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.

Key words: compressed encoding, audio processing, digital signal processing