On Sat, 2010-08-14 at 22:51 +0200, fons@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
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Received on Sun Aug 15 12:15:02 2010
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