Subject: Re: [ecasound] gates - major change
From: Jeremy Hall (jhall@uu.net)
Date: Thu Dec 14 2000 - 07:59:21 EET
I looked at one point to make enm do this optionally, I wanted content,
not silence. Tipical use is archiving NAsA Television prudently, ignoring
dead air. After I solve my delay problems, I'll look at this, but now I
am under the gun to get a project out.
_J
In the new year, Kai Vehmanen wrote:
> On Wed, 13 Dec 2000, Jeremy Hall wrote:
>
> > When we do gates now, when the gate is triggerred, frames are written to
> > the output device. When the signal falls below the threshold, we stop
> > writing frames. How then do we maintain synch? If enm, for example, is
> > used, how do we keep from losing continuity?
>
> Yes, you understood right. The new gates (this applies only to -gc and
> -ge) do not guarantee synch nor continuity. This is common for ecasound.
> The engine doesn't guarantee these things, but still, most operators
> behave nicely. Pitch-shifter (-ei) is another operator that directly
> modifies the length of passing buffers (thus causing sync problems if
> multiple chains are used). If we didn't allow this, we'd just have remove
> -ei and the new -gc and -ge complitely...
>
> > This should be a switch, not a force-to.
>
> Of course, if someone needs the old -gc and -ge, we need to come up with
> an alternative. This is no problem. I just don't think the old -gc and -ge
> had many uses. In many cases, the noisegate (-enm, still works as before)
> works a lot better. And there seems to be better (more generic) ways
> to do exactly what -gc and -ge do.
>
> For instance, we could add a controller with params
> -kgc:param,low,high,start-time,len ... notice the 'start-time,len' params
> are exactly the same as with -gc (-gc:start-time,len). To simulate -gc,
> you'd issue:
>
> ecasound -i file.wav -o /dev/dsp -ea:100 -ksc:1,0,100,2,3
> ecasound -i file.wav -o /dev/dsp -gc:2,3
>
> When 'gate' is open, -ksc outputs the lower control value, which in
> this case is 0 (-ea:0 -> mute); when open, the high value is used (100 ->
> -ea:100 -> let signal go through).
>
> But, I can add a switch to -gc and -ge, if you need the old behaviour
> back. Then we'd have -gc:start-time,len,mode ... So we'd have just
> more parameters...
>
> --
> . http://www.eca.cx ... [ audio software for linux ] /\ .
> . http://www.eca.cx/sculpscape [ my armchair-tunes mp3/ra/wav ]
>
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