Power-Efficient Voice Activation
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United States of America Patent
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Sep 21, 2015
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Jun 15, 2012
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Abstract
A voice activation system is provided. The voice activation system includes a first module configured to receive an audio signal and output an activation signal if an energy characteristic of the audio signal satisfies a threshold stored in a memory, a control module configured to enable or disable a third state using a control signal, and a speech recognition engine coupled to the first module and the control module, the speech recognition engine configured to transition between a first state, a second state, and the third state. The speech recognition engine transitions from the first state to the second state in response to the activation signal and in response to the control signal being disabled. The speech recognition engine transitions from the first state to the third state in response to the activation signal and in response to the control signal being enabled. The speech recognition engine transitions from the third state to the second state in response to detection of a wake-up word by the speech recognition engine.
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