Non-orthogonal demodulation module, touch system and non-orthogonal demodulation method

A touch system, characterized by, comprising:

• a plurality of transmitting electrodes;
• a plurality of receiving electrodes;
• a signal generating module, coupled to the plurality of transmitting electrodes, wherein the signal generating module transmits the plurality of transmitted signals respectively to the plurality of transmitting electrodes in a first time, each of the plurality of transmitted signals has a frequency and a phase, and the plurality of transmitted signals are corresponding to a plurality of frequencies and the plurality of frequencies are different and not zero, and the plurality of transmitted signals are not orthogonal to each other;
• and
• a non-orthogonal demodulation module, coupled to the plurality of transmitting electrodes, wherein the non-orthogonal demodulation module receives a received signal on a first receiving electrode within the plurality of receiving electrodes in the first time;
• the non-orthogonal demodulation module is configured to perform demodulation on the received signal, wherein the received signal is related to a summation of a plurality of transmitted signals, and comprises:
• a mixing-and-integrating unit, configured to perform mixing operations and integrating operations on the received signal respectively at the plurality of frequencies, to generate a plurality of in-phase components and a plurality of quadrature components corresponding to the plurality of frequencies;
• and
• a decoding unit, configured to generate at least a decoding matrix, and compute a plurality of energies corresponding to the plurality of transmitted signals according to the at least a decoding matrix, the plurality of in-phase components and the plurality of quadrature components.

A non-orthogonal demodulation method, applied in a touch system, wherein the touch system comprises a plurality of transmitting electrodes and a plurality of receiving electrodes, characterized by, the non-orthogonal demodulation method comprising:

• transmitting the plurality of transmitted signals respectively to the plurality of transmitting electrodes in a first time, wherein each of the plurality of transmitted signals has a frequency and a phase, and the plurality of transmitted signals are corresponding to a plurality of frequencies and the plurality of frequencies are different and not zero, and the plurality of transmitted signals are not orthogonal to each other;
• receiving a received signal from a first receiving electrode within the plurality of receiving electrodes in the first time;
• performing mixing operations and integrating operations on the received signal respectively at the plurality of frequencies, to generate a plurality of in-phase components and a plurality of quadrature components corresponding to the plurality of frequencies;
• and
• generating at least a decoding matrix, and computing a plurality of energies corresponding to the plurality of transmitted signals according to the at least a decoding matrix, the plurality of in-phase components and the plurality of quadrature components.