Dynamic demodulation waveform adjustment for tonal noise mitigation
First Claim
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1. A touch controller comprising:
- a processor capable of;
generating a demodulation waveform;
determining a characteristic of a received signal from sense circuitry configured to sense a touch sensor panel;
adjusting the demodulation waveform to generate an adjusted demodulation waveform based on the determined characteristic of the received signal, wherein adjusting the demodulation waveform, based on the determined characteristic of the received signal comprises turning off the demodulation waveform for one or more durations within each period of the adjusted demodulation waveform and turning on the demodulation waveform for a remainder of each period;
mixing the adjusted demodulation waveform with a second received signal to produce a mixed signal; and
using the mixed signal to determine a touch at the touch sensor panel.
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Abstract
A touch controller on a touch sensitive device configured to generate a dynamic demodulation waveform so as to minimize the effects on a signal to noise ratio caused by a tonal noise is disclosed. The demodulation waveform can be turned off for finite durations so as to minimize the probability that a transitional voltage of the tonal noise source is included in the demodulation result.
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Citations
23 Claims
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1. A touch controller comprising:
a processor capable of; generating a demodulation waveform; determining a characteristic of a received signal from sense circuitry configured to sense a touch sensor panel; adjusting the demodulation waveform to generate an adjusted demodulation waveform based on the determined characteristic of the received signal, wherein adjusting the demodulation waveform, based on the determined characteristic of the received signal comprises turning off the demodulation waveform for one or more durations within each period of the adjusted demodulation waveform and turning on the demodulation waveform for a remainder of each period; mixing the adjusted demodulation waveform with a second received signal to produce a mixed signal; and using the mixed signal to determine a touch at the touch sensor panel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of demodulating a signal, the method comprising:
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generating a demodulation waveform; determining a characteristic of a received signal from sense circuitry configured to sense a touch sensor panel, wherein the determined characteristic of the received signal comprises a characteristic of a tonal noise source; adjusting the demodulation waveform to generate an adjusted demodulation waveform based on the determined characteristic of the received signal, wherein adjusting the demodulation waveform, based on the determined characteristic of the received signal comprises turning off the demodulation waveform for one or more durations within each period of the adjusted demodulation waveform and turning on the demodulation waveform for a remainder of each period; mixing the adjusted demodulation waveform with a second received signal to produce a mixed signal; and using the mixed signal to determine a touch at the touch sensor panel. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A non-transitory computer readable storage medium having stored thereon a set of instructions for demodulating a signal, that when executed by a processor causes the processor to:
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generate a demodulation waveform; determine a characteristic of a received signal from sense circuitry configured to sense a touch sensor panel; adjust the demodulation waveform to generate an adjusted demodulation waveform based on the determined characteristic of the received signal, wherein adjusting the demodulation waveform, based on the determined characteristic of the received signal comprises turning off the demodulation waveform for one or more durations within each period of the adjusted demodulation waveform and turning on the demodulation waveform for a remainder of each period; mix the adjusted demodulation waveform with a second received signal to produce a mixed signal; and use the mixed signal to determine a touch at the touch sensor panel. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification