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[* black] Apple is following in the footsteps of the Nexus One by using dual microphones to help improve audio quality and suppress background noise.
[* black] Interestingly, the two microphones are positioned at the two far ends of the phone. The microphone at the top of the iPhone is most likely utilized for capturing background noise to be analyzed by internal circuitry and used to cancel any noise put into the main microphone other than the user's voice.
[* black] An improved audio chamber aids in clarifying sounds leaving the iPhone including calls via speakerphone as well as music played through the internal speaker.