Abstract
In our sound environment, there are various complex sounds including both stationary and non-stationary sounds. It is important to evaluate the loudness of these sounds, to clarify the relation between the loudness and the physical metrics and to estimate the loudness by the physical metrics in order to evaluate and control the sound environment. The temporal patterns of non-stationary sounds in daily life environment, such as road traffic noise, construction noise, speech and music, are different from each other. It would be desirable to evaluate the loudness of both stationary and non-stationary sounds with various temporal and spectral characteristics by the same metric in the evaluation of the loudness. It is needless to say that the metric should have a good relation with the subjective impression. From physical viewpoint, sounds with various temporal patterns including stationary sounds can be measured by a single scale on the basis of energy. In this paper, a single common metric for the evaluation of the loudness of both stationary and non-stationary sounds is examined by conducting psychological experiments.
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