標題: | FRACTIONAL RATE MULTITREE SPEECH CODING |
作者: | GIBSON, JD CHANG, WW 電信工程研究所 Institute of Communications Engineering |
公開日期: | 1-六月-1991 |
摘要: | We present both forward and backward adaptive speech coders that operate at 9.6, 12, and 16 kb/s using integer and fractional rate trees, weighted squared error distortion measures, the (M,L) tree search algorithm, and incremental path map symbol release. We introduce the concept of multitree source codes and illustrate how the multitree structure allows scalar quantizer-based codes and scalar adaptation rules to be used for fractional rate tree coding. With a frequency weighted distortion measure, the forward and backward adaptive multitree coders produce near toll quality speech at 16 kb/s, while the backward adaptive 9.6 kb/s multitree coder substantially outperforms adaptive predictive coding and has an encoding delay less than 2 ms. Performance results are presented in terms of unweighted and weighted signal-to-noise ratio and segmental signal-to-noise ratio, sound spectrograms, and subjective listening tests. |
URI: | http://hdl.handle.net/11536/3761 |
ISSN: | 0090-6778 |
期刊: | IEEE TRANSACTIONS ON COMMUNICATIONS |
Volume: | 39 |
Issue: | 6 |
起始頁: | 963 |
結束頁: | 974 |
顯示於類別: | 期刊論文 |