Studies on sound field control methods able to create independent listening zones in a single acoustic space have recently been undertaken due to the potential of such methods for various practical applications, such as individual audio streams in home entertainment. Existing solutions to the problem have shown to be effective in creating high and low sound energy regions under anechoic conditi...

Compared with the study on acoustic quality of western music and opera, few studies were carried out on how the contemporary people evaluate acoustic attributes of Chinese traditional opera. In this study the subjective preference values of acoustic parameters for Peking opera such as sound pressure level, reverberation time and frequency response curve of RT were revealed through laboratory ex...

Existing techniques in correlation spectroscopy, such as coda wave interferometry and diffusing acoustic wave spectroscopy, determine the average motion of scatterers or change in the propagation velocity from the temporal change of multiply scattered sound. However, neither of them gives an indication of the spatial extent of the change in the medium. This study is an extension of the techniqu...

the quality of the communication between teachers and students and ultimately, of classroom education itself, is closely linked to the acoustic quality of the auditorium. this acoustic quality can be characterized based on the reverberation time (rt), speech transmission index (sti) and the sound insulation. in this context, an acoustic study was conducted in an auditorium located in the higher...

Sound waves are mechanical waves and the behaviours of fixtures inside rooms are governed by rules in physics. These fixtures are classified into three groups: reflectors, diffusers and absorbers, and the physical properties are investigated. The important parameters in determining acoustic quality of rooms are introduced. On the other hand, it is shown that limitations exist on applying these ...

Using a local plane wave assumption, one can determine the normal incidence sound absorption coefficient of a surface by measuring the acoustic pressure and the particle velocity normal to that surface. As the measurement surface lies in front of the material surface, the measured active and incident acoustic power will generally deviate from those at the material surface, leading to a possibly...

Simultaneous structural-control optimization of a coupled structural-acoustic enclosure is investigated in this paper. The whole system has a rectangular parallelepiped sound field of which the entire bottom face and the partial top face are covered with two elastic plates while the other boundaries are enclosed with rigid walls. Two point forces applied on the two plates are used as disturbanc...