Idle Noise Reduction of a Parametric Acoustic Array Power Driver

IF 0.6 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Informacije Midem-Journal of Microelectronics Electronic Components and Materials Pub Date : 2019-05-07 DOI:10.33180/INFMIDEM2019.105

M. Pirc

引用次数: 0

Abstract

Parametric acoustic arrays (PAA) have progressed from specialized niche applications to commercially available audio solutions in the last two decades. Their primary advantage is their incredible directivity and their main disadvantage is low conversion efficiency of the primary ultrasonic waves into audible sound. This paper presents a noise analysis of a practical implementation of a directional audio system. The system is comprised of a modulator, a D-class audio amplifier, and an emitter consisting of 97 commercially available piezoelectric ultrasonic transducers. The designed system exhibited an uncomfortable level of idle noise at the maximum volume level. The analysis of the signal path and all the noise sources revealed that the most critical component was the modulator, and a solution was devised which provided a 16 dB improvement of the carrier to noise ratio.

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参数声学阵列电源驱动器的空闲噪声降低

在过去的二十年里，参数声学阵列(PAA)已经从专门的小众应用发展到商业化的音频解决方案。它们的主要优点是它们令人难以置信的指向性，它们的主要缺点是初级超声波转化为可听声音的效率低。本文对一个定向音频系统的实际实现进行了噪声分析。该系统由一个调制器、一个d级音频放大器和一个由97个市售压电超声换能器组成的发射器组成。所设计的系统在最大音量水平下显示出令人不舒服的空闲噪声水平。通过对信号路径和所有噪声源的分析，发现调制器是最关键的部件，并设计了一种解决方案，使载波噪声比提高了16 dB。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Informacije Midem-Journal of Microelectronics Electronic Components and Materials 工程技术-材料科学：综合

CiteScore

1.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Informacije MIDEM publishes original research papers in the fields of microelectronics, electronic components and materials. Review papers are published upon invitation only. Scientific novelty and potential interest for a wider spectrum of readers is desired. Authors are encouraged to provide as much detail as possible for others to be able to replicate their results. Therefore, there is no page limit, provided that the text is concise and comprehensive, and any data that does not fit within a classical manuscript can be added as supplementary material. Topics of interest include: Microelectronics, Semiconductor devices, Nanotechnology, Electronic circuits and devices, Electronic sensors and actuators, Microelectromechanical systems (MEMS), Medical electronics, Bioelectronics, Power electronics, Embedded system electronics, System control electronics, Signal processing, Microwave and millimetre-wave techniques, Wireless and optical communications, Antenna technology, Optoelectronics, Photovoltaics, Ceramic materials for electronic devices, Thick and thin film materials for electronic devices.