MONITORING OF TRIPLE REDUNDANT CIRCULAR DATA

The voter circuit and method determines a voted output among plural inputs each carrying circular data. To supply the voted output, a statistical average (e.g., mean or median) is computed by grouping the plural inputs into pairs, and for each pair generating a minimum angular difference by selecting the minimum of (a) the absolute difference between the pairs of inputs, and (b) the conjugate of the absolute difference between the pairs of inputs. The voted output is a statistical average generated from the minimum angular difference. The monitor circuit and method assesses validity among the plural inputs by comparing inputs in pairs, two-by-two, generating for each pair a minimum angular difference and comparing the difference to a threshold and persistence time is confirmed. The monitor declares an input invalid that is in disagreement with all other inputs paired against it.