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51. 发明授权

US07240001B2 Quality improvement techniques in an audio encoder 有权
标题翻译：音频编码器中的质量改进技术
公开(公告)号：US07240001B2
公开(公告)日：2007-07-03
申请号：US10016918
申请日：2001-12-14
申请人： Wei-Ge Chen , Naveen Thumpudi , Ming-Chieh Lee
发明人： Wei-Ge Chen , Naveen Thumpudi , Ming-Chieh Lee
IPC分类号： G10L19/00 , G04B1/66
CPC分类号： G10L19/008 , G10L19/002 , G10L19/02
摘要： An audio encoder implements multi-channel coding decision, band truncation, multi-channel rematrixing, and header reduction techniques to improve quality and coding efficiency. In the multi-channel coding decision technique, the audio encoder dynamically selects between joint and independent coding of a multi-channel audio signal via an open-loop decision based upon (a) energy separation between the coding channels, and (b) the disparity between excitation patterns of the separate input channels. In the band truncation technique, the audio encoder performs open-loop band truncation at a cut-off frequency based on a target perceptual quality measure. In multi-channel rematrixing technique, the audio encoder suppresses certain coefficients of a difference channel by scaling according to a scale factor, which is based on current average levels of perceptual quality, current rate control buffer fullness, coding mode, and the amount of channel separation in the source. In the header reduction technique, the audio encoder selectively modifies the quantization step size of zeroed quantization bands so as to encode in fewer frame header bits.
摘要翻译：音频编码器实现多信道编码决策，频带截断，多信道重叠矩阵和头缩减技术，以提高质量和编码效率。在多信道编码决策技术中，音频编码器通过基于（a）编码信道之间的能量分离的开环决策，动态地在多声道音频信号的联合和独立编码之间进行选择，和（b）视差在单独的输入通道的激励模式之间。在频带截断技术中，音频编码器基于目标感知质量测量，以截止频率执行开环频带截断。在多声道再现矩阵技术中，音频编码器根据当前平均感知质量水平，当前速率控制缓冲器充满度，编码模式和频道数量的比例因子按比例缩放差分信道的某些系数。在源头分离。在标题缩小技术中，音频编码器有选择地修改置零的量化频带的量化步长，以便以更少的帧头位编码。

52. 发明授权

US07143030B2 Parametric compression/decompression modes for quantization matrices for digital audio 有权
标题翻译：用于数字音频的量化矩阵的参数压缩/解压缩模式
公开(公告)号：US07143030B2
公开(公告)日：2006-11-28
申请号：US11061011
申请日：2005-02-17
申请人： Wei-Ge Chen , Ming-Chieh Lee , Naveen Thumpudi
发明人： Wei-Ge Chen , Ming-Chieh Lee , Naveen Thumpudi
IPC分类号： G10L19/04
CPC分类号： G10L19/008 , G10L19/02 , G10L19/0204
摘要： Quantization matrices facilitate digital audio encoding and decoding. An audio encoder generates and compresses quantization matrices; an audio decoder decompresses and applies the quantization matrices. For example, the audio encoder generates a quantization matrix including weighting factors and processes a set of weighting factors according to a parametric model to switch between a direct representation and a parametric representation of the set of weighting factors, where the parametric representation of the set of weighting factors accounts for audibility of distortion according to a model of human auditory perception. In another example, an audio encoder receives a band weight representation of a ciuantization matrix and compresses the band weight representation of the quantization matrix using linear predictive coding, wherein the compressing includes computing pseudo-autocorrelation values for the quantization matrix. For example, a matrix includes weights for bands of a group of frequency coefficients.
摘要翻译：量化矩阵便于数字音频编码和解码。音频编码器生成并压缩量化矩阵; 音频解码器解压缩并应用量化矩阵。例如，音频编码器生成包括加权因子的量化矩阵，并根据参数模型处理一组加权因子，以在一组加权因子的直接表示和参数表示之间切换，其中该组的参数表示加权因子根据人类听觉感知模型考虑到失真的可听性。在另一示例中，音频编码器接收一个矩阵矩阵的带权重表示，并使用线性预测编码压缩量化矩阵的带权重表示，其中压缩包括计算量化矩阵的伪自相关值。例如，矩阵包括一组频率系数的频带的权重。

