Patents by Inventor Roderick Alan Smith

Roderick Alan Smith 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).

  • Improvements in and relating to active sound attenuation
    Patent number: 4122303
    Abstract: A primary sound wave in a confined space is attenuated by a secondary sound wave generated to null with the primary wave. The secondary wave is produced by a first electrical signal representing the primary wave as sensed by a microphone, which is convolved with a second signal derived from the system impulse response as a program of operational steps. A second convolution process can cancel feedback of the secondary sound wave. Downstream residual noise is sensed by a second microphone which feeds a microprocessor which adjusts the convolution processes.
    Type: Grant
    Filed: December 10, 1976
    Date of Patent: October 24, 1978
    Assignee: Sound Attenuators Limited
    Inventors: George Brian Barrie Chaplin, Roderick Alan Smith