Browse Publications Technical Papers 2017-01-1828

Error Microphone Placement Optimization for Concurrent MIMO Feedback ANC Systems 2017-01-1828

The use of active noise control (ANC) systems in automotive applications has been common practice for well over a decade. Many of these systems utilize at least one error microphone that is placed inside the vehicle cabin and provides feedback to the algorithm in order to assess the effectiveness of the anti-noise signal as it attempts to cancel primary noise. Prior work pertaining to optimal error microphone placement has not provided any objective metrics that correlate to the noise reduction experienced inside the vehicle cabin. The goal of this paper is to establish empirically-based metrics which can be used to quantitatively describe why one microphone position in the vehicle is superior or less favorable when compared to another. These metrics are used when considering concurrent multiple-input multiple-output (MIMO) ANC systems that utilize the same error microphones but are trying to attenuate both broadband and narrowband noise. Empirical correlation of these metrics with respect to the noise reduction achieved is shown with in-vehicle acoustic measurements. Cross-correlation effects were observed between error microphones in different quadrants of the vehicle; however, an average of the metrics and the noise reduction across all quadrants of the vehicle showed a meaningful correlation that can be used as the basis for further development of this methodology.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Active Control of Structure-Borne Road Noise Based on the Separation of Front and Rear Structural Road Noise Related Dynamics


View Details


Active Cancellation of Exhaust Noise over Broad RPM Range with Simultaneous Exhaust Sound Enhancement


View Details


Active Noise Control for the 4.0 TFSI with Cylinder on Demand Technology in Audi's S-Series


View Details