This paper describes our current work to create the apparatus and methodology for scientific and repeatable collection of firearm acoustical properties, including the important direction-dependence of each firearm’s sound field. Gunshot acoustical data is collected for a wide range of firearms using an elevated shooting platform and an elevated spatial array of microphones to allow echo-free di...

A subjective survey on perceived environmental quality has been carried out on 51 secondary-school classrooms, some of which have been acoustically renovated, and acoustical measurements were carried out in eight of the 51 classrooms, these eight being representative of the different types of classrooms that are the subject of the survey. A questionnaire, which included items on overall quality...

This article addresses the underwater acoustical localization problem by using time-difference-of-arrival (TDOA) and bearing-angle-of-arrival (BAOA) measurements. For acoustic equipment, such as ultrashort baseline system (USBL), whose bearing measurements are different from traditional angle-of-arrival (AOA) model, a closed-form solution for hybrid TDOA/BAOA-based source is developed. However,...

This report describes a method of speech modification to improve the intelligibility of speech. The spectral energy is reallocated by maintaining and emphasizing acoustical features important for speech perception. The method consists of three components: flattening of the spectral tilt, enhancement of the spectral contrast, and holding of the low-frequency region. The results of this speech in...

The paper outlines a mixture distribution of Gaussian method for estimation the probability density function. A RBF neural network architecture for realising such estimation is proposed. Moreover, the learning algorithm is derived. The practical use of the method is illustrated by a small example of an recognition application. The aim of which is to recognise vehicles based on the acoustical si...