[LAD] zita-mu1 denormals

[Raphaël BOLLEN]

On 03/27/2013 12:48 PM, Fons Adriaensen wrote:
> On Sun, Mar 24, 2013 at 05:18:40PM +0100, Raphaël BOLLEN wrote:
>
>> Thanks for looking into this, I can't check for NaNs or Infs right
>> now but I've tried with an output from JAAA and have the same
>> result. Anyways the problem is solved with denormals protection as
>> suggested by Herman.
>
> The code was supposed to be denormal-protected without those
> patches, and I've found out why it isn't.
>
> cmeterdsp.cc, lines 64,65 should be:
>
>      zl += _w1 * (*pl++ - zl) + 1e-15f;
>      zr += _w1 * (*pr++ - zr) + 1e-15f;
>
> The current code uses 1e-20f as the offset. This is more than
> enough to avoid denormals in the lowpass filters, but in the
> following lines zl and zr are squared, and 1e-40f definitely
> is denormal.
>
> The same code is also used in jkmeter and jmeters. All will
> be updated.
>
> Ciao,
>

I confirm this also works for me.

Best regards

--
Raphaël.