What effect removes the buzzing noise in my recording

[tarap]

i used my mp3 player to record some everyday activity around the house. im trying to edit for, boosting the lower mid range . so the voices are easily heard , but there is a loud buzzing ,maybe an open air type of background noise that is distracting from what im trying to focus on. how to remove it is my question?

 

[MEgamer]

you sure its not ur mp3 player? such a small device cant have built shielding for every component you know.