3-D sound field reproduction systems can provide listeners with a sense of presence. In this study, we have proposed the 3-D sound field localization system using parametric loudspeakers. This system can easily represent sound images on the wall by using parametric loudspeakers that have a high directivity. In contrast, it is difficult to reproduce reverberant environments such as a concert hal...

In the tele-conference, the speech recognition system is mainly affected by the reverberation and not affected by the noise. The model for receiving signals adopted by most time delay estimation methods are additive noise model, which are not suitable for the system. Thus this paper illustrates one HB weight time delay estimation method in the reverberation environment based on onset signals. T...

This paper explores the statistical properties of underwater reverberation present in active sonar systems. The interference to signal processing which results from reverberation can be extensive, and is particularly acute when the boundaries (surface, bottom) of the water column are nearby. Of particular interest are situations where there may be weak targets masked by reverberation dominating...

The concept of environmentally adaptive reverberation nulling using a time reversal mirror TRM recently has been described Song et al., J. Acoust. Soc. Am. 116, 762–768 2004 . In this paper, monostatic reverberation nulling is demonstrated experimentally at 850 and 3500 Hz using data from a shallow water experiment conducted off the west coast of Italy in April 2003. The active transmission of ...

This paper presents the results of an evaluation of acoustic comfort such as background noise and reverberation time in teaching rooms in Height National School of Civil Engineering, Algeria. Four teaching rooms are evaluated: conference room, two classroom and amphitheatre. The acoustic quality of the classrooms has been analyzed based on measurements of sound pressure level inside room and re...

Geometric acoustic modeling systems spatialize sounds according to reverberation paths from a sound source to a receiver to give an auditory impression of a virtual 3D environment. These systems are useful for concert hall design, teleconferencing, training and simulation, and interactive virtual environments. In many cases, such as in an interactive walkthrough program, the reverberation paths...

Time reversal operator (TRO) decompositions are performed in a model of an ocean wave guide containing a target and having different kinds of bottom. The objective is to study the effects of bottom reverberation and absorption by means of ultrasonic experiments. It is shown experimentally that the echo from a target can be separated from the bottom reverberation. Reverberation eigenvectors are ...

Spring reverberation is a sonically unique form of artificial reverberation, desirable as an effect distinct from that of more conventional reverberation. Recent work has introduced a parametric model of spring reverberation based on long chains of allpass filters. Such chains can be computationally expensive. In this paper, we propose a number of modifications to these structures, via the appl...