Patent ID: 9548047
Date: 2017-01-17
CPC Classifications: G10L

Claim:
1. A method comprising: receiving, by a microphone of an electronic device, a first audio signal including a spoken trigger phrase; estimating, by a processor of the electronic device, the length of the spoken trigger phrase in the first audio signal; determining, by the processor, whether the estimated length of the spoken trigger phrase is less than a lower trigger phrase length threshold; calculating, by the processor, a measure of noise variability of background noise for each frame in the first audio signal; in response to determining that a number of frames of the first audio signal in which the measure of noise variability of background noise is greater than a noise variability threshold exceeds a threshold value, and further in response to determining that the estimated length of the spoken trigger phrase is less than the lower trigger phrase length threshold, rejecting, by the processor, the spoken trigger phrase for trigger phrase model training; and waking, by the electronic device, from a sleep mode in response to receiving a second audio signal including the spoken trigger phrase, wherein the sleep mode is a power-saving mode of operation in which one or more parts of the electronic device are in a low-power state or powered off.