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Extra information for the inquisative: Blackman/Hanning (and a slew of others) are general purpose frequency seperation methods that can be aplied to a variety of different situations, they are also used, for example in audio processing to remove, reduce or enhance certain frequency ranges. Infact most "tap" based interpolators are really all based on the same methadology, the implementation is the interesting part. In audio processing such algorithms are called "finite impulse response" filters, or lowpass/highpass/bandlimiting filters, whereas in video they are usually just reffered to as interpolators, since their other functions are infrequently directly used in video applications.
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