Gain phase equalization (GPEQ) filter and tuning methods for asymmetric transaural audio reproduction
US10075789B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2016 |
| Grant date | Sep 11, 2018 |
| Priority date | — |
| Expiry date | Oct 11, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S2400/01
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A GPEQ filter and tuning methods for asymmetric transaural audio reproduction on mobile consumer devices. The GPEQ filter includes an asymmetric FIR filter bank configured to normalize the magnitude responses of at least two audio speakers to a target response above a low frequency cross-over of the audio speakers as reproduced at the listener position and a symmetric IIR filter bank component configured to high pass filter above the low frequency cross-over and equalize the magnitude responses of the at least two audio speakers. In some embodiments the FIR filter bank is configured to normalize the group delay of the audio channels and in some embodiments the IIR filter bank includes an asymmetric IIR filter bank component configured to correct any residual asymmetry in the magnitude responses of the at least two audio speakers. Phase preservation may be accomplished using phase-balanced or phase-compensated IIR filter sections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.