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CN105723455B 用于编码音频信号的编码器、音频发送系统和用于确定校正值的方法 有权

用于编码音频信号的编码器、音频发送系统和用于确定校正值的方法
摘要：
一种用于编码音频信号的编码器包括：分析器，被配置为分析所述音频信号，以及用于根据所述音频信号确定分析预测系数。编码器还包括：变换器，被配置为根据所述分析预测系数推导已变换预测系数；存储器，被配置为存储一定数量的校正值；以及计算器。计算器包括：处理器，被配置为处理所述已变换预测系数，以获得频谱加权因子。计算器还包括：组合器，被配置为将所述频谱加权因子与所述数量的校正值进行组合，以获得已校正加权因子。计算器的量化器被配置为使用所述已校正加权因子量化所述已变换预测系数，以获得所述已变换预测系数的量化表示。编码器包括：比特流形成器，被配置为基于所述已变换预测系数的量化表示并基于所述音频信号来形成输出信号。
摘要（英）：

An encoder for encoding an audio signal comprises an analyzer configured for analyzing the audio signal and for determining analysis prediction coefficients from the audio signal. The encoder further comprises a converter configured for deriving converted prediction coefficients from the analysis prediction coefficients, a memory configured for storing a multitude of correction values and a calculator. The calculator comprises a processor configured for processing the converted prediction coefficients to obtain spectral weighting factors. The calculator further comprises a combiner configured for combining the spectral weighting factors and the multitude of correction values to obtain corrected weighting factors. A quantizer of the calculator is configured for quantizing the converted prediction coefficients using the corrected weighting factors to obtain a quantized representation of the converted prediction coefficients. The encoder comprises a bitstream former configured for forming an output signal based on the quantized representation of the converted prediction coefficients and based on the audio signal.

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