| 摘要 |
A speaker ( 100 ) having a diagnostic capability, as well as a circuit ( 101 ) and related methods ( 500 ) for performing speaker diagnostics based upon a driving-point impedance are provided. The speaker includes a flexible cone ( 104 ) and a voice coil ( 106 ) connected to the flexible cone for driving the flexible cone so as to convert electrical signals into sound. The speaker also includes a signal source ( 110 ) connected to the voice coil for supplying a test signal to the voice coil. The speaker further includes a signal sensor ( 112 ) electrically connected to the voice coil for sensing a response signal occurring in response to the test signal. Additionally, the speaker includes a condition determining module ( 114 ) for determining a driving-point impedance based upon the response signal and for comparing the driving-point impedance to a predetermined impedance to thereby determine a condition of the speaker.
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