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doc/filters: fix afftfilt example
Signed-off-by: Paul B Mahol <onemda@gmail.com>
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@ -804,9 +804,9 @@ window function will be picked. Default is @code{0.75}.
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@itemize
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@itemize
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@item
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@item
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Increase first 50 bins by 0.1 and lower all other frequencies by factor of 10:
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Leave almost only low frequencies in audio:
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@example
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@example
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afftfilt="1.1*between(b\,0\,49)+0.1*between(b\,50\,f)"
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afftfilt="1-clip((b/nb)*b,0,1)"
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@end example
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@end example
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@end itemize
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@end itemize
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