Low-power and low-frequency data transmission for stylus
First Claim
Patent Images
1. A method comprising:
- initiating an acquisition of a first signal from an electrode of a touch sensor according to an acquisition frequency of the touch sensor, wherein the first signal is driven at least in part by one or more objects within proximity of the touch sensor;
reversing, with a controller, a polarity of the first signal to produce a second signal;
storing a first modulated signal at an end of the acquisition of the first signal, wherein the first modulated signal comprises the second signal as modulated by one or more third-party signals during the acquisition of the first signal;
initiating an acquisition of a third signal from the electrode of the touch sensor, wherein;
the acquisition of the third signal precedes the acquisition of the first signal according to the acquisition frequency of the touch sensor; and
the third signal is driven at least in part by the one or more objects within proximity of the touch sensor;
storing a second modulated signal at an end of the acquisition of the third signal, wherein the second modulated signal comprises the third signal as modulated by the one or more third-party signals during the acquisition of the third signal; and
subtracting the first modulated signal from the second modulated signal to;
substantially suppress the one or more third-party signals; and
indicate whether the one or more objects have come within proximity of the touch sensor.
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Abstract
In one embodiment, a method includes initiating an acquisition of a first signal from an electrode of a touch sensor according to an acquisition frequency of the touch sensor. The method also includes reversing, with a controller, a polarity of the first signal to produce a second signal. The method also includes storing a first modulated signal at an end of the acquisition of the first signal, where the first modulated signal includes the second signal as modulated by one or more third-party signals during the acquisition of the first signal.
34 Citations
16 Claims
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1. A method comprising:
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initiating an acquisition of a first signal from an electrode of a touch sensor according to an acquisition frequency of the touch sensor, wherein the first signal is driven at least in part by one or more objects within proximity of the touch sensor; reversing, with a controller, a polarity of the first signal to produce a second signal; storing a first modulated signal at an end of the acquisition of the first signal, wherein the first modulated signal comprises the second signal as modulated by one or more third-party signals during the acquisition of the first signal; initiating an acquisition of a third signal from the electrode of the touch sensor, wherein; the acquisition of the third signal precedes the acquisition of the first signal according to the acquisition frequency of the touch sensor; and the third signal is driven at least in part by the one or more objects within proximity of the touch sensor; storing a second modulated signal at an end of the acquisition of the third signal, wherein the second modulated signal comprises the third signal as modulated by the one or more third-party signals during the acquisition of the third signal; and subtracting the first modulated signal from the second modulated signal to; substantially suppress the one or more third-party signals; and indicate whether the one or more objects have come within proximity of the touch sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computer-readable non-transitory storage medium embodying logic that is configured when executed to:
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initiate an acquisition of a first signal from an electrode of a touch sensor according to an acquisition frequency of the touch sensor, wherein the first signal is driven at least in part by one or more objects within proximity of the touch sensor; reverse a polarity of the first signal to produce a second signal; store a first modulated signal at an end of the acquisition of the first signal, wherein the first modulated signal comprises the second signal as modulated by one or more third-party signals during the acquisition of the first signal; initiate an acquisition of a third signal from the electrode of the touch sensor, wherein; the acquisition of the third signal precedes the acquisition of the first signal according to the acquisition frequency of the touch sensor; and the third signal is driven at least in part by the one or more objects within proximity of the touch sensor; store a second modulated signal at an end of the acquisition of the third signal, wherein the second modulated signal comprises the third signal as modulated by the one or more third-party signals during the acquisition of the third signal; and subtract the first modulated signal from the second modulated signal to; substantially suppress the one or more third-party signals; and indicate whether the one or more objects have come within proximity of the touch sensor. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A touch sensor system comprising:
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a touch sensor; a computer-readable non-transitory storage medium coupled to the touch sensor and embodying logic that is configured when executed to; initiate an acquisition of a first signal from an electrode of the touch sensor according to an acquisition frequency of the touch sensor, wherein the first signal is driven at least in part by one or more objects within proximity of the touch sensor; reverse a polarity of the first signal to produce a second signal; store a first modulated signal at an end of the acquisition of the first signal, wherein the first modulated signal comprises the second signal as modulated by one or more third-party signals during the acquisition of the first signal; initiate an acquisition of a third signal from the electrode of the touch sensor, wherein; the acquisition of the third signal precedes the acquisition of the first signal according to the acquisition frequency of the touch sensor; and the third signal is driven at least in part by the one or more objects within proximity of the touch sensor; store a second modulated signal at an end of the acquisition of the third signal, wherein the second modulated signal comprises the third signal as modulated by the one or more third-party signals during the acquisition of the third signal; and subtract the first modulated signal from the second modulated signal to; substantially suppress the one or more third-party signals; and indicate whether the one or more objects have come within proximity of the touch sensor. - View Dependent Claims (16)
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Specification