Quote:
Originally Posted by Ruined
The Nyquist Theorem. Also, there are a ton of tests that indicate on the hydrogenaudio forums that 19-20khz+ is inaudible to humans, and people cannot tell the difference between an uncompressed CD and a 256kbps MP3/192kbps WMA - which both happen to roll off frequencies above 19-20khz+ depending on the parameters.
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I'm not challenging the Nyquist Theorem but I've run into an exception of the example you cite above about CD audio. I increased the sampling rate of iTunes from the default of 128 kbps to 320 kbps because the iPod owner was dissatisfied with the audio quality of the music she ripped from CDs she owns. I increased the bitrate gradually, first starting at 192 kbps and then 256 kbps. As I increased the bitrate, I would play the original CD version first and then the ripped version. When I increased the bitrate to 320 kbps, she thought the ripped version sounded better than the original CD.
Others I've talked with who own iPods are happy with the default sampling rate, which does lend itself to support your example above.
I guess the bottom line is it really depends on the sensitivity of the ears of the listener.
Peace...