Creating digital signal processing (DSP) filters to improve loudspeaker transient response
First Claim
1. A method of creating a digital signal processing (DSP) filter to improve the transient response of a loudspeaker, wherein the loudspeaker is formed of multiple components, the method comprising:
- identifying a substantially linear, time-invariant, and spatially-consistent loudspeaker mechanism causing transient response distortion;
characterizing the identified mechanism;
determining the characterized mechanism'"'"'s two-port response;
establishing a target response for the characterized mechanism;
calculating an ideal filter to achieve the target response; and
designing a cost-reduced filter based on the ideal filter to thereby form a loudspeaker mechanism algorithm (LMA) filter.
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Abstract
A method is provided for creating a series of digital signal processing (DSP) filters to improve the transient response of a loudspeaker, wherein the loudspeaker is formed of multiple components. The method includes generally six steps. The first step involves identifying a substantially linear, time-invariant, and spatially-consistent loudspeaker mechanism causing transient response distortion. The second step involves characterizing the identified mechanism. The third step involves determining the characterized mechanism'"'"'s two-port response. The fourth step involves establishing a target response for the characterized mechanism. The fifth step involves calculating an ideal filter to achieve the target response. The sixth step involves designing a cost-reduced filter based on the ideal filter.
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Citations
18 Claims
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1. A method of creating a digital signal processing (DSP) filter to improve the transient response of a loudspeaker, wherein the loudspeaker is formed of multiple components, the method comprising:
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identifying a substantially linear, time-invariant, and spatially-consistent loudspeaker mechanism causing transient response distortion;
characterizing the identified mechanism;
determining the characterized mechanism'"'"'s two-port response;
establishing a target response for the characterized mechanism;
calculating an ideal filter to achieve the target response; and
designing a cost-reduced filter based on the ideal filter to thereby form a loudspeaker mechanism algorithm (LMA) filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of creating a series of digital signal processing (DSP) filters to improve the transient response of a loudspeaker, wherein the loudspeaker is formed of multiple components, the method comprising:
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(a) for each component;
(1) identifying a substantially linear, time-invariant, and spatially-consistent loudspeaker mechanism;
(2) characterizing the identified mechanism;
(3) determining the characterized mechanism'"'"'s two-port response;
(4) establishing a target response for the characterized mechanism;
(5) calculating an ideal filter to achieve the target response; and
(6) designing a cost-reduced filter based on the ideal filter to thereby form a loudspeaker mechanism algorithm (LMA) filter; and
(b) for all components;
(7) applying minimum phase filters to equalize multiple frequency ranges;
(8) applying linear phase crossover filters; and
(9) repeating any of the steps (1)-(8) above to achieve a combined loudspeaker response that exhibits reproduction accuracy. - View Dependent Claims (10, 11, 12)
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- 13. A loudspeaker system comprising multiple components and a series of digital signal processing (DSP) filters created to improve the loudspeaker'"'"'s transient response, wherein the DSP filters comprise loudspeaker mechanism algorithm (LMA) filters that are each configured to correct a substantially linear, time-invariant, and spatially-consistent loudspeaker mechanism causing transient response distortion.
Specification