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    • 4. 发明授权
    • Method and apparatus for determining speech coding parameters
    • 用于确定语音编码参数的方法和装置
    • US06587817B1
    • 2003-07-01
    • US09478877
    • 2000-01-07
    • Antti VähätaloErkki Paajanen
    • Antti VähätaloErkki Paajanen
    • G10L1914
    • G10L19/265G10L19/025
    • A method which comprises forming a first noise reduction frame (18) containing speech samples; which is windowed by a first window function. For the windowed frame, noise reduction is performed for producing a second noise reduction frame (19; 45). A speech coding frame (44) to be formed comprises noise-reduced samples of at least two successive second noise reduction frames (45, 46), partly summed with one another. On the basis of said speech coding frame (44), a set of speech coding parameters pj are determined. A lookahead part (42) of the speech coding frame is at least partly formed of a first slope (41), the first slope (10, 41) comprising a set of most recent noise-reduced samples of the second noise reduction frame, not summed with the samples of any other second noise reduction frame. The method reduces the delay caused by speech coding and noise reduction.
    • 一种方法,包括形成包含语音样本的第一降噪帧(18); 它被第一个窗口功能所打开。 对于窗框,执行噪声降低以产生第二降噪帧(19; 45)。 要形成的语音编码帧(44)包括彼此部分相加的至少两个连续的第二降噪帧(45,46)的降噪样本。 基于所述语音编码帧(44),确定一组语音编码参数pj。 所述语音编码帧的前视部分(42)至少部分地由第一斜率(41)形成,所述第一斜率(10,41)包括所述第二降噪帧的最近的噪声降低样本集合 与任何其他第二降噪帧的样本相加。 该方法减少了由语音编码和降噪引起的延迟。