基于Si4463的无线语音系统设计

Design of Wireless Voice System Based on Si4463

目前国内短距离无线数字语音产品大多采用硬件对语音数据编解码,成本较高。Speex作为一种基于码激励线性预测(CELP)算法,因其开源、免软件专利费、多采样率、多位率、高质量的特点而被广泛应用于各种嵌入式设备的语音编解码。本文采用最新的Contex-M3 ARM微处理器芯片和射频芯片Si4463设计了一个低功耗、短距离、时分双工的无线语音系统。综合阐述了系统的整体设计、射频芯片的选型、Speex算法在STM32F205RB芯片上的运用。经过反复测试验证,该系统在空旷的环境下,200m以内通信可靠,较好地实现了两点间语音通信的功能。

Currently,short distance wireless digital voice products use hardware to encoding and decoding the voice data cost much.Speex codec based on CELP is widely used in many kinds of embedded devices because the feature of open-source,free from software patent royalties,variable sampling rate,multiple bit-rate and high quality.Using the latest Contex-M3 ARM microcontroller and RF chip Si4463,this paper designs a low-power,short distance,TDD wireless voice system.This paper designs the overall system design,the selection of the RF chips,the Speex codec applied in STM32F205 RB.After repeatedly testing,in the open environment the system can work reliable within 200 meters.