In article .com,
Dave wrote:

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.

To get a good measure I'd expect some Fourier transforms and signal
analysis to be done, so this should be relevant to sci.physics.

CBS television news played part of a Beatles song because they were
talking about Paul's divorce. It was in tune. It is slightly out of tune
on the two or three CD versions I have of it. It went through the
optical cable to a Harman Kardon AVR 240 from a cable TV box 48 Khz PCM.

John Lennon answered a question "Why is The Beatles music so popular?",
He said, "We don't know. We really don't know. If we knew we would be
managers."

The Beatles liked the movie "The Girl Can't Help It." starring Jane
Mansfield, about a couple of gangsters who controlled the jukebox
business.

I can't demonstrate how the 30 to 40 year old music was perfectly in
tune years ago to my nephews and nieces. They like the music, but they
will probable never know what all the excitement was about.

Maybe you just have to know who to bribe and how much to pay if you want
to communicate a voice or guitar note that is perfectly in tune to the
public. Maybe MP3, aiff, SACD etc. doesn't make that much difference.

Cliff Nelson

Dry your tears, there's more fun for your ears,
"Forward Into The Past" 2 PM to 5 PM, Sundays,
California time,
http://www.geocities.com/forwardintothepast/
Don't be a square or a blockhead; see:
http://bfi.org/node/574

http://library.wolfram.com/infocente...s=1;search_per
son_id=607