| http://www.w3.org/ns/prov#value | - r producing the drive signal in the form of a periodic pseudosinusoidal staircase function at a fundamental frequency f, the staircase function having N steps and M discrete nonzero amplitude levels per period, M and N being integers greater than 1 with M being less than N, the circuit means including means for producing the M amplitude levels such that predetermined harmonics of the fundamental f
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