Apparatus for actively reducing noise for interior of enclosed space
US5337365A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 27, 1992 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Aug 27, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/503
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An apparatus for reducing noise for an interior of enclosed space, e.g., a vehicular compartment using an FIR adaptive digital filter is disclosed in which a control circuit is provided which outputs drive signals to a plurality of loud speakers which generate control sounds to interfer with a noise sound propagated in the interior so that a performance function including terms of residual noise signals output from residual noise signal detecting microphones and drive signals to the loud speakers is minimized and contributivity of the drive signals to the performance function is changed according to an occurrence of divergence in the noise reducing apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.