Static noise coming from iPad Air speaker.

today all of a audden I noticed whenever I press a pin or a keyboard press and it makes a keyboard noise the speakers make a quiet static noise and it stays for about 2 to 6 seconds. If I'm on the home screen and swipe down for the keyboard it also happens. Happens when ever the speakers could or after they are used. Is this normal or is it a defect of the product? Couldn't find anything on this. Thanks.