Abstract
Personal sound zones (PSZ) systems use an array of loudspeakers to render independent audio signals to multiple listeners within a room. The performance of a PSZ system, designed using weighted pressure matching, depends on the selected target responses for the bright zone. In reverberant environments, the target responses are generally chosen to be the room impulse responses from one of the loudspeakers to the control points in the selected bright zone. This approach synthesizes the direct propagation component and all the reverberant components in the bright zone, while minimizing the energy in the dark zone. We present a theoretical analysis to show that high energy differences cannot be achieved for the diffuse reverberant components in the bright and dark zones, and so trying to synthesize these components in the bright zone does not lead to the best performance. It is then shown that the performance can be improved by using windowed versions of these measured impulse responses as target signals, in order to control which reverberant components are synthesized in the bright zone and which are not. This observation is supported by experimental measurements in two scenarios with different levels of reverberation.
Highlights
Subband-domain[15] and frequency-domain.[16]
We present a theoretical analysis to show that high energy differences cannot be achieved for the diffuse reverberant components in the bright and dark zones, and so trying to synthesize these components in the bright zone does not lead to the best performance
The target response selected for the bright zone is a key choice for WPM systems, as different targets responses can lead to different levels of energy in the dark zone
Summary
Subband-domain[15] and frequency-domain.[16]. In this paper, because of its simplicity, we will use the frequency-domain formulation. The target response selected for the bright zone is a key choice for WPM systems, as different targets responses can lead to different levels of energy in the dark zone. This is an aspect that, to the best of our knowledge, has not been previously studied in the literature. We propose a variation of the WPM approach, in which a window function is applied to the target impulse response for the bright zone By windowing this response, we can control which reverberant components are synthesized and which are minimized in the bright zone.
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