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    • 3. 发明公开
    • Frame erasure compensation method in a variable rate speech coder
    • 在可变速率语音编码器中的帧擦除补偿方法
    • EP1850326A2
    • 2007-10-31
    • EP07013769.0
    • 2001-04-18
    • Qualcomm, Incorporated
    • Manjunath, SharathHuang, PenjungChoy, Eddie-Lun, Tik
    • G10L19/00
    • G10L21/02G10L19/005G10L19/097
    • A frame erasure compensation method in a variable-rate speech coder includes quantizing, with a first encoder, a pitch lag value for a current frame and a first delta pitch lag value equal to the difference between the pitch lag value for the current frame and the pitch lag value for the previous frame. A second, predictive encoder quantizes only a second delta pitch lag value for the previous frame (equal to the difference between the pitch lag value for the previous frame and the pitch lag value for the frame prior to that frame). If the frame prior to the previous frame is processed as a frame erasure, the pitch lag value for the previous frame is obtained by subtracting the first delta pitch lag value from the pitch lag value for the current frame. The pitch lag value for the erasure frame is then obtained by subtracting the second delta pitch lag value from the pitch lag value for the previous frame. Additionally, a waveform interpolation method may be used to smooth discontinuities caused by changes in the coder pitch memory.
    • 在可变速率语音编码器中的帧擦除补偿方法包括用第一编码器量化当前帧的音调滞后值和等于当前帧的音调滞后值与第一差值之间的差的第一差值音调滞后值 前一帧的音调滞后值。 第二预测编码器仅量化前一帧的第二增量音调滞后值(等于前一帧的音调滞后值与该帧之前的帧的音调滞后值之间的差)。 如果前一帧之前的帧被处理为帧擦除,则通过从当前帧的音调滞后值中减去第一增量音调滞后值来获得前一帧的音调滞后值。 然后通过从先前帧的音调滞后值中减去第二Δ音调滞后值来获得擦除帧的音调滞后值。 另外,可以使用波形插值方法来平滑由编码器音调存储器中的变化引起的不连续性。
    • 8. 发明公开
    • Methods of performing error concealment for digital video
    • Verfahren zurDurchführungvon Fehlerverschleierungfürdigitale视频
    • EP2458867A1
    • 2012-05-30
    • EP12001100.2
    • 2008-03-21
    • Qualcomm Incorporated
    • Teng, Chia-yuanManjunath, Sharath
    • H04N7/26H04N7/68
    • H04N19/00939H04N19/107H04N19/117H04N19/142H04N19/159H04N19/166H04N19/174H04N19/895
    • Error concealment is used to hide the effects of errors detected within digital video information. A complex error concealment mode decision is disclosed to determine whether spatial error concealment (SEC) or temporal error concealment (TEC) should be used. The error concealment mode decision system uses different methods depending on whether the damaged frame is an intra-frame or an inter-frame. If the video frame is an intra-frame then a similarity metric is used to determine if the intra-frame represents a scene-change or not. If the video frame is an intra-frame, a complex multi-termed equation is used to determine whether SEC or TEC should be used. A novel spatial error concealment technique is disclosed for use when the error concealment mode decision determines that spatial error concealment should be used for reconstruction. The novel spatial error concealment technique divides a corrupt macroblock into four different regions, a corner region, a row adjacent to the corner region, a column adjacent to the corner region, and a remainder main region. Those regions are then reconstructed in that order and information from earlier reconstructed regions may be used in later reconstructed regions. Finally, a macroblock refreshment technique is disclosed for preventing error propagation from harming non-corrupt inter-blocks. Specifically, an inter-macroblock may be 'refreshed' using spatial error concealment if there has been significant error caused damage that may cause the inter-block to propagate the errors.
    • 错误隐藏用于隐藏在数字视频信息中检测到的错误的影响。 公开了一种复杂的错误隐藏模式决定,以确定是否应该使用空间误差隐藏(SEC)或时间误差隐藏(TEC)。 错误隐藏模式决策系统根据损坏的帧是帧内帧还是帧间帧,使用不同的方法。 如果视频帧是帧内帧,则使用相似性度量来确定帧内帧是否代表场景变化。 如果视频帧是帧内帧,则使用复数多方程来确定是否应使用SEC或TEC。 当错误隐藏模式决定确定空间错误隐藏应用于重建时,公开了一种新颖的空间误差隐藏技术。 新颖的空间误差隐藏技术将腐败的宏块分为四个不同的区域,一个角区域,一个与该角区域相邻的一行,一个与该角区域相邻的一列,以及一个剩余主区域。 然后以该顺序重建那些区域,并且可以在稍后的重建区域中使用来自较早重建区域的信息。 最后,公开了一种宏块刷新技术,用于防止错误传播损害非破坏的块间。 具体地说,如果存在可能导致块间传播错误的严重错误引起的损坏,则可以使用空间错误隐藏来“刷新”宏块间宏块。