Flowmeter measurement using the ultrasonic transit-time method is based on the apparent difference of the sound velocity in the flow direction and in the opposite direction. This method gives a flow velocity averaged along a particular acoustical path. To convert this path velocity to a velocity averaged over the entire cross-section of the flowing medium, the knowledge of the flow velocity pro...

Numerous examinations are performed related to automatic emotion recognition and speech detection in the Laboratory of Speech Acoustics. This article reviews results achieved for automatic emotion recognition experiments on spontaneous speech databases on the base of the acoustical information only. Different acoustic parameters were compared for the acoustical preprocessing, and Support Vector...

In this paper, a novel multi-speaker segmentation technique is presented. This technique makes use of wavelets and support vector machines (SVMs) to segment specific speakers’ speech signals from multi-dialog environments. The proposed method first applies wavelets to determine the acoustical features such as subband power and pitch information from a given multi-dialog speech data. Then the mu...

The simulation of an auditory environment is audio signal processing depending on an acoustical model method and a given scene model. For signal processing we use a set of signal processing objects which can be glued to a signal processing network. The object structure depends on the requested acoustic model method in consideration of real-time aspects of an interactive virtual reality (VR). Th...

Room impulse responses can be analysed to yield several room acoustical parameters, such as reverberation time, early decay time, clarity index and strength factor. Despite the considerable noise immunity of modern impulse response measurement techniques (such as swept sinusoids), it is common for room impulse responses to have sufficient noise to have some effect on the derived room acoustical...

A method is proposed for modeling a room transfer function (RTF) by using common acoustical poles and their residues. The common acoustical poles correspond to the resonance frequencies (eigenfrequencies) of the room, so they are independent of the source and receiver positions. The residues correspond to the eigenfunctions of the room. Therefore, the residue, which is a function of the source ...

This paper presents a reduced-order approach to near-field acoustical holography (NAH) that allows the user to account for sound fields generated by multiple spatially separated sources. In this method, an equivalent wave model (EWM) of a given field is formulated to include combinations of planar, cylindrical, spherical, or other elementary wave functions in contrast to an EWM restricted to a ...

Underwater acoustic localization (UWAL) is extremely challenging due to the multipath nature of extreme underwater environments, sensor position uncertainty caused by unpredictable ocean currents, and lack observation data sparse array, which all affect performance. Addressing these issues, this paper proposes a simple effective method using time difference arrival (TDOA) measurements based on ...

An advanced configuration 1-3 piezocomposite, designated by its manufacturer as SonoPanel(TM), has been investigated for potential underwater acoustical applications. In-air electromechanical characteristics and in-water acoustical properties of the SonoPanel(TM) were experimentally examined. The in-air impedance measurement results showed the existence of parasitic modes in the composite panel...