Factors to be Measured of Environmental Noise and Its Subjective Responses Based on the Model of Auditory-brain System
Yoichi Ando and Robert Pompoli
An idea of modern system of measuring sound and noise for its identification and subjective evaluations is based on the model of auditory-brain system developed for concert hall acoustics [Concert Hall Acoustics, Springer-Verlag, Heidelberg, 1985; Architectural Acoustics, Blending Sound Sources, Sound Fields, and Listeners, AIP Press/Springer-Verlag, New York, 1998]. The model consists of the autocorrelation, interaural crosscorrelation mechanisms, and the specialization of human cerebral hemisphere. It is worth noticing that the power density spectrum is identical with the autocorrelation function of the signal. In order to describe primary sensations and any important subjective responses, three temporal factors extracted from the autocorrelation function and four temporal factors from the interaural crosscorrelation function are taken into consideration. A theory is reviewed here for identification and subjective evaluations, which would contribute to reduce the environmental noise properly.
Key words: noise-measurement method, factors, auditory-brain model, subjective effects