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首页> 外国专利> AUDIO ENCODER, AUDIO DECODER, METHOD FOR ENCODING AN AUDIO INFORMATION, METHOD FOR DECODING AN AUDIO INFORMATION AND COMPUTER PROGRAM USING AN ITERATIVE INTERVAL SIZE REDUCTION

AUDIO ENCODER, AUDIO DECODER, METHOD FOR ENCODING AN AUDIO INFORMATION, METHOD FOR DECODING AN AUDIO INFORMATION AND COMPUTER PROGRAM USING AN ITERATIVE INTERVAL SIZE REDUCTION

机译：音频编码器，音频解码器，用于编码音频信息的方法，用于编码音频信息的方法和使用迭代间隔减小的计算机程序

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摘要

An audio decoder for providing a decoded audio information includes a 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 the 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 or modify the current context state in dependence on a plurality of previously-decoded spectral values. The arithmetic decoder is configured to detect a group of a plurality of previously-decoded spectral values, which fulfill, individually or taken together, a predetermined condition regarding their magnitudes, and to determine the current context state in dependence on a result of the detection. An audio encoder uses similar principles.
机译：用于提供解码的音频信息的音频解码器包括：用于基于频谱值的算术编码表示来提供多个解码的频谱值的算术解码器;以及用于提供时间的频域到时域转换器。使用解码后的频谱值进行域音频表示。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的映射的映射规则。算术解码器被配置为根据多个先前解码的频谱值来确定或修改当前上下文状态。算术解码器被配置为检测多个先前解码的频谱值的组，其单独地或一起满足关于其幅度的预定条件，并根据检测结果确定当前上下文状态。音频编码器使用类似的原理。

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