is it possible to detect mp3 sourced CDs? |
  |
is it possible to detect mp3 sourced CDs? |
 Oct 14 2003, 06:28
Post
#26
|
|
|
Group: Members Posts: 573 Joined: 22-February 02 Member No.: 1375  |
QUOTE (LordSyl @ Dec 14 2002, 02:51 PM) The frequency analysis is also an accurate way of telling if a CD is mp3 sourced: any original disc always reaches fully 22050Hz without cutting the 20+Khz area. That's absolutely not true, I have a couple of original CDs from the early 80's that are lowpassed at 18KHz, for example (Dio - Holy Diver and The Last in Line) Nevertheless, on most mp3 based files you might note a clear line at 16KHz, and not a lot of content above it. This post has been edited by sony666: Oct 14 2003, 06:30 |
 |
 
|
|
Oct 14 2003, 13:02
Post
#27
|
|
|
Group: Members Posts: 1361 Joined: 25-November 02 Member No.: 3873 |
QUOTE (sony666 @ Oct 13 2003, 09:28 PM) Nevertheless, on most mp3 based files you might note a clear line at 16KHz, and not a lot of content above it. This is not exactly true, though. I have original CD's that have no frequencies higher than 16 kHz…for instance, some songs of the "Bloodhound Gang", but also newer peaces! -------------------- --alt-presets are there for a reason! These other switches DO NOT work better than it, trust me on this.
LAME + Joint Stereo doesn't destroy 'Stereo' |
|
|
|
|
Oct 14 2003, 14:33
Post
#28
|
|
|
Group: Banned Posts: 52 Joined: 16-September 02 Member No.: 3376 |
A good realtime spectrascope is an easy way to tell (baudline is good on linux,
there are probably plenty of winamp vis plugins for this). MP3 has a very "steppy" frequency response due to freq-domain quantization, and it is very easy to tell visually when PCM has been through an mp3 encoder. Cheers, Martin |
|
|
|
|
Oct 15 2003, 06:20
Post
#29
|
|
 Group: Members Posts: 297 Joined: 21-September 03 Member No.: 8934 |
Another thing to consider: if a show was recorded with a DAT at 32khz, the frequencies will cut off at 16. So a cut at 16khz isn't always a 100% reliable clue.
|
|
|
|
|
Feb 9 2005, 07:34
Post
#30
|
|
|
Group: Members Posts: 176 Joined: 5-October 01 Member No.: 217 |
Sorry to bounce an ancient thread, but...
Is just my imagination, or was the some time ago (perhaps a year or so?) a software introduced on this site which was used to analyze audio/cd content and "guess" if the audio has been lossly compressed at some point of production? I have this feeling that I saw this kind of program some time ago, but I am now unable to find it. The search terms just don't cut it:" mp3, lossy, compression, etc.". Anyone recall this one? I want to wipe clean my CD-R collection of lossy stuff. -------------------- http://www.bitburners.com - We Burn a Bit
|
|
|
|
|
Feb 9 2005, 07:54
Post
#31
|
|
 Group: Members Posts: 964 Joined: 29-December 01 Member No.: 830 |
QUOTE (cd-rw.org @ Feb 9 2005, 01:34 AM) Sorry to bounce an ancient thread, but... Is just my imagination, or was the some time ago (perhaps a year or so?) a software introduced on this site which was used to analyze audio/cd content and "guess" if the audio has been lossly compressed at some point of production? I have this feeling that I saw this kind of program some time ago, but I am now unable to find it. The search terms just don't cut it:" mp3, lossy, compression, etc.". Anyone recall this one? I want to wipe clean my CD-R collection of lossy stuff.  Sure. It's auCDtect (command line, freeware)/Tau Analyzer (shareware, GUI-based). - M. This post has been edited by M: Feb 9 2005, 07:55 |
|
|
|
|
Feb 9 2005, 17:50
Post
#32
|
|
 Group: Members (Donating) Posts: 429 Joined: 5-September 04 From: Los Angeles Member No.: 16796 |
QUOTE (M @ Feb 8 2005, 10:54 PM) QUOTE (cd-rw.org @ Feb 9 2005, 01:34 AM) I want to wipe clean my CD-R collection of lossy stuff. Sure. It's auCDtect (command line, freeware)/Tau Analyzer (shareware, GUI-based).Here's the link to my findings: http://www.hydrogenaudio.org/forums/index....ndpost&p=269169 -------------------- Clowns love haircuts; so should Lee Marvin's valet.
|
|
|
|
|
|
Lo-Fi Version | Time is now: 19th June 2013 - 17:25 |
