Minnesota Mining and Manufacturing Company

Theodore D Klein

Michael R Oran

Circuitry for the validation of repetitive signals including input/output circuitry providing information regarding signals received that is connected to a progammable microprocessor, a read only memory and random access memory. The microprocessor is programmed so the circuitry determines the receipt of an input signal at any one of several signal inputs. When a first signal is received at one of the signal inputs a 'lock-out' time interval is provided during which another signal cannot be received at any signal input. This is followed by a 'window' time interval during which another input signal can be received at the signal input receiving the first signal. A 'lock-out' and a 'window' time interval are provided for each signal received at the signal input during a 'window' time period at which the first input signal was received. Such signals are counted until a predetermined count is reached thereby establishing the received signals as valid signals. A new count is required is a 'window' time interval is provided and a signal is not received at the proper input during such time interval.

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Waconia, MN, United States of America

Theodore D Klein