FREQUENCY CONVERSION IN A TOUCH SENSOR
First Claim
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28. A touch sensitive device comprising:
- touch interface comprising rows and columns;
signal generator for generating a plurality of unique orthogonal signals on at least a plurality of the rows, respectively;
frequency converter that;
receives a first touch signal present on at least one of the plurality of columns, the first touch signal having a first center frequency,converts the first touch signal to a second signal having a second center frequency, andoutputs the second signal having the second center frequency;
touch processor for identifying touch on the touch interface by processing the second signal having the second center frequency and outputting touch event data.
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Abstract
A touch sensitive device includes a touch interface having rows and columns, a signal generator for generating a plurality of unique orthogonal signals on at least a plurality of the rows, respectively, and a frequency converter. The frequency converter receives a first touch signal present on at least one of the plurality of columns, converts the first touch signal to a second signal having a second center frequency, and outputs the second signal. A touch processor is identifies touch on the touch interface by processing the second signal having the second center frequency and outputting touch event data.
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Citations
88 Claims
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28. A touch sensitive device comprising:
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touch interface comprising rows and columns; signal generator for generating a plurality of unique orthogonal signals on at least a plurality of the rows, respectively; frequency converter that; receives a first touch signal present on at least one of the plurality of columns, the first touch signal having a first center frequency, converts the first touch signal to a second signal having a second center frequency, and outputs the second signal having the second center frequency; touch processor for identifying touch on the touch interface by processing the second signal having the second center frequency and outputting touch event data. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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38-1. The touch sensitive device of claim 31, wherein the touch processor comprises a processor configured to perform cross-correlation using a Fourier transform.
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45. The touch sensitive device of claim 39, configured to perform the cross-correlation digitally such that the signal of each column is analyzed to determine which and how much of a signal of interest from each row of the touch interface is present on each column of the touch interface.
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55. A touch sensitive device comprising:
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touch interface comprising rows and columns; signal generator for generating a plurality of unique orthogonal signals on at least a plurality of the rows, respectively; a local oscillator generating a second signal, the second signal having a second center frequency; heterodyning frequency mixer configured to receive a first touch signal present on at least one of the plurality of columns, the first touch signal having a first center frequency, and the second signal, and to output a heterodyned signal based upon the first touch signal and the second signal, the heterodyned signal having a center frequency that is different than the center frequency of the first touch signal; touch processor for identifying touch on the touch interface by processing the heterodyned signal and outputting touch event data. - View Dependent Claims (56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88)
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Specification