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

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Subject: Re: [ecasound] I think this has been asked before ... but ...
From: Kai Vehmanen (kaiv@wakkanet.fi)
Date: Wed Jan 12 2000 - 13:31:39 EET

On Tue, 11 Jan 2000, Jeremy Hall wrote:

> I want to supply negative numbers to -epp, as well as supplying numbers
> greater than 100.

Hmm, I don't think you do. ;) Currently ... -epp:0 does the same
as -eac:0,1 ... -epp:100 is same as -eac:0,0 ... So if -epp is isn't
enough, channel-amplify should do it.
        
> ecasound -a:1,2 -i /tmp/in.raw -o /tmp/out.raw -a:1 -epp:-20 -a:2 -epp:70
[...]
> This has the fortunate effect of chopping a center channel out when
> combined.

Hmm, can you explain this some more...?

> Ideally, we could have two new effects that would be similar to a band
> pass and band reject filter, except these are ban-pan-pass and
> band-pan-reject filters. In a pan reject filter, supplying a center of
> say 75 and a width of 50 would dump the right channel. A more
> constructive use would be to try to mute a center channel, or accentuate

Now I'm confused. ;) If you want to find the common parts (= center
channel) between different channels, I'd suggest using
a combination of -eac:-100,channel (invert phase) and various filters.
Panning won't do you much good. Hope I understood what you meant to say. 

-- 
Kai Vehmanen <kaiv@wakkanet.fi> -------- CS, University of Turku, Finland
 . http://www.wakkanet.fi/ecasound/ - linux audio processing
 . http://www.wakkanet.fi/sculpscape/ - ambient-idm-rock-... mp3/ra/wav

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