Patent ID: 8995693
Filing Date: 2015-03-31
Classification: H04M,H04R

Abstract:
1. A microphone system comprising: a base; a first microphone apparatus having a first mechanical response and coupled to the base, the first microphone apparatus capable of producing a first output signal having a noise component, the first microphone apparatus having a first back-side cavity and a first diaphragm formed with a first diaphragm mass; a second microphone apparatus having a second mechanical response and coupled to the base, the second microphone apparatus capable of producing a second output signal, the second microphone apparatus having a second back-side cavity and a second diaphragm formed with a second diaphragm mass, the first and second back-side cavities being fluidly unconnected, the first diaphragm mass and the second diaphragm being substantially identical such that the first and second mechanical responses are effectively the same, the second microphone apparatus having a cap acoustically sealing the second diaphragm; and combining logic operatively coupled with the first microphone apparatus and the second microphone apparatus, the combining logic using the second output signal to remove at least a portion of the noise component from the first output signal.