| http://www.w3.org/ns/prov#value | - According to one embodiment, the IDRIVE signal may be defined by the following equation: IDRIVE = U 0 ??? [ 1 + sin ??? ( 2 ??? ?? ??? 1 T 0 ??? t - ?? 2 ) ] ??? pulsed waveform ??? [ 0 , 1 : f ] 0 ??? t ??? T 0 where U0 is the voltage gain, which may be set to 5 volts or other suitable voltage level, and the pulsed waveform is set to an ultrasonic frequency (f) such as 50 kHz, according to one ex
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