Squeaky engine noise?

i have a squeaky noise coming from the engine of my 1.0l corsa. Im not 100% sure what it is, is it the drive belt drive chain fan belt stone stuck between a wheel i dont know. There is no noise when i start the engine or move off. After a certain speed you can hear it faintly then when you go faster it gets louder but then starts to kind of wear away and like coming back every so often, but when you go more faster it just seems to dissappear