Method for operating an internal combustion engine having at least one combustion chamber and internal combustion engine for carrying out such a method

An internal combustion engine, comprising:

• at least one combustion chamber;
• at least one ignition device connected to the at least one combustion chamber;
• and
• a controller operably connected to the at least one ignition device, the controller being configured for:
• detecting a structure borne sound signal in a time-dependent manner for the at least one combustion chamber during operation of the internal combustion engine;
• determining, in a predetermined measuring window, at least one evaluation parameter from the detected structure borne sound signal, the at least one evaluation parameter including:
• a temporal length of a signal curve progression, the temporal length, which is irrespective of an output wave of a cylinder internal pressure sensor, being associated with a single sensor for detecting the structure borne sound signal and being calculated as a difference between a second time index value and a first time index value;
• obtaining at least one comparative result by comparing the at least one evaluation parameter with at least one predetermined comparison value;
• and
• assigning to the structure borne sound signal, on the basis of the at least one comparative result, one of a knocking event in the at least one combustion chamber and an interference signal.