Adjusting a loudspeaker to its acoustic environment: the ABC system
US6731760B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 29, 2002 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Oct 19, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R29/001
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and corresponding apparatus for controlling the performance of a loudspeaker in a room includes the steps of, in a first acoustic environment, which may be regarded as a reference, determining the acceleration, velocity or displacement of the loudspeaker diaphragm and the sound pressure in front of the diaphragm, and, based on these quantities, determining the radiation resistance, radiated acoustic power or real part of the acoustic wave impedance. Thereafter, the above step is repeated in a second acoustic environment, which will normally be the actual listening room in which the loudspeaker is to be used. Based on the above measurements, the ratio between the radiation resistances, radiated power or real part of the acoustic wave impedances is determined, and the ratio, optionally after suitable further processing, is used to control a controllable correction filter inserted in the signal path of the loudspeaker, whereby the performance of the loudspeaker in the second acoustic environment can be brought substantially to match the performance of the loudspeaker in the first acoustic environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.