An intrinsic reverberation chamber with non-parallel walls, ceiling not parallel to the floor, at most two walls placed perpendicular and with fixed field diffusers is presented. Inside this room no eigenmodes exist and a diffuse, statistically uniform field is created without the use of a mechanical mode stirrer. As a result, test time can be reduced drastically compared to mode stirred reverb...

The reverberation time is a key feature for describing the acoustic properties of a reverberant room. It can be computed from a measured Room Impulse Response but in many applications it has to be estimated blindly. Existing blind methods give accurate estimates but they often exhibit high variance across different speakers. In this paper, a low variance blind estimator of the reverberation tim...

The Audio Arts and Acoustics department at Columbia College in Chicago acquired a new building in 2003. The facility, a former bank, contained an old steel and concrete vault that was converted to a reverberation chamber. The acoustic properties of the space, including reverberation time, modal density, and early reflection maps were analyzed and compared to a computer model. Reflectograms were...

In this paper we address the issue of estimating the time delay of arrival in underdetermined case. We develop a method using the excitation characteristics of the speech production. This method is based on the cross correlation of the Hilbert Envelops of linear prediction residuals derived from two microphones signals. The method has been applied to real data obtained by recording many sources...

There is a growing number of large spaces but their sound fields have not been studied systematically. The aim of this study is to explore the behaviour of reverberation time and sound pressure level in this kind of spaces. Acoustic measurement was carried out in two large spaces. The results show that in the near-source field, the sound pressure level and reverberation time vary rapidly with t...

Abstract As a concept, an indoor soundscape is innovative approach to building environments with shape that "sounds good," meeting the preferences and needs of occupants established according their unique perception. This paper presents assessment regarding objective acoustic parameters such as equivalent noise levels (Leq) reverberation time (RT), subjective method including questionnaire surv...

When active radar and <span>sonar systems are used for target detection tracking, boosting detection, tracking efficiency is the most important challenge in real-time reverberation. To eliminate reverberation when transmitting linear frequency modulated (LFM) signals, this study employs time series techniques such as autoregressive (AR), moving average (MA), (ARMA). The primary purpose of...