US 12,229,353 B2
Differential sensing in an active stylus
Kishore Sundara-Rajan, San Jose, CA (US); Yassar Ali, Sunnyvale, CA (US); Igor Polishchuk, Fremont, CA (US); and James D. Lyle, Santa Clara, CA (US)
Assigned to Wacom Co., Ltd., Saitama (JP)
Filed by Wacom Co., Ltd., Saitama (JP)
Filed on Nov. 30, 2023, as Appl. No. 18/525,165.
Application 18/525,165 is a continuation of application No. 17/698,767, filed on Mar. 18, 2022, granted, now 11,874,974.
Application 17/698,767 is a continuation of application No. 16/939,862, filed on Jul. 27, 2020, granted, now 11,301,060, issued on Apr. 12, 2022.
Application 16/939,862 is a continuation of application No. 13/434,596, filed on Mar. 29, 2012, granted, now 10,725,564, issued on Jul. 28, 2020.
Claims priority of provisional application 61/553,114, filed on Oct. 28, 2011.
Prior Publication US 2024/0094835 A1, Mar. 21, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/0354 (2013.01); G06F 3/038 (2013.01)
CPC G06F 3/03545 (2013.01) [G06F 3/0383 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A non-transitory computer-readable medium comprising logic, the logic configured to, when executed by one or more processors, cause the one or more processors to perform operations comprising:
receiving, with a first electrode of a first device, a first signal comprising a signal component, the first device being operable to communicate wirelessly with a second device via the first electrode and through a sensor of the second device;
receiving a second signal with a second electrode of the first device, the second signal comprising a signal component, the first signal and the second signal each containing noise having similar characteristics, and wherein the signal component of the first signal is a first version of a signal of the second device and the signal component of the second signal is a second version of the signal of the second device;
removing noise from the first signal by subtracting the second signal from the first signal, including generating an output that is the difference between the first signal and the second signal; and
determining the signal component of the first signal based on the output and the signal component of the second signal.