MP3 is now the most popular music format. With the appearance of various mobile devices, MP3 is not only played and compressed on the computer. The digital products which played MP3 have been everywhere in the daily life. Because of the development of the embedded system, the commercial electronic products which used in music compress encoding can make further progress.
This thesis implements an open source MP3 Encoder on an embedded system. With Linux as the operating system in the embedded system, the fixed point operation is used to increase the executing speed. Besides, the simplification of math functions and algorithms of analysis filter and the reduction of aliasing reduction are also applied to accelerate further. This thesis focuses on the method of speeding up the program in the embedded system. The noise of sound caused by acceleration is not a key point of this thesis. Finally, I will compare the results before and after the acceleration..