Samsung Galaxy MEGA SGH-I527 User Manual page 7

How Does It Work?
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The earSmart voice processor in your phone captures your voice and all the sounds around you.
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Working like the human ear, it processes and distinguishes these sounds, isolates your voice conversation, and removes background noise -
from both ends of a call.
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It also automatically equalizes and adjusts voice volume so you can hear and talk naturally, even in the noisiest places.
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With earSmart technology, you can talk where you want, and have clear conversations for mobile calls, video chats, even speakerphone calls,
without worrying about surrounding noise.