Samsung dv150 User Manual (en)

Shooting options
In Video Shooting mode, press [m].
Select Voice.
Select an option.
Sound Alive On: Turn on the Sound Alive function to reduce the 
zoom noise.
Sound Alive Off: Turn off the Sound Alive function.  
The camera can record the zoom noise.
Mute: Do not record sounds.
Do not block the microphone when you use the Sound Alive function.
Recordings made with Sound Alive may differ from actual sounds.
Reducing the sound of the zoom
When you use the zoom while recording videos, the camera can record the sound of the zoom. Use the Sound Alive function to reduce the zoom noise.