CPC H03H 17/06 (2013.01) [G01H 15/00 (2013.01); G06F 3/016 (2013.01); H02N 2/06 (2013.01); H03H 7/12 (2013.01)] | 26 Claims |
1. Mechanical impedance identity circuitry comprising:
a first input configured to receive a current signal representative of a current associated with an electromagnetic load during driving of the electromagnetic load by a waveform signal or a signal derived from the waveform signal; and
a second input configured to receive a back electromotive force signal representative of a back electromotive force associated with the electromagnetic load during driving of the electromagnetic load by the waveform signal or the signal derived from the waveform signal; and
an adaptive filter to identify parameters of the mechanical impedance of the electromagnetic load, wherein:
an input of a coefficient control for adapting coefficients of the adaptive filter is a first signal derived from the back electromotive force signal; and
a target of the coefficient control for adapting coefficients of the adaptive filter is a second signal derived from the current signal.
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