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TECHNICAL NOTE
ON PREPROCESSING TECHNIQUES FOR BANDLIMITED PARAMETRIC LOUDSPEAKERS
Ee-Leng Tan, Peifeng Ji, Woon-Seng Gan
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SOURCE
Applied Acoustics > 2010 > 71 > 5 > 486-492
ABSTRACT
The self-demodulation property of finite-amplitude ultrasonic waves can be
applied with parametric loudspeaker to produce audible sound. A special
characteristic of the reproduced sound waves using parametric loudspeaker is its
high directivity. However, the demodulated signal from parametric loudspeaker
suffers from high distortion. To reduce the distortion in the demodulated
signal, preprocessing of the modulating signal is usually employed. To determine
the effectiveness of the preprocessing technique, an important practical
constraint on the bandwidth of the ultrasonic transducer of the parametric
loudspeaker should be accounted. In this paper, we shall discuss a class of
preprocessing techniques that is based on quadrature amplitude modulation. As
compared to the conventional preprocessing methods used with bandlimited
ultrasonic transducer, the demodulated signal from our proposed preprocessing
techniques exhibits lower distortion.
IDENTIFIERS
journal ISSN : 0003-682X DOI 10.1016/j.apacoust.2009.11.006
AUTHORS
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EE-LENG TAN
PEIFENG JI
WOON-SENG GAN
KEYWORDS
Parametric loudspeaker Self-demodulation Preprocessing techniques
Parametric loudspeaker Self-demodulation Preprocessing techniques
ADDITIONAL INFORMATION
Publication languages: English
Data set: Elsevier
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Elsevier Science
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