| 摘要 |
PURPOSE:To omit the adjustment for echo elimination which is to be implemented before the operation of a voice conference. CONSTITUTION:A pseudo echo transmission circuit 5 outputs a pseudo echo signal at application of power to the device. A speaker 3 outputs a sound of the pseudo echo signal. A microphone 1 outputs a synthesis signal A resulting synthesizing a sound input 11 and a bypass signal 13 of the output from the speaker 3. A subtractor circuit 7 stores a subtraction signal resulting from subtracting the pseudo echo signal from the synthesis signal to a memory circuit 9. |
