×

Active noise control using piezoelectric sensors and actuators

  • US 5,668,744 A
  • Filed: 05/05/1995
  • Issued: 09/16/1997
  • Est. Priority Date: 05/05/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for reducing noise generated by the operation of a noise-producing machine comprising:

  • sensing the noise of the machine with a piezoelectric sensor;

    sending an activation signal, responsive to the sensed noise of the machine, to activate a piezoelectric actuator to reduce the noise of the machine, where the piezoelectric actuator is independent of a wave guide;

    sensing a parameter of the machine indicative of the speed of the machine with a second sensor; and

    correcting the activation signal, responsive to the sensed parameter of the machine, to optimize the noise reduction of the piezoelectric material.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×