请教一个句型

Thus,the noise-shaped output signal is a low-precision,oversampled signal having a
noise power spectrum with quantization noise shifted to a high frequency range.
请问该句中行使shift的主体是谁，noise power spectrum 还是quantization
noise ，该怎样翻译？

应该是修饰“噪声功率谱”：  

   因此，该噪声抑制输出信号为一低精确度的[经]过采样[处理的]信号，该信号具有一偏移至高频范围的带有量化噪声的噪声功率谱。

a low-precision,oversampled signal (having a
noise power spectrum (with quantization noise (shifted to a high frequency range)))

Thus,the noise-shaped output signal is a low-precision,oversampled signal having a noise power spectrum with quantization noise shifted to a high frequency range.

不懂专业情况下试翻译：

因此，noise-shaped output signal是low-precision,oversampled signal，其noise power spectrum中quantization noise 偏移至high frequency range。