| 摘要 |
PROBLEM TO BE SOLVED: To synthesize a voice of high tone quality by converting a band-limited input voice into a broadband voice having a wide frequency band including the frequency band in the input voice. SOLUTION: This device is equipped with a voice analyzer 101 which separates the band-limited input voice into a narrow-band residue signal and a narrow-band spectrum envelope by taking a voice analysis, a residue band widening unit 102 which generates a broadband residue signal from the narrow- band residue signal, an envelope band widening unit 103 which estimates a broadband spectrum envelope from the narrow-band spectrum envelope, a voice synthesizer 104 which synthesizes a broadband synthesized voice from the broadband residue signal and broadband spectrum envelope, a filter 105 which extracts out-band components other than the frequency band that the input voice has from the broadband synthesized voice, and a voice superposing unit 106 which superposes the waveforms of the out-band components and input voice on the time base to synthesize a broadband voice having a frequency band including the frequency band that the input voice has. |
