公开(公告)号：US6125344A

公开(公告)日：2000-09-26

申请号：US137606

申请日：1998-08-21

申请人： Dong Gyu Kang ,  Jung Chul Lee ,  Sang Hun Kim ,  Jun Park

发明人： Dong Gyu Kang ,  Jung Chul Lee ,  Sang Hun Kim ,  Jun Park

IPC分类号： G10L21/003 ,  G10L21/013 ,  G10L21/04 ,  G10L21/00 ,  G10L13/00

CPC分类号： G10L21/003 ,  G10L21/04 ,  G10L21/013

摘要： The present invention relates to an improved pitch modification method by glottal closure interval extrapolation. It is an object of the present invention to modify pitches of speech signals by the glottal closure interval extrapolation and to maintain quality of the modified speech, when concatenating original speech segments to synthesize speech. An input speech signal is converted into a digital speech signal. A glottal closure interval is detected in the digital speech signal so as to estimate vocal tract parameters by using pitch synchronous analysis. Vocal tract characteristic signals of the glottal closure interval and glottal characteristic signals of a glottal open interval are separated from each other according to the detected glottal closure interval. The separated vocal tract characteristic signals are extrapolated and reduced to a desired pitch length by the estimated vocal tract parameter. The extrapolated and reduced vocal tract characteristic signals are overlapped and added to the separated glottal characteristic signal so as to generate a synthetic speech signal which varies in a desired pitch length.

摘要翻译： 本发明涉及通过声门闭合间隔外推的改进的间距改变方法。 本发明的目的是通过声门闭合间隔外推来修改语音信号的音调，并且当连接原始语音片段以合成语音时，保持修改的语音的质量。 输入语音信号被转换为数字语音信号。 在数字语音信号中检测到声门闭合间隔，以便通过使用音调同步分析来估计声道参数。 根据检测到的声门闭合间隔，声门闭合间隔和声门开放间隔的声门特征信号的声道特征信号彼此分离。 分离的声道特征信号通过估计的声道参数被外推并减小到期望的音高。 外推和降低的声道特征信号被重叠并添加到分离的声门特征信号中，以产生以所需音调长度变化的合成语音信号。