Study Of MPEG Audio Layer Ⅲ Coding Algorithm And Its Hardware Implementation

This paper deals with the design and development of a real-time encoding system for MP3 player based on DSP. The focus is placed on the investigation of the standard of the encoding algorithm for MPEG audio layer III, and the analysis of the major four modules in the compression algorithm, including encoding of subband filter bank, psychoacoustics model, quantification and Huffman coding, frame packing. In addition, a comparison is made between music coding and voice coding. On the basis of this, according to the actual application requirements, the hardware system implementing the encoding algorithm is designed and developed. Some key problems in the system development are discussed in detail, such as the DSP chips, the microcontroller, the scheme of data storage, the A/D converter, the LCD and the peripherals of system. The testing results show that the system agrees with the requirments and has a higher ratio of performance to cost.