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The sensing device is a MEMS microphone that outputs a pulse density modulated (PDM) signal. There are chips available to directly interface such a microphone to a USB port, but [Mahesh] found ...
The world's first Complementary Metal-Oxide Semiconductor (CMOS) micro-electromechanical Systems (MEMS) microphone, Akustica's AKU2000 Microphone Chip is also the world's only single-chip silicon ...
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