Re: another control API issue

[Abramo Bagnara <abramo@alsa-project.org>]

Paul Davis wrote:
> 
> >Just for curiosity, what they store that cannot be represented in 32
> >bits?!?
> 
> RMS meters. It seems that the 64 bit-ness comes from it being some
> kind of fixed point representation - the value that you read from the
> registers need scaling (in user space, presumably) by a floating point
> transformation to actually become true RMS values. so its not so much
> they they need 64 bits of precision, more that the hardware needs to
> do the math with this type of data format. keep in mind the
> computation is all being done on a Xilinx FPGA, not a DSP chip, so the
> arithmetic options are (at this time) a bit limited.

I expected something similar. Don't you think that to have a FLOAT type
is a better choice (more card independent, more accessible, more
representative, etc.).

-- 
Abramo Bagnara                       mailto:abramo@alsa-project.org

Opera Unica                          Phone: +39.546.656023
Via Emilia Interna, 140
48014 Castel Bolognese (RA) - Italy

ALSA project               http://www.alsa-project.org
It sounds good!

_______________________________________________________________

Have big pipes? SourceForge.net is looking for download mirrors. We supply
the hardware. You get the recognition. Email Us: bandwidth@sourceforge.net