Phase equalization for multi-channel loudspeaker-room responses
First Claim
1. A method in a signal processor 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:
- providing 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;
adapting the coefficients of the all-pass filter 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.
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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, a[1d 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.
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Citations
10 Claims
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1. A method in a signal processor 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:
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providing 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; adapting the coefficients of the all-pass filter 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)
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4. A method for minimizing the spectral deviations in the cross-over region of a combined subwoofer and satellite speaker response, the method comprising:
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providing 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.
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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:
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providing 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.
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6. A signal processor configured to minimize the spectral deviations in the cross-over region of a combined bass-managed subwoofer-room and bass-managed satellite-room response, the configuration comprising a sub-configuration to:
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provide 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; adapting the coefficients of the all-pass filter 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 (7, 8)
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9. A signal processor configured to minimize the spectral deviations in the cross-over region of a combined subwoofer and satellite speaker response, the configuration comprising a sub-configuration to:
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providing a structure for at least one all-pass filter to reduce incoherent addition of acoustic signals produced by the subwoofer and the satellite speaker; define a phase response error for a combined subwoofer, all-pass filter, and satellite response; obtain coefficients for the all-pass filter by minimizing the phase response error; and
process a speaker channel with the all-pass filter.
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10. A signal processor configured to minimize the spectral deviations in the cross-over region of a combined bass-managed subwoofer-room and bass-managed satellite-room response, the configuration comprising a sub-configuration to:
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provide 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 compute all-pass filter coeffients to mimimize 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 cascade the all-pass filter with at least one of the satellite speaker bass-management filter and subwoofer bass-management filter.
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Specification