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Quadrature encoder - Most efficient software implementation

This is a decoder I wrote years back, and have used successfully in many personal and commercial applications. It is designed to efficiently decode anywhere between 1 and 16 encoder inputs in parallel,...
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How to calculate the cut-off frequency of a software average filter

It sounds like you are doing straight up accumulate-and-dump, which is a downsampled moving average, which is a finite-impulse response (FIR) filter with equal tap weights. Some people call it a ...
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