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Introduction to FIR Filters

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Published on Oct 10, 2012

A brief introduction to how Finite Impulse Response (FIR) filters work for digital signal processing. FIR filters are commonly used in, e.g., digital down-conversion applications to filter an incoming signal before down-sampling it. FIR filters are relatively straight-forward to implement on a variety of digital processing platforms, and are most easily understood as a convolution in time domain, corresponding to a multiplication in frequency domain by the corresponding filter response.

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