Texas Instruments Corporation

Brian Paul Burk

Sourabh Ravindran

Amardeep Sathyanarayana

Nitish Krishna Murthy

A method and apparatus for determining properties of at least one of a surface or materials adjacent to a portable device. The method includes windowing a segment of the received signal to remove an edge transients, computing the FFT power spectral density of the signal, determining a peak in the spectral energy at a frequency, finding local peaks by determining the difference in the signal amplitude is relation to a pre-determined threshold, and computing harmonic energy according to the local peaks and the difference and determining at least one property of the surface or material.

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Dallas, TX, United States of America

Brian Paul Burk