Patents Assigned to Active Noise and Vibration Technologies, Inc.
  • Active sound and/or vibration control
    Patent number: 5365594
    Abstract: A signal processing system, especially for use in vibration control, wherein noise-free signals inductive of the timing of a primary source and of the timing of at least one interfering secondary source of periodic vibrations are provided as inputs, together with a vibration input signal derived from a sensor sampling the vibrations, and wherein the signals are processed to produce an output representative of interference free vibration of the primary source.
    Type: Grant
    Filed: November 10, 1992
    Date of Patent: November 15, 1994
    Assignee: Active Noise and Vibration Technologies, Inc.
    Inventors: Colin F. Ross, Graham P. Eatwell
  • Active control of vibration
    Patent number: 5348124
    Abstract: A method of and system for active vibration control in an elongate member such as a pipe (2), wherein an actuator which comprises at least one constrictive element (3) capable of changing its length is attached between flanges (1) spaced along the member and is controlled to produce deformations of the member which inhibit the transmission of unwanted vibration from the member to one side of the attached actuator to the other side.
    Type: Grant
    Filed: December 17, 1991
    Date of Patent: September 20, 1994
    Assignee: Active Noise and Vibration Technologies, Inc.
    Inventor: Mark F. L. Harper
  • Signal processing system for sensing a periodic signal in the presence of another interfering signal
    Patent number: 5311446
    Abstract: A signal processing system, especially for use in vibration control, wherein noise-free signals inductive of the timing of a primary source and of the timing of at least one interfering secondary source of periodic vibrations are provided as inputs, together with a vibration input signal derived from a sensor sampling the vibrations, and wherein the signals are processed to produce an output representative of interference free vibration of the primary source.
    Type: Grant
    Filed: July 8, 1992
    Date of Patent: May 10, 1994
    Assignee: Active Noise and Vibration Technologies, Inc.
    Inventors: Colin F. Ross, Graham P. Eatwell
  • Single cavity automobile muffler
    Patent number: 5272286
    Abstract: A noise suppression system for use on internal combustion engines and small enough for use in automotive applications is disclosed. A cancellation noise generator and actuator speakers produce a noise to combine with and cancel the engine noise carried in exhaust gases in a mixing chamber. The resultant noise leaving the mixing chamber is measured by a circular tubular microphone array to control the noise generator.
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: December 21, 1993
    Assignee: Active Noise and Vibration Technologies, Inc.
    Inventors: John J. Cain, Dennis Barnes, David A. Dye
  • Active vibration control
    Patent number: 5209326
    Abstract: A method of and a system for active vibration control of an extended mechanical structure having a point or region at which unwanted vibrations are to be reduced or suppressed, wherein a plurality of uni-axial inertial actuators (4, 5) are disposed to act on a rigid intermediate part such as a flange (1) attached to the point or region of the structure. The actuators may be controlled by an electronic controller (35, FIG. 3) to which are fed control signals from accelerometer sensors (27, 28) adjacent the flange (11).
    Type: Grant
    Filed: September 12, 1991
    Date of Patent: May 11, 1993
    Assignee: Active Noise and Vibration Technologies Inc.
    Inventor: Mark F. L. Harper
  • Noise suppression system
    Patent number: 5133017
    Abstract: A noise cancellation system, comprising a symmetrical assembly of microphone inputs is disclosed. A controller receives the output of the microphone assembly and generates an electrical cancellation signal having a polarity opposite the polarity of a portion of a noise to be cancelled and a magnitude equal to the magnitude of the portion of the noise to be cancelled. An actuator receives the electrical cancellation signal and outputs an audio cancellation signal.
    Type: Grant
    Filed: April 9, 1990
    Date of Patent: July 21, 1992
    Assignee: Active Noise and Vibration Technologies, Inc.
    Inventors: John J. Cain, Jamie Chait, David Dye, Dennis Barnes