According to Tianyancha's property clue information, Huawei Technologies Co., Ltd. recently published a patent for a "signal processing method and related device". The abstract shows that the application is applied to the field of brain-computer interface (BCI) technology, including: obtaining a first signal, which is a signal collected from brain tissue, and obtaining a downstream feedback signal, and then processing the first signal according to the feedback signal. This method processes the first signal collected from brain tissue by combining the feedback signal, rather than directly inputting the first signal into the decoding device for decoding, thereby ensuring the long-term stability of signal encoding and decoding, and avoiding the long-term stability of signal encoding and decoding from decreasing or even failing due to the non-stationarity of the signal.