Patent ID: 8743080

Claim:
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.