| 摘要 |
Techniques for activating a voice recognition system are described. The system disclosed can be non verbally started and stopped without the need for the system user to use his or her hands facilitating hands-free operation in an environment with a relatively high degree of ambient background verbal noise. For example, a user may start the voice recognition system by blowing once on a microphone and stop the system by blowing twice on a microphone. The user may alternately start and stop the system by using other nonverbal inputs such as facial expressions, clearing the throat or moving one's head. Such other nonverbal inputs may be detected by pressure sensors or motion sensors. The operational state of the system may alternately be toggled from off to on, or from on to off, with each subsequent nonverbal input.
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