Answer
You can whisper,write notes, text, e-mail, body language, and even use a sign language.
Step-by-step explanation
By adjusting your communication in these ways one can decrease noise. Whispering is where you speak softly to someone where the information will be only heard by the person you are addressing and this will not make any noise. Also use of a text or an email where the message will be delivered electronically but not verbally. Then there is the body language which is a nonverbal but a physical behavior used to express a certain information or also one can use sign language.