Estimating the characteristic vibrations of a sound field in a room using coefficient of variation in the power spectrum of a decay-cancelled impulse response

Abstract

Estimating the characteristic vibration distribution of a room sound field is difficult because the half-power bandwidth of the characteristic vibrations broadens due to room impulse response decay. Therefore, a coefficient of variation in a power spectrum of a decay-cancelled impulse response is proposed for estimating the characteristic vibrations of a room sound field. In the decay-cancelled impulse response, only the decay of the impulse response is cancelled. Cancelling the decay narrows the half-power bandwidth, thus enabling a clearer estimation of the characteristic vibration even in a sound field with a short reverberation time. In this study, sound fields with different characteristic vibration distributions were numerically simulated to investigate whether the coefficient of variation could estimate their difference.