Patent ID: 9747894
Date: 2017-08-29
CPC Classifications: G10L

Claim:
1. A system for speech keyword detection of a device, comprising: a voice detector for evaluating informativeness of a received incoming sound according to a current volume and a past average volume of the incoming sound, so as to selectively enable the speech keyword detector according to the informativeness; a speech keyword detector for generating a most probable keyword as a preliminary keyword detection result according to the received incoming sound; an activity predictor for obtaining sensor data provided by a plurality of sensors, and processing the sensor data to provide an activity prediction result indicating occurrence of indicative activities which reflect whether a user is about to give a voice keyword; and a decision maker coupled to the activity predictor and the speech keyword detector, for providing a keyword detection result by executing: when the activity prediction result indicates absence of indicative activities, lowering a sensitivity to admit that the most probable keyword is said, so as to suppress false alarm error; and when the activity prediction result indicates presence of indicative activities, raising the sensitivity to admit that the most probable keyword is said, so as to suppress miss error; wherein the voice detector comprises: a first estimator for computing a current sample of a first sequence as a weighted sum of the current volume of the incoming sound and a preceding sample of the first sequence; a second estimator for computing a current sample of a second sequence as a weighted sum of the current volume of the incoming sound and a preceding sample of the second sequence; and a comparator, coupled to the first estimator and the second estimator, comparing the first sequence and the second sequence to indicate the informativeness of the incoming sound.