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Power-efficient voice activation

  • US 9,142,215 B2
  • Filed: 06/15/2012
  • Issued: 09/22/2015
  • Est. Priority Date: 06/15/2012
  • Status: Active Grant
First Claim
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1. A voice activation system, comprising:

  • a first module configured to receive an audio signal and output a first activation signal if at least one energy characteristic of the audio signal satisfies at least one threshold of one or more thresholds stored in a memory;

    a second module configured to transition from a first state to a second state in response to the first activation signal, compute one or both of a time and frequency profile of the audio signal when in the second state, and output a second activation signal if at least a portion of the computed time or frequency profile of the audio signal substantially matches at least one predetermined time or frequency profile indicative of speech in the audio signal; and

    a speech recognition engine coupled to the second module and configured to transition from a first state to a second state based on the second activation signal and if a wake-up word determination state is enabled, or transition from the first state to a third state based on the second activation signal and if the wake-up word determination state is disabled, wherein the speech recognition engine is configured to receive the audio signal and determine a speech content of the received audio signal;

    wherein the first module is configured to consume less power than the second module, wherein the second module is configured to consume less power than both the second and third states of the speech recognition engine, wherein the second state of the speech recognition engine is configured to consume less power than the third state of the speech recognition engine, and wherein the first module, second module, and speech recognition engine are implemented on one or more computing devices, and wherein the voice activation system includes the one or more computing devices.

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