Signal processing device and control unit for cooperating with a signal processing device

A control unit for cooperating with a signal processing device including at least one filter having a property influenceable by control information, the control information being checked and an alternate measure being taken if the check reveals that the control information is incorrect, the control unit comprising:

• an arrangement for receiving a measurement message of the signal processing device, the measurement message containing information derived from a knocking signal;
• an arrangement for checking the measurement message for errors and initiating the alternate measure in the event of an error;
• and
• an arrangement for generating and outputting the control information to the signal processing device.

A signal processing device for processing a knocking signal of an internal combustion engine provided by a knocking sensor, comprising:

• an interface to receive control data, including filter coefficients;
• a memory to store the filter coefficients;
• a filter to receive the filter coefficients and to filter, based on the filter coefficients, a received knocking sensor signal;
• and
• a processing device to check the filter coefficients stored in memory for errors, and responsive to detecting a quantity of errors, causing a correction mechanism to activate.