Method and device for detecting a displacement and movement of a sound producing unit of a woofer
US8300872B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2009 |
| Grant date | Oct 30, 2012 |
| Priority date | — |
| Expiry date | May 5, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for adjusting a response of a loudspeaker system. The system includes a woofer installed in a housing. The woofer includes a woofer cone. A transmitter for transmitting an ultrasonic audio signal towards the woofer cone. A receiver for receiving the ultrasonic audio signal. A detection unit for determining the position of the woofer cone on the basis of a difference between the phase of the reflected ultrasonic audio signal with respect to the ultrasonic audio signal transmitted from the transmitter. A control unit for adjusting a spring constant of the membrane of the loudspeaker system on the basis of the determined position. A method for adjusting a response of a loudspeaker system, to a module to be used in the system. A computer program product including computer code for adjusting a response of the loudspeaker system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.