Method and apparatus for mitigating false accepts of trigger phrases

摘要

An electronic device includes a microphone that receives an audio signal, and a processor that is electrically coupled to the microphone. The processor detects a trigger phrase in the received audio signal and measure characteristics of the detected trigger phrase. Based on the measured characteristics of the detected trigger phrase, the processor determines whether the detected trigger phrase is valid.

主权项

1. A method comprising:
receiving, by an electronic device operating in a sleep mode, an audio signal; detecting, by the electronic device, a trigger phrase in the audio signal; determining, by the electronic device, an average energy of the trigger phrase over a duration of the trigger phrase; determining, by the electronic device, a maximum energy of the trigger phrase; determining, by the electronic device, a ratio of the maximum energy of the trigger phrase to the average energy of the trigger phrase; determining, by the electronic device, whether the ratio is greater than a threshold value; responsive to determining that the ratio is greater than the threshold value, rejecting the trigger phrase as being invalid; responsive to determining that the ratio is not greater than the threshold value, determining, by the electronic device, that the trigger phrase is valid; and responsive to determining that the trigger phrase is valid:
transitioning, by the electronic device, from operating in the sleep mode to operating in a wake mode;receiving, by the electronic device, at least one voice command; andprocessing, by the electronic device, the at least one voice command.