When system clock is 70MHZ, speech system can work at 29.92KBps and 33.98KBps for encoding and decoding and MP3 system can decode a fram in 23.82ms. Audio system has been real-time.

• 最后的整机性能测试结果表明；在系统时钟70MHZ情况下；语音子系统性能达到编码29.；92KBps、解码33