Patent ID: 7758140

Claim:
A liquid jet apparatus comprising: a plurality of nozzles provided to a liquid jet head; an actuator provided corresponding to each of the nozzles; and a drive unit that applies a drive signal to the actuator, wherein the drive unit includes: a drive waveform signal generator that generates a drive waveform signal providing a basis of a signal for controlling the actuator; a feedback circuit that corrects the drive waveform signal to output a corrected drive waveform signal; a modulator that pulse-modulates the corrected drive waveform signal to output a modulated signal, a digital power amplifier that power-amplifies the modulated signal to output a power-amplified signal; and a low-pass filter that filters the power-amplified signal to supply to the actuator as the drive signal, and wherein the feedback circuit includes, a virtual filter having been fed with data of a frequency characteristic of the low-pass filter and expected capacitances associated with a number of the actuators expected to be driven; and a differentiator that outputs the corrected drive waveform signal, the differentiator differentiating between the drive waveform signal and a feedback signal, the feedback signal having been output from the differentiator and fed back to the differentiator through the virtual filter.