Information transmission method, and apparatus

An information transmission method, applied to a system that includes a stylus and an electronic device, wherein the stylus comprises a first electrode and a second electrode, and the method comprises:

• sending, by the first electrode, N first signals based on a refresh rate, wherein the N first signals correspond to N sending moments, and N is an integer greater than or equal to 1;
• sending, by the second electrode, M second signals based on a pressure sensing value detected by the stylus or a type of an operation performed by a user on the stylus, wherein the M second signals correspond to M sending moments, the M sending moments overlap some or all of the N sending moments, and M is an integer less than or equal to N;
• receiving, by the electronic device, the first signal and the second signal;
• at a first moment, based on the electronic device determining that the first signal exists but the second signal does not exist, recording, by the electronic device, a first value;
• at a second moment, based on the electronic device determining that the first signal exists and the second signal exists, recording, by the electronic device, a second value, wherein the first moment or the second moment is any moment in the N moments;
• and
• obtaining, by the electronic device, target coding data based on the first value and/or the second value recorded at the N moments, wherein the target coding data represents the pressure sensing value or the type of the operation performed by the user on the stylus.