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CN105981410B 使用奇异值分解进行高阶高保真立体声编码和解码的方法和装置 有权

使用奇异值分解进行高阶高保真立体声编码和解码的方法和装置
摘要：
使用奇异值分解来对HOA信号进行编码和解码包括：基于声源方向值和高保真立体声阶次，形成(11)对应的球谐右矢量(|Y(Ωs)>)和编码器模式矩阵(ΞOxS)。根据音频输入信号(|x(Ωs)>)，确定奇异阈值(σε)。对编码器模式矩阵执行奇异值分解(13)，以便得到与所述阈值比较的相关奇异值，导致最终的编码器模式矩阵秩基于扬声器的方向值(Ωl)和解码器高保真立体声阶次(Nl)，形成(18)对应的右矢量(|Y(Ωl)>)以及解码器模式矩阵(ΨOxL)。对解码器模式矩阵执行奇异值分解(19)，以提供最终的解码器模式矩阵秩根据最终的编码器模式矩阵秩和最终的解码器模式矩阵秩，确定最终的模式矩阵秩(rfin)，并且根据最终的模式矩阵秩以及编码器侧的奇异值分解，计算编码器模式矩阵(ΞOxS)的伴随伪逆和高保真立体声右矢量(|a′s>)。根据所述最终的模式矩阵秩(rfin)减少(16)高保真立体声右矢量(|a′s>)的分量的数量，以便提供改动的高保真立体声右矢量(|a′l>)。根据改动的高保真右矢量、解码器侧的奇异值分解的输出值和所述最终的模式矩阵秩计算(15)伴随解码器模式矩阵(Ψ+)，得到所有扬声器的输出信号的右矢量(|y(Ωl)>)。
摘要（英）：

The encoding and decoding of HOA signals using Singular Value Decomposition includes forming (11) based on sound source direction values and an Ambisonics order corresponding ket vectors (| Y (© s )Œª) of spherical harmonics and an encoder mode matrix (ž O x S ). From the audio input signal (| x (© s )Œª) a singular threshold value ( à µ ) determined. On the encoder mode matrix a Singular Value Decomposition (13) is carried out in order to get related singular values which are compared with the threshold value, leading to a final encoder rank ( r fin e ) . Based on direction values (© l ) of loudspeakers and a decoder Ambisonics order ( N l ), corresponding ket vectors (|Y(© l )Œª) and a decoder mode matrix (¨ O x L ) are formed (18). On the decoder mode matrix a Singular Value Decomposition (19) is carried out, providing a final decoder rank ( r fin d ). From the final encoder and decoder ranks a final rank is determined, and from this final rank and the encoder side Singular Value Decomposition an adjoint pseudo inverse (ž + ) € of the encoder mode matrix (ž O x S ) and an Ambisonics ket vector (|a' s Œª) are calculated. The number of components of the Ambisonics ket vector is reduced (16) according to the final rank so as to provide an adapted Ambisonics ket vector (|a' l Œª). From the adapted Ambisonics ket vector, the output values of the decoder side Singular Value Decomposition and the final rank an adjoint decoder mode matrix (¨) € is calculated (15), resulting in a ket vector (| y (© l )Œª) of output signals for all loudspeakers.

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