摘要
针对银行营业大厅及小型写字楼对通信高性价比、短距离和保密性的需求,设计了一套专用的数字无线对讲系统。系统设计中应用了基于Cortex-M0平台且内置语音处理模块的ISD9160芯片作为系统控制器和使用通用小功率2.4 G无线收发芯片NRF24L01进行数据传输。系统在语音处理上采用G.721进行语音编码,同时通过结合PLR(丢包恢复)中的交织技术和PLC(丢包隐藏)中的包复制技术对语音丢包进行处理,从而实现在较低的功耗下达到良好的语音通话效果。测试结果表明,该系统在音质、传输距离、功耗及成本上均能满足用户的需求,具有很高的性价比。
Considering the demand of high performance-price ratio , closer and secrecy for communication in bank hall and small office building , this paper designs the specialized digital wireless intercom system . The system uses ISD9160 chip which is based on Cortex-M0 platform and built-in voice processing module as system controller and the low-power wireless transceiver chip NRF24L01 use to transmit data . It is worth mentioning that the voice processing , which takes advantage of G . 721 to complete speech coding , combines interleaving technique of PLR （ packet loss recovery ） with replication technique of PLC （ packet loss con-cealment ） to deal with packet loss , as a result we got good voice quality in condition of low-power . The results show that： the system can meet the needs of tone quality , transmission distance and power dissipation , it is cost-effective as well .
出处
《微型机与应用》
2014年第6期92-94,共3页
Microcomputer & Its Applications
