Patent ID: 8965735
Filing Date: 2015-02-24
Classification: G06F

Abstract:
1. A signal processing device, comprising: a first signal processing unit; a second signal processing unit; a third signal processing unit, wherein each signal processing unit is designed to output mutually corresponding output signals in response to mutually corresponding input signals; and a safety unit; wherein the first signal processing unit and the second signal processing unit are operable in parallel for providing signal processing redundancy and are interconnectable to form a redundancy block; wherein the first signal processing unit, the second signal processing unit, and the third signal processing unit are connected to the safety unit while the third signal processing unit is in testing; wherein the third signal processing unit, when connected to the safety unit during the testing, is located outside of a safety chain of the first signal processing unit and the second signal processing unit; wherein the safety unit is designed to successively replace in each case the first signal processing unit or the second signal processing unit with the third signal processing unit in order to perform checking of an output response signal of the particular freed-up signal processing unit with respect to a reference value in response to a test input signal according to a predetermined test pattern, wherein the checking uses at least one of i) a test device and ii) a diagnostic device; and wherein the particular freed-up signal processing unit becomes the third signal processing unit and if the output response signal of the third signal processing unit corresponds to the expected response signal for the predetermined test pattern, the functionality of the third signal processing unit is classified as correct and either the first signal processing unit or the second signal processing unit is then replaced with the third signal processing unit.