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arXiv 2009.11029physics.app-phphysics.flu-dyn
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确定性声波在具有时变和量化材料特性的线性声学层中对随机噪声的色散

Dispersion of deterministic sound wave into stochastic noise by a linear acoustic layer with time-varying and quantized material properties

Yumin Zhang, Keming Wu, Chunqi Wang, Lixi Huang

摘要:

波对于从世界中获取信息至关重要,它与物质的相互作用由波长或频率决定。对移频能力的研究往往指向材料的非线性,这只有在激励水平非常高时才有意义。时间调制材料被期望以线性方式移动声音频率,但由于调制比不足,迄今为止还没有有效地实现。本文介绍了一种新型的具有巨大调制比的时间调制材料。当以随机时间序列给出调制时,单色声波被转换为连续频带的白噪声。演示的设备被称为随机声学元层,由模拟电路分流的悬浮隔膜组成。该电路改变了声阻抗的层,工作在两个量子化状态时,分流器的连接和断开的MOSFET与伪随机的时间序列。该设备具有前所未有的潜在应用,例如将恼人的音调转换为白噪声般的嗡嗡声以改善心理声学质量,允许加密水下通信和超分辨率成像。

英文摘要:

Wave is crucial to acquiring information from the world and its interaction with matter is determined by the wavelength, or frequency. Search for the ability to shift frequency often points to material nonlinearity, which is significant only when the excitation level is very high. Temporal modulated material is expected to shift sound frequency in a linear manner, but is so far not effectively realized due to inadequate modulation ratio. This study introduces a new class of temporal modulation material with a giant modulation ratio. When the modulation is given in a random time sequence, a monochromatic sound wave is converted to a white noise of a continuous frequency band. The demonstrated device is called a randomized acoustic meta-layer, consisting of a suspended diaphragm shunted by an analog circuit. The circuit alters the acoustic impedance of the layer which operates in two quantized states when the shunt is connected and disconnected by a MOSFET with a pseudo-random time sequence. The device has unprecedented potential applications such as converting annoying tones to white-noise-like hum to improve psychoacoustic quality, allowing encrypted underwater communication, and super-resolution imaging.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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