The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 24, 2020
Filed:
Jan. 29, 2020
Synaptics Incorporated, San Jose, CA (US);
Richard Bradley Hodges, San Jose, CA (US);
SYNAPTICS INCORPORATED, San Jose, CA (US);
Abstract
A method for detecting presence of a person includes emitting, by a speaker of a device, a plurality of ultrasonic ping signals, receiving, by a microphone of the device, a plurality of reflected ultrasonic ping signals, and processing the received reflected signals to determine a presence of a person within a predetermined distance of the device. The processing includes determining changes in the reflected signals relative to the emitted signals by generating an impulse response by cross-correlating the received signals and the emitted signals, averaging the cross-correlated impulse response over a set time period, and generating a detection signal by subtracting the averaged cross-correlated impulse response from an instantaneous impulse response, applying a time gating function to select a portion of the detection signal corresponding to the reflected signal from the predetermined distance from the device, and applying gain compensation to the time gated detection signal to compensate signal falloff.