PRELIMINARY STUDY ON RECOMMENDED TIME DURATION OF SOURCE SIGNALS TO BE ANALYZED, IN RELATION TO ITS EFFECTIVE DURATION OF THE AUTO-CORRELATION FUNCTION

A workable model of human auditory–brain system including the auto-correlation function (ACF) and the interaural cross-correlation function (IACF) has been reported [1]. Subjective evaluations can be described by physical factors extracted from both the ACF of sound source and the IACF. The purpose of this study is to find a recommended integration time (2 T)rby using several noise and sound sources existing in an office. Results show the most suitable integration interval from the viewpoints of the loudness and the pitch can be determined in relation to the effective duration (τe) of the sound source.