Sound emitting and collecting apparatus
US8559647B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 2008 |
| Grant date | Oct 15, 2013 |
| Priority date | — |
| Expiry date | Apr 19, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R5/027
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sound emitting and collecting apparatus that can accomplish stable echo removal if the relative positions of a loudspeaker and a microphone change is provided. A control section 52 inputs information of an arm rotation angle from a sensor 54. The control section 52 reads the filter coefficient corresponding to the input rotation angle from memory 53 and sets the coefficient in an adaptive filter 412A. When the arm rotates, the installing position of a microphone is changed and an acoustic transmission system changes, but a preset (or in the installing environment, updated) filter coefficient is set, whereby stable echo removal can be accomplished.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.