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Jul 8th, 2014
Lowest power MEMS mic cuts noise
Always-on voice-activated applications, from smartphones to wearables to industrial control headsets -- at the very least have to leave the microphone drawing power 24/7.
Older dynamic microphones required no power to be "on," but those mammoth beasts will not fit inside pint-sized devices. To solve the problem, Knowles Corp. (Itasca, Ill.) claims to have designed a micro-electro-mechanical system (MEMS) microphone that uses three-times less power than other digital MEMS microphones -- just 235 microAmps. Other firsts claimed by Knowles is that its SPH0641LM4H-1 is 20-percent smaller, 3.50 x 2.65 x 0.98 millimeters, and has the highest signal-to-noise (SNR) of any low-power digital MEMS microphone, 64.3 dB (using A rating).
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