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    • 37. 发明授权
    • Voice coding apparatus, voice decoding apparatus, and voice coding and decoding system
    • 语音编码装置,语音解码装置,语音编码解码系统
    • US06351490B1
    • 2002-02-26
    • US09229301
    • 1999-01-13
    • Masahiro Serizawa
    • Masahiro Serizawa
    • H03K904
    • G10L19/10G10L2019/0008
    • A voice coding apparatus and a voice decoding apparatus are provided in order to improve the coding and decoding efficiency by eliminating useless coding levels. The apparatuses comprises an input terminal 24A for inputting the sub-frame length and for delivering it to the sub-frame dividing circuit 10 and an unit length calculating circuit 32A. The unit length calculating circuit calculates the unit length which determine a pulse interval from the sub-frame length supplied from the input terminal 24A and from a fundamental vector length supplied from the input terminal 26A, and delivers the obtained unit length to the table conversion circuit. The table designing circuit 34A designs the pulse position table based on the number of pulses supplied by the input terminal 26A and the fundamental vector length supplied by the input terminal 26A and deliver the unit length to the table circuit 36A.
    • 提供语音编码装置和语音解码装置,以通过消除无用的编码水平来提高编码和解码效率。 这些装置包括用于输入子帧长度并将其传送到子帧分割电路10的输入端子24A和单位长度计算电路32A。 单位长度计算电路根据从输入端子24A提供的子帧长度和从输入端子26A提供的基本矢量长度计算确定脉冲间隔的单位长度,并将所获得的单位长度传送给表格转换电路 。 表设计电路34A基于由输入端子26A提供的脉冲数和由输入端子26A提供的基波矢量长度来设计脉冲位置表,并将单位长度传递给表电路36A。