Patents by Inventor Jeff L. Schenck

Jeff L. Schenck 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).

  • System and method for controlling a filter to enhance speakerphone performance
    Patent number: 6785382
    Abstract: In a speakerphone system, the signal that is directed to a loudspeaker is filtered by a dynamically controllable highpass filter. The filter characteristics are adjusted on the basis of the power of the signal and the degree of recent microphone activity. The filtered signal is a far-talker signal, while the microphone activity is represented as a near-talker signal that includes an echo component as a consequence of loudspeaker-to-microphone coupling. The degree of microphone activity is determined by a subband analyzer. A noise floor estimator may be used to determine the degree to which the near-talker signal is comprised of background noise, so that the noise can be eliminated in the process of controlling the highpass filter.
    Type: Grant
    Filed: January 8, 2002
    Date of Patent: August 31, 2004
    Assignee: Signalworks, Inc.
    Inventors: Hugh J. McLaughlin, Tamara L. Logan, Jeff L. Schenck
  • System and method for controlling a filter to enhance speakerphone performance
    Publication number: 20020154761
    Abstract: In a speakerphone system, the signal that is directed to a loudspeaker is filtered by a dynamically controllable highpass filter. The filter characteristics are adjusted on the basis of the power of the signal and the degree of recent microphone activity. The filtered signal is a far-talker signal, while the microphone activity is represented as a near-talker signal that includes an echo component as a consequence of loudspeaker-to-microphone coupling. The degree of microphone activity is determined by a subband analyzer. A noise floor estimator may be used to determine the degree to which the near-talker signal is comprised of background noise, so that the noise can be eliminated in the process of controlling the highpass filter.
    Type: Application
    Filed: January 8, 2002
    Publication date: October 24, 2002
    Inventors: Hugh J. McLaughlin, Tamara L. Logan, Jeff L. Schenck