| 摘要 |
PROBLEM TO BE SOLVED: To obtain a wideband speech reconstruction system which reconstructs a high-quality wideband speech signal by estimating a stable wideband sound source at more correct amplitude without receiving the influence of the difference in speakers and noise from narrow-band speech or a narrow-band speech code. SOLUTION: The system is equipped with a narrow-band sound source decoding means for forming a narrow-band synthesized tone by using the narrow-band speech code, a spectrum decoding means for estimating a wideband spectrum parameter by using the narrow-band spectrum code separated from the narrow-band speech code, a wideband sound source decoding means for estimating a wideband sound source signal by using the narrow-band sound source code separated from the narrow-band speech code, and a synthesizing means for forming the wideband speech signal from the formed narrow-band synthesized tone, the estimated wideband spectrum parameter and the wideband sound source signal. COPYRIGHT: (C)2004,JPO&NCIPI
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