A design of audio spot based on separating emission of the carrier and sideband waves
A design of audio spot based on separating emission of the carrier and sideband waves
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基于载波和边带波分离发射的音频点设计
DOI：
10.1121/1.4805470
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发表时间：
2013
影响因子：
2.4
通讯作者：
T. Nishiura
中科院分区：
文献类型：
--
作者：
T. Matsui;Daisuke Ikefuji;M. Nakayama;T. Nishiura
研制了一种利用超声波的非线性相互作用来实现音频点播的参数扬声器。参数扬声器具有更锐利的方向性，但发出的声音的反射和截获成为严重的问题。这是因为反射和拦截会导致对隐私的侵犯，并成为除目标听众之外的其他听众的噪音。参数扬声器的原理可以表述为空气中发射的超声波中载波和边带波的非线性相互作用。这表明我们可以通过分别发射载波和边带波来设计音频点。因此，在本文中，我们提出了载波和边带分离发射的音频点的设计方法。更具体地说，在从每个参数扬声器单独发射的载波和边带波重叠的区域解调可听声音。我们进行了评价实验，以测量声压级(SPL)的解调器。
Parametric loudspeaker, which utilizes an ultrasonic of non-linear interaction, is developed to achieve audio spot. The parametric loudspeaker has sharper directivity, but reflections and intercepts by emitted sounds become severe problems. This is because reflections and intercepts lead to an invasion of privacy, and become noise to other listeners except a target listener. Principle of the parametric loudspeaker can formulate as non-linear interaction of carrier and sideband waves in emitted ultrasonic sounds on air. This suggests that we can design audio spot by individually emitting the carrier and sideband waves. In the present paper, therefore, we propose the design method of audio spot with the separating emission of the carrier and sideband waves. More specifically, the audible sound is demodulated at an area where the carrier and sideband waves individually emitted from each parametric loudspeaker are overlapped. We carried out evaluation experiments to measure sound pressure level (SPL) of demod...