53. 发明申请

US20050177367A1 Quality and rate control strategy for digital audio 有权
标题翻译：数字音频质量和速率控制策略
公开(公告)号：US20050177367A1
公开(公告)日：2005-08-11
申请号：US11066859
申请日：2005-02-24
申请人： Wei-Ge Chen , Naveen Thumpudi , Ming-Chieh Lee
发明人： Wei-Ge Chen , Naveen Thumpudi , Ming-Chieh Lee
IPC分类号： G10L19/002 , G10L19/24 , G10L19/00
CPC分类号： G10L19/24 , G10L19/002
摘要： An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and maximum bit count parameters. Second, an encoder regulates quantization using a noise measure that indicates reliability of a complexity measure. Third, an encoder normalizes a control parameter value according to block size for a variable-size block. Fourth, an encoder uses a bit-count control loop de-linked from a quality control loop. Fifth, an encoder addresses non-monotonicity of quality measurement as a function of quantization level when selecting a quantization level. Sixth, an encoder uses particular interpolation rules to find a quantization level In a quality or bit-count control loop. Seventh, an encoder filters a control parameter value to smooth quality. Eighth, an encoder corrects model bias by adjusting a control parameter value in view of current buffer fullness.
摘要翻译：音频编码器通过控制策略来调节质量和比特率。该策略包括几个功能。首先，编码器使用质量，最小位计数和最大位计数参数来调节量化。第二，编码器使用指示复杂性度量的可靠性的噪声测量来调节量化。第三，编码器根据可变大小块的块大小对控制参数值进行归一化。第四，编码器使用从质量控制环路去链接的位计数控制环路。第五，当选择量化级别时，编码器将质量测量的非单调性作为量化级别的函数。第六，编码器使用特定的插值规则来在质量或位计数控制环路中找到量化级别。第七，编码器过滤控制参数值以平滑质量。第八，编码器通过根据当前缓冲区饱和度调整控制参数值来校正模型偏差。

54. 发明申请

US20050159947A1 Quantization matrices for digital audio 有权
公开(公告)号：US20050159947A1
公开(公告)日：2005-07-21
申请号：US11060936
申请日：2005-02-17
申请人： Wei-Ge Chen , Naveen Thumpudi , Ming-Chieh Lee
发明人： Wei-Ge Chen , Naveen Thumpudi , Ming-Chieh Lee
IPC分类号： G10L19/008 , G10L19/02
CPC分类号： G10L19/008 , G10L19/02 , G10L19/0204
摘要： Quantization matrices facilitate digital audio encoding and decoding. An audio encoder generates and compresses quantization matrices; an audio decoder decompresses and applies the quantization matrices. The invention includes several techniques and tools, which can be used in combination or separately. For example, the audio encoder can generate quantization matrices from critical band patterns for blocks of audio data. The encoder can compute the quantization matrices directly from the critical band patterns, which can be computed from the same audio data that is being compressed. The audio encoder/decoder can use different modes for generating/applying quantization matrices depending on the coding channel mode of multi-channel audio data. The audio encoder/decoder can use different compression/decompression modes for the quantization matrices, including a parametric compression/decompression mode.

55. 发明申请

US20050159946A1 Quality and rate control strategy for digital audio 有权
标题翻译：数字音频质量和速率控制策略
公开(公告)号：US20050159946A1
公开(公告)日：2005-07-21
申请号：US11066860
申请日：2005-02-24
申请人： Wei-Ge Chen , Naveen Thumpudi , Ming-Chieh Lee
发明人： Wei-Ge Chen , Naveen Thumpudi , Ming-Chieh Lee
IPC分类号： G10L19/002 , G10L19/24 , G10L19/02
CPC分类号： G10L19/24 , G10L19/002
摘要： An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and maximum bit count parameters. Second, an encoder regulates quantization using a noise measure that indicates reliability of a complexity measure. Third, an encoder normalizes a control parameter value according to block size for a variable-size block. Fourth, an encoder uses a bit-count control loop de-linked from a quality control loop. Fifth, an encoder addresses non-monotonicity of quality measurement as a function of quantization level when selecting a quantization level. Sixth, an encoder uses particular interpolation rules to find a quantization level in a quality or bit-count control loop. Seventh, an encoder filters a control parameter value to smooth quality. Eighth, an encoder corrects model bias by adjusting a control parameter value in view of current buffer fullness.
摘要翻译：音频编码器通过控制策略来调节质量和比特率。该策略包括几个功能。首先，编码器使用质量，最小位计数和最大位计数参数来调节量化。第二，编码器使用指示复杂性度量的可靠性的噪声测量来调节量化。第三，编码器根据可变大小块的块大小对控制参数值进行归一化。第四，编码器使用从质量控制环路去链接的位计数控制环路。第五，当选择量化级别时，编码器将质量测量的非单调性作为量化级别的函数。第六，编码器使用特定的内插规则来在质量或位计数控制环路中找到量化级别。第七，编码器过滤控制参数值以平滑质量。第八，编码器通过根据当前缓冲区饱和度调整控制参数值来校正模型偏差。

