Earlens Corporation

Advanced Bionics Ag

Daniel J Freed

Sunil Puria

A processor comprises instructions to adjust a bias of an input signal in order to decrease a duty cycle of a pulse modulated optical signal. The bias can be increased, decreased, or maintained in response to one or more measured values of the signal. In many embodiments, a gain of the signal is adjusted with the bias in order to inhibit distortion. The bias can be adjusted slowly in order to inhibit audible noise, and the gain can be adjusted faster than the bias in order to inhibit clipping of the signal. In many embodiments, one or more of the bias or the gain is adjusted in response to a value of the signal traversing a threshold amount. The value may comprise a trough of the signal traversing the threshold.

Sliding bias and peak limiting for optical hearing devices

An exemplary passive acoustic proximity detection system is configured to determine a first acoustic spectrum of a first signal representative of audio detected and output by a first microphone configured to be positioned at an ear canal entrance of a user. The detection system is further configured to determine a second acoustic spectrum of a second signal representative of audio detected and output by a second microphone configured to be located away from the ear canal entrance. Based on a comparison of the first acoustic spectrum and the second acoustic spectrum, the detection system is configured to generate a proximity indicator indicative of a proximity of an object to the first microphone. Based on the proximity indicator, the detection system is configured to select a signal processing program for execution by the passive acoustic detection system.

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San Mateo, CA, United States of America

Daniel J Freed