Patents Represented by Attorney J. T. Whelan

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  • Voice activity detector for speech signals in variable background noise
    Patent number: 5649055
    Abstract: A voice activity detector (VAD) which determines whether received voice signal samples contain speech by deriving parameters measuring short term time domain characteristics of the input signal, including the average signal level and the absolute value of any change in average signal level, and comparing the derived parameter values with corresponding thresholds, which are periodically monitored and updated to reflect changes in the level of background noise, thereby minimizing clipping and false alarms.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: July 15, 1997
    Assignee: Hughes Electronics
    Inventors: Prabhat K. Gupta, Shrirang Jangi, Allan B. Lamkin, W. Robert Kepley, III, Adrian J. Morris