Electronic noise attenuation method and apparatus for use in effecting such method
US5295192A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 6, 1992 |
| Grant date | Mar 15, 1994 |
| Priority date | — |
| Expiry date | Oct 6, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/3046
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A method for electrically attenuating a noise in an area for a sound wave to be propagatable in a three dimensional direction by making up a drive signal from the information on the noise and previously given filter coefficients by use of an adaptive digital filter and then generating an additional sound wave in accordance with the drive signal for cancellation of the noise. In the electric noise attenuation method, there are provided in a given region for noise attenuation, first and second error sensor groups for detecting an interference sound wave produced between the noise and additional sound wave, at a sampling time, a filter coefficient is calculated based on the information relating to the first error sensor group, at the next sampling time, another filter coefficient is calculated based on the information relating to the second error sensor group, and these operations are repeatedly executed sequentially for each error sensor to thereby update the filter coefficient of the adaptive digital filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.