Constrained nonlinear parameter estimation for robust nonlinear loudspeaker modeling for the purpose of smart limiting
AssigneeHarman International Industries, Incorporated
InventorsDouglas J. BUTTON, Russell H. LAMBERT
Life of this patent
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Abstract
A non-linear excursion estimations system for estimating non-linear excursion of a loudspeaker may include a loudspeaker having a force transducer, and a controller programmed to limit excursion of the loudspeaker by modeling at least one constrained nonlinearity curve based on an asymptote outside of a safe operating area (SOA) nonlinearly curve of the loudspeaker.
Claims19
A non-linear excursion estimations system for estimating non-linear excursion of a loudspeaker, comprising:
- a loudspeaker having a transducer;
- and
- a controller programmed to:
- limit excursion of the loudspeaker by modeling at least one constrained nonlinearity curve based on an asymptote outside of a safe operating area (SOA) nonlinearity curve of the loudspeaker,
- establish a constraint based on a second asymptote arranged at a tail of the SOA nonlinearity curve, and
- generate the second asymptote based on a predetermined static force for achieving a maximum forcible displacement of a speaker cone, wherein the second asymptote includes an apex configured to align with the SOA nonlinearity curve.
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A non-linear excursion estimations system for estimating non-linear excursion of a loudspeaker, comprising:
- a loudspeaker having a transducer;
- a controller programmed to limit excursion of the loudspeaker by modeling a force factor constrained nonlinearity curve based on an asymptote arranged at a tail of a safe operating area (SOA) nonlinearity curve of the loudspeaker based on a predetermined static force for achieving a maximum forcible displacement of a speaker cone, wherein the second asymptote includes an apex configured to align with the SOA nonlinearity curve.
A method for estimating a non-linear excursion of a loudspeaker, comprising:
- determining a static force for achieving a maximum forcible displacement of a speaker cone;
- determining a safe operating area (SOA) nonlinearity curve of the loudspeaker;
- generating an asymptote based on the static force, wherein the asymptote includes an apex configured to align with the SOA nonlinearity curve;
- generating a target stiffness function based on the SOA nonlinearity curve and a constraint established by the asymptote;
- and
- curve fitting the target stiffness function to generate a stiffness function.
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Dependencies are inferred from the claim text.