Fast decoding and mixing of MPEG-I Layer-II bit streams in Audio workstation
Jia Li · Audio Engineering · 2003
In order to fulfil the audio mixing of the decoded MPEG-I Layer-II bitstreamsin real time in the digital audio workstation, an algorithm is proposed for fast real time mixing of MPEG-I Layer-II audio bitstreams after analyzing the kernel algorithm of the polyphase filters in MPEG I decoder. In this algorithm the comparably time-consuming calculation of sub-band signal synthesizing in decoding is done only once for multiple mixing and the speed of mixing is greatly accelerated. By experiments, the algorithm uses only a quarter of the real time when mixing 8 MPEG-I layer-II bitstreams by PIII 600 MHz PC and this completely satisfies the requirement of professional digital audio station.