Broadband noise attenuation using a variable locally reacting impedance

Zhao, Xueyuan; Liu, Gongmin; Zhao, Chuming; Grosh, Karl

doi:10.1121/1.4972274

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…Other potential applications of this technology include sensing and actuation for many biomedical applications such as cardiovascular and urologic diagnostic procedures, surgical procedures and monitoring of invasive treatments. Moreover, the multi-resonant characteristics could be taken advantage of for use as a microphone or hydrophone, or even a broadband sound silencer 59,60 .…”

Section: Discussionmentioning

confidence: 99%

Voltage readout from a piezoelectric intracochlear acoustic transducer implanted in a living guinea pig

Zhao

Knisely

Colesa

et al. 2019

Sci Rep

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The ability to measure the voltage readout from a sensor implanted inside the living cochlea enables continuous monitoring of intracochlear acoustic pressure locally, which could improve cochlear implants. We developed a piezoelectric intracochlear acoustic transducer (PIAT) designed to sense the acoustic pressure while fully implanted inside a living guinea pig cochlea. The PIAT, fabricated using micro-electro-mechanical systems (MEMS) techniques, consisted of an array of four piezoelectric cantilevers with varying lengths to enhance sensitivity across a wide frequency bandwidth. Prior to implantation, benchtop tests were conducted to characterize the device performance in air and in water. When implanted in the cochlea of an anesthetized guinea pig, the in vivo voltage response from the PIAT was measured in response to 80–95 dB sound pressure level 1–14 kHz sinusoidal acoustic excitation at the entrance of the guinea pig’s ear canal. All sensed signals were above the noise floor and unaffected by crosstalk from the cochlear microphonic or external electrical interference. These results demonstrate that external acoustic stimulus can be sensed via the piezoelectric voltage response of the implanted MEMS transducer inside the living cochlea, providing key steps towards developing intracochlear acoustic sensors to replace external or subcutaneous microphones for auditory prosthetics.

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Section: Discussionmentioning

confidence: 99%

Voltage readout from a piezoelectric intracochlear acoustic transducer implanted in a living guinea pig

Zhao

Knisely

Colesa

et al. 2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…The functionality detail expands to the artificial-composite crystal-media design (Kaina et al, 2015), the radiation pattern control (Quan et al, 2014), the acoustic superlensing fabrication (Fang et al, 2006), the acoustic cloaking (Cheng et al, 2015), and so on (Assouar et al, 2018; Jonsson et al, 2017). Their applications are mainly divided into two aspects of the noise elimination (Kumar et al, 2018; Wu et al, 2017; Xu et al, 2021; Zhao et al, 2017) and the wave amplification (Al Jahdali and Wu, 2018; Jonsson et al, 2017; Yuan et al, 2019). For the former, as an example of utilization, the specific array form of HR can exclusively eliminate the acoustic wave of Helmholtz resonant frequency (Cheng et al, 2015; Fang et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Theoretical model and dynamic wave-amplification effect of the high intensity Helmholtz sound source

Qiao

Cheng

Jin

2021

Journal of Vibration and Control

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Helmholtz sound source consists of Helmholtz resonator and speaker and belongs to a new type of high-intensity sound source. It has potential industrial advantage in the aerodynamic acoustic application for the large amplitude wave. Based on the lumped parameter principle of acoustic impedance, an acoustic theoretical model is suggested. The model reveals the amplification regulation of the sound source on the acoustic wave. Through the acoustic theoretical computation, a dynamic amplification and an amplification limitation are analyzed. The wave-amplification effect attributes to the parameter regulation of the macro, micro, and dynamic-varied sizes of the sound source. The repetitive motion of the vibrating membrane of speaker causes three working states of balance, squeeze, and stretch. The three states act as specific boundary conditions and demonstrate as three different theoretical curves. The theoretical boundary curves codetermine an experimental curve, which essentially limits the practical amplification effect. Nevertheless, the amplification gain of sound pressure amplitude reaches up to 1.8 times, and the potential maximum amplitude reaches up to 3600 Pa (164 dB). The two quantitative characteristics indicate the maximum capability of the sound source on wave-amplification effect. The control sensitivity of the complicated impedance parameters on wave amplification is 0.26 Pa/Hz. The acoustic theoretical model is valuable in the series aspects of the industrial design, manufacture, and application of the sound source. Especially, the theoretical innovation lays the foundation of solid to these aspects.

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Study on the Performance Improvement Mechanisms of Expansion Chamber Water Mufflers with Reacting End Walls

Sun

Wang

et al. 2023

Acoust Aust

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Broadband noise attenuation using a variable locally reacting impedance

Cited by 6 publications

References 34 publications

Voltage readout from a piezoelectric intracochlear acoustic transducer implanted in a living guinea pig

Voltage readout from a piezoelectric intracochlear acoustic transducer implanted in a living guinea pig

Theoretical model and dynamic wave-amplification effect of the high intensity Helmholtz sound source

Study on the Performance Improvement Mechanisms of Expansion Chamber Water Mufflers with Reacting End Walls

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