56. 发明申请

US20050149323A1 Quantization matrices for digital audio 有权
公开(公告)号：US20050149323A1
公开(公告)日：2005-07-07
申请号：US11061011
申请日：2005-02-17
申请人： Wei-Ge Chen , Naveen Thumpudi , Ming-Chieh Lee
发明人： Wei-Ge Chen , Naveen Thumpudi , Ming-Chieh Lee
IPC分类号： G10L19/008 , G10L19/02 , G10L19/12
CPC分类号： G10L19/008 , G10L19/02 , G10L19/0204
摘要： Quantization matrices facilitate digital audio encoding and decoding. An audio encoder generates and compresses quantization matrices; an audio decoder decompresses and applies the quantization matrices. The invention includes several techniques and tools, which can be used in combination or separately. For example, the audio encoder can generate quantization matrices from critical band patterns for blocks of audio data. The encoder can compute the quantization matrices directly from the critical band patterns, which can be computed from the same audio data that is being compressed. The audio encoder/decoder can use different modes for generating/applying quantization matrices depending on the coding channel mode of multi-channel audio data. The audio encoder/decoder can use different compression/decompression modes for the quantization matrices, including a parametric compression/decompression mode.

57. 发明申请

US20050143990A1 Quality and rate control strategy for digital audio 有权
公开(公告)号：US20050143990A1
公开(公告)日：2005-06-30
申请号：US11066897
申请日：2005-02-24
申请人： Wei-Ge Chen , Naveen Thumpudi , Ming-Chieh Lee
发明人： Wei-Ge Chen , Naveen Thumpudi , Ming-Chieh Lee
IPC分类号： G10L19/002 , G10L19/24 , G10L19/00
CPC分类号： G10L19/24 , G10L19/002
摘要： An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and maximum bit count parameters. Second, an encoder regulates quantization using a noise measure that indicates reliability of a complexity measure. Third, an encoder normalizes a control parameter value according to block size for a variable-size block. Fourth, an encoder uses a bit-count control loop de-linked from a quality control loop. Fifth, an encoder addresses non-monotonicity of quality measurement as a function of quantization level when selecting a quantization level. Sixth, an encoder uses particular interpolation rules to find a quantization level in a quality or bit-count control loop. Seventh, an encoder filters a control parameter value to smooth quality. Eighth, an encoder corrects model bias by adjusting a control parameter value in view of current buffer fullness.

