{"title":"A parametric array PMUT loudspeaker with high efficiency and wide flat bandwidth","authors":"K. Been, Y. Je, H. S. Lee, W. Moon","doi":"10.1109/TRANSDUCERS.2015.7181371","DOIUrl":null,"url":null,"abstract":"A previous study demonstrated that a piezoelectric micromachined ultrasonic transducer (PMUT) could be used to construct a PA loudspeaker, and developed a prototype. In this paper, we describe the performance of a PA loudspeaker fabricated using a more developed package. Our PA loudspeaker consists of an array of PMUTs with two resonance frequencies and uses an `out-of-phase' driving technique, resulting in high power efficiency (up to 71%) and a wide flat radiation bandwidth. We also describe the characteristics of the PA sound, which depend on the method used to modulate the audible signal.","PeriodicalId":6465,"journal":{"name":"2015 Transducers - 2015 18th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS)","volume":"33 1","pages":"2097-2100"},"PeriodicalIF":0.0000,"publicationDate":"2015-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2015 Transducers - 2015 18th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/TRANSDUCERS.2015.7181371","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
Abstract
A previous study demonstrated that a piezoelectric micromachined ultrasonic transducer (PMUT) could be used to construct a PA loudspeaker, and developed a prototype. In this paper, we describe the performance of a PA loudspeaker fabricated using a more developed package. Our PA loudspeaker consists of an array of PMUTs with two resonance frequencies and uses an `out-of-phase' driving technique, resulting in high power efficiency (up to 71%) and a wide flat radiation bandwidth. We also describe the characteristics of the PA sound, which depend on the method used to modulate the audible signal.
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