▁defined ▁as ▁▁ ▁also ▁known ▁as ▁a ▁s inc ▁window , ▁because : ▁ ▁is ▁the ▁main ▁lo be ▁of ▁a ▁normal ized ▁s inc ▁function ▁ ▁Com parison ▁of ▁windows ▁▁ ▁When ▁selecting ▁an ▁appropriate ▁window ▁function ▁for ▁an ▁application , ▁this ▁comparison ▁graph ▁may ▁be ▁useful . ▁The ▁frequency ▁axis ▁has ▁units ▁of ▁F FT ▁" b ins " ▁when ▁the ▁window ▁of ▁length ▁N ▁is ▁applied ▁to ▁data ▁and ▁a ▁transform ▁of ▁length ▁N ▁is ▁computed . ▁ ▁For ▁instance , ▁the ▁value ▁at ▁frequency ▁ ½ ▁" bin " ▁( third ▁tick ▁mark ) ▁is ▁the ▁response ▁that ▁would ▁be ▁measured ▁in ▁b ins ▁k ▁and ▁k + 1 ▁to ▁a ▁sin us oid al ▁signal ▁at ▁frequency ▁k + ½ . ▁ ▁It ▁is ▁relative ▁to ▁the ▁maximum ▁possible ▁response , ▁which ▁occurs ▁when ▁the ▁signal ▁frequency ▁is ▁an ▁integer ▁number ▁of ▁b ins . ▁ ▁The ▁value ▁at ▁frequency ▁ ½ ▁is ▁referred ▁to ▁as ▁the ▁maximum ▁scal lop ing ▁loss ▁of ▁the ▁window , ▁which ▁is ▁one ▁metric ▁used ▁to ▁compare ▁windows . ▁ ▁The ▁rect angular ▁window ▁is ▁notice ably ▁worse ▁than ▁the ▁others ▁in ▁terms ▁of ▁that ▁metric . ▁ ▁Other ▁metrics ▁that ▁can ▁be ▁seen ▁are ▁the ▁width ▁of ▁the ▁main ▁lo be ▁and ▁the ▁peak ▁level ▁of ▁the ▁s idel ob es , ▁which ▁respectively ▁determine ▁the ▁ability ▁to ▁resolve ▁compar able ▁strength ▁signals ▁and ▁dispar ate ▁strength ▁signals . ▁ ▁The ▁rect angular ▁window ▁( for ▁instance ) ▁is ▁the ▁best