Sound reproduction equipment and method for reducing the level of acoustical reflections in a room
US6795557B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2000 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Dec 6, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/505
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for attenuating acoustic reflections related to sound radiated by a loudspeaker in an acoustic space. According to the method, at least one cancelling loudspeaker is used for radiating a canceling sound in the space. The signal required for producing the cancelling sound is sampled from the sound reproduction apparatus prior to the processing of the original sound signal for emission into the acoustic space. The sample signal is low-pass filtered, delayed, amplified and inverted prior to being taken to the cancelling loudspeaker. The sound reproduction apparatus includes a signal sampling device, control devices, and at least one cancelling loudspeaker for radiating the cancelling sound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.