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:
Oct. 23, 2012
Filed:
Aug. 27, 2007
Po-hsun Sung, Kaohsiung, TW;
Chun-hsun Chu, Tainan, TW;
Po-Hsun Sung, Kaohsiung, TW;
Chun-Hsun Chu, Tainan, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A noise reduction device include at east a cavity; a plurality of ducts noise reduction, at least one of the ducts being connected to the cavity for transmitting an acoustic signal including a noise signal into/out of the cavity; a noise reduction circuit, for receiving the acoustic signal including the noise signal and generating an electrical signal; a microphone for receiving the acoustic signal inside the cavity, converting the received acoustic signal into another electrical signal and transmitting the electrical signal to the noise reduction circuit; and a speaker for receiving the electrical signal generated by the noise reduction circuit, using the received electrical signal to generate an out of phase acoustic signal accordingly, and feeding the out of phase acoustic signal into the cavity to interfere with the noise signal inside the cavity. With the noise reduction circuit and cavity structure designed in the noise reduction device, the full range of noise is attenuated.