sampled), is 
that 
an instrumental performance in a song contains a lot of variations in 
intensity, frequency (notes) and all sorts of other elements. I've heard 
of 
software (and some hardware) that can take out instruments, but I'm 
skeptical for this reason. Aircraft noise, while wavically complex, 
doesn't 
vary anywhere near as much as individual instrumental elements of a song.

Some pop artists appear to have been able to sample a single instrument in 
a 
song (in which the instrument originally never plays by itself). My theory 
has always been that they sampled from the multitrack tape of the original 
artist somehow.

Matt

>From: Todd Pafford <galen@erols.com>
>Reply-To: Loopers-Delight@annihilist.com
>To: Loopers-Delight@annihilist.com
>Subject: Re: re-mixing/sampling
>Date: Sat, 24 Jun 2000 17:35:27 -0400 (EDT)
>
>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
>
>

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