Sonic Edge MEMS earphone driver module ST100 in Active Noise Control (ANC) feedback application 3.0

The driver/speaker technology for earphones has for a long time been dominated by the moving coil principle and has been refined and miniaturized until a kind of size limit seems to have reached at a diameter of approx. Ø5mm. This is for sure a very small component but compared to the size of the human ear canal on aver- age (Ø6mm, length 25mm & slightly S shaped), this is still too big a component to be placed inside, or even at the entrance of the ear canal.

Modulated ultrasound speakers – A common framework for analyzing air pump speakers