Phase equalization for multi-channel loudspeaker-room responses
US7720237B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2005 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Mar 18, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S3/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method for minimizing the complex phase interaction between non-coincident subwoofer and satellite speakers for improved magnitude response control in a cross-over region. An all-pass filter is cascaded with bass-management filters in at least one filter channel, and preferably all-pass filters are cascaded in each satellite speaker channel. Pole angles and magnitudes for the all-pass filters are recursively calculated to minimize phase incoherence. A step of selecting an optimal cross-over frequency may be performed in conjunction with the all-pass filtering, and is preferably used to select an optimal cross-over frequency prior to determining all-pass filter coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.