Patent ID: 9690399
Date: 2017-06-27
CPC Classifications: G06F

Claim:
1. A signal decoding and modulation processing system for a capacitive stylus, comprising: a micro controller unit; and a digital processing unit, electrically connected with the micro controller unit, wherein the digital processing unit comprises: a decoding module, configured to decode an input signal from a touch panel so as to correspondingly generate a decoded input content, and the decoded input content is transmitted to the micro controller unit, wherein the micro controller unit generates a feedback data according to the decoded input content; and a modulating module, configured to receive the feedback data from the micro controller unit and perform a modulation process accordingly so as to generate a differential binary phase shift keying (DBPSK) output signal, which is sent back to the touch panel; wherein the decoding module comprises: a shift register, configured to receive the input signal from the input of the decoding module, and receive a clock signal from the micro controller unit; and a direct sequence spread spectrum (DSSS) code, wherein the shift register performs XOR operation and summation operation with the DSSS code, in order to correspondingly generate an operation result.