Capacitive touchscreen device with multi-touchscreens

Device with touchscreen comprising at least two matrix touch pads, each touch pad comprising a plurality of conducting rows and of conducting columns, the said pads being connected to an electronic assembly comprising means for emitting and for receiving electrical signals from periodic measurements, the emission means generating at least one first emission signal at a first frequency intended for the first touch pad and a second emission signal at a second frequency intended for the second touch pad, the receiving means being arranged so as to process a received signal comprising the first frequency and the second frequency, in which

• a first period equal to the inverse of the said first frequency being associated with the first frequency, a second period equal to the inverse of the said second frequency being associated with the second frequency, the values of the frequencies are such that there exist two integer numbers that are non-multiples of each other such that the product of the first integer number with the first period is equal to the product of the second integer number with the second period, and
• the receiving means comprise a synchronous amplitude demodulation arranged in such a manner as to perform the multiplication of the received signal with four different sine and cosine periodic functions, the first two functions being at the first frequency and the second two functions being at the second frequency, the four multiplied signals obtained being integrated over an identical period of time corresponding to the said product, the signals thus integrated being representative of a first received signal at the first frequency and only at the first frequency and of a second received signal at the second frequency and only at the second frequency.