| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that, it is often difficult to suitably make a model of noise in a conventional method for encoding noise, resulting in undesirable interrupt, discontinuity, and during conversation, and that background noise is not suitably encoded in a speech encoder of analysis by synthesis like a conventional code-excited linear predictive encoder, particularly in a reduced bit rate. SOLUTION: A speech encoder circuit searches for an optimal gain value for excitation vector discriminated before by both adaptive and fixed codebooks 257 and 261. As shown in Block 307 and Block 309, the speech encoder circuit discriminates the optimal gain by generating synthesized weighted signal, which matches best a first target signal 229 (for minimizing a third error signal), via Block 301 and Block 303. COPYRIGHT: (C)2010,JPO&INPIT |
