Baseline estimation for sensor system
A control method for a user interface system may include receiving an input signal, receiving a temperature signal indicative of a temperature, generating a baseline signal based on at least one among the input signal and the temperature signal, calculating an error signal based on a difference of the input signal and the baseline signal, and modifying the baseline signal based on the error signal.
1. A control method for a user interface system comprising:
receiving an input signal;
receiving a temperature signal indicative of a temperature;
generating a baseline signal based on at least one among the input signal and the temperature signal;
calculating an error signal based on a difference of the input signal and the baseline signal; and
modifying the baseline signal based on the error signal.
2. The method of claim 1 , further comprising monitoring for changes of the phase in the input signal.
3. The method of claim 1 , wherein the error signal is calculated based on a difference between an instantaneous phase of the input signal and an output of a phase integrator.
4. The method of claim 1 , further comprising:
comparing the error signal to a threshold; and
reducing a gain factor applied to the error signal in order to calculate the baseline signal if the error signal is greater than the threshold.
5. The method of claim 4 , further comprising controlling the gain factor based on the temperature.
6. The method of claim 3 , wherein controlling the gain factor based on the temperature comprises controlling the gain factor based on a time rate of change of the temperature.
7. The method of claim 1 , wherein the input signal is generated by a force sensor.
8. The method of claim 7 , wherein the force sensor is configured to sense a force associated with a human interaction with a virtual button.
9. The method of claim 7 , wherein the force sensor comprises one of a capacitive displacement sensor, an inductive force sensor, a resistive-inductive-capacitive sensor, a strain gauge, a piezoelectric force sensor, a force sensing resistor, a thin film force sensor, or a quantum tunneling composite-based force sensor.
10. The method of claim 1 , wherein the input signal is indicative of a phase.
11. The method of claim 1 , further comprising generating a corrected input signal based on the baseline signal and the input signal.
12. The method of claim 1 , further wherein:
modifying the baseline signal comprising modifying the baseline signal in accordance with an update frequency; and
setting the update frequency based on the temperature.
13. The method of claim 4 , further wherein:
modifying the baseline signal comprising modifying the baseline signal in accordance with an update frequency; and
setting the update frequency based on a time rate of change of the temperature.
14. A system comprising:
a first input for receiving an input signal;
a second input for receiving a temperature signal indicative of a temperature;
an output for generating a baseline signal based on the input signal; and
a baseline calculation engine configured to:
generate the baseline signal based on at least one among the input signal and the temperature signal;
calculate an error signal based on a difference of the input signal and the baseline signal; and
modify the baseline signal based on the error signal.
15. The system of claim 14 , the baseline calculation engine further configured to monitor for changes of the phase in the input signal.
16. The system of claim 14 , wherein the error signal is calculated based on a difference between an instantaneous phase of the input signal and an output of a phase integrator.
17. The system of claim 14 , the baseline calculation engine further configured to:
compare the error signal to a threshold; and
reduce a gain factor applied to the error signal in order to calculate the baseline signal if the error signal is greater than the threshold.
18. The system of claim 17 , the baseline calculation engine further configured to control the gain factor based on the temperature.
19. The system of claim 6 , wherein controlling the gain factor based on the temperature comprises controlling the gain factor based on a time rate of change of the temperature.
20. The system of claim 14 , wherein the input signal is generated by a force sensor.
21. The system of claim 20 , wherein the force sensor is configured to sense a force associated with a human interaction with a virtual button.
22. The system of claim 20 , wherein the force sensor comprises one of a capacitive displacement sensor, an inductive force sensor, a resistive-inductive-capacitive sensor, a strain gauge, a piezoelectric force sensor, a force sensing resistor, a thin film force sensor, or a quantum tunneling composite-based force sensor.
23. The system of claim 14 , wherein the input signal is indicative of a phase.
24. The system of claim 14 , the baseline calculation engine further configured to generate a corrected input signal based on the baseline signal and the input signal.
25. The system of claim 14 , the baseline calculation engine further configured to:
modify the baseline signal comprising modifying the baseline signal in accordance with an update frequency; and
set the update frequency based on the temperature.
26. The system of claim 14 , the baseline calculation engine further configured to:
modify the baseline signal by modifying the baseline signal in accordance with an update frequency; and
set the update frequency based on a time rate of change of the temperature.