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US 10,705,667 B2Granted
Phase shift and phase shift assisted sensing
AssigneeTactual Labs Co.
InventorBraon Moseley
Life of this patent
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Abstract
Disclosed is a phase measurement system and method. Multiple frequency orthogonal signals are transmitted simultaneously along the same row conductor. One of the signals may be low frequency signal. The other signal may be a high frequency signal. The field of the low frequency signal may extend further above a touch surface than the high frequency signal. The phase data from the low frequency signal may be used to provide information about a touch event.
Claims16
An apparatus comprising:
- a plurality of antennas mounted on a substrate;
- a signal generator conductively connected to each of at least a first group of the plurality of antennas, the signal generator adapted to generate a plurality of distinct signals during a plurality of sequential integration periods, wherein the plurality of sequential integration periods are frame-phase synchronized;
- a signal receiver conductively connected to each of at least a second group of the plurality of antennas, the signal receiver adapted to take a sequence of digital samples of signals on each of at least a second antenna group during the plurality of sequential integration periods;
- a signal processing system operatively connected to the signal receiver, the signal processing system being adapted to:
- perform a discrete Fourier transform on each sequence of digital samples taken during each of the plurality of sequential integration periods;
- determine a phase angle corresponding to each of the plurality of distinct signals in each sequence of digital samples for each of the plurality of sequential integration periods;
- and
- utilize the phase angle of at least one of the plurality of distinct signals to identify a touch event, wherein the phase angle is used to form a heatmap.
5 more elements
A method comprising the steps of:
- generating a plurality of distinct signals on at least a first group of a plurality of antennas during a plurality of sequential integration periods, wherein the plurality of sequential integration periods are frame-phase synchronized;
- taking a sequence of digital samples of signals received on each of at least a second antenna group of the plurality of antennas during the plurality of sequential integration periods;
- performing a discrete Fourier transform on each sequence of digital samples taken during each of the plurality of sequential integration periods;
- determining a phase angle corresponding to each of the plurality of distinct signals in each sequence of digital samples for each of the plurality of sequential integration periods;
- and
- utilizing the phase angle of at least one of the plurality of distinct signals to identify a touch event, wherein the phase angle is used to form a heatmap.
3 more elements
Dependencies are inferred from the claim text.