Hadamard ofdm for touch panel sensing
AssigneeMicrosoft Technology Licensing, LLC
InventorBenjamin Imanilov
Life of this patent
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Abstract
An electronic device is described which has a sensor panel comprising a plurality of transmit electrodes configured to form an electric field when driven and a plurality of receive electrodes configured to measure signals received from the transmit electrodes. The electronic device has a sensor panel control module configured to apply a driving signal to each of the transmit electrodes, and to compute the driving signals using orthogonal frequency division multiplexing to obtain a plurality of orthogonal subcarrier signals, and configured to apply a Hadamard matrix transform to the orthogonal subcarrier signals to compute final signals for driving the transmit electrodes.
Claims20
An electronic device comprising:
- a sensor panel comprising a plurality of transmit electrodes configured to form an electric field when driven and a plurality of receive electrodes configured to measure signals received from the transmit electrodes;
- and
- a sensor panel control module configured to apply a driving signal to each of the transmit electrodes, and to compute the driving signals using orthogonal frequency division multiplexing to obtain a plurality of orthogonal subcarrier signals, and configured to apply a Hadamard matrix transform to the orthogonal subcarrier signals to compute final signals for driving the transmit electrodes.
A sensor panel control module for controlling a sensor panel, the sensor panel control module comprising circuitry to compute, using orthogonal frequency division multiplexing, a plurality of orthogonal subcarrier signals, and configured to apply a Hadamard matrix transform to the orthogonal subcarrier signals to compute final signals for driving the transmit electrodes.
A method of controlling a sensor panel comprising:
- computing, using orthogonal frequency division multiplexing, a plurality of orthogonal subcarrier signals;
- applying a Hadamard matrix transform to the orthogonal subcarrier signals to compute final signals;
- applying the final signals to transmit electrodes of the sensor panel.
Dependencies are inferred from the claim text.