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METHODS AND APPARATUS RELATED TO PROTECTION OF A SPEAKER

  • US 20140126730A1
  • Filed: 11/07/2013
  • Published: 05/08/2014
  • Est. Priority Date: 11/07/2012
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a temperature sensor configured to measure a calibration temperature of a speaker coil;

    a test signal generator configured to generate a first test signal through the speaker coil;

    a current detector configured to measure a calibration current at the calibration temperature of the speaker coil based on the first test signal through the speaker coil;

    an audio signal generator configured to generate an audio signal; and

    a controller configured to trigger sending of a second test signal from the test signal generator through the speaker coil in combination with the audio signal, the current detector configured to calculate a temperature change of the speaker coil during normal operation using a temperature relationship based on the calibration current at the calibration temperature and a temperature coefficient of the speaker coil.

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