| 摘要 |
PURPOSE:To minimize the intrusion of a noise into a transmitted voice. CONSTITUTION:This device is equipped with an adaptive filter circuit 26 which prepares a signal approximating to the noise intruding into the transmitted voice from a voice signal from a microphone 13 which collects the surrounding noise. The signal from the adaptive filter circuit 26 is subtracted from the voice signal from a first microphone 11 which collects a transmitted voice by a synthesizing means 23, so that the noise intruding into the transmitted voice can be reduced. The output signal from the synthesizing means 23 is transmitted from a voice signal transmitting means. The output signal of the synthesizing means 23 is supplied to the adaptive filter circuit 26, and the characteristic of the adaptive filter circuit 26 is adjusted so that the output power of the output signal of the synthesizing means 23 can be the minimum. |
