Patents by Inventor Brian Michael McCarthy

Brian Michael McCarthy 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).

  • Echo canceller
    Publication number: 20030016815
    Abstract: A method of echo cancellation for a signal transmission system in which the size of the step used to adapt filter coefficients is adjusted in accordance with the echo delay and in which stationary signals are avoided by determining when the mean and variance of coefficients obtained from a second order linear predictive coding analysis of successive far end samples exceed preset thresholds.
    Type: Application
    Filed: March 13, 2001
    Publication date: January 23, 2003
    Inventors: Scott David Kurtz, Brian Michael McCarthy
  • Tone detection
    Publication number: 20030012358
    Abstract: A DFT is used to compute the magnitude and phase of the frequencies desired to be detected in a frame of sampled data by performing 2 dot products for each such frequency. The two dot products are calculated using the samples in the frame and an equal number of equally spaced cosine and sine coefficients for each frequency to be detected.
    Type: Application
    Filed: April 25, 2001
    Publication date: January 16, 2003
    Inventors: Scott David Kurtz, Brian Michael McCarthy