基于PCI总线的数字录音系统的设计与实现

【作者】 庄晓琼；

【导师】 刘国锦；

【作者基本信息】 南京师范大学 ， 电路与系统， 2007， 硕士

【摘要】 随着计算机技术和程控技术的发展，数字程控交换机的种类越来越多，数字程控调度系统是一种小门数的数字交换机，它可完成特定的调度功能。本论文研究的数字录音系统是数字程控调度系统中的一个组件，它可对数字程控调度系统中的任何通话进行数字录音，并可将数据存储在PC机内，随时回放。数字录音系统在社会的特殊职能部门有很高的应用价值，它便于发生责任事故时进行责任追查。本文采用PCI插卡形式，以PCI总线作为系统板卡的接口，直接将板卡插入PC机主板的插槽内，板卡的另一端将数据线插头与PCM中继的输出输入端连接，话音数据可通过数据线从外部的程控交换网传入到系统内的数字交换网，并存储在数字交换网MT8980的话音存储器内，然后，PC机将话音存储器的话音信号通过PCI接口存入到硬盘内保存。之所以选择PCI局部总线是因为此类总线的性能优越，具有良好的应用前景和很大的实用价值。它的传输速度快，突发速率达132Mbps，数据传输不易丢失，处理能力强，为系统升级提供有力的保障。本系统为全数字化系统，逻辑电路集成在可编程逻辑器件CPLD内，CPLD的使用可降低成本，减小功耗，最主要的是可大大提高系统的可靠性。更多还原

【Abstract】 With the development of computer science and program-controlled exchange technology, many of digital switchs have been appeared. The Digital Programmable Scheduling System is one of the small volume Digital Switchs. It can accomplish the especial coordination function. The digital record system in this article is one part of Digital Programmable Scheduling System. It can record any call in the system and store the voice datas in the computer. The digital record system has the high applied value in the special funtional departments.This article introduces the PCI plug-in card form, and the system card uses the PCI bus as the interface. The card can be directly plugged in the computer’ s mainborad. On the other side of the card, the datawires connect with the output/input pin of PCM circuit. The voiec datas are transferred from outer exchange network to the digital exchange network(MT8980) by the datawire. Then the computer stores the voice datas of MT8980’ s memory in the computer’ s hardware. The reason of choosing the PCI Bus is that it has the good performance and application foregroud. Its transmissin speed is so fast and handing capacity is better than other bus. The most important is that PCI Bus is the strong fundation of system upgrading in the future. This record system is the all digital system, the logic circuits integrate in the Complex Programmable Logic Device(CPLD). The article uses CPLD technology to improve the system reliability , also cuts costs and minishes power consumption.更多还原