John West McKenna wrote: > That's not correct - Audio CDs have extremely good error correction. You If you use them for the goal they have been invented for, yes. > can completely remove all data in a slice a couple of mm wide with no > effect on the output at all. Correction - no -audible- effect on the output. CD-players are fairly good in interpolating a signal (which isn't that difficult, as long as it's music). CD-ROMs are stuffed with CRC-checks, and have a considerably lower capacity than a bare CD-audio. The maximum capacity of a cd-Audio is 441000 (samples/s) * 4 ( bytes/sample) * 74 * 60 = 746.9 MB, while the maximum capacity of a normal CD-ROM is only 650 MB. The differences are purely CRC-codes and similiar anomalies :) > Part of the design spec for CDs was that they had to be very cheap to make. > That means the information on them has to be very tolerant of manufacturing > faults. That means very good error correction. Let me put it this way. Suppose there's an error somewhere on a CD, say for 100 samples. The CD just can't read it, and has to interpolate, and inserts data that won't sound too awful. A human mind won't notice the difference, since its a) a very short error (2 ms) and b) masked. However, in our case, 100 bits would have been lost. -- Martijn van Buul - Pino@dohd.cx - http://www.stack.nl/~martijnb/ Visit OuterSpace: mud.stack.nl 3333 finger email@example.com for my public key block - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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