3D Impulse Response Measurements of Spaces Using an Inexpensive Microphone Array

Abstract

The acoustical characteristics of a room are traditionally determined using omnidirectional impulse response measurements, yielding information about sound reflections in terms of magnitude and time, but not direction. However, the direction of reflections is often important, and thus the need for a practical, low cost measurement system for determining this. In this paper we present the performance of a low cost measurement system utilising an inexpensive microphone array, namely the Core Sound TetraMic, for the determination of 3D room impulse responses. These can then be visualised, for example, as a "hedgehog pattern". Experiments undertaken in an anechoic chamber indicate that the accuracy of directional estimation of this system is in the region of ± 7.5°.

Parametric Late Reverberation from Broadband Directional Estimates

“…This implies that the impulse response of such a low-pass filter distributes energy in time, effectively acting as an analysis window as well. Sometimes, PIV estimation has also been done blockwise [21].…”

Acoustic visualizations using surface mapping

“…The low spatial resolution of these techniques precludes associating, e.g., individual acoustic reflections with the particular reflecting surfaces from which they originated. Now, high spatial resolution microphones and spatial processing software are becoming increasingly available to mass market consumers (Protheroe and Guillemin, 2013), and spatial analysis can reveal perceptually important spatial features of sound fields (P€ atynen et al, 2014).…”