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    • 3. 发明授权
    • Method for flexible bit rate code vector generation and wideband vocoder employing the same
    • 用于灵活比特率码矢量生成的方法和采用该方法的宽带声码器
    • US07529663B2
    • 2009-05-05
    • US11216430
    • 2005-08-30
    • Kyung-Jin ByunIk-Soo EoKyung-Soo KimHee-Bum Jung
    • Kyung-Jin ByunIk-Soo EoKyung-Soo KimHee-Bum Jung
    • G10L19/12G10L19/10
    • G10L19/107G10L19/24
    • Provided are a flexible bit rate code vector generation method and a wideband vocoder employing the same. This invention implements a flexible bit rate by getting three code vectors which are composed of 24, 16, and 8 pulses, at a time in a search process, through improvement of an algebraic codebook search process in a wideband AMR-WB vocoder. The method includes the steps of: performing a preprocess, wherein the preprocess divides a sub-frame by tracks and decides a pulse position having a maximum value in each track; among a plurality of pulses to be searched, fixing a same number of pulses as the tracks to the position with the maximum value of each track sequentially, and searching optimal positions having a minimum error with a target signal by combining two pulses in two consecutive tracks for the remaining pulses; and creating a code vector with flexible bit rate.
    • 提供了一种灵活的比特率码矢量生成方法和采用该方法的宽带声码器。 本发明通过在宽带AMR-WB声码器中改进代数码本搜索处理,通过在搜索过程中一次获得由24,16和8脉冲组成的三个码向量来实现灵活的比特率。 该方法包括以下步骤:执行预处理,其中预处理通过磁道划分子帧,并确定每个磁道中具有最大值的脉冲位置; 在要搜索的多个脉冲之间,将相同数量的脉冲固定到具有每个磁道的最大值的位置,并且通过在两个连续的轨道中组合两个脉冲来搜索具有目标信号的最小误差的最佳位置 剩下的脉冲; 并创建一个具有灵活位速率的码矢量。