[linux-audio-dev] TAP EQ problems

[Simon Jenkins]

Alfons Adriaensen wrote:
> On Thu, Aug 04, 2005 at 08:34:59AM -0500, Andres Cabrera wrote:
>
>> Maybe it's denormal problems? You can try adding a noise generator set
>> to a very low level before the plugin, and see if this fixes it.
>> But I would think the tap plugins were denormal safe...
>
> That was my first idea as well, since the problems seemed to start
> shortly after the input became silence. So I downloaded and checked
> the sources. The biquad filter contains explicit denormal-killing code...
>

That FLUSH_TO_ZERO macro doesn't always work though:

http://music.columbia.edu/pipermail/linux-audio-dev/2003-August/004581.html

Unfortunately the "fix" I suggest at the bottom of that mail doesn't always 
work either (it turns out that casting to volatile doesn't do what you might 
hope that it would) hence this alternative:

http://music.columbia.edu/pipermail/linux-audio-dev/2004-June/008739.html

~ Simon Jenkins