Patents by Inventor Barry Michael George Cheetham

Barry Michael George Cheetham 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).

  • Speech coding/decoding using phase spectrum corresponding to a transfer function having at least one pole outside the unit circle
    Patent number: 6219637
    Abstract: A decoder for speech signals receives magnitude spectral information for synthesis of a time-varying signal. From the magnitude spectral information, phase spectrum information is computed corresponding to a minimum phase filter which has a magnitude spectrum corresponding to the magnitude spectral information. From the magnitude spectral information and the phase spectral information, a time-varying signal is generated. The phase spectrum of the signal is modified by phase adjustment.
    Type: Grant
    Filed: March 10, 1998
    Date of Patent: April 17, 2001
    Assignee: Bristish Telecommunications public limited company
    Inventors: Hung Bun Choi, Xiaoqin Sun, Barry Michael George Cheetham
  • Noise reduction apparatus using spectral subtraction or scaling and signal attenuation between formant regions
    Patent number: 5742927
    Abstract: A noise reduction apparatus and method for enhancing noisy speech signal which applies to the spectral component signals of a time-varying input signal either a spectral substraction process or a spectral scaling process followed by signal attenuation in regions of the frequency spectrum lying between identified formant regions.
    Type: Grant
    Filed: October 11, 1995
    Date of Patent: April 21, 1998
    Assignee: British Telecommunications Public Limited Company
    Inventors: Philip Mark Crozier, Barry Michael George Cheetham