Re: Music Transmission Index

As already suggested, the music transmission index is another term for an objective sound quality metric, such as the PESQ and PEAQ. This is a very interesting topic where quite some progress has been made within ITU for standardized metrics. These metrics are usually relative to 'perfect' as they require a reference signal, i.e. the original source signal. This can easily be obtained when the device under investigation is a codec, a transmission line or similar, but in other cases a reference is not available. Examples are loudspeakers (there is no perfect acoustical transducer) and hearing aids (there are deliberate modifications to the signal). A few measures have been developed without reference, one being my Ph.D. thesis (surprise:-), which was an investigation on the feasibility of an objective measure for estimation of reproduced sound quality in hearing aids. Both normal-hearing and hearing-impaired listeners were modeled.

I have just published a summary paper on my thesis in the recent issue of Acta Acustica:

L. Bramsløw (2004): An Objective Estimate of the Perceived Quality of Reproduced Sound in Normal and Impaired Hearing, Acta Acustica 90(6), 1007 - 1018

This issue has a thematic section based on the 2003 ISCA workshop on 'Auditory Quality of Systems' and contains several interesting papers that are good starting points for an overview of sound quality measures. See:

My thesis (3 out of 4 reports) is available here:

Objective Scaling of Sound Quality for Normal-Hearing and Hearing-Impaired Listeners :

A neural network model for prediction of sound quality:

An auditory model with hearing loss:

I hope this can be of help.



Lars Bramsløw Oticon A/S Strandvejen 58 Hellerup DK-2900 Denmark +45 39 13 85 42 Direct +45 39 17 71 00 Main