In embedded system, multimedia application is more important than before, And these products appearing more often. In addition, handholding devices are more and more popular, so these products¡¦ price is usually chip than others, and they concern more about power consumption. So in our design, we can¡¦t only focus on performance, low power and low cost are become the one of the most important factors. The main contribution of this thesis is that in MP3 multimedia application we analyzed ¡Bestimated and optimized our hardware and software to achieve low power and low cost issues. In software part, we used the skill of optimization to optimize our complied assembly codes. In hardware part, we analyzed the MP3 decode algorithm, found the critical part, and implement them with hardware to hope we can use the smallest hardware cost, to achieve highest acceleration. And we hope that through our research, we can establish a fundament about development a special application platform.

Dolby AC-3, the audio signal compression standard adopted by the United States Advanced Television System Committee (ATSC), and wildly used in other applications DVD and digital TV. In order to improve the compression quality, the AC-3 defines two block lengths for IMDCT, one 512-pt.(long block) and the other 256-pt.(short block,). In the thesis, we realize the AC-3 audio decoder on the ARM-based platform. Our simulation results show that the IMDCT takes about 66% computation time of all decode process. Since the pure software decoding time cannot meet the real time requirement in many high speed applications, we design and implement the IMDCT hardware architecture considering of shore/long transform, the memory allocation for IMDCT, and use look-up tables to reduce the computation load. The HW/SW co-design on the ARM-based platform achieves the real-time requirements.

Multimedia workloads have always held an important role in embedded applications. Products are multifarious, such as various modeling mobile phone, MP3 player which is deft and convenient to carry and PDA which is popular with workers. We touch them all the time in our life. So these kinds of products are usually not high price. If their design cost and production cost are lower than others, then they can earn profits in this competition market. In so much multimedia applications, the most popular MP3 is our research goal. The design methods of multimedia audio application are using high performance CPU or combining general purpose processor with a DSP. Their performance satisfied the demand of multimedia application really, but the system hardware cost will increase at the same time. It is not the best solution in embedded products which emphasizing that low cost is better than high performance. So, my thesis will focus on MP3 algorithm optimization. We analyzed MP3 decoder algorithms, and found out the key operation. Using the SIMD operation feature of low cost multimedia processor development from our lab (It¡¦s named ME-MCU) to accelerate the processor speed. Then, I don¡¦t need a strong CPU or DSP, and I also can complete the MP3 decode operations as well. When I optimized the MP3 algorithm, I hope to provide some suggestion for ME-MCU modification. And the multimedia application will more agree with ME-MCU.