> and more exactly speaking, 16kHz cutoff is used when compression ration
> is bigger than 9.
>
> converting 44.1kHz 16bit stereo PCM into 128kbps mp3, the ratio is about
> (44100 * 16 * 2) / (128 * 1024) = 10.7
> so 16kHz cutoff is used.
>
> converting 32kHz 16bit stereo PCM into 128kbps mp3, the ratio is about
> (32000 * 16 * 2) / (128 * 1024) = 7.8
> so 16kHz cutoff is not used.
this makes me wonder... how exactly do you get energy at frequencies
above 16khz from a 32khz input? is that meaningful, since it is above
nyquist?
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