Design of Wireless Voice Receiving Terminal Based on WiFi

Abstract

In view of problems of bad real-time performance and needing set many cables existed in current voice dispatching system, a wireless voice receiving terminal based on WiFi was designed. When the terminal works, wireless transceiver module GS1011 receives data frame from wireless network, STM32 micro-controller receives the data by interrupt mode and stores the data into ring data buffer. When the data in the data buffer is more than playing threshold, STM32 micro-controller reads voice data from the data buffer to decode and broadcast with audio encoding and decoding module VS1053. Meanwhile, the terminal combines RTP protocol with ring data buffer and dynamicly adjusts voice playback speed to eliminate network jittering. The test result showed that respond time of the terminal is less than 1 s, voice signal is stable and eliminates influence of network jittering.

Keywords

• wifi wireless communication, voice communication, voice receiving terminal, network delay, network jittering, data packet sort, speech flow desig