| 摘要 |
PURPOSE:To automatically control the microphone volume in order to secure the accordance between the volume of the voices delivered through the microphone and the volume of the music source. CONSTITUTION:A reference voice is extracted out of an analog voice signal by a subtractor circuit 14. Then the circuit 14 compares the extracted reference voice with the voices delivered through a microphone. Based on the result of this comparison, a motor driver 17 controls a motor 19 of a microphone volume 18. Thus the microphone volume is controlled so that the volume of the voices delivered through the microphone is accordant with the volume of the music source. |
