Re: newbie question on cglame

[Brian L. <bli...@ad...>]

Richard,

You have made my day, kind sir, if not my week.  Your code snippet and
fixes to glame.scm worked *perfectly*.  I cranked a test file through just a
few minutes ago, and sounded just like you'd expect after being run through
a low-pass filter.

Many thanks... for both the prompt reply (less than 24 hrs... wow!) and the
flawless fix.

Brian Lindholm


> On Wed, 8 May 2002, Brian Lindholm wrote:
>
> > Gentlemen,
> >
> > Earlier this evening I successfully compiled glame-0.6.2 on my Debian
> > 2.2r6 box.  I'm hoping to use cglame to run a *large* number of sound
> > files through a low-pass filter for purposes of lessening tape hiss.
> >
> > Unfortunately, I'm completely unfamilier with Scheme, and my efforts to
> > run even a single .wav file through a low-pass filter are failing
miserably.
> > How do I do this in cglame?  If somebody could provide a sample
> > command sequence that would run a single .wav file through the low-pass
> > filter, I'd be enormously appreciative.
>
> You can use the pre-defined save-eff scheme procedure for this. Example
> use for lowpass filter use is
>
> cglame> (save-eff "test.wav" "test_filtered.wav" '("lowpass" ("stages" 4)
> ("cutoff" 500) ("ripple" 0.5)))
>
> Note that you need to change all occurrences of filter-set-param to
> filter-set-param! in src/glmid/glame.scm (applied this bugfix to the
> v0_6 branch already). Also you may want to change the (net-run net)
> part of the save-eff procedure to (net-run net (* 64 1024)) and adjust
> the net-run definition to read
>
> ; run the net, wait for completion and delete it
> (define net-run
>   (lambda (net . bufsize)
>     (if (null? bufsize)
> (filter-launch net)
> (filter-launch net (car bufsize)))
>     (filter-start net)
>     (filter-wait net)))
>
> to speed up computation (it sets larger buffer size for processing,
> default buffer size is 1024 if I remember correctly).
>
> Hope this helps, Richard.
>
> Btw. all the above changes went into the v0_6 branch.
>
> --
> Richard Guenther <ric...@un...>
> WWW: http://www.tat.physik.uni-tuebingen.de/~rguenth/
> The GLAME Project: http://www.glame.de/