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1. (WO2018005020) FRAME-PHASE SYNCHRONIZATION IN FREQUENCY DIVISION MODULATED TOUCH SYSTEMS

Pub. No.:    WO/2018/005020    International Application No.:    PCT/US2017/036158
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Wed Jun 07 01:59:59 CEST 2017
IPC: G06F 3/041
G06F 3/044
Applicants: TACTUAL LABS CO.
Inventors: MORELLI, Daniel John
ALACK, Robert Joseph, JR.
DUMAN, Kaan
LEIGH, Darren Laney
Title: FRAME-PHASE SYNCHRONIZATION IN FREQUENCY DIVISION MODULATED TOUCH SYSTEMS
Abstract:
A system and method for performing frame-phase synchronization on received frames of signal on a touch detector. An apparatus and method for synchronizing frames with the phase of one or more simultaneously transmitted signals on a touch detector. One or more row conductors and one or more column conductors are arranged such that the path of the row conductor(s) cross the path of the column conductor(s). A signal emitter simultaneously initiates transmission of orthogonal signals on each of the rows at each of a plurality of intervals starting at a first time, the orthogonal signals having a known initial phase. A receiver starts receiving frames on the column at each of the intervals, starting at a later time. A signal processor determines a measure of the extent to which each of the orthogonal signals are present within the received frame - and thus, the extent to which they were transmitted across the touch detector. The determined measures may be reflected in a heat map reflective of the state of the touch detector, and comparison of successive heat maps (or measures) being reflective of touch or changes in touch.