HARMAN HALOsonic® Active Noise Cancellation

The sound of silence

Unwanted noises can ruin a driving experience, increase driver drowsiness and interfere with in-cabin conversations. HARMAN has identified these unwanted sounds and developed a suite of noise cancellation technologies designed to reduce in-cabin noise significantly: HARMAN HALOsonic^® Road Noise Cancellation (RNC) and Engine Order Cancellation (EOC). These technologies help to refine the interior sound experience and help Original Equipment Manufacturers (OEMs) reduce emissions and fuel consumption.

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Adjusting Sound for Comfort

Road Noise Cancellation (RNC)

The RNC controller uses reference signals received from accelerometers placed throughout the suspension and chassis to predict the noise transferred into the cabin and to generate an anti-noise wave.
Adaptive feedback control from error microphones in the car roof further enhances system performance.
RNC allows OEMs to use lighter structural materials by helping to compensate for the resulting increase in interior noise, which enable them to lower fuel consumption and CO2 emissions without compromising the performance of the car.

Engine Order Cancellation (EOC)

The EOC controller uses the engine RPM signal as a reference to generate a sound wave that is opposite in phase to the engine vibration induced noise.
The error microphones mounted in the roof of the car provide feedback on the amplitude and phase to refine noise-cancelling effects.

Virtual Microphone Technology

Provides a means of predicting noise levels more accurately at occupant ear locations using existing error microphones.
These predictions enable opportunities for cost savings through reduction of hardware via synergies with microphones used for other technologies.

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