| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve an error characteristic without altering the basic constitution of an encoding device by changing a conventional sound source vector search method (more concretely, error minimization reference (evaluation function) at the time of a search). <P>SOLUTION: In an adaptive code book search, one of the conventional search method and the search method of the present invention can be switched according to information inputted from a transmission line state monitor part 215. That is, the normal search method is used when the state of a transmission line is satisfactory and no packet discarding etc., is observed on the reception side, or the search method of the present invention is used when not (when packet discarding is observed at a discarding rate of, for example,≥5% on the reception side). <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
