Phase equalization for multi-channel loudspeaker-room responses
First Claim
1. A method for minimizing the spectral deviations in the cross-over region of a combined bass-managed subwoofer-room and bass-managed satellite-room response, the method comprising:
- defining at least one second order all-pass filter having coefficients to reduce incoherent addition of acoustic signals produced by the subwoofer and the satellite speaker, the all-pass filter being in cascade with at least one of the satellite speaker filter and subwoofer bass-management filter;
wherein the coefficients of the all-pass filter are adapted by minimizing a phase response error, the error being a function of phase responses of the subwoofer-room response, the satellite-room response, and the subwoofer and satellite bass-management filter responses.
4 Assignments
0 Petitions
Accused Products
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.
47 Citations
10 Claims
-
1. A method for minimizing the spectral deviations in the cross-over region of a combined bass-managed subwoofer-room and bass-managed satellite-room response, the method comprising:
-
defining at least one second order all-pass filter having coefficients to reduce incoherent addition of acoustic signals produced by the subwoofer and the satellite speaker, the all-pass filter being in cascade with at least one of the satellite speaker filter and subwoofer bass-management filter;
wherein the coefficients of the all-pass filter are adapted by minimizing a phase response error, the error being a function of phase responses of the subwoofer-room response, the satellite-room response, and the subwoofer and satellite bass-management filter responses. - View Dependent Claims (2, 3)
-
-
4. A method for minimizing the spectral deviations in the cross-over region of a combined subwoofer and satellite speaker response, the method comprising:
-
defining a structure for at least one all-pass filter to reduce incoherent addition of acoustic signals produced by the subwoofer and the satellite speaker;
defining a phase response error for a combined subwoofer, all-pass filter, and satellite response;
obtaining coefficients for the all-pass filter by minimizing the phase response error; and
processing a speaker channel with the all-pass filter.
-
-
5. A method for minimizing the spectral deviations in the cross-over region of a combined bass-managed subwoofer-room and bass-managed satellite-room response, the method comprising:
-
defining at least one second order all-pass filter having all-pass filter coefficients selectable to reduce incoherent addition of acoustic signals produced by the subwoofer and the satellite speaker;
recursively computing the all-pass filter coefficients to minimize a phase response error, the phase response error being a function of phase responses of a subwoofer-room response, a satellite-room response, and the subwoofer and satellite bass-management filter responses; and
cascading the all-pass filter with at least one of the satellite speaker bass-management filter and subwoofer bass-management filter. - View Dependent Claims (6, 7, 8, 9, 10)
-
Specification