A master thesis from Aalborg University
On Multiple Sound Zones for Wideband Signals
Author(s)
Term
4. term
Publication year
2014
Submitted on
2014-06-03
Pages
74 pages
Abstract
The concept of sound zones has recently gained much attention in the acoustics community. The idea of sound zones is to separate a space into multiple zones for which the audio content can be individually controlled. This is done by use of an array of loudspeakers. The most commonly studied objective is to play sound in one part of a space while simultaneously attempting to keep another part of the space quiet. There are several known methods for steering an array in order to obtain this result. An issue is that these methods typically assume the input to be sinu- soidal with fixed frequency. This is not a realis- tic assumption for common audio signals such as speech or music. The problem of creating sound zones for such signals has not been ex- tensively studied in the literature. In this the- sis we investigate some possibilities for creating sound zones for wideband signals of this type. To facilitate the investigation of sound zone meth- ods, a software framework for room simulation with the mirror image model has been devel- oped. Among the discussed methods are both methods which have previously been discussed in the literature and methods which have not. We show that the task of extending sound zone methods to wideband signals introduces compli- cations which are not seen for simple sinusoidal signals. We also discuss means of overcoming these complications. The main outcome of the presented investigations is a sound zone method which performs well for wideband signals.
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