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MULTI-CHANNEL AUDIO SYSTEM HAVING A SHARED CURRENT SENSE ELEMENT FOR ESTIMATING INDIVIDUAL SPEAKER IMPEDANCES USING TEST SIGNALS

  • US 20150296293A1
  • Filed: 04/14/2014
  • Published: 10/15/2015
  • Est. Priority Date: 04/14/2014
  • Status: Active Grant
First Claim
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1. A method for operating an audio system having a plurality of speaker drivers, comprising:

  • providing a plurality of audio channel test signals simultaneously to inputs of a plurality of audio amplifiers, respectively, while each of the audio amplifiers is driving its respective speaker driver;

    sensing current of a single power supply rail that is feeding power to each of the plurality of audio amplifiers, while each of the amplifiers is driving its respective speaker driver, to produce a sensed shared current;

    obtaining a measure of input voltage of each of the speaker drivers; and

    computing an estimate of electrical input impedance of each of the speaker drivers, using the sensed shared current and the measure of input voltage of said speaker driver.

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