Design of Error-Resilient Layered Audio Codec

摘要

Current high quality audio coding techniques mainly focus on coding efficiency, which makes them extremelysensitive to channel noise, especially in high error rate wireless channels. In this work, we propose an errorresilientlayered audio codec (ERLAC) which provides functionalities of both fine-grain scalability and errorresiliency.A progressive quantization, a dynamic segmentation scheme, a frequency interleaving techniqueand an unequal error protection scheme are adopted in the proposed algorithm to construct the final errorrobust layered audio bitstream. The performance of the proposed algorithm is tested under different errorpatterns of WCDMA channels with several test audio materials. Our experimental results show that theproposed approach achieves excellent error resilience at a regular user bit rate of 64 kb/s.