Liquid jet apparatus performing pulse modulation on a drive signal

A liquid jet apparatus comprising:

• a drive waveform generator adapted to generate a drive waveform signal;
• a modulator adapted to execute pulse modulation on the drive waveform signal;
• a digital power amplifier adapted to power-amplify the modulated signal, on which the pulse modulation is executed by the modulator;
• and
• a low pass filter adapted to smooth the amplified digital signal obtained by the power-amplification of the digital power amplifier,
• wherein the drive waveform generator stores a sampling frequency data of the pulse modulation in conjunction with data of the drive waveform signal, the sampling frequency data beings arranged so that the modulation period is set with modification by raising the sampling frequency when the potential of the drive waveform signal varies.