METHODS AND SYSTEMS FOR DETECTING A POSITION-BASED ATTRIBUTE OF AN OBJECT USING DIGITAL CODES
First Claim
1. A method of capacitive sensing with a position sensor, the method comprising:
- simultaneously transmitting a first modulation signal with a first transmitter electrode and a second modulation signal with a second transmitter electrode, wherein the first and second modulation signals are distinct modulation signals based different ones of a plurality of distinct digital codes, and further wherein at least one of the plurality of distinct digital codes indicates driven and un-driven states;
receiving resultant signals with a plurality of receiver electrodes, wherein the resultant signals comprise electrical effects associated with the first and second modulation signals; and
determining a first position-based attribute of a first object and second position-based attribute of a second object based on the resultant signals.
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Accused Products
Abstract
Methods, systems and devices are described for detecting a position-based attribute of a finger, stylus or other object with a touchpad or other sensor having a touch-sensitive region that includes a plurality of electrodes. Modulation signals for one or more electrodes are produced as a function of any number of distinct digital codes. The modulation signals are applied to an associated at least one of the plurality of electrodes to obtain a resultant signal that is electrically affected by the position of the object. The resultant signal is demodulated using the plurality of distinct digital codes to discriminate electrical effects produced by the object. The position-based attribute of the object is then determined with respect to the plurality of electrodes from the electrical effects.
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Citations
24 Claims
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1. A method of capacitive sensing with a position sensor, the method comprising:
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simultaneously transmitting a first modulation signal with a first transmitter electrode and a second modulation signal with a second transmitter electrode, wherein the first and second modulation signals are distinct modulation signals based different ones of a plurality of distinct digital codes, and further wherein at least one of the plurality of distinct digital codes indicates driven and un-driven states; receiving resultant signals with a plurality of receiver electrodes, wherein the resultant signals comprise electrical effects associated with the first and second modulation signals; and determining a first position-based attribute of a first object and second position-based attribute of a second object based on the resultant signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A controller for a capacitive position sensor, the controller comprising:
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drive circuitry configured to simultaneously transmit a first modulation signal with a first transmitter electrode and a second modulation signal with a second transmitter electrode, wherein the first and second modulation signals are distinct signals based on distinct digital codes, respectively, and further wherein at least one of the distinct digital codes indicates driven and un-driven states; and receiver circuitry configured to receive resultant signals with a plurality of receiver electrodes, the resultant signals comprising electrical effects associated with the first and second modulation signals; wherein the controller is configured determine a first position-based attribute of a first object and a second position-based attribute of a second object based on the resultant signals. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A position sensor comprising:
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a plurality of transmitter electrodes; a plurality of receiver electrodes; and a controller coupled to the plurality of transmitter electrodes and to the plurality of receiver electrodes and configured to; simultaneously transmit a first modulation signal with a first transmitter electrode and a second modulation signal with a second transmitter electrode, wherein the first and second modulation signals are distinct modulation signals based different ones of a plurality of distinct digital codes, and further wherein at least one of the plurality of distinct digital codes indicates driven and un-driven states; receiving resultant signals with a plurality of receiver electrodes, wherein the resultant signals comprise electrical effects associated with the first and second modulation signals; and determining a first position-based attribute of a first object and second position-based attribute of a second object based on the resultant signals. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification