Patent ID: 8391517

Claim:
A system, comprising: a first substrate capable of routing electronic signals; a die attached to the first substrate, wherein the die comprises a sensing structure configured to vibrate in response to acoustic waves, wherein the die forms a first cavity between the first substrate and the sensing structure; a light source within the first cavity, wherein the light source is configured to transmit laser light to the sensing structure; one or more photo detectors attached to the first substrate within the first cavity, wherein the one or more photo detectors are configured to receive the laser light after reflection from the sensing structure to measure acoustic vibrations of the sensing structure, wherein the one or more photo detectors are configured to generate electrical signals based on the measured acoustic vibrations of the sensing structure; and wherein the light source and the one or more photo detectors are configured for coupling to a circuit, wherein the circuit is configured to: receive the electrical signals from the one or more photo detectors; and provide audio signals based on the electrical signals.