Head-Fi.org › Forums › Equipment Forums › Sound Science › A visual comparison of mp3 320k, 192k, and FLAC
New Posts  All Forums:Forum Nav:

A visual comparison of mp3 320k, 192k, and FLAC - Page 2

post #16 of 24
11/19/08 at 9:22am
Quote:
Originally Posted by krmathis View Post
Yeah, its quite obvious that audio data get lost during lossy encoding.
Hence I stick with lossless!
Those charts are quite meaningless IMO. How much of the light spectrum do you think you can actually see? Not very much at all. Audio compression works by removing the frequencies we can't hear. If you over compress then it removes some of the frequencies we can hear but compression at 192kb/s and above does not in my experience. YMMV.
Reply
post #17 of 24
11/19/08 at 2:16pm
Quote:
Originally Posted by milkweg View Post
Those charts are quite meaningless IMO. How much of the light spectrum do you think you can actually see? Not very much at all. Audio compression works by removing the frequencies we can't hear.
You probably mean "lossy Audio compression works by removing the frequencies we can't hear.".
I agree that these charts are meaningless though. Cause you don't even need a chart to tell that there are data loss with a lossy codec, and a chart can't tell if the loss are audible or not.
Reply
post #18 of 24
11/19/08 at 8:14pm
Actually, the best codec is the one that removes the most, with the smallest audible impact.
Reply
post #19 of 24
11/19/08 at 9:17pm
Quote:
Originally Posted by krmathis View Post
You probably mean "lossy Audio compression works by removing the frequencies we can't hear.".
Yea, I get what you mean because flac uses compression too.
Reply
post #20 of 24
11/20/08 at 5:56pm
Quote:
Originally Posted by Pio2001 View Post
Actually, the best codec is the one that removes the most, with the smallest audible impact.
True!
But sadly there are no "perfect" lossy codec.
Reply
post #21 of 24
11/20/08 at 8:54pm
Quote:
Originally Posted by nick_charles View Post
Doh !, you are of course completely right, I am being silly.

here is masking
There is also temporal masking -- a loud sound can even mask a quieter sound that has already happened.
Reply
post #22 of 24
5/9/09 at 1:29am
What program is used to get these graphs?
Reply
post #23 of 24
5/9/09 at 11:17am
Adobe Audition
Reply
post #24 of 24
5/9/09 at 12:08pm
As many have already pointed out it's not necessary to prove a difference, no one ever doubted a difference, and it's fully expected that there will be a difference. The point of lossy encoding is to achieve perceptual transparency and nothing else. Graphs like these may be interesting to those with a technical interest in codec design but they say absolutely nothing about perceptual audio quality.

As long as everyone understands that then we can pick the graphs apart if we like, but let's understand that it all means nothing with respect to 'grading' lossy encoding. Only listening tests can do that.

.
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Sound Science
Head-Fi.org › Forums › Equipment Forums › Sound Science › A visual comparison of mp3 320k, 192k, and FLAC