[linux-audio-dev] TAP EQ problems

Simon Jenkins sjenkins at blueyonder.co.uk
Thu Aug 4 14:44:57 UTC 2005

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:


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:


~ Simon Jenkins

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