Capacitive measurement system with increased robustness against electro-magnetic interference
First Claim
Patent Images
1. A method for capacitive sensing, said method comprising the steps ofgenerating a control signal and supplying said control signal to a transmitter, said control signal causing said transmitter to generate a transmitting signal;
- detecting a response signal, said response signal being responsive to a transfer behaviour of a transfer channel for said transmitting signal;
determining at least one characteristic of said transfer behaviour from said response signal;
said method further comprising the further steps of;
tagging said transmitting signal by modulating a sub-carrier signal on said transmitting signal;
validating the result of said determining step by demodulating said sub-carrier signal out of said response signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for capacitive sensing comprises the steps of tagging a transmitting signal by modulating a sub-carrier on said signal using state of the art modulation techniques; demodulating said subcarrier out of useful/received signal to prove validity of said signal.
-
Citations
17 Claims
-
1. A method for capacitive sensing, said method comprising the steps of
generating a control signal and supplying said control signal to a transmitter, said control signal causing said transmitter to generate a transmitting signal; -
detecting a response signal, said response signal being responsive to a transfer behaviour of a transfer channel for said transmitting signal; determining at least one characteristic of said transfer behaviour from said response signal; said method further comprising the further steps of; tagging said transmitting signal by modulating a sub-carrier signal on said transmitting signal; validating the result of said determining step by demodulating said sub-carrier signal out of said response signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for capacitive sensing, said method comprising the steps of
generating a carrier signal generating a first sub-carrier signal, supplying said carrier signal and said first sub-carrier signal to a first modulator, and supplying the output signal of said first modulator as a first control signal to a transmitter, said first control signal causing said transmitter to generate a first transmitting signal; -
detecting a first response signal, said first response signal being responsive to a transfer behaviour of a transfer channel for said first transmitting signal; determining at least one characteristic of said transfer behaviour from said first response signal; said method further comprising the further steps of validating the result of said determining step by generating a second sub-carrier signal, supplying said carrier signal and said second sub-carrier signal to said first modulator, and supplying the output signal of said first modulator as a second control signal to said transmitter, said second control signal causing said transmitter to generate a second transmitting signal; detecting a second response signal, said second response signal being responsive to a transfer behaviour of said transfer channel for said second transmitting signal; determining at least one characteristic of said transfer behaviour from said first response signal; demodulating said sub-carrier out of said second response signal; and determining at least one characteristic of said transfer behaviour from said demodulated second response signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
Specification