公开(公告)号：EP3038104A4

公开(公告)日：2016-08-10

申请号：EP14837528

申请日：2014-07-07

Applicant: PANASONIC IP CORP AMERICA

Inventor： EHARA HIROYUKI ,  HORI TAKAKO

IPC: G10L19/12

CPC classification number: G10L19/12 ,  G10L19/005 ,  G10L19/038 ,  G10L19/125 ,  G10L2019/0002 ,  G10L2019/001 ,  G10L2019/0013 ,  G10L2019/0016

Abstract: In a CELP-type speech coding apparatus, switching between an orthogonal search of a fixed codebook and a non-orthogonal search is performed in a practical and effective manner. The CELP-type speech coding apparatus (100) includes a parameter quantization unit (108) that selects an adaptive codebook vector and a fixed codebook vector so as to minimize an error between a synthesized speech signal and an input speech signal. The parameter quantization unit (108) includes a fixed codebook search unit (300) that switches between the orthogonal fixed codebook search and the non-orthogonal fixed codebook search based on a correlation value between a target vector for the fixed codebook search and the adaptive codebook vector obtained as a result of a synthesis filtering process.

Abstract translation: 在CELP型语音编码装置中，以实际有效的方式进行固定码本的正交搜索与非正交搜索之间的切换。 CELP型语音编码装置（100）包括参数量化单元（108），其选择自适应码本矢量和固定码本矢量，以使合成语音信号和输入语音信号之间的误差最小化。 参数量化单元（108）包括固定码本搜索单元（300），其基于固定码本搜索的目标矢量和自适应码本之间的相关值在正交固定码本搜索和非正交固定码本搜索之间进行切换 作为合成滤波处理的结果获得的载体。