In message , Pete Cross writes
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.


I've tried to do this, using the LAME codec at 192k bps. I also
attempted MP3s of white noise and pink noise for speaker analysis. I'd
advise you to forget it. The frequency response you get on playback is
not good enough. (As a result of the perceptual coding algorithm.)
--
Chris Morriss