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US 2021/0278924 A1Published application
Nyquist signal to noise reduction
AssigneeTactual Labs Co.
InventorShawn Lee
Life of this patent
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Abstract
A method for avoiding noise in a display involves scanning a display at a sampling rate that is less than the Nyquist level sampling. After scanning the signals received at less than the Nyquist level, the measured signals are processed in order to determine where noise may be present. Subsequently, future scans are performed at a Fast Fourier Transform is performed on the results. This is used to determine at which frequencies there is noise. Subsequent scans can be taken to determine touch events that avoid locations where noise is present.
Claims20
A method for avoiding noise in a sensing system, comprising:
- sampling a first plurality of signals received at receiving antennas at a sampling rate less than a Nyquist sampling rate for signals transmitted during a first period of time;
- performing a Discrete Fourier Transform on measurements of the first plurality of signals;
- determining noise from performance of the Discrete Fourier Transform on the first plurality of signals;
- sampling a second plurality of signals received at receiving antennas at a sampling rate that is at least a Nyquist sampling rate for signals transmitted during a second period of time;
- performing a Discrete Fourier Transform on measurements of the second plurality of signals;
- and
- determining events from results of performing a Discrete Fourier Transform on measurements of the second plurality of signals while avoiding noise determined from the first plurality of signals.
4 more elements
A sensing system, comprising:
- a plurality of antennas adapted to receive signals;
- a processor adapted to;
- sample a first plurality of signals received at the plurality of receiving antennas at a sampling rate less than a Nyquist sampling rate for signals transmitted during a first period of time;
- perform a Discrete Fourier Transform on measurements of the first plurality of signals;
- determine noise from performance of the Discrete Fourier Transform on the first plurality of signals;
- sample a second plurality of signals received at receiving antennas at a sampling rate that is at least a Nyquist sampling rate for signals transmitted during a second period of time;
- perform a Discrete Fourier Transform on measurements of the second plurality of signals;
- and
- determine events from results of performing a Discrete Fourier Transform on measurements of the second plurality of signals while avoiding noise determined from the first plurality of signals.
6 more elements
Dependencies are inferred from the claim text.