Small form factor consumer electronic (CE) devices such Echo Buds and Echo Loop with microphone functions are often required to be waterproof. Integrating waterproof feature at the microphone component level enables consistent audio performance and simplified product design. However, integrating the membrane on the small footprint of the microphone while maintaining the desired audio and water resistance performance has been a big challenge. This paper describes a “Graduation Hat” microphone lid technology to integrate a reactive waterproof acoustic membrane with less than 4dB additional acoustic attenuation compared to the same microphone without the membrane while providing 5atm waterproofing. Thereby enabling a more sleek design, consistent audio performance and simplified device level microphone integration.
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Hua, Yuyan; Taussig, Carl Philip; Chou, Shu-Yu; and Hogue, Doug Kenneth, "Graduation Hat Microphone for Waterproof Top Port Microphones", Technical Disclosure Commons, (January 28, 2020)