[Arny Krueger]

"Dave" wrote in message
oups.com

I have been disappointed with the audio quality of some
CDs I have bought recently. Is there a free program I
can use to get an accepted measurement of fidelity? (like
a signal to noise ratio)

I have my suspicious that some may have been stored an
MP3s and then "unripped" in the factory. So how can I
tell for certain if my CD has been an MP3, or other lossy
format? I'd hope mp3 storage would leave different
markers than the original tape, for example.

Spectal analysis can give strong evidence. Most MP3 files show signs of a
brickwall low pass filter the audio band - sometimes as low as 15 KHz or
less.