LOW-POWER ENVIRONMENT MONITORING AND ACTIVATION TRIGGERING FOR MOBILE DEVICES THROUGH ULTRASOUND ECHO ANALYSIS
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United States of America Patent
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Feb 11, 2016
app pub date -
Aug 7, 2014
filing date -
Aug 7, 2014
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Systems and methods are disclosed that provide for low-power monitoring of the acoustic echo path around a device to enable device triggering based on activity detection in the environment. An ultrasonic (or more generally an acoustic) reference signal is played through a speaker at well-chosen intervals and its echoes recorded through a microphone. The recorded signal is analyzed to obtain an estimation of the total echo path or echo energy. By monitoring this estimation variation, significant changes in the echo path or echo energy can be identified and used as a trigger. In one embodiment, a hand approaching a phone changes the echo path, activating the phone to a power on mode. In another embodiment, a user using a phone close to the ear changes the echo energy, triggering the phone to select the “ear-fit” mode speaker/microphone.
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