Noise reduction device and method thereof
US8295503B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2007 |
| Grant date | Oct 23, 2012 |
| Priority date | — |
| Expiry date | Mar 1, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/1083
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.