Speech transcoder and speech encoder

摘要

A speech transcoder includes a codebook in which a plurality of algebraic codes conforming to a second encoding method to serve as conversion candidates of the algebraic code of a first speech code, and a limiting unit for limiting the plurality of algebraic codes stored in the algebraic codebook to at least one algebraic code having a value equal to that of embedded data embedded in a second speech code to limit the conversion candidates, a determination unit for determining an element code corresponding to a converted speech code from the limited conversion candidates.