公开(公告)号：JPH0895589A

公开(公告)日：1996-04-12

申请号：JP22666794

申请日：1994-09-21

Applicant: IBM JAPAN

Inventor： SAKAMOTO MASAHARU ,  KOBAYASHI MEI ,  SAITO TAKASHI ,  NISHIMURA MASAFUMI

IPC: G10L15/02 ,  G06F17/14 ,  G10L11/00 ,  G10L13/00 ,  G10L13/06 ,  G10L13/08 ,  G10L21/06 ,  G10L3/00 ,  G10L9/16

Abstract: PURPOSE: To provide a stable speech synthesis processing with the reduced tremble of pitch in a speech synthesizer system utilizing a pitch synchronized waveform superposition method. CONSTITUTION: A glottis closing point is made to be the reference point of superposition (pitch mark). Since the glottis closing point is stably and accurately extracted by using a dynamic wavelet transformation, a speech with few trembling and few gurgling is synthesized by its stability. By setting the reference point of superposition on another position from the reference point of waveform cutout, the softer cutout of a wave form is enabled. Extraction of the glottis closing point is performed by searching the local peak of dynamic wavelet transformation, however, preferably the threshold for searching the local peak of dynamic wavelet transformation is adaptively controlled every time when dynamic wavelet transformation is obtained.