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, > > > http://en.wikipedia.org/wiki/Decibel When referring to measurements of amplitude it is usual to consider the ratio of the squares of *A*1 (measured amplitude) and *A*0 (reference amplitude). This is because in most applications power is proportional to the square of amplitude, in electrical circuit , dissipated power is typically proportional to the square of voltage or current _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
