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This came from a physicist for Lockheed Martin, whom I've know since high school. Works in Boulder. ---------- Forwarded message ---------- Date: Thu, 23 Jan 2003 19:29:31 -0700 From: "Dent, Roy" <[log in to unmask]> To: 'Premise Checker' <[log in to unmask]> Subject: RE: In a Single DVD Changer, Hundreds of Movies and MP3's Sounds plausible to me-- Say the highest frequency you want to reproduce is 20KHZ. The Nyquist criterion says you need to sample the waveform at at least twice the highest frequency, or 40K samples per second. Depending on the number of quantized levels you need to accurately reproduce the waveform (e.g. 1024 distinct levels would require 10 bits=1.25 bytes), you come out at about 50K bytes/sec.) Higher resolution would up the data rate beyond that. This is of course all speculation on my part, since I don't know how they encode digital music. I believe that there are redundancy reduction (data compression) algorithms in use that bring the storage requirement back down.