Subject: Re: Music Transmission Index? From: "William C. Treurniet" <wtreurniet(at)rogers.com> Date: Tue, 11 Jan 2005 14:54:50 -0500In 1998 and 2001, the International Telecommunications Union (ITU) published a recommendation for the objective quality measurement of music, particularly music that has been degraded somewhat by lossy compression algorithms such as mp3. The measurement method, called PEAQ for "Perceptual Evaluation of Audio Quality", compares physical attributes of a processed audio signal with the original signal. The method was calibrated using data from a number of human listening experiments conducted in several laboratories. Generalization tests using data from new experiments gave correlations well over .8 between the PEAQ measure and average subjective quality ratings. Correlations between simple SNR and average subjective quality ratings were always much lower. The PEAQ quality measure might be considered a "Music Transmission Index". Links to information about PEAQ may be found at http://www.peaq.org/prod02.htm Regards, William Treurniet