looking for website that illustrates sound degradation in MP3's

[MikeB06]

I posted this in the Members' Lounge, but since it hasn't seen much traffic and it would be on-topic here, I thought I would re-post it. Even though I need it for a paper, the illustrations I want may be useful or interesting for those encoding MP3's.

I am trying to illustrate in a paper how MP3's are degraded versions of the CD-quality recording. Does anyone know of any good websites that show the frequencies and sound data that are lost when a song is compressed into MP3 format? Possibly showing such things as the soundwave visualization of a 128 kbps MP3 against that of a CD song? If anyone has any good sources, I would be very appreciative

.

 

[LFC_SL]

Quote:

Originally Posted by MikeB06 I posted this in the Members' Lounge, but since it hasn't seen much traffic and it would be on-topic here, I thought I would re-post it. Even though I need it for a paper, the illustrations I want may be useful or interesting for those encoding MP3's. I am trying to illustrate in a paper how MP3's are degraded versions of the CD-quality recording. Does anyone know of any good websites that show the frequencies and sound data that are lost when a song is compressed into MP3 format? Possibly showing such things as the soundwave visualization of a 128 kbps MP3 against that of a CD song? If anyone has any good sources, I would be very appreciative .

em... since MP3 compresses CD audio down so you can fit more songs on an audio player of course there's sound degradation. Why choose this for a paper? I mean, sorry if this is rude + inconsiderate, but isn't it obvious?

Anyway:
http://www.mp3-converter.com/mp3codec/
http://computer.howstuffworks.com/mp3.htm
http://www.oreilly.com/catalog/mp3/chapter/ch02.html
http://www.minidisc.org/aes_atrac.html
http://home.att.net/~wcc.techx/MP3.htm
http://en.wikipedia.org/wiki/MP3
http://www.fliptech.net/bitrate.shtml

the 3rd link seems to be a copy of another link above....
the 4th link is about Atrac (sony's proprietory codec), but still interesting

 

[notnormal]

This site has all the technical information and graphs that you need. Just be sure to give credit to the author!

Discussion of Audio Compression

 

[videocrew]

i think the vast majority of people have NO CLUE that this is the case

 

[LFC_SL]

Quote:

Originally Posted by notnormal This site has all the technical information and graphs that you need. Just be sure to give credit to the author! Discussion of Audio Compression

great site. See you all in a month when I'm thru reading

 

[Latexxx]

The problem is that a graph can't tell what something sounds like. A graph is good for checking low-pass value but that's just about it.
And besides low-passing, an mp3 encoder doesn't actually remove any information. It just saves some samples with less precision than others.