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

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To: <linux-audio-dev@...>
Date: Sunday, August 15, 2010 - 8:50 am

On Sat, 2010-08-14 at 22:51 +0200, fons@kokkinizita.net wrote:

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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Re: [LAD] [LAU] mudita24 1.02 -- improved envy24control mixe..., Gordon JC Pearce, (Sun Aug 15, 8:50 am)