▁ 3 ▁shows ▁a ▁D T FT ▁for ▁a ▁rect angular ly - window ed ▁sin us oid . ▁The ▁actual ▁frequency ▁of ▁the ▁sin us oid ▁is ▁indicated ▁as ▁" 1 3 " ▁on ▁the ▁horizontal ▁axis . ▁Everything ▁else ▁is ▁leak age , ▁ex agger ated ▁by ▁the ▁use ▁of ▁a ▁log arith mic ▁presentation . ▁The ▁unit ▁of ▁frequency ▁is ▁" DF T ▁b ins "; ▁that ▁is , ▁the ▁integer ▁values ▁on ▁the ▁frequency ▁axis ▁correspond ▁to ▁the ▁frequencies ▁sample d ▁by ▁the ▁D FT . ▁ ▁So ▁the ▁figure ▁dep ict s ▁a ▁case ▁where ▁the ▁actual ▁frequency ▁of ▁the ▁sin us oid ▁coinc ides ▁with ▁a ▁D FT ▁sample , ▁and ▁the ▁maximum ▁value ▁of ▁the ▁spectrum ▁is ▁accur ately ▁measured ▁by ▁that ▁sample . ▁ ▁In ▁row ▁ 4 , ▁it ▁miss es ▁the ▁maximum ▁value ▁by ▁ ½ ▁bin , ▁and ▁the ▁result ant ▁measurement ▁error ▁is ▁referred ▁to ▁as ▁scal lop ing ▁loss ▁( in sp ired ▁by ▁the ▁shape ▁of ▁the ▁peak ). ▁ ▁For ▁a ▁known ▁frequency , ▁such ▁as ▁a ▁musical ▁note ▁or ▁a ▁sin us oid al ▁test ▁signal , ▁matching ▁the ▁frequency ▁to ▁a ▁D FT ▁bin ▁can ▁be ▁pre arr anged ▁by ▁choices ▁of ▁a ▁sampling ▁rate ▁and ▁a ▁window ▁length ▁that ▁results ▁in ▁an ▁integer ▁number ▁of ▁cycles ▁within ▁the ▁window . ▁ ▁No ise ▁band width ▁▁ ▁The ▁concepts ▁of ▁resolution ▁and ▁dynamic ▁range ▁tend ▁to ▁be ▁somewhat ▁subject ive , ▁depending ▁on ▁what ▁the ▁user