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System and method for processor wake-up based on sensor data

  • US 9,349,386 B2
  • Filed: 03/07/2013
  • Issued: 05/24/2016
  • Est. Priority Date: 03/07/2013
  • Status: Active Grant
First Claim
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1. A method executed by a voice activity detector (VAD) comprising a processor, wherein the method comprises:

  • generating a first data from a sensor according to a first sampling rate;

    deriving a second data from a normalized envelope of a subset of the first data according to a second sampling rate that is less than the first sampling rate;

    comparing the second data with a first negative peak value;

    detecting an activity if a difference between the second data and the first peak value exceeds a predetermined threshold;

    comparing the second data with a second negative peak value;

    incrementing the second negative peak value by a fixed amount to obtain the first negative peak value if the second data is not less than the second negative peak value during a predetermined number of clock cycles; and

    setting the first negative peak value to the second negative peak value if the second data is less than the second negative peak value.

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