Re: re-mixing/sampling

["Larry Tremblay" <ltct@concentric.net>]

OK - I'll chime in...

What's needed is a way to isolate the instrument. This is
accomplished through a combination of filters and noise
gates.

First isolate the frequency range you want to sample
using a band-pass filter. Second, boost the frequency
content you're interested in so that it "pops" out of the
mix using a high-pass or low-pass filter, depending on the
content you're interested in. Finally, gate out the unwanted
frequency content using the side-chain of a gate, triggered
by the amplitude (or frequency) of the sample you want.

I used this technique to reconstruct a whole master tape
from a rough mix tape. I was even able to isolate a bass guitar
track from a drum track. Where overlaps occur, use a notch
filter and dial in the exact frequency you want to eliminate.

This won't give you an absolutely pure sample but is the next
best thing to having the master tapes.

Hope this helps.

----- Original Message -----
From: "matt davignon" <mattdavignon@hotmail.com>
To: <Loopers-Delight@annihilist.com>
Sent: Sunday, June 25, 2000 5:16 AM
Subject: Re: re-mixing/sampling


> 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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