微型机与应用
微型機與應用
미형궤여응용
MICROCOMPUTER & ITS APPLICATIONS
2014年
6期
92-94
,共3页
数字无线对讲机%Cortex-M0%2.4G%语音编码%低功耗%丢包处理
數字無線對講機%Cortex-M0%2.4G%語音編碼%低功耗%丟包處理
수자무선대강궤%Cortex-M0%2.4G%어음편마%저공모%주포처리
digital wireless interphone%Cortex-M0%2.4G%speech coding%low-power%packet loss process
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。
針對銀行營業大廳及小型寫字樓對通信高性價比、短距離和保密性的需求,設計瞭一套專用的數字無線對講繫統。繫統設計中應用瞭基于 Cortex-M0平檯且內置語音處理模塊的 ISD9160芯片作為繫統控製器和使用通用小功率2.4 G 無線收髮芯片 NRF24L01進行數據傳輸。繫統在語音處理上採用 G .721進行語音編碼,同時通過結閤 PLR (丟包恢複)中的交織技術和 PLC (丟包隱藏)中的包複製技術對語音丟包進行處理,從而實現在較低的功耗下達到良好的語音通話效果。測試結果錶明,該繫統在音質、傳輸距離、功耗及成本上均能滿足用戶的需求,具有很高的性價比。
침대은행영업대청급소형사자루대통신고성개비、단거리화보밀성적수구,설계료일투전용적수자무선대강계통。계통설계중응용료기우 Cortex-M0평태차내치어음처리모괴적 ISD9160심편작위계통공제기화사용통용소공솔2.4 G 무선수발심편 NRF24L01진행수거전수。계통재어음처리상채용 G .721진행어음편마,동시통과결합 PLR (주포회복)중적교직기술화 PLC (주포은장)중적포복제기술대어음주포진행처리,종이실현재교저적공모하체도량호적어음통화효과。측시결과표명,해계통재음질、전수거리、공모급성본상균능만족용호적수구,구유흔고적성개비。
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 .