form ▁under ▁analysis ▁compr ises ▁two ▁sin us oid s ▁of ▁different ▁frequencies , ▁leak age ▁can ▁inter f ere ▁with ▁our ▁ability ▁to ▁distinguish ▁them ▁spect r ally . ▁Possible ▁types ▁of ▁inter ference ▁are ▁often ▁broken ▁down ▁into ▁two ▁oppos ing ▁classes ▁as ▁follows : ▁If ▁the ▁component ▁frequencies ▁are ▁dis similar ▁and ▁one ▁component ▁is ▁we aker , ▁then ▁leak age ▁from ▁the ▁stronger ▁component ▁can ▁obsc ure ▁the ▁we aker ▁one ' s ▁presence . ▁But ▁if ▁the ▁frequencies ▁are ▁too ▁similar , ▁leak age ▁can ▁render ▁them ▁un resol v able ▁even ▁when ▁the ▁sin us oid s ▁are ▁of ▁equal ▁strength . ▁Windows ▁that ▁are ▁effective ▁against ▁the ▁first ▁type ▁of ▁inter ference , ▁namely ▁where ▁components ▁have ▁dis similar ▁frequencies ▁and ▁amplit udes , ▁are ▁called ▁high ▁dynamic ▁range . ▁Con vers ely , ▁windows ▁that ▁can ▁distinguish ▁components ▁with ▁similar ▁frequencies ▁and ▁amplit udes ▁are ▁called ▁high ▁resolution . ▁ ▁The ▁rect angular ▁window ▁is ▁an ▁example ▁of ▁a ▁window ▁that ▁is ▁high ▁resolution ▁but ▁low ▁dynamic ▁range , ▁meaning ▁it ▁is ▁good ▁for ▁distingu ishing ▁components ▁of ▁similar ▁amplitude ▁even ▁when ▁the ▁frequencies ▁are ▁also ▁close , ▁but ▁poor ▁at ▁distingu ishing ▁components ▁of ▁different ▁amplitude ▁even ▁when ▁the ▁frequencies ▁are ▁far ▁away . ▁High - resol ution , ▁low - dynamic - range ▁windows ▁such ▁as ▁the ▁rect angular ▁window ▁also ▁have ▁the ▁property ▁of ▁high ▁sens itivity , ▁which ▁is ▁the ▁ability ▁to ▁reve al ▁relatively ▁weak ▁sin us oid s ▁in