| 摘要 |
PROBLEM TO BE SOLVED: To reduce an operation amount for extracting a pitch component when a speech speed is changed and to suppress the occurrence of discontinuity on a connection point of a voice elemental piece inserted for voice expansion. SOLUTION: In a speech speed changing device constituted as a decoder answering to a coder of a voice compression coding system, an expansion means consisting of a pitch expander 7 and a data storage part 8 is provided on a preceding stage of a short period predictive synthetic filter 6 in the decoder operated based on parameter and synthetic filter parameter imparting an optimum voice source transmitted from the coder. Then, the voice elemental piece by one pitch is extracted from a voice source signal to which a formant component is not added, and this voice elemental piece is inserted into the voice source signal by the number of required pieces. |
