Room acoustic response modeling and equalization with linear predictive coding and parametric filters
US8363853B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 2007 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | Aug 22, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for determining coefficients of a family of cascaded second order Infinite Impulse Response (IIR) parametric filters used for equalizing a room response. The method includes determining parameters of each IIR parametric filter from poles or roots of a reasonably high-order Linear Predictive Coding (LPC) model. The LPC model is able to accurately model the low-frequency room response modes providing better equalization of loudspeaker and room acoustics, particularly at the low frequencies. Advantages of the method include fast and efficient computation of the LPC model using a Levinson-Durbin recursion to solve the normal equations that arise from the least squares formulation. Due to possible band interactions between the cascaded IIR parametric filters, the method further includes optimizing the Q value of each filter to better equalize the room response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.