Air-pressure type excitation apparatus

An air-pressure type excitation apparatus comprising an actuator equipped with a closed air chamber, electromagnetic switching means which is provided somewhere along an air flow path connected to said air chamber and also which alternately switches a state of communication to said air chamber from two air pressure sources having different air pressures, drive control signal data storage means which stores data of a plurality of drive control signals generated beforehand by drive control signal generation means based on a reference signal correlated with an oscillation frequency of standard signals and an oscillation amplitude of state signals with regard to a plurality of different standard signals and state signals sent from a vibration generation source, and drive control signal output means which reads out drive control signal data from said drive control signal data storage means corresponding to the oscillation frequency of said standard signals and the oscillation amplitude of said state signals when said signals are input, to then output the drive control signal, in such a configuration that said drive control signal is used to control switching operations of said electromagnetic switching means to thereby give birth to a pressure variation inside said air chamber in order to actively suppress control-subject vibration utilizing such excitation force of said actuator as to be based on said pressure variation,

• wherein said drive control signal is pulse-width modulated corresponding to an amplitude of said reference signal, includes at least one pulse for each period of said reference signal, and is synchronized with said standard signal.