Subject: Re: [ecasound] Inverting a chain?
From: Kai Vehmanen (k_AT_eca.cx)
Date: Sun Jan 27 2002 - 18:23:48 EET
On Sun, 27 Jan 2002, Remco Poelstra wrote:
> I want to invert a chain, is that possible? If yes, how?
Yes, add a -ea:-100 to the chain. This will invert the phase.
As a quick test:
ecasound -a:1,2 -i foo.wav -a:1 -ea:-100 -a:1,2 -o /dev/dsp
... and you hear nothing as the inverted signal cancels the non-inverted
one. Adding a small delay to the first chain changes the situation:
ecasound -a:1,2 -i foo.wav -a:1 -ea:-100 \
-a:2 -etd:0.5,0,1,100 -a:1,2 -o /dev/dsp
And to hear the effects of cancellation even better, let's
add a sine-oscillator to the mix:
ecasound -a:1,2 -i foo.wav \
-a:1 -ea:-100 \
-a:2 -etd:0,0,1,100 -kos:1,0.05,5,0.1,0 \
-a:1,2 -o /dev/dsp
Yup, sounds like a phaser. :)
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