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On Wikipedia, the usage is "filter bank" exclusively.

A search on Google Scholar returns essentially the same number of both spellings.

This is for a scientific document about digital signal processing, so I want to know which is correct.

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A Google Ngram showed that filter bank is used more widely:

http://ngrams.googlelabs.com/chart?content=filterbank%2Cfilter%20bank&corpus=0&smoothing=3&year_start=1990&year_end=2008

Because of this, I recommend using filter bank.

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  • Thanks, I didn't know about the Ngrams. They will probably be useful again someday.
    – Alexandre Chabot
    Commented Aug 12, 2011 at 9:52
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Wiktionary gives "filterbank" as an alternative of "filter bank". Personally, the correct spelling is "filter bank" (with a space inbetween) because that's the original.

The only searches on Google that rendered "filterbank" was the name of a product, so I would advise you to use "filter bank" for your paper.

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