| 摘要 |
A speech recognition system (in eg. in a mobile phone) stores an input signal from a microphone (100 or 102) in a first buffer (110) and generates a noise-reduced signal (134) in a second block (146) before selecting (140) which of the signals to send to a speech recognition engine (132). Aspects of the invention include the detection (120) and validation (130) of a trigger phrase or pass phrase (eg. hello phone) which, when spoken by an authorised speaker (identified by speaker verification), wakes up the speech recognition engine, with a time delay being applied to either signal stored in buffers (110) and (146) in order to synchronise them. This multi-phase process allows computationally intensive speech recognition to be automatically powered down between uses. |
