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    • 5. 发明授权
    • Turbo decoder using binary LogMAP algorithm and method of implementing the same
    • Turbo解码器采用二进制LogMAP算法和实现方法相同
    • US06772389B2
    • 2004-08-03
    • US09966201
    • 2001-09-26
    • Hyuk KimIn-San JeonWoo-Seok YangKyung-Soo KimHan-Jin Cho
    • Hyuk KimIn-San JeonWoo-Seok YangKyung-Soo KimHan-Jin Cho
    • H03M1345
    • H03M13/3905H03M13/2957H03M13/3927H03M13/6502H03M13/6577
    • Disclosed are a turbo decoder, which applies a base-2 binary LogMAP algorithm in implementing a turbo decoder to thereby reduce the hardware requirement and implement a high-speed turbo decoder, which comprising a split for splitting the sum of two input state metrics into an integral and a decimal part; a comparator for comparing the integral parts of the two state metrics to extract a maximum and a minimum integer; a subtractor for obtaining a difference between the original integral part and the maximum or minimum integer value; a lookup table for calculating the sum of exponential terms of base-2 function in the decimal parts; a shifter for shifting only a decimal part with a smaller integral part by the difference; an adder for adding the decimal part and a decimal part with a larger integral part; a log pre-processing block for applying a base-2 logarithm on the decimal part to thereby obtain a final value for the decimal part; and an adder for adding the maximum integral value and the final value for the decimal part to thereby obtain a final value of the base-2 function.
    • 公开了一种turbo解码器,其在实现turbo解码器中应用基2二进制LogMAP算法,从而降低硬件要求并实现高速turbo解码器,该高速turbo解码器包括用于将两个输入状态度量的和分解为 积分和小数部分; 用于比较两个状态度量的积分部分以提取最大和最小整数的比较器; 用于获得原始积分部分与最大或最小整数值之间的差的减法器; 用于计算小数部分中base-2函数的指数项的和的查找表; 移位器,用于仅移动具有较小整数部分的小数部分的差值; 用于将小数部分和小数部分与较大整数部分相加的加法器; 用于在小数部分应用基2对数的日志预处理块,从而获得小数部分的最终值; 以及加法器,用于将最大积分值和小数部分的最终值相加,从而获得基2功能的最终值。
    • 6. 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。