Drive control apparatus, electronic device and drive controlling method

A drive control apparatus that drives a vibrating element of an electronic device including a top panel having a manipulation input surface, a position detector detecting a position of a manipulation input performed on the manipulation input surface and the vibrating element generating a vibration in the manipulation input surface, comprising:

• an amplitude modulator configured to modulate an amplitude of a wave signal in an ultrasound-frequency-band in accordance with amplitude data and to output the modulated wave signal as a driving signal to the vibrating element, the driving signal being used for driving the vibrating element, the wave signal generating a natural vibration in the ultrasound-frequency-band in the manipulation input surface, the amplitude data representing an amplitude of the driving signal;
• and
• a drive controller configured to output the amplitude data used for modulating the amplitude of the wave signal to the amplitude modulator and to drive the vibrating element in response to the amplitude data, the drive controller being configured to control the amplitude data so as to switch the natural vibration between a strong level and a weak level in accordance with a travel distance of a position of a manipulation input performed onto the manipulation input surface.