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US 2017/0257686 A1Published application
Loudspeaker controller
AssigneeNXP B.V.
InventorsTemujin Gautama, Alan OCinneide, Lutsen Ludgerus Albertus Hendrikus Dooper
Life of this patent
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Abstract
A loudspeaker controller (1) for controlling a loudspeaker (2), configured to determine time-varying impedance information of the loudspeaker (2) based on a loudspeaker voltage and a measure of a loudspeaker current and provide for control of the loudspeaker (2) in accordance with said time-varying impedance information.
Claims18
1-15. canceled
A loudspeaker controller for controlling a loudspeaker driven by an input signal, the loudspeaker controller comprising:
- an amplifier to amplify the input signal;
- a measurement signal generator configured to generate a measurement signal;
- a mixer arranged prior to the amplifier to introduce the measurement signal into the input signal, the loudspeaker controller configured to determine time-varying impedance information of the loudspeaker based on the loudspeaker voltage, and a measure of the loudspeaker current and provide for control of the loudspeaker in accordance with said time-varying impedance information, wherein the impedance of the loudspeaker varies with instantaneous displacement, wherein the controller compares the time-varying impedance information with predetermined bounds to determine the loudspeaker's relation to an excursion limit, and wherein the loudspeaker controller controls the input signal as a function of the time-varying impedance information.
A method of controlling an output of a loudspeaker comprising:
- inputting an input signal and a measurement signal into a mixer;
- amplifying the mixed signal and outputting the mixed signal to a loudspeaker;
- measuring a loudspeaker current, the loudspeaker having the mixed signal applied thereto;
- determining time-varying impedance information of the loudspeaker based on a loudspeaker voltage, and the measured loudspeaker current;
- providing for control of the loudspeaker in accordance with said time-varying impedance information, wherein the impedance of the loudspeaker varies with instantaneous displacement,
- comparing the time-varying impedance information with predetermined bounds to determine the loudspeaker's relation to an excursion limit;
- and
- controlling the input signal as a function of the time-varying impedance information.
5 more elements
Dependencies are inferred from the claim text.