| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of wide band formants to lay stress on rough structure of spectra, to enhance the quality of a provided wide audio range voice thereby, and to save a memory capacity and an operational amount required for code book search. SOLUTION: In this audio range expanding device, a linear prediction coefficientαis converted into an auto-correlation (r) in a parameter converting part 7, a wide range auto-correlation rw is generated from the auto-correlation (r) in a vector quantizing part 8 and a vector dequantizing part 9, the auto- correlation rw is converted reversely into a wide range linear prediction coefficientαw in a parameter reversely converting part 10, and a wide range voice is synthesized from the prediction coefficientαw in an LPC synthesizing part 11.
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