A Multi-Channel AC-3 Encoder Architecture Design and Optimization

In order to save the consumption in terms of instruction and storage, to simplify the code, and to enhance the coding quality, this paper, based on the architecture design of the stereo encoder, has analyzed the arranging relationship between the channel and the block in each frame and has optimized the data process and the looping mode of the current encoder. In addition, the start points and the end points of iteration are uniformed as many as possible so that the loop structure can be shared and the loop time could be reduced. It is proved that after the rearrangement of the data structure, the data could be passed down efficiently and clearly. Meanwhile, the design and optimization have done the best preparation for the upgrade of channel (from 2 to 5.1). Besides, the rearrangement of the channel and the block in each frame can reduce the total times of iteration greatly in each frame so that the quality and efficiency of encoding are improved. Finally, the coupling technique is introduced and special process is applied to the low frequency effect channel, giving out the structure of the multi-channel audio encoding which has a uniform structure.