Capacitive sensing using non-integer excitation
First Claim
1. A capacitive sensing device comprising:
- a first transmitter electrode, a second transmitter electrode, and a plurality of receiver electrodes; and
a processing system configured to;
concurrently drive the first transmitter electrode with a first transmitter signal and the second transmitter electrode with a second transmitter signal,wherein the first transmitter signal is based on a first digital code and the second transmitter signal is based on a second digital code,wherein the first digital code and the second digital code each comprise at least one non-integer multiple, andwherein concurrently driving the first transmitter electrode and the second transmitter electrode comprises performing pre-emphasis based on the at least one non-integer multiple in the first digital code and the second digital code,receive a plurality of resulting signals using a plurality of receiver electrodes, the plurality of resulting signals comprising effects of the first transmitter signal and the second transmitter signal, anddetermine positional information based on the plurality of resulting signals.
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Accused Products
Abstract
Capacitive sensing includes concurrently driving a first transmitter electrode with a first transmitter signal and a second transmitter electrode with a second transmitter signal. The first transmitter signal is based on a first digital code and the second transmitter signal is based on a second digital code. The first digital code and the second digital code each include at least one non-integer multiple. Capacitive sensing further includes receiving resulting signals using multiple receiver electrodes, the resulting signals include effects of the first transmitter signal and the second transmitter signal. Capacitive sensing further includes determining positional information based on the resulting signals.
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Citations
18 Claims
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1. A capacitive sensing device comprising:
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a first transmitter electrode, a second transmitter electrode, and a plurality of receiver electrodes; and a processing system configured to; concurrently drive the first transmitter electrode with a first transmitter signal and the second transmitter electrode with a second transmitter signal, wherein the first transmitter signal is based on a first digital code and the second transmitter signal is based on a second digital code, wherein the first digital code and the second digital code each comprise at least one non-integer multiple, and wherein concurrently driving the first transmitter electrode and the second transmitter electrode comprises performing pre-emphasis based on the at least one non-integer multiple in the first digital code and the second digital code, receive a plurality of resulting signals using a plurality of receiver electrodes, the plurality of resulting signals comprising effects of the first transmitter signal and the second transmitter signal, and determine positional information based on the plurality of resulting signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for capacitive sensing comprising:
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concurrently driving a first transmitter electrode with a first transmitter signal and a second transmitter electrode with a second transmitter signal, wherein the first transmitter signal is based on a first digital code and the second transmitter signal is based on a second digital code, wherein the first digital code and the second digital code each comprise at least one non-integer multiple, and wherein concurrently driving the first transmitter electrode and the second transmitter electrode comprises performing pre-emphasis based on the at least one non-integer multiple in the first digital code and the second digital code; receiving a plurality of resulting signals using a plurality of receiver electrodes, the plurality of resulting signals comprising effects of the first transmitter signal and the second transmitter signal; and determining positional information based on the plurality of resulting signals. - View Dependent Claims (12, 13, 14, 15)
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16. A processing system for capacitive sensing comprising:
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sensor circuitry configured to; concurrently drive a first transmitter electrode with a first transmitter signal and a second transmitter electrode with a second transmitter signal, wherein the first transmitter signal is based on a first digital code and the second transmitter signal is based on a second digital code, wherein the first digital code and the second digital code each comprise at least one non-integer multiple, and wherein concurrently driving the first transmitter electrode and the second transmitter electrode comprises performing pre-emphasis based on the at least one non-integer multiple in the first digital code and the second digital code, and receive a plurality of resulting signals using a plurality of receiver electrodes, the plurality of resulting signals comprising effects of the first transmitter signal and the second transmitter signal; and processing circuitry configured to; determine positional information based on the plurality of resulting signals. - View Dependent Claims (17, 18)
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Specification