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1. 发明授权

US06253185B1 Multiple description transform coding of audio using optimal transforms of arbitrary dimension 有权
标题翻译：使用任意维度的最优变换对音频进行多重变换编码
公开(公告)号：US06253185B1
公开(公告)日：2001-06-26
申请号：US09190908
申请日：1998-11-12
申请人： Ramon Arean , Vivek K. Goyal , Jelena Kovacevic
发明人： Ramon Arean , Vivek K. Goyal , Jelena Kovacevic
IPC分类号： G01L1900
CPC分类号： H04S1/00
摘要： A multiple description (MD) joint source-channel (JSC) encoder in accordance with the invention encodes n components of an audio signal for transmission over m channels of a communication medium, where n and m may take on any desired values. In an illustrative embodiment, the encoder combines a multiple description transform coder with elements of a perceptual audio coder (PAC). The encoder is configured to select one or more transform parameters for a multiple description transform, based on a characteristic of the audio signal to be encoded. For example, the transform parameters may be selected such that the resulting transformed coefficients have a variance distribution of a type expected by a subsequent entropy coding operation. The components of the audio signal may be quantized coefficients separated into a number of factor bands, and the transform parameter for a given factor band may be set to a value determined based on a transform parameter from at least one other factor band, e.g., the previous factor band. As another example, the transform parameter for one or more of the factor bands may be selected based on a determination as to whether the audio signal to be encoded is of a particular predetermined type. A desired variance distribution may also be obtained for the transformed coefficients by, e.g., pairing or otherwise grouping coefficients such that the coefficients of each pair or group are required to be in the same factor band.
摘要翻译：根据本发明的多描述（MD）联合源信道（JSC）编码器编码音频信号的n个分量，用于在通信介质的m个信道上进行传输，其中n和m可以采用任何期望的值。在说明性实施例中，编码器将多重描述变换编码器与感知音频编码器（PAC）的元件组合。编码器被配置为基于要编码的音频信号的特性来选择用于多描述变换的一个或多个变换参数。例如，可以选择变换参数，使得所得到的经变换的系数具有由后续熵编码操作所期望的类型的方差分布。音频信号的分量可以是分离成多个因子频带的量化系数，并且给定因子频带的变换参数可以被设置为基于来自至少一个其他因子频带的变换参数确定的值，例如，以前的因子带。作为另一示例，可以基于关于要编码的音频信号是否是特定预定类型的确定来选择一个或多个因子频带的变换参数。也可以通过例如配对或以其他方式对系数进行分组来获得变换系数的期望方差分布，使得每对或组的系数被要求处于相同的因子带中。

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