Patents by Inventor Olga M. M. Mitchell

Olga M. M. Mitchell 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).

  • Removing reverberative echo components in speech signals
    Patent number: 4166924
    Abstract: A system is disclosed for automatically reducing reverberation in typical voice telecommunications systems. This system uses center clipping levels adaptive to the level of reverberation input speech. In one configuration, the voiceband is divided into two sub-bands and center clipping occurs only for the lower band; costs are reduced with surprisingly little transmission quality sacrifice. Clipping-level holdover circuitry with exponential decay appears to work well for a large variety of reverberant enclosures.
    Type: Grant
    Filed: February 22, 1978
    Date of Patent: September 4, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: David A. Berkley, Olga M. M. Mitchell