An experimental analysis method for the incident sound field using propagation mode expansion: Study on the incident sound field in the insulation performance measurement for partition walls. part 1

Abstract

In the measurement of the level difference between dwelling rooms, the low-frequency modal density of the source room is not high enough for the incident sound field to be assumed as a random incidence, and the sound field is expected to be strongly influenced by the standing waves of the room modes. In this paper, an experimental method is proposed to analyze the characteristics of the incident sound fields in dwelling rooms, where the propagation mode expansion is applied to the complex sound pressure observed on the two layers of planar microphone array. The proposed method is applied to numerical models to simulate the incident sound fields to obtain information on its accuracy and application limitations, and the applicability of the method to ordinary rooms is discussed. In addition, the effect of room absorption on incident characteristics is demonstrated using the proposed method. Keywords sound insulation measurement, incident sound field, sound field decomposition, propagation mode, directivity This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

A comprehensive assessment of room acoustics to achieve acoustic comfort: a case study of retrofitting for speech intelligibility in a residential space

“…Moreover, these studies [10], [12]- [18] focus only on a part of the factors involved in acoustics comfort perception. They either focus on architectural acoustics and human perception [4], [9]- [18] or the physics of sound [21]- [23], [36], [37] but rarely all together. There exist gaps in the literature in providing a holistic picture of acoustics -transcending the fields of sound physics, architectural acoustics, human speech, and auditory perception, comfort, and well-being.…”

An experimental study on the influence of incident characteristics on sound insulation between rooms: Study on the incident sound field in the insulation performance measurement for partition walls. Part 2

“…In the previous paper, 6 the authors focused on the incident sound field in the source room as a factors of the sound insulation performance between rooms. The separation of the incident waves using the propagation mode expansion was proposed as an experimental method for understanding the sound field characteristics (hereinafter referred to as the proposed method).…”

Diffuseness Quantification in a Reverberation Chamber and Its Variation with Fine-Resolution Measurements

“…There are several reasons for the non-diffusivity in reverberation chambers. First, in a room with a small volume, it can be challenging to achieve the diffuse sound field in the low frequency due to low modal density [7]. Second, paralleled walls or a lack of scattering elements make it difficult for an ideal diffuse condition [8].…”