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    • 1. 发明授权
    • Speech restoration system and method for concealing packet losses
    • 用于隐藏分组丢失的语音恢复系统和方法
    • US07302385B2
    • 2007-11-27
    • US10615268
    • 2003-07-07
    • Ho Sang SungDae Hwan HwangMoon Keun LeeKi Seung LeeYoung Cheol ParkDae Hee Youn
    • Ho Sang SungDae Hwan HwangMoon Keun LeeKi Seung LeeYoung Cheol ParkDae Hee Youn
    • G10L19/00
    • G10L19/005G10L19/04G10L25/93
    • Provided are a speech restoration system and method for concealing packet losses. The system includes a demultiplexer that demultiplexes an input bit stream and divides the input bit stream into several packets; a packet loss concealing unit that produces and outputs a linear spectrum pair (LSP) coefficient representing the vocal tract of voice and an excitation signal corresponding to a lost frame, when a packet loss occurs; and a speech restoring unit that synthesizes voice using the packets input from the demultiplexer, outputs the result as restored voice, and synthesizes voice corresponding to a lost packet using the LSP coefficient and the excitation signal input from the packet loss concealing unit and outputs the result as restored voice when the lost packet is detected, wherein the packet loss concealing unit repeats linear prediction coefficients (LPCs) of a last-received valid frame, produces a first excitation signal for the lost frame using a time scale modification (TSM) method, when the lost frame is voiceless, and produces a second excitation signal by re-estimating a gain parameter based on the first excitation signal, when the lost frame is voiced.
    • 提供了一种用于隐藏分组丢失的语音恢复系统和方法。 该系统包括解复用器,其对输入比特流进行解复用并将输入比特流分成若干分组; 分组丢失隐藏单元,当发生分组丢失时,产生并输出表示语音的声道的线性频谱对(LSP)系数和对应于丢失帧的激励信号; 以及语音恢复单元,其使用从解复用器输入的分组合成语音,将结果输出为恢复的语音,并且使用从分组丢失隐藏单元输入的LSP系数和激励信号来合成与丢失分组对应的语音,并输出结果 作为在检测到丢失分组时的恢复语音,其中分组丢失隐藏单元重复最后接收的有效帧的线性预测系数(LPC),使用时间缩放修改(TSM)方法产生丢失帧的第一激励信号, 当丢失的帧是无声的,并且当丢失的帧被发音时,通过基于第一激励信号重新估计增益参数来产生第二激励信号。