"Mark Tranchant" wrote in message
...
Pete Cross wrote:
Can any of you produce a clean sounding mp3 of a swept frequency test cd
?
the source has to be a commercial cd with a sweep freq track on it. I
suspect not, I played a test cd in a portable cd player with it's anti
jog
feature enabled, it sounded dreadfull but music cds still sounded ok. nb
the
anti jog spins the cd twice it's normal speed and reads ahead into a
buffer
to give it time to recover if it gets jogged, it really messed up the
sweep
from 10kHz onwards.

Surprising. I would have expected the buffer to store the uncompressed
PCM, and potentially improve the sound due to cleaner clocking.

That's exactly what I was thinking. Surely the processor power to compress
and decompress it is more expensive than the memory to store it
uncompressed. But the instructions for my Sony CD player claim disabling the
anti-shock feature gives you better sound quality... odd.