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31. 发明授权

US07590531B2 Robust decoder 有权
标题翻译：强大的解码器
公开(公告)号：US07590531B2
公开(公告)日：2009-09-15
申请号：US11197792
申请日：2005-08-04
申请人： Hosam A. Khalil , Tian Wang , Kazuhito Koishida , Xiaoqin Sun , Wei-Ge Chen
发明人： Hosam A. Khalil , Tian Wang , Kazuhito Koishida , Xiaoqin Sun , Wei-Ge Chen
IPC分类号： G10L21/02
CPC分类号： G10L21/045 , G10L19/005
摘要： Techniques and tools related to delayed or lost coded audio information are described. For example, a concealment technique for one or more missing frames is selected based on one or more factors that include a classification of each of one or more available frames near the one or more missing frames. As another example, information from a concealment signal is used to produce substitute information that is relied on in decoding a subsequent frame. As yet another example, a data structure having nodes corresponding to received packet delays is used to determine a desired decoder packet delay value.
摘要翻译：描述与延迟或丢失的编码音频信息相关的技术和工具。例如，基于一个或多个因素选择一个或多个缺失帧的隐藏技术，所述一个或多个因素包括一个或多个缺失帧附近的一个或多个可用帧中的每一个的分类。作为另一示例，来自隐藏信号的信息用于产生在对后续帧进行解码时所依赖的替代信息。作为另一示例，使用具有与接收到的分组延迟相对应的节点的数据结构来确定期望的解码器分组延迟值。

32. 发明申请

US20080040105A1 Sub-band voice codec with multi-stage codebooks and redundant coding 有权
公开(公告)号：US20080040105A1
公开(公告)日：2008-02-14
申请号：US11973689
申请日：2007-10-09
申请人： Tian Wang , Kazuhito Koishida , Hosam Khalil , Xiaoqin Sun , Wei-Ge Chen
发明人： Tian Wang , Kazuhito Koishida , Hosam Khalil , Xiaoqin Sun , Wei-Ge Chen
IPC分类号： G10L19/12
CPC分类号： G10L19/005 , G10L19/12 , G10L2019/0005
摘要： Techniques and tools related to coding and decoding of audio information are described. For example, redundant coded information for decoding a current frame includes signal history information associated with only a portion of a previous frame. As another example, redundant coded information for decoding a coded unit includes parameters for a codebook stage to be used in decoding the current coded unit only if the previous coded unit is not available. As yet another example, coded audio units each include a field indicating whether the coded unit includes main encoded information representing a segment of an audio signal, and whether the coded unit includes redundant coded information for use in decoding main encoded information.

33. 发明授权

US07177804B2 Sub-band voice codec with multi-stage codebooks and redundant coding 有权
公开(公告)号：US07177804B2
公开(公告)日：2007-02-13
申请号：US11142605
申请日：2005-05-31
申请人： Tian Wang , Kazuhito Koishida , Hosam A. Khalil , Xiaoqin Sun , Wei-Ge Chen
发明人： Tian Wang , Kazuhito Koishida , Hosam A. Khalil , Xiaoqin Sun , Wei-Ge Chen
IPC分类号： G10L19/00
CPC分类号： G10L19/005 , G10L19/12 , G10L2019/0005
摘要： Techniques and tools related to coding and decoding of audio information are described. For example, redundant coded information for decoding a current frame includes signal history information associated with only a portion of a previous frame. As another example, redundant coded information for decoding a coded unit includes parameters for a codebook stage to be used in decoding the current coded unit only if the previous coded unit is not available. As yet another example, coded audio units each include a field indicating whether the coded unit includes main encoded information representing a segment of an audio signal, and whether the coded unit includes redundant coded information for use in decoding main encoded information.

