[sdiy] OT: Scratchy CDs

[Ola Andersson]

On Wednesday 01 October 2003 18:16, you wrote:
> There is the low level parity check (well, actually it's two parity
> checks in a row) in each frame, which contains 6 stereo samples. It takes
> 588 channel bits (pit/land bits) to code those 6 samples (192 payload
> bits) - that's quite a ratio...
> And for the question, whether ripping an audio track does error
> correction - I think it's safe to assume that low level correction does
> take place, but high level correction can't be used - it's simply not
> present on an audio CD.

Well, a parity check isn't error correction, only error detection.
The question is what do ripping programs do when they detect a parity error?
I think professional CD players tries to guess the correct sample values 
(interpolation or something).
For ripping CDs, see www.exactaudiocopy.de, this program tries to do it right.

-- 
Ola Andersson
http://cullyn.ling.umu.se/synthdiy