| 摘要 |
PURPOSE:To obtain a telephone exchange with high communication quality and high privacy. CONSTITUTION:The information transmitted from a terminal 13 through a data converter 11 is reversely diffused by a data converter 12, a central control part 6 analyzes the obtained control information an exchanging switch is controlled and connected to a receiving side. The voice information obtained by reverse diffusion is reversely diffused and transmitted through an exchanging switch 4 and an extension interface by the data converter 12. |
