[vdr] Re: Linear volume response in VDR

[Dominique Dumont <domi.dumont@free.fr>]

Udo Richter <udo_richter@gmx.de> writes:

> Of course, if anyone knows what kind of non-linearity is behind the
> volume control, this would be even better.

The sensitivity of the ear is proportional to the logarithm (base 10)
of the power.

Hence the power must be proportional to 10**Volume (or 10^Volume).

In your case a formula like this should do the trick:

Vol = 1 - 10**(Volume/coef) ;

For Volume=0 -> Vol = 0;

Your should compute the coef so that the maximum value of Volume will
give the max value of Vol (2**32 ?)

Hope this helps