Abstract
Electret condenser microphone elements ruled for decades, are being displaced, at first in the late 1990s, and more rapidly in the last decade, by capacitive MEMs. Breaking the signal to noise ceiling at 70 dB in small consumer electronics microphone formats has been a tenacious barrier for far field voice control and sound pickup. Some existing conventional solutions and those just below the radar are more than promising. The advances in materials science in the last few years have been remarkable. Product demand in all categories, especially mobile electronics and voice command, are driving this rapid advancement. Some of these developments in materials and their application to existing microphones and for the next generation microphone products will be revealed. “Weird microphone science projects” that are jelling toward commercial productization, such as graphene electrostatic and ribbon mics, optical microphones, piezo MEMs, insect eye mics, and more will be explored.
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