【摘要】 为了开发价廉的单片定点ＤＳＰ声音编码器，对ＭＰＥＧ声音编码标准参考算法的运算量和存储量要求进行了比较深入的分析，综合考虑了编码质量和处理器速度的要求，结合计算机仿真结果，指出了使用单片定点ＤＳＰ实现的关键所在．基于ＡＤ公司的ＡＤＳＰ－２１８１，充分利用其为声音处理优化的硬件结构，设计实现了实时ＭＰＥＧ声音第２层编码的软硬件方案．测试结果表明，在采用基于ＭＡＣ的滤波器精度扩展和改进的心理声学模型算法的条件下，编码质量和实时性都能得到保证更多还原

【Abstract】 To develop a low priced audio encoder using single fix point DSP.The requirements of calculation and memory of MPEG audio encoding reference algorithm are analysed. Taking both the encoding quality and speed of processor into consideration, along with the result of simulation, the critical problem of single fix point DSP implementation are point out. Fully using the property of the hardware optimized for audio processing, we have designed the software and hardware of a real time MPEG audio layer 2 encoding implementation based ADSP 2181 of Analog Device Corp. The test result shows that both encoding quality and real time property can be achieved when MAC based precision extension filter and modified psychoacoustic model are used.更多还原