2.4GHz无线VoIP发射器和接收器的开发  

Development of 2.4 GHz wireless VoIP transmitter and receiver

作　　者：葛海江[1] 

机构地区：[1]杭州职业技术学院信电系,浙江杭州310018

出　　处：《机电工程》2013年第1期125-128,共4页Journal of Mechanical & Electrical Engineering

摘　　要：针对在传统的VoIP无线通讯中存在数据包丢失而产生间断数据流的问题,提出了一种基于2.4 GHz的无线VoIP发射器和接收器的设计方案。详细阐述了该方案的硬件设计、音频编解码器设计、无线通讯协议设计及软件设计等。硬件上采用了华邦的音频编解码器与Wireless USB的组合来实现;在音频信号编解码上,提出了一种将PCM转换成ADPCM的编码方式来实现声波数据的有效压缩;在无线通讯上,提出了一种双天线设计方法,有效解决了数据包丢失的问题,同时在射频电路设计中引入了"逐个优化参数"的方法,有效提高了发射功率。测试结果表明,该设计方案对短距离无线音频通讯非常有效。Aiming at discontinuous data stream caused by wireless packet lose at traditional VoIP communications, a method of wireless VoIP transmitter and receiver based on 2.4 GHz was put forward. Wireless VoIP hardware design, wireless communication protocol and firmware design were expounded in detail. The wireless VoIP hardware was realized by the combination of Winbond audio codec and Wireless USB. A PCM converted to ADPCM encoding to effective compression of acoustic data was presented. Comparing with single-antenna, the problems brought by the packet losses were solved through the combination of dual-antenna. In addition, an effective way of increasing RF transmitting power was proposed. The results indicate that the technique based on 2.4 GHz wireless VoIP is suitable for short-range wireless audio communication.

关 键 词：无线VOIP 发射器 接收器 音频编码器 ADPCM 双天线设计 

分 类 号：TN912.3[电子电信—通信与信息系统]