Capacitive multi-touch system and method of controlling the same

A method of controlling a capacitive multi-touch system, the method comprising:

• generating a capacitance signal corresponding to an input touch;
• converting the capacitance signal to a sensing channel signal;
• analyzing a noise spectrum of a common voltage (VCOM) to generate a filter selection signal;
• performing a filtering operation on the sensing channel signal using a noise filtering operation selected by the filter selection signal.

A capacitive multi-touch system, comprising:

• a display device configured to operate using a common voltage;
• a touch sensor panel disposed on the display device and configured to generate a sensing input signal corresponding to a touch input;
• and
• a digital signal processor configured to analyze noise characteristics of the common voltage and perform a noise filtering operation on the sensing input signal based on the noise characteristics.