34. 发明申请

US20060271357A1 Sub-band voice codec with multi-stage codebooks and redundant coding 有权
标题翻译：具有多级码本和冗余编码的子带语音编解码器
公开(公告)号：US20060271357A1
公开(公告)日：2006-11-30
申请号：US11197914
申请日：2005-08-04
申请人： Tian Wang , Kazuhito Koishida , Hosam Khalil , Xiaoqin Sun , Wei-Ge Chen
发明人： Tian Wang , Kazuhito Koishida , Hosam Khalil , Xiaoqin Sun , Wei-Ge Chen
IPC分类号： G10L19/12
CPC分类号： G10L19/005 , G10L19/12 , G10L2019/0005
摘要： Techniques and tools related to coding and decoding of audio information are described. For example, redundant coded information for decoding a current frame includes signal history information associated with only a portion of a previous frame. As another example, redundant coded information for decoding a coded unit includes parameters for a codebook stage to be used in decoding the current coded unit only if the previous coded unit is not available. As yet another example, coded audio units each include a field indicating whether the coded unit includes main encoded information representing a segment of an audio signal, and whether the coded unit includes redundant coded information for use in decoding main encoded information.
摘要翻译：描述与音频信息的编码和解码相关的技术和工具。例如，用于解码当前帧的冗余编码信息包括仅与先前帧的一部分相关联的信号历史信息。作为另一示例，用于对已编码单元进行解码的冗余编码信息包括仅当前一编码单元不可用时才将用于解码当前编码单元的码本级的参数。作为另一示例，编码音频单元各自包括指示编码单元是否包括表示音频信号的段的主编码信息的字段，以及编码单元是否包括用于解码主编码信息的冗余编码信息。

35. 发明申请

US20050228651A1 Robust real-time speech codec 有权
标题翻译：强大的实时语音编解码器
公开(公告)号：US20050228651A1
公开(公告)日：2005-10-13
申请号：US10816466
申请日：2004-03-31
申请人： Tian Wang , Hosam Khalil , Kazuhito Koishida , Wei-Ge Chen , Mu Han
发明人： Tian Wang , Hosam Khalil , Kazuhito Koishida , Wei-Ge Chen , Mu Han
IPC分类号： G10L11/06 , G10L19/08
CPC分类号： G10L19/08 , G10L19/005 , G10L19/22
摘要： Various strategies for rate/quality control and loss resiliency in an audio codec are described. The various strategies can be used in combination or independently. For example, a real-time speech codec uses intra frame coding/decoding, adaptive multi-mode forward error correction [“FEC”], and rate/quality control techniques. Intra frames help a decoder recover quickly from packet losses, while compression efficiency is still emphasized with predicted frames. Various strategies for inserting intra frames and signaling intra/predicted frames are described. With the adaptive multi-mode FEC, an encoder adaptively selects between multiple modes to efficiently and quickly provide a level of FEC that takes into account the bandwidth currently available for FEC. The FEC information itself may be predictively encoded and decoded relative to primary encoded information. Various rate/quality and FEC control strategies allow additional adaptation to available bandwidth and network conditions.
摘要翻译：描述了音频编解码器中的速率/质量控制和丢失弹性的各种策略。各种策略可以组合使用或独立使用。例如，实时语音编解码器使用帧内编码/解码，自适应多模式前向纠错[“FEC”]和速率/质量控制技术。帧内帧帮助解码器从分组丢失中快速恢复，而预测帧仍然强调压缩效率。描述了用于插入帧内和信令帧内/预测帧的各种策略。利用自适应多模式FEC，编码器在多种模式之间自适应地选择以有效且快速地提供考虑到当前可用于FEC的带宽的FEC级别。 FEC信息本身可以相对于主编码信息进行预测编码和解码。各种速率/质量和FEC控制策略允许对可用带宽和网络条件进行额外的调整。

