SYSTEMS AND METHODS FOR SIGNALING AND INTERFERENCE DETECTION IN SENSOR DEVICES
First Claim
1. A processing system for an input device, the processing system comprising:
- a sensor module comprising sensor circuitry, the sensor module configured to transmit a first transmitter signal with a transmitter electrode and receive a resulting signal with a receiver electrode, wherein the first transmitter signal comprises a first transmitter frequency, and the resulting signal comprises effects corresponding to the first transmitter signal; and
a demodulation module configured to demodulate the resulting signal to produce first and second output signals, the demodulation module comprising;
a first mixing stage comprising a first mixing frequency and a second mixing frequency; and
a second mixing stage comprising a third mixing frequency and a fourth mixing frequency;
wherein the third mixing frequency is a combination of the first mixing frequency and the first transmitter frequency; and
wherein the demodulation module is configured to determine a first measurement of a change of capacitive coupling between the transmitter electrode and the receiver electrode based on the first output signal, and to determine positional information for an input object based on the first measurement.
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Accused Products
Abstract
An input device processing system comprises a sensor module that transmits a first transmitter signal with a transmitter electrode and receives a resulting signal with a receiver electrode. The first transmitter signal comprises a first transmitter frequency, and the resulting signal comprises effects corresponding to the first transmitter signal. A demodulation module demodulates the resulting signal to produce a first signal (e.g., an upper sideband signal) and a second signal (a lower sideband signal), selectably determines a first measurement of a change in capacitive coupling between the transmitter electrode and the receiver electrode based on at least one of the first and second signals, and determines positional information for an input object based on the first measurement.
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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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a sensor module comprising sensor circuitry, the sensor module configured to transmit a first transmitter signal with a transmitter electrode and receive a resulting signal with a receiver electrode, wherein the first transmitter signal comprises a first transmitter frequency, and the resulting signal comprises effects corresponding to the first transmitter signal; and a demodulation module configured to demodulate the resulting signal to produce first and second output signals, the demodulation module comprising; a first mixing stage comprising a first mixing frequency and a second mixing frequency; and a second mixing stage comprising a third mixing frequency and a fourth mixing frequency; wherein the third mixing frequency is a combination of the first mixing frequency and the first transmitter frequency; and wherein the demodulation module is configured to determine a first measurement of a change of capacitive coupling between the transmitter electrode and the receiver electrode based on the first output signal, and to determine positional information for an input object based on the first measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A capacitive sensor device comprising:
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a transmitter electrode; a receiver electrode; and a processing system communicatively coupled to the transmitter electrode and the receiver electrode, the processing system comprising a first mixing stage comprising a first mixing frequency and a second mixing frequency, and a second mixing stage comprising a third mixing frequency and a fourth mixing frequency, wherein the third mixing frequency is a combination of the first mixing frequency and the first transmitter frequency, the fourth mixing frequency is in quadrature with the third mixing signal, and the second mixing frequency is in quadrature with the first mixing signal; wherein the processing system is configured to; transmit a first transmitter signal with the transmitter electrode and receive a resulting signal with the receiver electrode, wherein the first transmitter signal comprises a first transmitter frequency, and the resulting signal comprises effects corresponding to the first transmitter signal; demodulate the resulting signal to produce first and second output signals; and determine a first measurement of a change of capacitive coupling between the transmitter electrode and the receiver electrode based on the first output signal, and to determine positional information for an input object based on the first measurement. - View Dependent Claims (13, 14, 15, 16)
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17. A method of capacitive sensing, the method comprising:
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transmitting a first transmitter signal with a transmitter electrode, the first transmitter signal comprising a first transmitter frequency; receiving a resulting signal with a receiver electrode, the resulting signal comprising effects corresponding to the first transmitter signal; demodulating the resulting signal to produce a first output signal and a second output signal by mixing the resulting signal with a first mixing stage and a second mixing stage, wherein the first mixing stage comprises a first mixing frequency and a second mixing frequency and the second mixing stage comprises a third mixing frequency and a fourth mixing frequency, and wherein the third mixing frequency corresponds to the absolute value of the difference between the first mixing frequency and the first transmitter frequency; determining a first measurement of a change of capacitive coupling between the transmitter electrode and the receiver electrode based on the first output signal; and determining positional information for an input object based on the first measurement. - View Dependent Claims (18, 19, 20)
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Specification