Patents by Inventor Andrew J. Langley

Andrew J. Langley has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Adaptive resonator vibration control system
    Patent number: 5621656
    Abstract: This invention relates to control systems for the control of noise and vibration. Resonators with adjustable properties are used in conjunction with an electronic control system to change the noise or vibration in a structure. The invention relates particularly to the control of quasi-periodic noise or vibration comprising one or more harmonics by using one or more adaptive resonators.
    Type: Grant
    Filed: October 11, 1994
    Date of Patent: April 15, 1997
    Assignee: Noise Cancellation Technologies, Inc.
    Inventor: Andrew J. Langley
  • Actively sound reduced muffler having a venturi effect configuration
    Patent number: 5600106
    Abstract: In an actively sound dampened muffler, the improvement of a venturi effect area producing means adjacent an aperture in said muffler near which is mounted a loudspeaker in an enclosure, the venturi effect area preventing hot exhaust gases from impinging on the loudspeaker.
    Type: Grant
    Filed: May 15, 1996
    Date of Patent: February 4, 1997
    Assignee: Noise Cancellation Technologies, Inc.
    Inventor: Andrew J. Langley
  • Active vibration control system for aircraft
    Patent number: 5568557
    Abstract: An active noise and vibration reduction system for canceling noise in aircraft or other passenger carrying transportation systems which utilizes a series of seat mounted microphones and trim mounted speakers in conjunction with a digital controller with a class-D stage power amplifier and which is synched to the aircraft alternator.
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: October 22, 1996
    Assignee: Noise Cancellation Technologies, Inc.
    Inventors: Colin F. Ross, Andrew J. Langley
  • Actively sound reduced muffler having a venturi effect configuration
    Patent number: 5550334
    Abstract: In an actively sound dampened muffler, the improvement of a venturi effect area producing means adjacent an aperture in said muffler near which is mounted a loudspeaker in an enclosure, the venturi effect area preventing hot exhaust gases from impinging on the loudspeaker.
    Type: Grant
    Filed: May 24, 1994
    Date of Patent: August 27, 1996
    Assignee: Noise Cancellation Technologies, Inc.
    Inventor: Andrew J. Langley
  • Active control of machine performance
    Patent number: 5431008
    Abstract: A control system is described for improving continuous dynamical control on the pressure in the outlet or inlet system (3) or both of a machine (1) in order to control the performance of the machine. The system comprises an actuator (4) for varying the pressure in the selected system, a sensor (8) for monitoring the operation of the machine and producing a signal indicative thereof, and control means (5) responsive to the sensor signals for driving the actuator, wherein the control means operates to adjust the machine performance according to predetermined data, to optimise the machine performance. The data may be in a memory (look-up table) or the control means may operate in accordance with an algorithm.
    Type: Grant
    Filed: August 20, 1992
    Date of Patent: July 11, 1995
    Assignee: Noise Cancellation Technologies, Inc.
    Inventors: Colin F. Ross, Andrew J. Langley, Graham P. Eatwell