| 摘要 |
PROBLEM TO BE SOLVED: To prevent a transmitter side from receiving an echo by eliminating a sneak path of a voice signal that is easily produced in a subscriber line of a 2/4-wire hybrid configuration at a part of an access device of the voice Internet. SOLUTION: A subscriber line connecting to an extension terminal 7 and an IP network 1 are connected via a voice network access device 5. The voice network access device 5 is provided with an echo cancel circuit 15 that eliminates a voice signal sneaked from an outgoing line 10B of a subscriber line to an incoming line 10A while distinguishing the signal from other signals. Thus, the system connects freely to various networks and transmission reception in real time for a voice signal are attained with high quality. |
