On Tue, Oct 11, 2011 at 11:17:15PM +0200, Atte André Jensen wrote: > On 10/11/2011 11:07 PM, Fons Adriaensen wrote: >> On Tue, Oct 11, 2011 at 10:57:38PM +0200, Atte André Jensen wrote: >> >>> My question is: is this really a fair way to judge the artifacts >>> introduced by encoding? >> >> No, it's completely invalid. > > That's what my gut-feeling told me! There are at least two good reasons why such a test is not valid. 1. The difference signal doesn't tell you anything about audible differences between two signals. It's fairly easy to make a linear filter (no compression involved) with a perfectly flat response and that nobody would be able to hear. But when you take the difference between in and out it is 3 dB higher than both. 2. Lossy compression is based on combined temporal and spectral masking - some signals you can't hear in the presence of others. Of course when you take away the masking signal they become apparent... Ciao, -- FA _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
