Samsung SM-N900TZKETMB - Manual (Page 7)

• Then isolates the primary voice in conversation and filters out the background noise - so the person you're calling hears only your voice,
without disturbing background noise.
• Dynamically equalizes and adjusts voice volume to optimize your calling experience, so you can hear clearly and don't need to speak louder to
overcome surrounding noise.
The noise suppression technology is built-in and already enabled in your new mobile phone. So it's ready to provide unsurpassed
voice clarity with every call.