| 摘要 |
PURPOSE:To simplify the constitution of an interruption sound transmitter, by delivering only the interruption digital signal through a switching circuit when an interruption sound is transmitted through the interruption sound transmitter. CONSTITUTION:When no interruption sound is transmitted, the information held at an input digital voice information latching circuit 31 is delivered through a switch circuit 32 and then held at a latching circuit 36 of output digital signal information to be delivered to a digital network NW. When an interruption sound is transmitted, the circuit 32 is switched by an interruption sound transmission control line 33. Then the information held at a latching circuit 35 of digital interruption sound information is held at the circuit 36 to be delivered to the network NW. These informations are demodulated to a voice through the network NW and then transmitted to a subscriber A. |
