Sixth International Conference on Spoken Language Processing
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,
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.
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.