| 摘要 |
PURPOSE:To extract voice command words at high S/N from the noises generated by an acoustic appliance by providing a noise cancelation unit and subtracting the output signal of a driving unit which drives a speaker from the electric signal converted by a microphone. CONSTITUTION:The noise cancelation means 22 subtracts the output signal of the driving unit 21 which drives the speaker 11 from the electric signal converted by the microphone 12. Even if, therefore, the noises radiated from the speaker 11 are mingled in the electric signal converted by the microphone 12, the noises are offset and erased by the output signal of the driving unit 21. The voice command words are extracted at the high S/N in this way from the noises generated by the acoustic appliance without degrading the functions of the acoustic appliance. |
