| 摘要 |
PURPOSE:To realize a conference telephone system which is used even if the great number of conference members is present, by connecting a plurality of terminals with an unidirectional line in loop and making transmission through addition of voices of all subscribers with a common time slot at each terminal. CONSTITUTION:A plurality of terminals are connected with a line in loop as A B C D A. Each terminal device, e.g., a terminal A receives a synthesized voice of terminals A,B,C and D transmitted from the preceding terminal D and the audio signal of the terminal A before one period is removed and the audio signal of the terminal A developed newly is added and the resultant is transmitted to the next terminal B. A delay circuit DLY is a variable length delay and has a delay time equal to a time circulating the loop, and the audio mixing is made without any trouble by adjusting the delay time, even if the number of conference members changes. |
