Patent ID: 11923865
Assignee: GOOGLE LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 5:
6. A micro-electro-mechanical system (MEMS) microphone, the MEMS microphone comprising:
a MEMS transducer, the MEMS transducer having at least one backplate and a mechanical diaphragm forming a capacitor, the mechanical diaphragm configured to oscillate in response to changing air pressure, generating a first electrical signal;
at least one light sensor, the light sensor configured to detect electromagnetic radiation and generate a second electrical signal; and
a differential amplifying circuit, the differential amplifying circuit configured to receive the first and second electrical signals from the MEMS transducer and the light sensor, respectively, and produce a third electrical signal that is a difference between the first and second electrical signals.