FREQUENCY CONVERSION IN A TOUCH SENSOR

摘要

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.

主权项

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; 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,combines the first touch signal with a second signal, the second signal having a second center frequency, andoutputs a lower frequency touch signal, the lower frequency touch signal having a center frequency that is lower than the center frequency of the first touch signal; touch processor for identifying touch on the touch interface by processing the lower frequency touch signal and outputting touch event data.