| 摘要 |
PURPOSE:To prevent the generation of howling and an echo by setting the degree of acoustic coupling of a loudspeaker and a microphone to a prescribed value or below. CONSTITUTION:Positions of a microphone 3 and a loudspeaker 4 are placed so that they are not distant from each other, and also, degrees of acoustic coupling of both of them become a prescribed value or below. Also, this system is constituted so that a voice adding circuit 8 adds a sound signal from the microphone 3, and an acoustic echo canceller 5 erases an echo signal from in this added sound signal. In such a way, a voice conference being free from howling and an echo can be executed. |
