Advanced techniques using microphones, amplifiers, loudspeakers, and advanced digital signal processing are used to reduce automotive in-cabin noise, enabling background-noise reduction, clear voice communication between passengers, and emergency and high-fidelity hands-free voice calling.
source http://www.electronicproducts.com/Automotive/How_designers_can_harness_new_automotive_audio_technologies_for_active_noise_cancellation.aspx
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