Active stylus with filter having a threshold
In one embodiment, a method includes receiving at a stylus a receive signal from a device. The stylus includes one or more computer-readable media embodying logic, and the device includes a touch sensor. The receive signal is received at the stylus through the touch sensor of the device and one or more electrodes of the stylus. The method includes determining whether a level of the receive signal substantially meets or exceeds a pre-determined threshold; if the level of the receive signal substantially meets or exceeds the pre-determined threshold, then transmitting the receive signal to the logic for processing; and, if the level of the receive signal does not substantially meet or exceed the pre-determined threshold, then filtering out the receive signal from processing by the logic.
1. A method comprising:
receiving at a stylus a receive signal from a device, the stylus comprising one or more computer-readable non-transitory storage media embodying logic, the device comprising a touch sensor, the receive signal being received at the stylus through the touch sensor of the device and one or more electrodes of the stylus;
determining whether a level of the receive signal substantially meets or exceeds a first pre-determined threshold;
if the level of the receive signal substantially meets or exceeds the first pre-determined threshold, then transmitting the receive signal to the logic for processing;
if the level of the receive signal does not substantially meet or exceed the first pre-determined threshold, then filtering out the receive signal from processing by the logic;
comparing the level of the receive signal to a second pre-determined threshold;
based at least in part on the comparison, dynamically adjusting the first pre-determined threshold;
receiving at the stylus a second receive signal from the device; and
determining whether a level of the second receive signal substantially meets or exceeds the dynamically adjusted first pre-determined threshold.
2. The method of claim 1 , wherein one or more of the electrodes of the stylus are disposed on or in a tip of the stylus.
3. The method of claim 1 , wherein the processing by the logic comprises filtering the receive signal.
4. The method of claim 1 , further comprising transmitting from an electrode of the stylus a transmit signal that is a function of the receive signal.
5. One or more computer-readable non-transitory storage media embodying first logic that is operable when executed to:
receive a receive signal transmitted from a device to a stylus, the stylus comprising the media, the media further embodying second logic, the device comprising a touch sensor, the receive signal being received at the stylus through the touch sensor of the device and one or more electrodes of the stylus;
determine whether a level of the receive signal substantially meets or exceeds a first pre-determined threshold;
if the level of the receive signal substantially meets or exceeds the first pre-determined threshold, then transmit the receive signal to the second logic for processing;
if the level of the receive signal does not substantially meet or exceed the first pre-determined threshold, then filter out the receive signal from processing by the second logic;
compare the level of the receive signal to a second pre-determined threshold; and
based at least in part on the comparison, dynamically adjust the first pre-determined threshold.
6. The media of claim 5 , wherein one or more of the electrodes of the stylus are disposed on or in a tip of the stylus.
7. The media of claim 5 , wherein the processing by the second logic comprises filtering the receive signal.
8. The media of claim 5 , wherein the second logic is operable to cause to be transmitted from an electrode of the stylus a transmit signal that is a function of the receive signal.
9. The media of claim 5 , wherein a comparator embodies the first logic.
10. The media of claim 5 , wherein a controller or analog circuitry embodies the second logic.
11. The media of claim 5 , wherein a controller embodies the first logic and the second logic.
12. The media of claim 5 , wherein a single controller comprises all the media.
13. A stylus comprising:
one or more electrodes; and
one or more computer-readable non-transitory storage media embodying:
first logic that is operable when executed to:
receive a receive signal transmitted from a device to a stylus, the stylus comprising the media, the media further embodying second logic, the device comprising a touch sensor, the receive signal being received at the stylus through the touch sensor of the device and one or more electrodes of the stylus;
determining whether a level of the receive signal substantially meets or exceeds a first pre-determined threshold;
if the level of the receive signal substantially meets or exceeds the first pre-determined threshold, then transmitting the receive signal to the second logic for processing;
if the level of the receive signal does not substantially meet or exceed the first pre-determined threshold, then filtering out the receive signal from processing by the second logic;
compare the level of the receive signal to a second pre-determined threshold; and
based at least in part on the comparison, dynamically adjust the first pre-determined threshold.
14. The stylus of claim 13 , wherein the processing by the second logic comprises filtering the receive signal.