Patent ID: 8994926
Filing Date: 2015-03-31
Classification: G01S

Abstract:
1. An optical sensor that can be used to detect the presence, proximity and/or motion of an object within the sense region of the optical sensor, comprising: a driver adapted to selectively drive a light source; a light detector adapted to produce a detection signal indicative of an intensity of light detected by the light detector; an echo canceller adapted to produce an echo cancellation signal that is combined with the detection signal produced by the light detector to produce an echo cancelled detection signal, the echo canceller including a coefficient generator that is adapted to produce echo cancellation coefficients that are indicative of distance(s) to one or more objects, if any, within the sense region of the optical sensor; and an analog-to-digital converter (ADC) that converts the echo cancelled detection signal to a digital version of the echo cancelled detection signal which is provided to the coefficient generator, wherein the ADC can be part of the echo canceller or external to the echo canceller.