A parametric array PMUT loudspeaker with high efficiency and wide flat bandwidth

Been, Kyounghun; Je, Yub; Lee, H.S.; Moon, Wonkyu

doi:10.1109/transducers.2015.7181371

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…However, the amplitude stabilization property could have a substantial impact for resonant micro/nano-actuators. For ultrasound transducers, the interaction with the environment (gas or liquids) drastically damps the acoustic pressure level 41 . Achieving large amplitudes is therefore essential, which is usually performed with arrays of transducers, and improving their resolution through synchronization could open new perspectives for airborne communication schemes.…”

Section: Discussionmentioning

confidence: 99%

Amplitude stabilization in a synchronized nonlinear nanomechanical oscillator

et al. 2022

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In contrast to the well-known phenomenon of frequency stabilization in a synchronized noisy nonlinear oscillator, little is known about its amplitude stability. In this paper, we investigate experimentally and theoretically the amplitude evolution and stability of a nonlinear nanomechanical self-sustained oscillator that is synchronized with an external harmonic drive. We show that the phase difference between the tones plays a critical role on the amplitude level, and we demonstrate that in the strongly nonlinear regime, its amplitude fluctuations are reduced considerably. These findings bring to light a new facet of the synchronization phenomenon, extending its range of applications beyond the field of clock-references and suggesting a new means to enhance oscillator amplitude stability.

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Section: Discussionmentioning

confidence: 99%

Amplitude stabilization in a synchronized nonlinear nanomechanical oscillator

et al. 2022

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“…Furthermore, utilizing the technology behind ultrasonic capacitance transducers, a radically new loudspeaker concept was developed (Medley et al, 2019), which resulted in the creation of an ultra-thin loudspeaker. In extension to above explained studies, a piezo based thin speaker array study was proposed as a novel structure (Been et al, 2015). This study proposes a speaker structure suitable for limited dimensions but not very applicable for high quantity commercial products.…”

Section: Introductionmentioning

confidence: 99%

“…Above mentioned novel speaker solutions are proposed to solve mechanical limit problems. On the other hand, novel structures of loudspeaker are not effective enough to solve performance problems, especially on low frequencies (Lee et al, 2010;Satoh et al, 1997;Hwang et al, 2005;Klippel, 2005a;2005b), and slim and rectangular shaped loudspeaker units have the problem of non-linearity and distortion (Bai et al, 2008;Been et al, 2015;. Distortion level of a speaker is critical for sound performance.…”

Section: Introductionmentioning

confidence: 99%

Archives of Acoustics

Demirel

2021

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In a television, obtaining a good acoustic response is a challenging issue because of slim mechanical structures. The area dedicated for speaker's placement is limited and inadequate space inside the cabinet of a TV prevents possible solutions to increase the sound performance. In addition, frame of the TV's is getting narrower as the customers searching for the highest screen to body ratio. These designing aspects restrain optimal speaker positioning to achieve good sound performance. In this paper, an analysis related to speaker's placement and mounting angle is proposed. A rotation setup compatible with a TV was prepared to measure different facing position of the speaker. This paper proposes the analysis of speaker's rotation and facing direction in a flat panel television and its effects on sound pressure level together with deviation of the acoustic response. Measurement results are analyzed with an audio analyzer together with a statistics tool to achieve precise results.

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