Design of the Audio Coding Standards for MPEG and AC - 3

ISO MPEG 1/2 and Dolby AC-3 are widely used in the network, wireless, multimedia system and video industry. This dissertation studies the design of audio standards: MPEG-1/2 and AC-3. The perceptual audio coder like MPEG-1/2 and AC-3 can be analyzed through filterbank, psychoacoustic model, stereo matrix, bit allocation/ quantization, and packing block. This dissertation considers the design for the filterbank, psychoacoustic model, stereo matrix, and bit allocation/ quantization. This dissertation summarizes the filterbanks adopted in coding standards and presents a unified fast algorithm for these filter banks. On the psychoacoustic models, the hybrid filterbank is proposed to replace to original frequency analyzer for MPEG audio standards to have efficient computing. On the bit allocation, we analyze the issues in bit allocation and present the efficient method. This dissertation also studies the stereo irrelevancy and presents the new method to achieve good quality.