Sixth International Conference on Spoken Language Processing
(ICSLP 2000)

Beijing, China
October 16-20, 2000

The Reduction of the Search Time by the Pre-Determination of the Grid Bit in the G.723.1 MP-MLQ

Jong-Kuk Kim, Jeong-Jin Kim, Myung-Jin Bae

Dept. of Information & Telecommunication, Soongsil University, Seoul, Korea

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.

Full Paper

Bibliographic reference.  Kim, Jong-Kuk / Kim, Jeong-Jin / Bae, Myung-Jin (2000): "The reduction of the search time by the pre-determination of the grid bit in the g.723.1 MP-MLQ", In ICSLP-2000, vol.1, 745-749.