Active attenuation of nonlinear sound
US6005952A · kind A · utility
Inventor
Key dates
| Filing date | Apr 5, 1995 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Apr 5, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/3039
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
This invention regards a method and an arrangement for attenuating undesirable high amplitude output sound of an acoustic system 2 by injecting a canceling sound produced by a controller 10 and radiated by a loudspeaker 12. The controller 10 has a nonlinear transfer behavior between the control input 20 provided with the sensed input noise and the output 26 connected to the loudspeaker 12. The architecture of the nonlinear controller 10 is directly derived from an acoustic model describing the nonlinear sound propagation in the acoustic system 2. The control architecture can be implemented in a digital signal processor with a minimum of elements and improves the efficiency of the active attenuation so that the fundamental and the nonlinear distortions of the sound can be canceled and the output noise level is lower than by using a linear control system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.