System and method for signaling in sensor devices
First Claim
1. A processing system for an input device, the processing system comprising:
- transmitter module comprising transmitter circuitry, the transmitter module configured to simultaneously transmit a first transmitter signal with a first transmitter electrode and a second transmitter signal with a second transmitter electrode, wherein the first transmitter signal comprises a combination of a first heterodyne frequency and a carrier frequency and the second transmitter signal comprises a combination of a second heterodyne frequency and the carrier frequency;
receiver module comprising receiver circuitry, the receiver module configured to receive a first resulting signal with a receiver electrode, wherein the first resulting signal comprises first effects corresponding to the first transmitter signal and second effects corresponding to the second transmitter signal; and
a demodulating module configured to demodulate the first resulting signal to produce a plurality of demodulation signals, wherein the demodulating module comprises a first mixer, a second mixer, a third mixer, a first filter, a second filter and a third filter, wherein the first mixer comprises a mixing frequency corresponding to the carrier frequency, the second mixer comprises a mixing frequency corresponding to the first heterodyne frequency, and the third mixer comprises a mixing frequency corresponding to the second heterodyne frequency.
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Accused Products
Abstract
A processing system includes transmitter module, receiver module, and a demodulating module. The transmitter module comprises transmitter circuitry and is configured to simultaneously transmit a first transmitter signal with a first transmitter electrode and a second transmitter signal with a second transmitter electrode. The first transmitter signal includes a combination of a first heterodyne frequency and a carrier frequency. The second transmitter signal comprises a combination of a second heterodyne frequency and the carrier frequency. The receiver module comprise receiver circuitry and is configured to receive a first resulting signal with a receiver electrode, wherein the first resulting signal comprises first effects corresponding to the first transmitter signal and second effects corresponding to the second transmitter signal. The demodulating module is configured to demodulate the first resulting signal to produce a plurality of demodulation signals, wherein the demodulating module comprises a first mixer, a second mixer, a third mixer, a first filter, a second filter and a third filter. The first mixer includes a mixing frequency corresponding to the carrier frequency, the second mixer includes a mixing frequency corresponding to the first heterodyne frequency, and the third mixer includes a mixing frequency corresponding to the second heterodyne frequency.
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Citations
20 Claims
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1. A processing system for an input device, the processing system comprising:
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transmitter module comprising transmitter circuitry, the transmitter module configured to simultaneously transmit a first transmitter signal with a first transmitter electrode and a second transmitter signal with a second transmitter electrode, wherein the first transmitter signal comprises a combination of a first heterodyne frequency and a carrier frequency and the second transmitter signal comprises a combination of a second heterodyne frequency and the carrier frequency; receiver module comprising receiver circuitry, the receiver module configured to receive a first resulting signal with a receiver electrode, wherein the first resulting signal comprises first effects corresponding to the first transmitter signal and second effects corresponding to the second transmitter signal; and a demodulating module configured to demodulate the first resulting signal to produce a plurality of demodulation signals, wherein the demodulating module comprises a first mixer, a second mixer, a third mixer, a first filter, a second filter and a third filter, wherein the first mixer comprises a mixing frequency corresponding to the carrier frequency, the second mixer comprises a mixing frequency corresponding to the first heterodyne frequency, and the third mixer comprises a mixing frequency corresponding to the second heterodyne frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of capacitive sensing, the method comprising:
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simultaneously transmitting a first transmitter signal with a first transmitter electrode and a second transmitter signal with a second transmitter electrode, wherein the first transmitter signal comprises a combination of a first heterodyne frequency and a carrier frequency, and the second transmitter signal comprises a combination of a second heterodyne frequency and the carrier frequency; receiving a first resulting signal with a receiver electrode, wherein the first resulting signal comprises first effects corresponding to the first transmitter signal and second effects corresponding to the second transmitter signal; and demodulating the first resulting signal to produce a plurality of demodulation signals via a first mixer, a second mixer, a third mixer, a first filter, a second filter and a third filter, wherein the first mixer comprises a mixing frequency corresponding to the carrier frequency, the second mixer comprises a mixing frequency corresponding to the first heterodyne frequency, and the third mixer comprises a mixing frequency corresponding to the second heterodyne frequency, wherein a first demodulation signal of the plurality of demodulation signals is produced via the second mixer and the second filter and a second demodulation signal of the plurality of demodulation signals is produced via the third mixer and the third filter and wherein the first demodulation signal comprises the first effects the second demodulation signal comprises the second effects. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A capacitive sensor device comprising:
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a first transmitter electrode; a second transmitter electrode; a receiver electrode; and a processing system communicatively coupled to the first transmitter electrode and receiver electrode, the processing system configured to; simultaneously transmit a first transmitter signal with the first transmitter electrode and a second transmitter signal with a second transmitter electrode, wherein the first transmitter signal comprises a combination of a first heterodyne frequency and a carrier frequency and the second transmitter signal comprises combination of a second heterodyne frequency and the carrier frequency; receive a first resulting signal with a receiver electrode, wherein the first resulting signal comprises first effects corresponding to the first transmitter signal and second effects corresponding to the second transmitter signal; and demodulate the first resulting signal with a demodulating module to produce a plurality of demodulation signals, wherein the demodulating module comprises a first mixer, a second mixer, a third mixer, a first filter, a second filter and a third filter, wherein the first mixer comprises a mixing frequency corresponding to the carrier frequency, the second mixer comprises a mixing frequency corresponding to the first heterodyne frequency, and the third mixer comprises a mixing frequency corresponding to the second heterodyne frequency; acquire a first measurement of a change in capacitive coupling between the first transmitter electrode and the receiver electrode, the measurement based on a first demodulation signal of the plurality of demodulation signals; acquire a second measurement of a change in capacitive coupling between the second transmitter electrode and the receiver electrode, the measurement based on a second demodulation signal of the plurality of demodulation signals; and determine positional information for an input object based on the first and second measurements. - View Dependent Claims (18, 19, 20)
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Specification