Sweeping echoes in two-dimensional reverberant space

Acoustical Science and Technology

Ken&rsquoichi Furuya¹  Kenji Kiyohara¹  Yutaka Kaneda² 

[1] NTT Cyber Space Laboratories;Tokyo Denki University

关键词: Sweeping sound;    Impulse response;    Number theory;    Regularly shaped space;    Echo;   

DOI  :  10.1250/ast.23.127

学科分类：声学和超声波

来源: Acoustical Society of Japan

【 摘 要 】

References(23)A very interesting acoustical phenomenon, which we call sweeping echoes in a two-dimensional (2D) space, is described and investigated. Sweeping echoes in a three-dimensional (3D) space have recently been reported. In this paper, the regularity of reflected sound in a 2D regularly shaped space is first investigated based on number theory. The reflected pulse sound train has almost equal intervals between pulses on the squared-time axis as in a 3D space. This regularity of arrival times of the reflected pulse sounds generates sweeping echoes whose frequency increases linearly with time. Computer simulation of room acoustics shows good agreement with the theoretical results. In a practical situation, sweeping echoes were observed in a long hallway having a square section.

【 授权许可】

Unknown