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Speaker diagnostics based upon driving-point impedance

  • US 7,106,865 B2
  • Filed: 12/15/2004
  • Issued: 09/12/2006
  • Est. Priority Date: 12/15/2004
  • Status: Expired due to Fees
First Claim
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1. A method of ascertaining a condition of a speaker contained in an audio device, the method comprising:

  • supplying a test signal to a voice coil that drives the speaker;

    determining a driving-point impedance from the voice coil based upon the test signal; and

    comparing the driving-point impedance to a predetermined impedance to thereby ascertain the condition of the speaker based upon the comparison.

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