Patent ID: 9084051
Filing Date: 2015-07-14
Classification: H04R

Abstract:
1. A unidirectional active microphone comprising: a piezoelectric component; a diaphragm operably coupled to a first side of the piezoelectric component; a coil operably coupled to a second opposite side of the piezoelectric component and operably connected to the diaphragm, wherein a vibration of the diaphragm causes oscillation of the coil; a circuit operably coupled to the coil and the piezoelectric component configured to provide mechanical amplification to the coil, wherein the circuit receives a voltage output from the coil, and wherein the circuit applies a voltage to the piezoelectric component thereby creating a unidirectional active microphone; and an elastic element operably coupled between the piezoelectric component and the diaphragm, wherein the voltage applied to the piezoelectric component breaks reciprocity between the diaphragm and the coil, and wherein the diaphragm and coil prevents distortion, based upon a linear combination of two or more input frequencies, of the diaphragm.