Tdk Corporation

Invensense, Inc.

Mamdouh Yanni

Peter George Hartwell

Xiaoyue Jiang

Mei-Lin Chan

Eiji Iwatsuki

In a method for multipath reflection correction of acoustic signals received at an ultrasonic sensor, acoustic signals are received at the ultrasonic sensor over a time of flight range. Characteristics of multipath reflection signals of received acoustic signals are determined, wherein the characteristics of the multipath reflection signals of the received acoustic signals comprise a relationship of primary signal contributions to multipath reflection signal contributions for the acoustic signals received at the ultrasonic sensor at a plurality of times of flight for a plurality of locations of the ultrasonic sensor. The characteristics of the multipath reflection signals of received acoustic signals are compared to the received acoustic signals. The primary signal contribution and the multipath reflection signal contribution of the received acoustic signals is determined at a plurality of times of flight of the time range based on the characteristics of the multipath reflection signals of received acoustic signals.

Acoustic multipath correction

Environmental conditions affecting a sensor having a thermal coefficient are compensated by applying an adaptive filter to an environmental condition reference signal. The resulting adaptive cancellation signal may be used to provide feedback control to a first heating element.

Adaptive sensor filtering

In a method for multipath reflection correction of acoustic signals received at an ultrasonic sensor, characteristics of multipath reflection signals of the ultrasonic sensor are accessed, wherein the characteristics of the multipath reflection signals include a relationship of primary signal contributions to multipath reflection signal contributions for acoustic signals received at the ultrasonic sensor at a plurality of times of flight for a plurality of locations of the ultrasonic sensor. Acoustic signals are received at the ultrasonic sensor over a time of flight range while a target is interacting with the ultrasonic sensor, wherein the acoustic signals include a primary signal contribution and a multipath reflection signal contribution. The characteristics of the multipath reflection signals are compared to received acoustic signals. The primary signal contribution of the received acoustic signals is determined at a plurality of times of flight of the time of flight range based on the characteristics of the multipath reflection signals.

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Brentwood, CA, United States of America

Mamdouh Yanni