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Master-Vortrag: Multi-Channel Filter Design for Headphones with Active Noise Cancelling
Montag, 19. Juli 2021
Active noise cancellation (ANC) headphones became increasingly popular during the last decade. They are especially capable of reducing low-frequent noise, where the passive isolation of headphones is ineffective. Nowadays, commercial ANC headphones mostly use a single reference microphone. This limits the maximum achievable active attenuation. Adding multiple reference microphones to headphones can overcome these limitations by exploiting the spatial characteristics of the incoming noise.
This thesis presents two different multi-channel filter strategies for feedforward ANC in headphones. On the one hand, a time-invariant filter for reducing diffuse noise and on the other hand a time-variant filter structure for reducing directional non-stationary noise are presented. Additionally, a commercial ANC headphone is extended by multiple reference microphones and the increase in active attenuation based on the microphone positions is evaluated. The results indicate that both filter techniques can improve the achievable active attenuation for their dedicated use cases. Furthermore, the active attenuation can be improved by additional microphones if they are placed on the side of the corresponding loudspeaker.
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