The Research And Implemention Of Voice Transmission Based On ZigBee Technology

With the growth of monitoring diversification demand, the limitation of traditional wireless sensor network is increasingly highlighted, and people are eager to realize the transmission of multimedia information over wireless sensor networks. Multimedia information has the characteristics of high-bandwidth and real-time, which bring new chanllenges to multimedia sensor design.The paper builds a wireless voice sensor system based on ZigBee wireless transmission technology.After the analysis of typical ZigBee voice system schemes, a new ZigBee voice transmission system based on ATXMEGA256A3 and AT86RF212 is proposed in the thesis. Stereo audio codec TLV320AIC3254 is added to improve the quality of voice acquisition, and the front-end chip CC1190 is added to achieve power amplifier and low noise amplifier.The paper describes how to create an I2S-like bus from an SPI bus using a 4-bit counter. According to characteristics of the hardware platform, Data interface drivers、RF transceiver drivers and application program has been designed in software system. The Ping-Pong buffer mechanism and G.726 ADCPCM algorithm is implemented to improve transmission of voice in application program.At last, the software and hardware joint debugging for ZigBee voice transmission system was completed. The final test results verify the feasibility of voice communication on ZigBee technology.