公开(公告)号：US5534937A

公开(公告)日：1996-07-09

申请号：US227438

申请日：1994-04-14

申请人： Qin-Fan Zhu ,  Mei Yong

发明人： Qin-Fan Zhu ,  Mei Yong

IPC分类号： H04L12/56 ,  H04N7/10 ,  H04N7/26 ,  H04N21/234 ,  H04N21/236 ,  H04N21/434 ,  H04N21/44 ,  H04Q11/04 ,  H04N7/00

CPC分类号： H04N21/23406 ,  H04N19/40 ,  H04N21/236 ,  H04N21/434 ,  H04N21/44004 ,  H04Q11/0478 ,  H04L2012/5616 ,  H04L2012/5649

摘要： The method and device of the present invention provide a mechanism at a network node to compensate for variable delays or delay jitters of video packets transported over a packet-switched network, such as an ATM network, and generate a continuous bitstream to an external decoder. The received video packets with variable delays are first depacketized and stored in a video information buffer and then are sent to the external decoder through another constant or variable bit-rate channel. Based on a hypothetical decoder buffer verifier condition, stuffing bits are inserted into the output video bitstream to prevent the decoder buffer from overflowing. Stuffing bits are sent if one of the following two cases occurs: A) the condition of the hypothetical decoder buffer verifier is violated; B) the video information buffer is empty. A minimum number of stuffing bits are sent each time to minimize the incurred delay and concurrently make the following three conditions satisfied: 1) overflow of the decoder buffer is avoided; 2) idleness of the channel is avoided; 3) the stuffing bits must comply with the syntax of the video bitstream.

摘要翻译： 本发明的方法和装置在网络节点提供一种机制，以补偿通过诸如ATM网络的分组交换网络传输的视频分组的可变延迟或延迟抖动，并且向外部解码器生成连续比特流。 接收到的具有可变延迟的视频分组首先被去包装并存储在视频信息缓冲器中，然后通过另一常数或可变比特率信道被发送到外部解码器。 基于假设的解码器缓冲器验证器条件，填充比特被插入到输出视频比特流中，以防止解码器缓冲器溢出。 如果发生以下两种情况之一，则发送填充位：A）违反假设解码器缓冲区验证器的条件; B）视频信息缓冲区为空。 每次发送最少数量的填充比特，以最小化发生的延迟，同时使满足以下三个条件：1）避免解码器缓冲区的溢出; 2）避免了通道的空闲; 3）填充位必须符合视频比特流的语法。

公开(公告)号：US5253326A

公开(公告)日：1993-10-12

申请号：US797881

申请日：1991-11-26

申请人： Mei Yong

发明人： Mei Yong

IPC分类号： G10L19/02 ,  G10L19/06 ,  H04B14/04 ,  G10L9/14

CPC分类号： G10L19/06

摘要： A priority assignment method and device are set forth for assigning a priority to a selected speech frame coded by a linear predictive coder based on at least two of: an energy of the speech frame, a log spectral distance between a frame and a frame immediately previous, and a pitch predictor coefficient for the selected speech frame. The invention protects against loss of perceptually important and hard-to-reconstruct speech frames.

摘要翻译： 提出了一种优先级分配方法和装置，用于基于以下中的至少两个来分配由线性预测编码器编码的所选择的语音帧的优先级：语音帧的能量，帧和紧接在前的帧之间的对数谱距离 ，以及所选语音帧的音调预测器系数。 本发明可以防止感知上重要和难以重建的语音帧丢失。

公开(公告)号：US5195168A

公开(公告)日：1993-03-16

申请号：US669831

申请日：1991-03-15

申请人： Mei Yong

发明人： Mei Yong

IPC分类号： G10L19/00 ,  G10L19/04 ,  G10L19/08 ,  G10L19/12

CPC分类号： G10L19/083 ,  G10L19/12

摘要： A novel spectral interpolation and efficient excitation codebook search method developed for a Code-Excited Linear Predictive (CELP) speech coder is set forth. The interpolation is performed on an impulse response of the spectral synthesis filter. As the result of using this new set of interpolation parameters, the computations associated with an excitation codebook search in a CELP coder are considerably reduced. Furthermore, a coder utilizing this new interpolation approach provides noticeable improvement in speech quality coded at low bit-rates.

摘要翻译： 阐述了一种针对码激励线性预测（CELP）语音编码器开发的新型频谱插值和高效激励码本搜索方法。 对频谱合成滤波器的脉冲响应进行插值。 作为使用这组新的插值参数的结果，与CELP编码器中的激励码本搜索相关联的计算被显着地减少。 此外，利用这种新插值方法的编码器提供了以低比特率编码的语音质量的显着改进。