文章基本信息

标题：Unidirectional Speaker to Eliminate Noise Pollution
本地全文：下载
作者：Abhishek Rathod ; Madhu Lagishetty ; Nishant Kurade 等
期刊名称：International Journal of Advances in Engineering and Management
电子版ISSN：2395-5252
出版年度：2021
卷号：3
期号：5
页码：1058-1060
DOI：10.35629/5252-0305930934
语种：English
出版社：IJAEM JOURNAL
摘要：A loudspeaker that people only hear when directly in front of it. Used for marketing or instructional purposes when someone walks by, parametric speakers use ultrasonic frequencies, which are extremely directional but are beyond human hearing. Whereas a typical loudspeaker pushes air, parametric speakers generate an audible signal by modulating the air outside of the speaker cabinet, which confines itself to the narrow geography of the ultrasonic beam. The higher the ultrasonic frequencies used, the narrower the beam. Uses in Public Safety, Commercial Advertising, Security Alarm Systems.