Samsung UN60ES7500FXZA - Manual (Page 431)

If you want to use the TV's
microphone, turn on the preference in
System settings. ( System → Voice and
Motion Control → Voice Control )
N When using the microphone on
your Smart Touch Control, speak a
voice command using your normal
speaking voice into the microphone
on your Smart Touch Control. The
optimum distance from your face
should be approximately 0.3
— 0.4