In the paper,a real-time audio player based on the ARM7 and the Ethernet is designed.The hosts broadcast audio packets coded by ADPCM to each node in LAN.The node decodes the ADPCM packets,then transfers the PCM datas to UDA1341 audio module for playback through the I2S bus in the type of DMA.In addition,the recorded PCM can be compressed by ADPCM,then upload to the host for save.Not only the host computer could adjust the volume and EQ,each node can also adjust the items by the keyboard.Otherwise,TFT color liquid crystal can display the various states of the system.The practice results show that the system can process the real-time audio in the LAN well.
Key words
voice player /
ARM7 /
ADPCM /
UDA1341
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