Subject: Re: mp3 and the perceptual coding From: Laszlo Toth <tothl@xxxxxxxx> Date: Thu, 25 Mar 2010 13:37:16 +0100 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>On Thu, 25 Mar 2010, Massimo Grassi wrote: > I would like to convince to my students that psychophysics can (seldom) > be useful. For this reason, I want to talk about mp3 and perceptual coding. I usually do the following demonstration: take a speech sample, compress it with an mp3 codec at the highest possible compression rate, then decompress it and display the spectrogram of the original and the processed signal. The spectral valleys are wiped out, while there is minimal perceptual difference. I think this quite convincingly demonstrates that masking indeed works, and that the industry can make use of the results of psychophysics. Laszlo Toth Hungarian Academy of Sciences * Research Group on Artificial Intelligence * "Failure only begins e-mail: tothl@xxxxxxxx * when you stop trying" http://www.inf.u-szeged.hu/~tothl *