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 micre ruito de fundo va ben, ma si tu pote audir un altere persona dicer parolas distincte, le registration debe esser rejectate. Typicamente isto eveni ubi le TV ha essite lassate accendite o ubi il ha un conversation vicin.