The Comparison between Subjective and Objective, Perceptual Based Evaluation of Compressed Speech and Audio Signals

Piotr Kozlowski, Andrzej Dobrucki
This document displays research about objective methods, which use psychoacoustics knowledge for estimation of the quality of audio signals. These methods are used for evaluation of the quality of signals coded perceptually, what is connected with loss of some information in order to obtain lower signal flowability. The software written especially for this research is presented in the paper. This program provides evaluation of the quality of perceptual coded audio signals by means of different
more » ... ethods. A few protocols are ready to use: • PAQM Perceptual Audio Quality Measure, • PSQM Perceptual Speech Quality Measure, • NMR Noise to Mask Ratio, • PEAQ PErceived Audio Quality, • PESQ Perceptual Evaluation of Speech Quality. All of these algorithms are used for simulation of the auditory system behavior. The software is open for addition next protocols as the plug-ins. The result of the presented algorithm is the difference between "hearing senses" obtained by these ways. These senses are results of the listening of the original and degraded signal. A group of musicians and students familiar with acoustics participated in subjective evaluation. The same audio material was used for subjective and objective evaluation. Some examples of music signals (rock, classic, electronic, pop and jazz) as well as female and male speech were used as the listening materials. The comparison between results of subjective and objective evaluation is presented at the end of paper.