[PD] feedback control

B. Bogart ben at ekran.org
Mon Mar 21 16:08:32 CET 2005

I've used the getner before, and have been exposed to the vortex. These
are in the class of "echo suppression" do deal with a lag between the
input and the output (mics and speakers). Often used in video
conferencing and other open mic/speaker setups.

they are HELL to configure and expensive...

I think McGill or UQAM are working on software echo-suppression stuff.... ?


sven wrote:
> I know some because I did a
> http://www.google.com/search?q=%22feedback+suppressor%22&sourceid=opera&num=0&ie=utf-8&oe=utf-8
> just a few minutes ago...
> sven.
>> That strategy seems like it'd be good for a piece of dedicated
>> hardware to do. Do you know of any?
>> -Ian
>> sven wrote:
>>> hi robert,
>>> feedback suppression should be quite easy to achive w/ the vasp
>>> external.
>>> fft the incoming signal. check if there are 1 or 2 bands which are
>>> much louder than their neighbours.
>>> if so multiply that bands which an adjustable value <1 and than take
>>> the ifft.
>>> feedback noise is a pure sine (until it's getting so loud that it'
>>> distorts) so
>>> they don't have overtones and cause a significant peak in at most 2
>>> neighbouring bands.
>>> sven.
> _______________________________________________
> PD-list at iem.at mailing list
> UNSUBSCRIBE and account-management ->
> http://iem.at/cgi-bin/mailman/listinfo/pd-list
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 256 bytes
Desc: OpenPGP digital signature
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20050321/963d9464/attachment.pgp>

More information about the Pd-list mailing list