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近年来自适应滤波器已被用于信号处理。自适应滤波器与傅里叶变换组合在一起可以用来进行信号检测。把时域自适应滤波器的权进行傅里叶变换后可以做出信号和噪声的谱特性的估计。图1就是一个自适应线增强器与DFT联用的结构框图。同样这样的谱估值问题也可以在频域中进行。图2给出一个频域自适应滤波器的示意图。
In recent years, adaptive filters have been used for signal processing. The combination of adaptive filters and Fourier transforms can be used for signal detection. The Fourier transform of the weights of the time-domain adaptive filters allows the estimation of the spectral properties of the signal and noise. Figure 1 is an adaptive line enhancer and DFT block diagram. The same problem of spectral estimation can also be done in the frequency domain. Figure 2 shows a schematic of a frequency domain adaptive filter.