| 摘要 |
PURPOSE:To measure accurately error number in the longest series by adding an exclusive OR circuit to correct an error in the inputted longest series. CONSTITUTION:When an erroneous signal exists at an input terminal 7 and DFF1-4 have no error, an input of an exclusive OR circuit 6 goes to logical 1. Then the added exclusive OR circuit 10 acts like inverting a signal at the input terminal 7 and inputting it to the DFF1. Since the signal at the input terminal 7 is in error, the inversion means that the error is corrected. Thus, no error appears at the output of the DFFs 1-4 and an erroneous output goes to logical 0 at a point of time other than the presence of the error at the input terminal 7. Since the erroneous output goes to logical 1 only at a one point of time to one input error, the number of errors is measured accurately. |
