Apple Inc.

Yash Rohit Modi

Jeffrey J Terlizzi

Wendell B Sander

Jahan C Minoo

Bryan J James

Brian Sander

Vinay B Dixit

A mobile device includes a pedometer function that calculates an estimated distance based on sensor measurements. The sensor measurements are used to determine a step frequency of the user, which is used to estimate the distance traveled by the user. To correct for the unique step frequency of the user, a calibration factor is calculated that can be multiplied by the estimated distance to improve the accuracy of the distance estimate. New calibration factors resulting from calibration trials are assigned to step frequency bands. An average calibration factor is calculated for each frequency band. The average calibration factors of the bands are updated to ensure that the average calibration factor of any given band is greater than or equal to the average calibration factors in all lower bands.

Calibration factors for step frequency bands

Electronic devices may provide microphone bias voltages to accessories. The accessories may include circuitry powered from the microphone bias voltages. The output impedances and the voltages of the microphone bias voltages may be adjusted during operation of the electronic devices. An electronic device may provide a bias voltage to an accessory, may lower the output impedance of the bias voltage, and may increase the voltage of the bias voltage during operation of the electronic device. Accessories that received bias voltages with lowered impedances or raised voltage levels may exhibit greater tolerance to faults such as moisture-based shorts and may be able to continue operating even in the presence of some faults.

Electronic devices with adjustable bias impedances and adjustable bias voltages for accessories

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Cupertino, CA, United States of America

Yash Rohit Modi