Touch sensitive apparatus, method and touch system for receiving signal value

A touch system, comprising:

• a touch panel;
• and
• a touch sensitive processing apparatus, comprising:
• a sensing circuit module for connecting multiple touch electrodes of the touch panel in order to detect electrical signals emitted from a transmitter, wherein the electrical signals carry a message representing a signal value;
• and
• a processor module, coupled to the sensing circuit module, configured for executing instructions stored in non-volatile memory for realize following:
• having the sensing circuit module sensing a first characteristic value of the electrical signals received in a reference signal time period;
• having the sensing circuit module sensing a second characteristic value of the electrical signals, having a first number of waves, received in a first modulation signal time period;
• having the sensing circuit module sensing a third characteristic value of the electrical signals, having a second number of waves, received in a second modulation signal time period;
• calculating a first ratio of the second characteristic value and the first characteristic value and calculating a second ratio of the third characteristic value and first characteristic value;
• and
• calculating the signal value according to a function of the first ratio, the second ratio, the first number of waves and the second number of waves.

A touch sensitive processing method for receiving a signal value, comprising:

• sensing a first characteristic value of the electrical signals received in a reference signal time period;
• sensing a second characteristic value of the electrical signals, having a first number of waves, received in a first modulation signal time period;
• sensing a third characteristic value of the electrical signals, having a second number of waves, received in a second modulation signal time period;
• calculating a first ratio of the second characteristic value and the first characteristic value and calculating a second ratio of the third characteristic value and first characteristic value;
• and
• calculating the signal value according to a function of the first ratio, the second ratio, the first number of waves and the second number of waves.