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    • 4. 发明申请
    • Apparatus and method for converting pitch delay using linear prediction in speech transcoding
    • 用于在语音转码中使用线性预测转换音调延迟的装置和方法
    • US20050015243A1
    • 2005-01-20
    • US10749779
    • 2003-12-30
    • Eung LeeHyun KimDo KimChang YooSeong SeoDal Jang
    • Eung LeeHyun KimDo KimChang YooSeong SeoDal Jang
    • G10L19/04G10L19/08G10L19/14
    • G10L19/09G10L19/18G10L25/12
    • Provided are an apparatus and method for converting a pitch delay using linear prediction in speech transcoding. A linear interpolating portion linearly interpolates a closed-loop pitch delay decoded by a selected mode vocoder (SMV) speech decoder to make the closed-loop pitch delay fit in a search section for open-loop pitch delays of G.723.1 speech encoder, to obtain a changed closed-loop pitch delay of the SMV decoder. A predicted value calculating portion calculates a predicted pitch delay using linear prediction, based on past closed-loop pitch delays of the G.723.1 speech encoder. A difference calculating portion calculates a difference between the changed closed-loop pitch delay of the SMV speech decoder and the calculated predicted pitch delay. When the calculated difference is less than the predetermined threshold value, a pitch delay determining portion determines the changed closed-loop pitch delay of the SMV speech decoder to be an open-loop pitch delay of the G.723.1 speech encoder. A pitch delay detecting portion detects a closed-loop pitch delay of the G.723.1 speech encoder using a conventional method, based on the determined open-loop pitch delay of the G.723.1 speech encoder.
    • 提供了一种用于在语音代码转换中使用线性预测来转换音调延迟的装置和方法。 线性内插部分线性内插由选择的模式声码器(SMV)语音解码器解码的闭环音调延迟,以使闭环音调延迟适合于用于G.723.1语音编码器的开环音调延迟的搜索部分, 获得SMV解码器的改变的闭环音调延迟。 基于G.723.1语音编码器的过去闭环音调延迟,预测值计算部分使用线性预测来计算预测音调延迟。 差分计算部分计算SMV语音解码器的改变的闭环音调延迟与所计算的预测音调延迟之间的差。 当计算出的差小于预定阈值时,音调延迟确定部分将SMV语音解码器的改变的闭环音调延迟确定为G.723.1语音编码器的开环音调延迟。 基于所确定的G.723.1语音编码器的开环音调延迟,音调延迟检测部分使用常规方法检测G.723.1语音编码器的闭环音调延迟。