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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.
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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).

"Our low-power multi-mode microphone is ideal for any voice-controlled applications that require a high SNR and low power consumption in the smallest form factor. This includes various IoT [Internet of Things] devices that rely on battery power. The product has received a positive response from consumer electronics manufacturers and began shipping in volume to manufacturers in January,"  Thibault Kassir, senior director, Product Management, Mobile Consumer Electronics at Knowles told EE Times.

To read more: http://www.eetimes.com/document.asp?doc_id=1322995


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