US 12,079,428 B1
Frequency-based noise removal
Yael Livne, Tel Aviv (IL); Shai Levi, Or-Yehuda (IL); and Nadav Linenberg, Even Yehuda (IL)
Assigned to Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed by Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed on Mar. 20, 2023, as Appl. No. 18/186,501.
Int. Cl. G06F 3/041 (2006.01); G06F 3/0354 (2013.01)
CPC G06F 3/04182 (2019.05) [G06F 3/03545 (2013.01); G06F 2203/04106 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of managing radiofrequency noise in a digitizer to detect an active stylus signal having a working frequency within a defined bandwidth, the method comprising:
sampling radiofrequency signals measured by multiple antennas positioned across the digitizer, wherein the radiofrequency signals include noise components;
selecting an orthogonal frequency outside the defined bandwidth of the working frequency; and
cleaning the radiofrequency signals by removing at least some of the noise components from the radiofrequency signals measured by each antenna based at least on a sense signal measured at the orthogonal frequency by the each antenna.