公开(公告)号：US07277848B2

公开(公告)日：2007-10-02

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： G10L21/02

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。

公开(公告)号：US20070061138A1

公开(公告)日：2007-03-15

申请号：US11599686

申请日：2006-11-14

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

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。

公开(公告)号：US07146313B2

公开(公告)日：2006-12-05

申请号：US10017861

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： G01L19/00

CPC分类号： G10L25/69

摘要： An audio processing tool measures the quality of reconstructed audio data. For example, an audio encoder measures the quality of a block of reconstructed frequency coefficient data in a quantization loop. The invention includes several techniques and tools, which can be used in combination or separately. First, before measuring quality, the tool normalizes the block to account for variation in block sizes. Second, for the quality measurement, the tool processes the reconstructed data by critical bands, which can differ from the quantization bands used to compress the data. Third, the tool accounts for the masking effect of the reconstructed data, not just the masking effect of the original data. Fourth, the tool band weights the quality measurement, which can be used to account for noise substitution or band truncation. Finally, the tool changes quality measurement techniques depending on the channel coding mode.

公开(公告)号：US20060241942A1

公开(公告)日：2006-10-26

申请号：US11475302

申请日：2006-06-26

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

CPC分类号： G10L25/69

摘要： An audio processing tool measures the quality of reconstructed audio data. For example, an audio encoder measures the quality of a block of reconstructed frequency coefficient data in a quantization loop. The invention includes several techniques and tools, which can be used in combination or separately. First, before measuring quality, the tool normalizes the block to account for variation in block sizes. Second, for the quality measurement, the tool processes the reconstructed data by critical bands, which can differ from the quantization bands used to compress the data. Third, the tool accounts for the masking effect of the reconstructed data, not just the masking effect of the original data. Fourth, the tool band weights the quality measurement, which can be used to account for noise substitution or band truncation. Finally, the tool changes quality measurement techniques depending on the channel coding mode.

公开(公告)号：US20060241796A1

公开(公告)日：2006-10-26

申请号：US11114873

申请日：2005-04-25

申请人： Christopher Messer ,  Naveen Thumpudi ,  Raymond Cheng ,  Serge Smirnov ,  Wei-ge Chen ,  Timothy Onders

发明人： Christopher Messer ,  Naveen Thumpudi ,  Raymond Cheng ,  Serge Smirnov ,  Wei-ge Chen ,  Timothy Onders

IPC分类号： G06F17/00

CPC分类号： G10L19/167 ,  H04N21/2368 ,  H04N21/4341 ,  H04N21/439

摘要： A compressed digital audio signal is transmitted from an audio source along a connection wire to an audio receiver. The digital audio signal can encode digital audio data having different sampling frequencies, frames sizes, and other information. The audio receiver that receives the digital audio signal can decode and convert the compressed digital audio signal into multiple synchronized analog signals, which are used to drive multiple speakers. The audio receiver may also synchronize the audio data with associated video data so that the audio playback and video playback are “in sync”, despite delay introduced by the audio signal decoding at the audio receiver.

摘要翻译： 压缩的数字音频信号从音频源沿着连接线传输到音频接收器。 数字音频信号可以编码具有不同采样频率，帧大小和其他信息的数字音频数据。 接收数字音频信号的音频接收器可以将压缩的数字音频信号解码并转换成多个同步的模拟信号，用于驱动多个扬声器。 音频接收器还可以使音频数据与相关联的视频数据同步，使音频播放和视频播放“尽管同步”，尽管由音频接收器处的音频信号解码引入了延迟。

公开(公告)号：US20050149324A1

公开(公告)日：2005-07-07

申请号：US11061012

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.

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。 本发明包括可以组合或分开使用的几种技术和工具。 例如，音频编码器可以生成用于音频数据块的临界频带模式的量化矩阵。 编码器可以直接从临界频带模式计算量化矩阵，这可以从正被压缩的相同音频数据计算。 音频编码器/解码器可以根据多声道音频数据的编码信道模式使用不同的模式来产生/应用量化矩阵。 音频编码器/解码器可以对量化矩阵使用不同的压缩/解压缩模式，包括参数压缩/解压缩模式。

公开(公告)号：US20050143993A1

公开(公告)日：2005-06-30

申请号：US11067170

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.

公开(公告)号：US20050143991A1

公开(公告)日：2005-06-30

申请号：US11066898

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.

公开(公告)号：US08386269B2

公开(公告)日：2013-02-26

申请号：US13327138

申请日：2011-12-15

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.

公开(公告)号：US20120082316A1

公开(公告)日：2012-04-05

申请号：US13326315

申请日：2011-12-14

申请人： Naveen Thumpudi ,  Wei-Ge Chen

发明人： Naveen Thumpudi ,  Wei-Ge Chen

IPC分类号： H04R5/00

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.