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Frequency domain processing, where the inputs were a single axially gated section of channel data. Each channel was transformed into the frequency domain using the discrete Fourier transform (DFT). DNNs specific to each DFT frequency and trained to suppress off-axis scattering removed clutter. The data was transformed back into the time domain using an inverse discrete Fourier transform (IDFT). Note that the IDFT and summation operations could be interchanged.
