Wideband speech coder employing T-codes and reversible variable length codes

The performance of speech coders, such as the ITU-T G.722.1 wideband speech coder, that employ nonself-synchronizing variable length codes is greatly affected when the received bit stream is in error. This paper studies the use of T-codes and reversible variable length codes (RVLC) to replace the Huffman codes recommended in the G.722.1 coder in order to improve its robustness when bit errors occur. Preliminary simulation results show significant improvement in coder performance with the proposed schemes.