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ARM7TDMI-based SoC chip AC97 module and off-chip CODEC-mated 00. using the ITU-T G.721 algorithm design voice processing system based on a low-end RISC-nuclear voice EC design. The solutions combine SoC chip modules eSRAM performance optimization; Flow-through in the actual prototype tested, coding rate of 19.88 KB/s and decoding rate of 22.68 KB/s achieve real-time voice requirements.