说明：  广义加权相关时延估计(GCC):主要是提高了信噪比。相关函数和功率谱密度函数是一对傅里叶变换对,在频域利用不同 TDE 进行时延估计。
(Generalized Weighted Correlation Delay Estimation (GCC): It mainly improves the signal-to-noise ratio. The correlation function and the power spectral density function are a pair of Fourier transform, which use different TDE to estimate the time delay in the frequency domain.)