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I am not sure about your wikipedia reference. In the one I just retrieved, they say: In digital signal processing, upsampling, expansion, and interpolation are terms associated with the process of resampling in a multi-rate digital signal processing system. Upsampling can be synonymous with expansion, or it can describe an entire process of expansion and ...


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Within the context of Digital Signal Processing... Upsampling and interpolation are synonyms, expander is not. Specifically, an upsampler and an interpolator include an expander followed by an anti-imaging lowpass filter. The expander, is the initial stage of an interpolator or an upsampler. The following is an expander: $$x[n] \longrightarrow \boxed{ \...


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Zero-order hold and nearest-neighbor interpolation are conceptually the same thing; when extending the original dataset to cover new data points, you are just picking a value in the same area of the signal to use as the interpolant, instead of something more sophisticated. The main difference I could see between the two is that zero-order hold is usually ...


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