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Fusion of Analysis, Simulation, & Testing

innovation through vibration

Texas A&M University College of Engineering

Investigation and mitigation of flow induced noise in consumer electronics and hearing aid devices

Consumer electronics (CE) and hearing aid (HA) devices are integrating microphones in an increasing number of products and an increasing number of microphones per device. Some of these devices use Electret Condenser Microphones (ECMs). However, most recent CE devices implement MicroElectro Mechanical Systems (MEMS) microphones. Microphones are not only sensitive to pressure changes from acoustic disturbances but also from hydrodynamic flows and eddies (i.e. turbulence interacting with the microphone membrane). This flow-induced microphone noise occurs when these devices face real-world wind conditions. Even though wind artifacts can be managed/mitigated in the signal processing domain, the strategy for best audio quality is to address flow noise first in the physical domain to reduce caustic effects of algorithms. Although HAs and other head-worn devices may be able to shield their microphones, the physics behind the flow-induced noise phenomenon demands a better explanation. This would allow for implementing well-suited solutions.

 

 

 

 

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