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US08612240B2 Audio encoder, audio decoder, method for encoding an audio information, method for decoding an audio information and computer program using a region-dependent arithmetic coding mapping rule 有权
音频编码器，音频解码器，用于对音频信息进行编码的方法，使用区域依赖的算术编码映射规则解码音频信息的方法和计算机程序

Audio encoder, audio decoder, method for encoding an audio information, method for decoding an audio information and computer program using a region-dependent arithmetic coding mapping rule
摘要：
An audio decoder for providing a decoded audio information includes an arithmetic decoder for providing a plurality of decoded spectral values on the basis of an arithmetically-encoded representation of the spectral values and a frequency-domain-to-time-domain converter for providing a time-domain audio representation using decoded spectral values. The arithmetic decoder is configured to select a mapping rule describing a mapping of a code value onto a symbol code in dependence on a context state. The arithmetic decoder is configured to determine a numeric current context value describing the current context state in dependence on a plurality of previously decoded spectral values and also in dependence on whether a spectral value to be decoded is in a first predetermined frequency region or in a second predetermined frequency region. An audio encoder provides an encoded audio information on the basis of an input audio information.
摘要（中）：

用于提供解码音频信息的音频解码器包括算术解码器，用于根据频谱值的算术编码表示提供多个解码频谱值，以及频域 - 时域转换器，用于提供时间 - 使用解码频谱值的域音频表示。 算术解码器被配置为根据上下文状态选择描述代码值到符号代码上的映射规则的映射规则。 算术解码器被配置为根据多个先前解码的频谱值来确定描述当前上下文状态的数字当前上下文值，并且还根据要解码的频谱值是否处于第一预定频率区域或者在第二预定频率区域中 预定频率区域。 音频编码器基于输入的音频信息提供经编码的音频信息。

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