| 摘要 |
PURPOSE:To utilize a communication line effectively by providing plural conversion mode selection circuits, data comparison circuits, error counters and coincidence discrimination circuits or the like so as to apply the twice selection and comparison simultaneously by reducing the time for removing uncertain events. CONSTITUTION:One of 4 code conversion modes from a code conversion circuit 1 is selected by a conversion mode selection circuit 51, compared with a data from a pattern generating circuit 2 by a data comparison circuit 61. Moreover, the other set of conversion mode of the circuit 1 is selected by a conversion mode selection circuit 52 and compared with the data from the circuit 2 by the data comparison circuit 62. Then outputs of the circuits 61, 62, the number of dissident pulses is counted by error counters 31, 32, inputted to a conversion mode selection circuit 53 via coincidence discrimination circuits 41, 42 and the signal of the coincident data is selected. If the result of discrimination of the circuits 41, 42 represents dissidence, the correct mode is selected via an AND circuit 8 and a 1/2 frequency circuit 9 or the like to reduce the removal time of uncertain event thereby utilizing the communication line effectively. |
