Patent ID: 9613626
Date: 2017-04-04
CPC Classifications: G10L

Claim:
1. An audio device, coupled to a host device, comprising: an acoustic conversion circuit, configured to convert an acoustic wave into an analog audio signal; an analog-to-digital converter (ADC), coupled to the acoustic conversion circuit, configured to convert the analog audio signal into digital audio data; and a controller comprising: a first-level voice detection circuit, coupled to the acoustic conversion circuit, configured to detect voice activity in the analog audio signal; a second-level voice detection circuit, coupled to the first-level voice detection circuit, configured to detect a beginning syllable of a key phrase in the digital audio data when the voice activity is detected; and a third-level voice detection circuit, coupled to the second-level voice detection circuit, configured to detect the key phrase from the digital audio data only when the beginning syllable of the key phrase is detected in the digital audio data.