Phase compensation for multi-stimulus controller
First Claim
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1. A method comprising:
- measuring phase characteristics of a plurality of transmit channels and sense channels of a multi-stimulus sensing system;
calculating a phase delay to apply to composite sense signals received by a sense channel based on the measured phase characteristics; and
calculating phase compensation values to apply to component signals of the composite sense signals received by the sense channel based on the phase characteristics and the phase delay.
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Abstract
Determining a compensated phase matrix for a multi-stimulus demodulation process is provided. A first drive line of a multi-stimulus sensing system is selected, and a stimulation signal is transmitted on the selected drive line. A channel gain resulting from the stimulation signal is measured from a received sense signal resulting from the stimulation signal. The measured channel gain is compared with a known channel gain to obtain an individual phase compensation for the selected drive line. A compensated phase matrix is formed of the individual phase compensation values for multiple drive lines.
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Citations
14 Claims
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1. A method comprising:
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measuring phase characteristics of a plurality of transmit channels and sense channels of a multi-stimulus sensing system; calculating a phase delay to apply to composite sense signals received by a sense channel based on the measured phase characteristics; and calculating phase compensation values to apply to component signals of the composite sense signals received by the sense channel based on the phase characteristics and the phase delay. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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a plurality of transmit channels configured to transmit drive signals simultaneously to stimulate a multi-touch sensor panel; a plurality of sense channels configured to receive sense signals generated by stimulation of the multi-touch sensor panel; and a demodulation section capable of; measuring phase characteristics of the plurality of transmit channels and sense channels; calculating a phase delay to apply to composite sense signals received by a sense channel based on the measured phase characteristics; and calculating phase compensation values to apply to component signals of the composite sense signals received by the sense channel based on the phase characteristics and the phase delay. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification