在线式公用电话连接设备中的信息处理

Signal Processing in On-Line Card Payphone System

在线式公用电话作为区别于离线式公用电话的新型系统,具有能提供更高的安全性,更及时的维护和监控等优势,将是卡式公用电话的一个发展方向。这里讨论了在线式公用电话连接设备与终端间交互的各种信息的处理,并给出了在设备上实现的结果。

On-line card phone system is different from off-line card phone system. It provides higher security, faster maintenances and surveillances . It will be the future of the public card phone system. This paper discusses at first the signal processing between the on-line card-phone connection unit an d the terminal, and then shows the implementation with DSP.