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 ...

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X-FAB to Provide Foundry Services for Akustica's Family of CMOS MEMS Silicon Microphone Chips ERFURT, GERMANY and PITTSBURGH, PA -- May 31, 2006 -- Akustica, Inc., a pioneer in acoustic system-on-chip ...