Frequency conversion in a touch sensor
First Claim
Patent Images
1. 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, the plurality of unique orthogonal signals being in a first range of frequencies and having a first frequency spacing, and the first range of frequencies having a first center frequency;
frequency converter that;
receives a first touch signal present on at least one of the plurality of columns, the first touch signal comprising signals within the first range of frequencies,combines the first touch signal with a second signal, andoutputs a lower frequency touch signal, the lower frequency touch signal comprising signals within a second range of frequencies at the first frequency spacing, the second range of frequencies having a center frequency that is lower than the first center frequency;
touch processor for identifying touch on the touch interface by processing the lower frequency touch signal 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.
12 Citations
36 Claims
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1. 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, the plurality of unique orthogonal signals being in a first range of frequencies and having a first frequency spacing, and the first range of frequencies having a first center frequency; frequency converter that; receives a first touch signal present on at least one of the plurality of columns, the first touch signal comprising signals within the first range of frequencies, combines the first touch signal with a second signal, and outputs a lower frequency touch signal, the lower frequency touch signal comprising signals within a second range of frequencies at the first frequency spacing, the second range of frequencies having a center frequency that is lower than the first center frequency; touch processor for identifying touch on the touch interface by processing the lower frequency touch signal and outputting touch event data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A touch sensitive device comprising:
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touch interface comprising rows and columns; signal generator for generating a plurality of unique frequency orthogonal signals on at least a plurality of the rows, respectively, the plurality of unique frequency orthogonal signals being in a first range of frequencies and having a first frequency spacing, and the first range of frequencies having a first center frequency; frequency converter that; receives a touch signal present on at least one of the plurality of columns comprising signals within the first range of frequencies, converts the first touch signal to a second signal being in a second range of frequencies and having the first frequency spacing, the 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 wherein the second signal has frequency bins which have been aligned by the frequency converter, thereby facilitating processing of the second signal by the touch processor. - View Dependent Claims (24, 25)
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26. A system for pre-processing touch signals from a plurality of columns of a touch surface of a fast multi-touch sensor device, the system comprising:
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receiver operatively attached to each of a plurality of columns of a fast multi-touch sensor device and adapted to receive a plurality of source touch signals from each of a plurality of columns, the plurality of source touch signals each comprising signals in a first band of signals having a first frequency spacing, the first band of signals having a first center frequency, frequency converter to combine each of the received plurality of source touch signal with a mixer signal, and output a plurality of pre-processed touch signals, the plurality of pre-processed touch signals each comprising signals in a second band of signals having the first frequency spacing, the second band of signals having a second center frequency. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification