| 摘要 |
PURPOSE:To prevent the malfunction and misrecognition of a voice recognizing circuit by inputting the difference signal between the voice signal of external equipment from a reception part and a signal from a microphone and further performing control by a vibration sensing and humam body approach sensor, etc. CONSTITUTION:A mean level difference device 7 outputs the difference between mean level values calculated by calculation parts 3 and 6 a control circuit 8 and a switch 9 is opened when the width and frequency of variation per unit time are larger than threshold values to input only a signal from an amplifier 5 to a voice signal difference device 10 or closed when less to input even the signal from the voice signal reception part 2 as well. Then a control circuit 13 combines the signals of the vibration sensor 12 and human body approach sensor 11 to control the input signal to a voice recognition circuit 15. Consequently, unnecessary operation due to a voice of a person other than the user and a noise is eliminated and even when a voice is small, the malfunction and misoperation of the voice recognition circuit can be prevented. |