36. 发明授权

US08712783B2 Entropy encoding and decoding using direct level and run-length/level context-adaptive arithmetic coding/decoding modes 有权
标题翻译：使用直接级和游程长度/级别上下文自适应算术编码/解码模式进行熵编码和解码
公开(公告)号：US08712783B2
公开(公告)日：2014-04-29
申请号：US13306761
申请日：2011-11-29
申请人： Sanjeev Mehrotra , Wei-Ge Chen
发明人： Sanjeev Mehrotra , Wei-Ge Chen
IPC分类号： G10L19/02 , H03M7/46 , H03M7/48
CPC分类号： G10L19/032 , H03M7/40 , H03M7/4006 , H03M7/4093 , H03M7/46
摘要： An encoder performs context-adaptive arithmetic encoding of transform coefficient data. For example, an encoder switches between coding of direct levels of quantized transform coefficient data and run-level coding of run lengths and levels of quantized transform coefficient data. The encoder can determine when to switch between coding modes based on a pre-determined switch point or by counting consecutive coefficients having a predominant value (e.g., zero). A decoder performs corresponding context-adaptive arithmetic decoding.
摘要翻译：编码器执行变换系数数据的上下文自适应算术编码。例如，编码器在量化变换系数数据的直接电平的编码和运行长度的运行电平编码和量化的变换系数数据的电平之间切换。编码器可以基于预定的切换点或通过计算具有主要值（例如，零）的连续系数来确定何时在编码模式之间切换。解码器执行相应的上下文自适应算术解码。

37. 发明授权

US08190425B2 Complex cross-correlation parameters for multi-channel audio 有权
标题翻译：多通道音频的复杂互相关参数
公开(公告)号：US08190425B2
公开(公告)日：2012-05-29
申请号：US11336403
申请日：2006-01-20
申请人： Sanjeev Mehrotra , Wei-Ge Chen
发明人： Sanjeev Mehrotra , Wei-Ge Chen
IPC分类号： G10L19/02
CPC分类号： H04S3/008
摘要： An audio encoder encodes a combined channel (e.g., a sum channel) for a group of plural physical audio channels. The encoder determines plural parameters for representing individual physical channels of the group as modified versions of the encoded combined channel. The plural parameters comprise ratios of power in each individual channel to power in the combined channel (e.g., a ratio of the power of a right channel to the power of the combined channel, and a ratio of the power of the left channel to the power of the combined channel). The plural parameters can include a complex parameter. The combined channel and the plural parameters facilitate reconstruction at the audio decoder of source channels. An audio decoder performs a forward complex transform on the multi-channel audio data and reconstructs plural channels from the multi-channel audio data. The decoder can maintain second-order statistics for the source channels.
摘要翻译：音频编码器对一组多个物理音频通道的组合通道（例如，和通道）进行编码。编码器确定用于表示组的各个物理信道的多个参数，作为编码组合信道的修改版本。多个参数包括每个单独信道中的功率与组合信道中的功率的比率（例如，右信道的功率与组合信道的功率的比率，以及左信道的功率与功率的比率的组合通道）。多个参数可以包括复参数。组合通道和多个参数便于在源通道的音频解码器上进行重建。音频解码器对多声道音频数据执行前向复合变换，并从多声道音频数据重建多个声道。解码器可以维护源通道的二阶统计。

38. 发明授权

US07840403B2 Entropy coding using escape codes to switch between plural code tables 有权
标题翻译：熵编码使用转义码在多个代码表之间切换
公开(公告)号：US07840403B2
公开(公告)日：2010-11-23
申请号：US12127707
申请日：2008-05-27
申请人： Sanjeev Mehrotra , Wei-Ge Chen
发明人： Sanjeev Mehrotra , Wei-Ge Chen
IPC分类号： H03M7/40 , H03M7/42 , G10L21/00
CPC分类号： G10L19/032 , H03M7/40 , H03M7/4006 , H03M7/4093 , H03M7/46
摘要： An audio encoder performs entropy encoding of audio data. For example, an audio encoder determines whether a first code table in a group of plural code tables contains a code representing a first vector. If it does, the code is used, and otherwise the escape code from the first code table is used and the first vector is encoded using, at least in part, a second code table. An audio decoder performs corresponding entropy decoding.
摘要翻译：音频编码器执行音频数据的熵编码。例如，音频编码器确定多个代码表的组中的第一代码表是否包含表示第一向量的代码。如果是，则使用代码，否则使用来自第一代码表的转义代码，并且使用至少部分地第二代码表来对第一向量进行编码。音频解码器执行相应的熵解码。

