A Window Switching Algorithm for AVS Audio Coding

In this paper, we present a window switching algorithm employed in AVS (audio video coding standard of China) generic audio coding. The algorithm - energy and unpredictability measure based window switching decision (ENUPM-WSD) - achieves high performance to complexity ratio by taking the advantages of both the low complexity of energy based decision in time domain and the high accuracy of unpredictability based decision in frequency domain. It significantly improves encoded audio quality, especially those with large transient portions, while preserves low average computational complexity in AVS generic audio encoder. Due to the merits, it is accepted as a recommendation module of the AVS audio standard.