In general CELP type vocoders provide good speech quality around 4.8kbps. Among them, G.723.1 developed for Internet Phone and videoconferencing includes two vocoders, 5.3kbps ACELP and 6.3kbps MP-MLQ. Since 6.3kbps MP-MLQ requires large amount of computation for the fixed codebook search, it is difficult to realize real time processing for the Internet-based environment. In order to improve the problem this paper proposes the new method that reduces the processing time up to about 50% of codebook search time. We first decide the gr id bit, and then search the codebook. Grid bit is selected by comparison between the DC-removed original speech and synthesized speech, which is synthesized with only even or odd pulses of target vector.
Cite as: Kim, J.-K., Kim, J.-J., Bae, M.-J. (2000) The reduction of the search time by the pre-determination of the grid bit in the g.723.1 MP-MLQ. Proc. 6th International Conference on Spoken Language Processing (ICSLP 2000), vol. 1, 745-749, doi: 10.21437/ICSLP.2000-185
@inproceedings{kim00b_icslp,
author={Jong-Kuk Kim and Jeong-Jin Kim and Myung-Jin Bae},
title={{The reduction of the search time by the pre-determination of the grid bit in the g.723.1 MP-MLQ}},
year=2000,
booktitle={Proc. 6th International Conference on Spoken Language Processing (ICSLP 2000)},
pages={vol. 1, 745-749},
doi={10.21437/ICSLP.2000-185}
}