39. 发明授权

US07630882B2 Frequency segmentation to obtain bands for efficient coding of digital media 有权
标题翻译：频率分割以获得有效编码数字媒体的频带
公开(公告)号：US07630882B2
公开(公告)日：2009-12-08
申请号：US11183087
申请日：2005-07-15
申请人： Sanjeev Mehrotra , Wei-Ge Chen
发明人： Sanjeev Mehrotra , Wei-Ge Chen
IPC分类号： G10L19/14 , G10L19/02 , G10L19/00
CPC分类号： G10L19/0208 , G10L19/24
摘要： Frequency segmentation is important to the quality of encoding spectral data. Segmentation involves breaking the spectral data into units called sub-bands or vectors. Homogeneous segmentation may be suboptimal. Various features are described for providing spectral data intensity dependent segmentation. Finer segmentation is provided for regions of greater spectral variance and coarser segmentation is provided for more homogeneous regions. Sub-bands which have similar characteristics may be merged with very little effect on quality, whereas sub-bands with highly variable data may be better represented if a sub-band is split. Various methods are described for measuring tonality, energy, or shape of a sub-band. These various measurements are discussed in light of making decisions of when to split or merge sub-bands to provide variable frequency segmentation.
摘要翻译：频率分割对于编码光谱数据的质量很重要。分段涉及将频谱数据分解成称为子带或向量的单元。均匀分割可能不是最佳的。描述了各种特征，用于提供频谱数据强度相关分割。为更大的频谱方差的区域提供更精细的分割，为更均匀的区域提供较粗的分割。具有相似特性的子带可以对质量影响很小，而如果子带被分割，则可以更好地表示具有高度可变数据的子带。描述了用于测量子带的音调，能量或形状的各种方法。根据决定何时拆分或合并子带以提供可变频率分段来讨论这些各种测量。

40. 发明申请

US20070016405A1 Coding with improved time resolution for selected segments via adaptive block transformation of a group of samples from a subband decomposition 有权
标题翻译：通过对来自子带分解的一组样本的自适应块变换，对所选择的片段进行编码
公开(公告)号：US20070016405A1
公开(公告)日：2007-01-18
申请号：US11183271
申请日：2005-07-15
申请人： Sanjeev Mehrotra , Wei-Ge Chen , Henrique Malvar
发明人： Sanjeev Mehrotra , Wei-Ge Chen , Henrique Malvar
IPC分类号： G10L21/00
CPC分类号： G10L19/0212 , G10L19/025
摘要： A transform coder is described that performs a time-split transform in addition to a discrete cosine type transform. A time-split transform is selectively performed based on characteristics of media data. Transient detection identifies a changing signal characteristic, such as a transient in media data. After encoding an input signal from a time domain to a transform domain, a time-splitting transformer selectively perform an orthogonal sum-difference transform on adjacent coefficients indicated by a changing signal characteristic location. The orthogonal sum-difference transform on adjacent coefficients results in transforming a vector of coefficients in the transform domain as if they were multiplied by an identity matrix including at least one 2×2 time-split block along a diagonal of the matrix. A decoder performs an inverse of the described transforms.
摘要翻译：描述了除了离散余弦变换之外还执行时间分割变换的变换编码器。基于媒体数据的特性选择性地执行时分解变换。瞬态检测识别变化的信号特性，例如媒体数据中的瞬态。在从时域到变换域的输入信号编码之后，时分解变换器选择性地对由变化信号特征位置指示的相邻系数进行正交和差变换。对相邻系数的正交和差变换导致变换域中的系数向量，如同它们乘以包括沿矩阵的对角线的至少一个2×2时间分割块的单位矩阵一样。解码器执行所描述的变换的逆。

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