A little background noise is okay, but if you can hear another person speaking distinct words, the clip should be rejected. Typically this happens where the TV has been left on, or where there is a conversation going on nearby.
Un pittin de sciato de fondo a va ben, ma se ti peu sentî unn’atra persoña ch’a parla de poule distinte, a registraçion a va refuâ. Pe-o sòlito, questo o l’accapita quande a televixon a l’é in fonçion, ò quande gh’é unna conversaçion da-a vexin.