[LAD] [LAU] mudita24 1.02 -- improved envy24control mixer/router for ice1712-based sound-cards

[Gordon JC Pearce]

On Sat, 2010-08-14 at 22:51 +0200, fons at kokkinizita.net wrote:
> On Sat, Aug 14, 2010 at 12:19:33AM -0700, Niels Mayer wrote:
> 
> > The big issue with having the full 144dB range is that the "business"
> > end of the slider is all at the top,
> 
> I've never seen a real fader that has any practical resolution 
> below -80 dB: the next tick, 5mm or so down,  is 'Off'. And most
> don't even go down that much.

I'm sure most people on here know this, but the decibel scale is a
relative logarithmic scale.  Saying "-80dB" means that whatever went in
was attenuated by 80dB, or 1x10E8 - if you put in a 1V signal, a 0.01µV
signal will result.  For normal line level, that would be 0.007µV, or
7pV, yes picovolts!  At 24-bit sampling for full-scale line level
(0.707V), the LSB encodes a value of 0.042µV, and at 16-bit sampling
that becomes 10.8µV - well below what your attenuator is letting
through.

For what it's worth, the channel faders on my Yamaha O1v go down to
-60dB, with "infinity" being the bottom stop.  To find what the values
discussed above would be at -60dB, multiply the voltages by 100.

Gordon MM0YEQ