[milkweg]

Quote:

Originally Posted by krmathis /img/forum/go_quote.gif 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.

 

[krmathis]

Quote:

Originally Posted by milkweg /img/forum/go_quote.gif 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.

 

[Pio2001]

Actually, the best codec is the one that removes the most, with the smallest audible impact.

 

[milkweg]

Quote:

Originally Posted by krmathis /img/forum/go_quote.gif 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.

 

[krmathis]

Quote:

Originally Posted by Pio2001 /img/forum/go_quote.gif 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.

 

[LnxPrgr3]

Quote:

Originally Posted by nick_charles /img/forum/go_quote.gif 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.

 

[Reader]

What program is used to get these graphs?

 

[BradJudy]

Adobe Audition

 

[ILikeMusic]

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.

.