2.3 Control algorithm
To control the wheelchair by voice command, a user inputs reaction command and verification command to prevent wrong reaction by the misrecognition. In our sys-tem, the control algorithm is shown in figure 3 and detail is as follows:
1. User inputs a reaction command.
2. Input reaction voice data is recognized and its result word is displayed.
3. When result word is a stop command, go to 7.
4. User inputs a verification command. When any ver-ification command is not input within three seconds, the system considers that recognition result fails and go to 1.
5. Input verification voice data is recognized.
6. When result word is a rejection command, go to 1.
7. Control system sends the target control signal to the wheelchair, and the wheelchair reacts. Go to 1.