System and method for determining voice coil offset or temperature
AssigneeBose Corporation
InventorRandy Michael Carbo
Life of this patent
Estimating the term…
Abstract
A method for determining a displacement offset of a voice coil of a speaker, comprising: providing a drive signal comprised of a program content signal and a test signal to the voice coil of the speaker; determining at least one value representative of an impedance of the voice coil according to a voice coil voltage and a voice coil current, wherein the voice coil voltage and the voice coil current result from, at least, the test signal; determining whether the at least one value indicates that an offset displacement of the voice coil exceeds a predetermined offset distance; and reducing a magnitude of the drive signal provided to the voice coil if the at least one value indicates that the offset displacement of the voice coil exceeds the predetermined offset threshold.
Claims20
A method for determining a displacement offset of a voice coil of a speaker, comprising:
- providing a drive signal comprised of a program content signal and a test signal to the voice coil of the speaker;
- determining at least one value representative of a relationship between a voice coil voltage and a voice coil current, wherein the voice coil voltage and the voice coil current result from, at least, the test signal;
- determining whether the at least one value indicates that an offset displacement of the voice coil exceeds a predetermined offset distance;
- and
- reducing a magnitude of the drive signal provided to the voice coil if the at least one value indicates that the offset displacement of the voice coil exceeds the predetermined offset distance.
A non-transitory storage medium storing program code that, when executed by a processor, performs a method comprising the steps of:
- determining at least one value representative of a relationship between a voice coil voltage and a voice coil current, wherein the voice coil voltage and the voice coil current result from, at least, a test signal applied to a voice coil of a speaker;
- determining whether the at least one value indicates that an offset displacement of the voice coil exceeds a predetermined offset distance;
- and
- reducing a magnitude of a drive signal provided to the voice coil if the at least one value indicates that the offset displacement of the voice coil exceeds the predetermined offset distance, wherein the drive signal includes the test signal.
Dependencies are inferred from the claim text.