Orthesis or prosthesis system and method for open-loop or closed-loop orthesis or prosthesis control

An orthosis or prosthesis system, comprising:

• at least one orthosis or prosthesis;
• at least one pair of electrodes as an electrode pair configured for contacting a body of a user of the respective orthosis or prosthesis for detecting muscle-related signals;
• at least one evaluation unit for muscle-related signals detected by the at least one electrode pair;
• at least one actuator for moving the respective at least one orthosis or prosthesis;
• at least one control unit for controlling the at least one actuator;
• wherein the at least one electrode pair is configured to detect at least a first muscle-related signal using a first measurement frequency and a second muscle-related signal using a second measurement frequency;
• wherein the at least one evaluation unit is configured to:
• evaluate a phase of the first signal and a phase of the second signal;
• compare a phase of the first signal to a reference phase in order to ascertain a first phase change;
• compare a phase of the second signal to the reference phase in order to ascertain a second phase change;
• evaluate the first phase change and the second phase change.