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Title: An overview of directivity control methods of the parametric array loudspeaker
Authors: Shi, Chuang
Kajikawa, Yoshinobu
Gan, Woon-Seng
Keywords: Acoustic beamforming
Directivity model
Parametric array loudspeaker
Issue Date: 2014
Source: Shi, C., Kajikawa, Y., & Gan, W.-S. An overview of directivity control methods of the parametric array loudspeaker. APSIPA Transactions on Signal and Information Processing, 3, e20-.
Series/Report no.: APSIPA Transactions on Signal and Information Processing
Abstract: A sound reproduction system usually consists of several types of loudspeakers to cater to sophisticated applications. The directivity of a loudspeaker is a measure of its efficiency in sending sounds to a particular direction instead of all directions. Demand to control the directivity of a sound reproduction system is gaining momentum with many new designs of directional loudspeakers, including the acoustic dome, horn loudspeaker, loudspeaker array, and parametric array loudspeaker (PAL). The PAL is an application of the parametric acoustic array in air, which generates a sound beam from the interaction of ultrasonic beams. The PAL has several desired features, such as its narrow beamwidth over a wide frequency range, low sound attenuation over a long distance, and ability to reproduce perceptually near sound images. The PAL is also advantageous in using a smaller driving unit to transmit an equally narrow sound beam as compared to the conventional loudspeaker and broadside loudspeaker array. An overview of directivity control methods of the PAL is presented in this paper. In particular, acoustic models and signal processing techniques in controlling the directivity of the PAL are emphasized.
ISSN: 2048-7703
DOI: 10.1017/ATSIP.2014.18
Schools: School of Electrical and Electronic Engineering 
Rights: © 2015 The Authors. The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike license <>. The written permission of Cambridge University Press must be obtained for commercial re-use.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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