Platform-Based Design for MPEG AAC Decoder with High Quality Re-quantization Algorithm

• Main Authors: Chuh-Chu Yen, 顏誌助
• Other Authors: Tsung-Han Tsai
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/11922511220745693342

碩士 === 國立中央大學 === 電機工程研究所 === 92 === MPEG-1 Layer III (MP3) audio coding has been the most popular standard for these years. Moreover, a new higher quality audio coding standard “Advanced Audio Coding (AAC)” has been proposed and widely used now. AAC is a high-quality perceptual audio coder developed by Moving Picture Experts Group (MPEG). It has been standardized as ISO 13818-7 in April 1997. The quantization/re-quantization is an essential block in both MP3 and AAC and can affect the coding quality significantly. This paper presents a new high accuracy estimation algorithm and corresponding hardware for MP3 and MEPG-2/4 AAC audio coding. And this paper proposes the techniques to implement MPEG AAC decoding algorithm using the ARM 920T 32-bit RISC processor. We also apply the high quality quantization algorithm to increase the quality and performance. The whole AAC decoding system is designed based on an embedded system with ARM’s Core Module 920T and the Integrator/AP ASIC Development Motherboard. In order to make a real time demonstration, we designed a DAC (Digital to Analog Converter) interface in the Xilinx FPGA chip on the ARM’s Logical Module LM-XCV2000E. It receives the audio PCM data from the Core Module and transfers to the DAC chip for output the audio signal.