Digital Adaptive Spectral Filtering
RENSSELAER POLYTECHNIC INST TROY NY SYSTEMS ENGINEERING DIV
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An adaptive procedure for removing a multimodal power spectrum using cascaded transversal digital filters is described. Each section of the overall filter consists of a second order transversal filter whose zero pair is adaptively adjusted to remove one of the modes of the undesired spectrum. The paper is divided into two sections. The paper first treats the case of an unknown but unimodal power spectrum. The second section treats the case where the power spectrum is multimodal, specifically the dual mode case. For this case a gradient approach was used to adaptively adjust the zero pairs of the digital filter to remove the unwanted spectrum. A set of simulation results are presented for various combinations of modal separation and relative power between modes.
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