presence noise
In telephony, a low-level artificial noise introduced into the receiver to indicate that the connection is still in effect, even though no voice sound is being transmitted (no one is speaking) or no voice sound is audible. [Mattila]
In telephony, a low-level artificial noise introduced into the receiver to indicate that the connection is still in effect, even though no voice sound is being transmitted (no one is speaking) or no voice sound is audible. [Mattila]