{"title":"Idle Noise Reduction of a Parametric Acoustic\nArray Power Driver","authors":"M. Pirc","doi":"10.33180/INFMIDEM2019.105","DOIUrl":null,"url":null,"abstract":"Parametric acoustic arrays (PAA) have progressed from specialized niche applications to commercially available audio\nsolutions in the last two decades. Their primary advantage is their incredible directivity and their main disadvantage is low conversion\nefficiency of the primary ultrasonic waves into audible sound. This paper presents a noise analysis of a practical implementation\nof a directional audio system. The system is comprised of a modulator, a D-class audio amplifier, and an emitter consisting of 97\ncommercially available piezoelectric ultrasonic transducers. The designed system exhibited an uncomfortable level of idle noise at the\nmaximum volume level. The analysis of the signal path and all the noise sources revealed that the most critical component was the\nmodulator, and a solution was devised which provided a 16 dB improvement of the carrier to noise ratio.","PeriodicalId":56293,"journal":{"name":"Informacije Midem-Journal of Microelectronics Electronic Components and Materials","volume":"72 1","pages":""},"PeriodicalIF":0.6000,"publicationDate":"2019-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Informacije Midem-Journal of Microelectronics Electronic Components and Materials","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.33180/INFMIDEM2019.105","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
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.
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.
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