A general method to measure the subjective quality of audio devices is developed using the concept of internal sound representation. A model of the human auditory system is used to calculate the internal representation of the input and output signals of an audio device. The transformation from the physical domain to the psychophysical (internal) domain is performed by way of two operations, time-frequency spreading and level compression. These operations permit describing the masking behavior of the human auditory system at and above masked threshold. Moreover, the subjectively perceived audio quality can be assessed. The perceptual audio quality measure (PAQM) shows an increased correlation with the subjectively perceived audio quality as compared to quality measures that use the masked threshold concept.
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