Touch controller and associated chip, touch control system and touch control method

A touch controller, configured to determine a position where a user touches a touchscreen, wherein the touchscreen includes a first transmitting electrode, a second transmitting electrode and a receiving electrode, and the touch controller comprises:

• a signal generation module, configured to perform an in-phase code transmission at a first time so that the receiving electrode receives an in-phase code receiving signal correspondingly, and perform an inverting-phase code transmission at a second time so that the receiving electrode receives an inverting-phase code receiving signal correspondingly, wherein when performing the in-phase code transmission, the signal generation module simultaneously generates a first transmitting signal having a first phase and a second transmitting signal having a second phase to the first transmitting electrode and the second transmitting electrode, respectively, and when performing the inverting-phase code transmission, the signal generation module simultaneously generates the second transmitting signal and the first transmitting signal to the first transmitting electrode and the second transmitting electrode, respectively;
• and
• a demodulation module, configured to determine the position where the user touches the touchscreen according to the in-phase code receiving signal corresponding to the first time and the inverting-phase code receiving signal corresponding to the second time.