The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 27, 2021
Filed:
Dec. 31, 2019
The Hong Kong University of Science and Technology, Hong Kong, CN;
Hong Kong Baptist University, Hong Kong, CN;
Ping Sheng, Hong Kong, CN;
Zhen Dong, Hong Kong, CN;
Xiaonan Zhang, Hong Kong, CN;
Jie Pan, Hong Kong, CN;
Ho Yiu Mak, Hong Kong, CN;
Guancong Ma, Hong Kong, CN;
THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, Hong Kong, CN;
HONG KONG BAPTIST UNIVERSITY, Hong Kong, CN;
Abstract
An active sound barrier has at least one passive sound absorber at or near a boundary location. A microphone provides an output to a frequency division module, in which a plural of frequencies are filtered to provide outputs corresponding to frequency segments of the receiving transducer output at respective ones of the frequencies. An active driving circuit drives plural speakers or output transducers at respective ones of the frequencies, with at least a subset of the speakers or output transducers at or close to the barrier. The speakers or output transducers cooperate with the passive sound absorber to reduce noise across a wide frequency band as well as to effect an electrically switchable soft boundary.