Re: [ecasound] I think this has been asked before ... but ... (fwd)

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Subject: Re: [ecasound] I think this has been asked before ... but ... (fwd)
From: Kai Vehmanen (kaiv@wakkanet.fi)
Date: Sat Jan 15 2000 - 17:56:17 EET

Majordomo thought this was a admin-request...

---------- Forwarded message ----------
From: jhall@UU.NET (Jeremy Hall)
Subject: Re: [ecasound] I think this has been asked before ... but ...
To: ecasound-list@wakkanet.fi
Date: Sat, 15 Jan 2000 04:16:55 -0500 (EST)

hmm let me see if I understand this.

so the -ea family of effects in order to get what they want can introduce
antisignal in order that the volume is reduced. so a volume of 0 really
means that the signal strength equals the antisignal strength, the two cancel
eachother out. Applying more in the antisignal direction then
feeding it back to the main signal can cause the new signal to lose.

Perhaps a more constructive way of looking at it would be to digitize a
signal, then apply a predetermined pattern of noise to the signal, thereby
scrambling it. To descramble, simply apply the scrambling pattern as
antisignal, and you get the original signal

By the way, shouldn't all this signal and antisignal coming together
create a bomb?

_J

In the new year, Kai Vehmanen wrote:
> On Fri, 14 Jan 2000, Jeremy Hall wrote:
>
> > but I do not wish mono signal output.
>
> If you don't convert to mono, it will depend on the listening
> environment. With headphones, you won't hear any difference (no
> phase cancellation inside your head :)). Even with a nicely balanced
> stereo monitoring system, it won't work really well. Of course there
> are more sophisticated ways to do this, but they are much more complex
> and difficult to implement.
>
> > Is there a inversion effect with ecasound?
>
> -ea:-100 and -eac:-100,channel
>
> Here's a simple example:
>
> ecasound -a:1,2 -i track.wav \
> -f:16,1,44100 \
> -a:1 -o channel-1.wav \
> -a:2 -o channel-2.wav -erc:2,1 -ea:-100
>
> Now combine them with:
>
> ecasound -a:1 -i channel-1.wav \
> -a:2 -i channel-2.wav \
> -f:16,1,44100 -a:1,2 -i track-mono.wav
>
> And that's it, you'll only hear hard-panned signals in the resulting
> file.
>
> --
> Kai Vehmanen <kaiv@wakkanet.fi> -------- CS, University of Turku, Finland
> . http://www.wakkanet.fi/ecasound/ - linux multitrack audio processing
> . http://www.wakkanet.fi/sculpscape/ - ambient-idm-rock-... mp3/ra/wav

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