The equivalent of external noise is the inner noise of thinking. The equivalent of external silence is inner stillness.
Whenever there is some silence around you—listen to it. That means just notice it. Pay attention to it. Listening to silence awakens the dimension of stillness within yourself, because it is only through stillness that you can be aware of silence.
See that in the moment of noticing the silence around you, you are not thinking. You are aware, but not thinking.