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This is an interesting article on CD reproduction of high-frequency noise, especially the graph. I hadn't realized that the approximation was that far off.

The CD reproduction depicted in that graph is indistinguishable from the original. The tone is 10KHz, and the CD reproduction clearly has a very strong 10KHz component. The difference between the CD reproduction and the original tone consists entirely of frequencies too high to hear. The people who chose the sampling frequency of CD audio were not idiots, they were audio engineers. The subsequent people who chose a higher frequency for DVD audio were also not idiots, but they were marketers. 192KHz audio is snake oil. AFAIK no human listener has ever distinguished 44.1KHz audio from 192KHz audio in a double-blind test.

Peter