Hi all,


Here what can be readed in the Canonical Manual about the opcode denorm,
reverberation, aud CPU usage :

"Some processor architectures (particularly Pentium IVs) are very slow at
processing extremely small numbers. These small numbers can appear as a
result of some decaying feedback process like reverb and IIR filters. Low
level noise can be added so that very small numbers are never reached, and
they are 'absorbed' by this 'noise floor'.

If CPU usage goes to 100% at the end of reverb tails, or you get audio
glitches in processes that shouldn't use too much CPU, using denorm before
the culprit opcode or process might solve the problem."


My question is very simple : is that really today true, i mean with the
actual processors like Xeon or I7 ? Denorm is very interessant, but if it is
possible to not add some noise...


Cheers,

Sergio



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On Wed, 13 May 2015, COCHEDELAFERTE wrote:
> My question is very simple : is that really today true, i mean with the
> actual processors like Xeon or I7 ? Denorm is very interessant, but if it is
> possible to not add some noise...

I've run into this issue on a fairly recent AMD processor.  I think it's a
real thing.  Bear in mind that if you're recording to a format like WAV,
the quantization noise implied by doing that is many orders of magnitude
greater than what is introduced by denorm.  It is not "adding noise"
in any real way.

Hi Mskala,


OK, thank's very much ! I'll maintain my denorms before the
reverberations...


Greatings,

Sergio



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