58. 发明申请

US20050015246A1 Multi-pass variable bitrate media encoding 有权
标题翻译：多通道可变比特率媒体编码
公开(公告)号：US20050015246A1
公开(公告)日：2005-01-20
申请号：US10623338
申请日：2003-07-18
申请人： Naveen Thumpudi , Wei-Ge Chen
发明人： Naveen Thumpudi , Wei-Ge Chen
IPC分类号： G10L19/02 , G10L19/14
CPC分类号： G10L19/24
摘要： An encoder uses multi-pass VBR control strategies to provide constant or relatively constant quality for VBR output while guaranteeing (within tolerance) either compressed file size or, equivalently, overall average bitrate. The control strategies include various techniques and tools, which can be used in combination or independently. For example, in a first pass, an audio encoder encodes a sequence of audio data partitioned into variable-size chunks. In a second pass, the encoder encodes the sequence according to control parameters to produce output of relatively constant quality. The encoder sets checkpoints in the second pass to adjust the control parameters and/or subsequent checkpoints. The encoder selectively considers a peak bitrate constraint to limit peak bitrate. The encoder stores auxiliary information from the first pass for use in the second pass, which increases the speed of the second pass. Finally, the encoder compares signatures for the input data to check consistency between passes.
摘要翻译：编码器使用多通VBR控制策略为VBR输出提供恒定或相对恒定的质量，同时保证（容差范围内）压缩文件大小或等效的总平均比特率。控制策略包括可以组合或独立使用的各种技术和工具。例如，在第一遍中，音频编码器对分割成可变大小的块的音频数据序列进行编码。在第二遍中，编码器根据控制参数编码序列以产生相对恒定质量的输出。编码器在第二遍中设置检查点以调整控制参数和/或后续检查点。编码器选择性地考虑峰值比特率约束来限制峰值比特率。编码器存储从第一遍的辅助信息用于第二遍，这增加了第二遍的速度。最后，编码器对输入数据的签名进行比较，以检查通过之间的一致性。

59. 发明授权

US08255234B2 Quantization and inverse quantization for audio 有权
标题翻译：音频的量化和反量化
公开(公告)号：US08255234B2
公开(公告)日：2012-08-28
申请号：US13276163
申请日：2011-10-18
申请人： Naveen Thumpudi , Wei-Ge Chen
发明人： Naveen Thumpudi , Wei-Ge Chen
IPC分类号： G10L19/00 , G10L21/00 , G10L21/04 , G10L19/02
CPC分类号： G10L19/032 , G10L19/008
摘要： An audio encoder and decoder use architectures and techniques that improve the efficiency of quantization (e.g., weighting) and inverse quantization (e.g., inverse weighting) in audio coding and decoding. The described strategies include various techniques and tools, which can be used in combination or independently. For example, an audio encoder quantizes audio data in multiple channels, applying multiple channel-specific quantizer step modifiers, which give the encoder more control over balancing reconstruction quality between channels. The encoder also applies multiple quantization matrices and varies the resolution of the quantization matrices, which allows the encoder to use more resolution if overall quality is good and use less resolution if overall quality is poor. Finally, the encoder compresses one or more quantization matrices using temporal prediction to reduce the bitrate associated with the quantization matrices. An audio decoder performs corresponding inverse processing and decoding.
摘要翻译：音频编码器和解码器使用在音频编码和解码中提高量化（例如，加权）和逆量化（例如，反加权）的效率的架构和技术。所描述的策略包括可以组合或独立使用的各种技术和工具。例如，音频编码器对多个信道中的音频数据进行量化，应用多个信道专用量化器步进修改器，这使得编码器更多地控制平衡信道之间的重建质量。编码器还应用多个量化矩阵并改变量化矩阵的分辨率，这允许编码器在整体质量好的情况下使用更高的分辨率，并且如果整体质量差，则使用较小的分辨率。最后，编码器使用时间预测来压缩一个或多个量化矩阵，以减少与量化矩阵相关联的比特率。音频解码器执行相应的反向处理和解码。

60. 发明授权

US08099292B2 Multi-channel audio encoding and decoding 有权
公开(公告)号：US08099292B2
公开(公告)日：2012-01-17
申请号：US12944604
申请日：2010-11-11
申请人： Naveen Thumpudi , Wei-Ge Chen
发明人： Naveen Thumpudi , Wei-Ge Chen
IPC分类号： G10L19/00 , G10L21/00 , G10L21/04
CPC分类号： G10L19/00 , G10L19/008 , G10L19/0212
摘要： An audio encoder and decoder use architectures and techniques that improve the efficiency of multi-channel audio coding and decoding. The described strategies include various techniques and tools, which can be used in combination or independently. For example, an audio encoder performs a pre-processing multi-channel transform on multi-channel audio data, varying the transform so as to control quality. The encoder groups multiple windows from different channels into one or more tiles and outputs tile configuration information, which allows the encoder to isolate transients that appear in a particular channel with small windows, but use large windows in other channels. Using a variety of techniques, the encoder performs flexible multi-channel transforms that effectively take advantage of inter-channel correlation. An audio decoder performs corresponding processing and decoding. In addition, the decoder performs a post-processing multi-channel transform for any of multiple different purposes.

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