JP2904279B

• Main Authors: UMEDA TETSUO, TSUGI TOORU
• Format: Patent
• Language: English
• Published: 14.06.1999
• Edition: 6
• Subjects: ACOUSTICS; MUSICAL INSTRUMENTS; PHYSICS; SPEECH ANALYSIS OR SYNTHESIS; SPEECH OR AUDIO CODING OR DECODING; SPEECH OR VOICE PROCESSING; SPEECH RECOGNITION

PURPOSE:To hold clearness and naturalness by varying the spectral envelope of a unit speech waveform according to 1st and 2nd spectral variation components. CONSTITUTION:A speech frequency correction part 4 obtains the pitch frequency of a voiced section and its time track from a unit voice obtained by a unit voice selection part 2. A formant correction part 6 determines formant as to the voiced section according to the shape (resonance frequency) of the spectral envelope and finds its track. Then a frequency characteristic variation part 8 varies the spectral envelope of the waveform which is expanded or compressed according to the variation of a pitch frequency according to the spectral variation found by the formant correction part and the spectral variation found by the vocal chord frequency correction part. Consequently, the phoneme and naturalness of each unit speech are maintained and a speech of high quality to which phoneme information is added is synthesized.