Big Nerd Ranch on NPR and thoughts on HD Audio

NPR covered Big Nerd Ranch for a few minutes today. The NPR guy talked about how the programmers were talking about the Spotlight API.

On an unrelated note:

Note: I am not necessarily talking about HD Radio.

HD Audio is of no real use for the simple reason that humans can’t hear any frequencies above 20 kHz. CD quality audio is the best quality audio that humans can appreciate. Who cares if you have 192 kHZ sampling rate (HD Audio) as opposed to CD audio’s sampling rate of 44.1 kHz? Oh, but they all say, “You can hear the difference.” One should say “Only if there is something wrong with your ear or brain!” (This post was inspired by a short aside in a DSP lecture, but any inaccuracies here are mine).

Note: I am writing this pretty late at night..I might have made some mistakes with the exact facts :p

More info(April 3, 2007, 10:48 am) : The reason for sampling at a bit more than twice the maximum frequency is to enable correct reconstruction of the analog signal(music and other audio in this case). You can find more information on the Nyquist-Shannon Sampling Theorem here.

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