The Real-Time Performance of a Two-Dimensional ANC Barrier using a DSP and Common Audio Equipment

Regular paper

Christian Kleinhenrich

University of Wuppertal

Wednesday 3 june, 2015, 10:20 - 10:40

0.7 Lisbon (47)

The paper deals with a two-dimensional Active Noise Control (ANC) system in a linear setup to be used as an active sound barrier. Common audio equipment in combination with a Texas Instruments C6455 fixed point digital signal processor (DSP) was used to construct this multiple input multiple output (MIMO) system. Appropriate ANC algorithms can be achieved in different ways by using model based approaches or adaptive techniques. Also combinations are possible. Usually, pressure and velocity microphones or pressure and pressure gradient microphones are combined as reference sensors in such a system. The paper presents the system setup and the underlying algorithms. It is demonstrated that the application of cardioid reference microphones is sufficient instead of using a combination of omnidirectional and bi-directional sensors. Additionally, measurement results are presented to evaluate the real- time performance of the system for band-pass filtered primary noise.

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