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为了能实时完成数字音频工作站中多路MPEG-ILayer-II音频压缩码流的快速解码混音,在分析MPEG-I解码器中的多相滤波器组这个核心算法的基础上,提出了多路MPEG-ILayer-II码流的快速解码混音算法。此算法在进行混音计算时,只需做一次在解码中较为费时的子带综合滤波计算,大大提高了多路混音的速度。实验表明,用该算法进行8路MPEG-ILayer-II解码混音时,在PI-II600MHz的PC机达到了0.25倍实时的解码速度,完全满足了专业数字音频工作站的要求。
In order to realize the fast decoding and mixing of multiple MPEG-ILayer-II audio compression stream in digital audio workstation in real time, based on the analysis of the core algorithm of polyphase filter bank in MPEG-I decoder, Fast decoding and mixing algorithm for MPEG-ILayer-II stream. When the algorithm is used to perform the mixing calculation, it only needs to do a time-consuming sub-band synthesis filter calculation once decoding, which greatly improves the speed of multi-channel mixing. Experiments show that using the algorithm for 8-channel MPEG-ILayer-II decoding and mixing, the PI-II 600MHz PC achieves 0.25 times the real-time decoding speed, fully meet the requirements of professional digital audio workstations.