2010/4/10 Werner Van Belle <werner@xxxxxxxxxxxxxxx> > Raymond Yau wrote: > > The dynamic range of 16bit audio is 96dB > > http://en.wikipedia.org/wiki/Dynamic_range > > > Yes about that. I always wondered how they come up with 96dB ? > > A perceived doubling of volume is normally assumed to be +3dB, > (log_10(2)=0.3) which means that if you have 16 bit audio you have 16 > 'doublings', or in essence only 48 dB. Even worse, since the last bit is > a sign bit, you essentially can only achieve a dynamic range of 45dB ! > > Now, I know this is off topic, but I never heard any good explanation > why CD audio is suddenly 45 dB ? If anybody knows, please share your > thoughts ! > > Wkr, > > Even when you are using floating point number Floating point numbers provide a way to trade off signal-to-noise ratio for an increase in dynamic range. For n bit floating-point numbers, with n-m bits in the mantissa and m bits in the exponent DR is still a finite number http://en.wikipedia.org/wiki/Signal-to-noise_ratio _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
