Okay so we recorded a silence on my computer an we did it for like a minute and when we played it to see if we had ghost's and we herd kind a like whistling an talking and I don't know what it is an we think there are ghost's in our house !

Was there a reason you were making that recording? Did you previously think something was in your home? Who else was in the home during the recording? IF it really is something causes by a spirit... I believe LOOKING for a spiritual manifestation can open the door for one to happen. A good example would be playing with a Ouija board... does something happen every time... no, but it can still open a doorway. I would suggest you stop SEEKING for something to happen... you don't know what you're going to invite.

The human brain is programmed to make order out of chaos when it can. That is one reason many people hear voices in the "white noise" associated with electronics.

The "voices" can be caused by recording equipment , extraneous electricity , radio waves , energy emitted by the sun , and hundreds of other things .

Make sure that what you "hear" is not being caused by any of these first.

Then start to look at paranormal causes.

Whistling can be caused by having the mic too close to the speaker. It happens all the time. Also speakers can pick up RF from any direction so it could be anything. The windings in the coil act like an antenna.

Also, if you live in an apartment or close to other houses, you'd be amazed at how well a mic can pick up background noises. Just something to think about...