System and method for energy efficient measurement of sensor signal
First Claim
1. A method for improving robustness of a capacitive sensor system, said method comprising the steps of:
- a) operating the capacitive sensor system wherein received discrete sensor signals are filtered by a band-pass filter having a band-pass having a first center frequency;
b) polling subsequent discrete sensor data at a first polling rate using the sensor system, wherein a sensor state is determined to be off when a received sensor signal is below a predetermined threshold and the sensor state is determined to be on when the received sensor signal is above the predetermined threshold;
c) determining whether a polled discrete sensor value with respect to a previous discrete sensor value is transitioning from a first state to a second state or from a second state to a first state;
d) upon determining a transition;
d1) polling subsequent discrete sensor data at a second polling rate being higher than the first polling rate using the sensor system for a predetermined time period;
d2) verifying during the predetermined time period that the subsequent discrete sensor data polled at the second polling rate are consistent;
d3) upon verifying that the subsequent discrete sensor data polled at the second polling rate are inconsistent, repeating at least step d2) wherein said band-pass filter is controlled to have a second center frequency and when it is determined that the subsequent discrete sensor data polled at the second polling rate are consistent continuing with step b).
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Accused Products
Abstract
A method for improving robustness of a capacitive sensor system has the following steps: a) operating the capacitive sensor system, wherein received sensor signals are filtered by a band-pass filter having a band-pass having a first center frequency; b) polling sensor data at a first rate using the sensor system; c) determining whether a polled sensor value is meeting a predetermined threshold; d) if the predetermined threshold is met: d1) polling sensor data at a second rate being higher than the first rate using the sensor system; d2) verifying that sensor data polled at the second rate are consistent; d3) if the sensor data polled at the second rate are inconsistent, then repeating at least step d2) wherein said band-pass filter is controlled to have a second center frequency.
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Citations
24 Claims
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1. A method for improving robustness of a capacitive sensor system, said method comprising the steps of:
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a) operating the capacitive sensor system wherein received discrete sensor signals are filtered by a band-pass filter having a band-pass having a first center frequency; b) polling subsequent discrete sensor data at a first polling rate using the sensor system, wherein a sensor state is determined to be off when a received sensor signal is below a predetermined threshold and the sensor state is determined to be on when the received sensor signal is above the predetermined threshold; c) determining whether a polled discrete sensor value with respect to a previous discrete sensor value is transitioning from a first state to a second state or from a second state to a first state; d) upon determining a transition; d1) polling subsequent discrete sensor data at a second polling rate being higher than the first polling rate using the sensor system for a predetermined time period; d2) verifying during the predetermined time period that the subsequent discrete sensor data polled at the second polling rate are consistent; d3) upon verifying that the subsequent discrete sensor data polled at the second polling rate are inconsistent, repeating at least step d2) wherein said band-pass filter is controlled to have a second center frequency and when it is determined that the subsequent discrete sensor data polled at the second polling rate are consistent continuing with step b). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A capacitive sensor system comprising:
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a capacitive sensor electrode arrangement; a band-pass filter receiving discrete sensor signals from said capacitive sensor electrode arrangement, wherein the band-pass filter having a band-pass with a first center frequency; an evaluation unit configured; to poll discrete sensor data at a first polling rate using the capacitive sensor electrode arrangement, wherein a sensor state is determined to be off when a received sensor signal is below a predetermined threshold and the sensor state is determined to be on when the received sensor signal is above the predetermined threshold; determine whether a polled sensor value with respect to a previous discrete sensor value is transitioning from a first state to a second state or form the second state to the first state and upon determining a transition; to poll discrete sensor data at a second polling rate being higher than the first polling rate using the sensor system for a predetermined time period; to verify during the predetermined time period that discrete sensor data polled at the second polling rate are consistent and upon verifying that the discrete sensor data polled at the second rate are inconsistent, to control the band-pass filter to switch to a second center frequency and when it is determined that the subsequent discrete sensor data polled at the second rate are consistent continuing to poll discrete sensor data at the first polling rate. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for operating a portable device with a capacitive sensor system, said method comprising the steps of:
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a) switching the device into a low power mode; b) operating the capacitive sensor system at a first frequency, wherein received sensor signals from the reception electrode are filtered by a band-pass filter having a band-pass matching said first frequency; c) polling sensor data at a first rate using the sensor system operating at the first frequency; d) determining whether a polled sensor value is meeting a predetermined threshold; e) upon determining that the predetermined threshold is met; e1) polling sensor data at a second rate being higher than the first rate using the sensor system operating at the first frequency for a predetermined validation period; e2) verifying during the predetermined validation period that sensor data polled at the second rate are consistent; e3) upon verifying that the sensor data polled at the second rate are inconsistent, then repeating at least step e2) wherein the sensor system is operated at a second frequency and said band-pass filter is controlled to match said second frequency; f) upon verifying in step e3) that the sensor data polled at the second rate are consistent, then switching the portable device from a low power mode into a normal operating mode.
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Specification