| 摘要 |
PURPOSE:To correct uncertainty of phase between a decoded signal and its clock signal by outputting a signal from which a unique word pattern is detected in two decoded biphase signals as a correct signal. CONSTITUTION:A timing signal 2 having a period T/2 extracted from a biphase coding signal 1 is divided into two by a frequency division circuit 3 in the burst TDMA system and clock signals 4, 5 having a phase difference T/2 are outputted. The signal 1 is set DFF6, 7 by using the signals 4, 5 to output decoded signals 8, 9, which are inputted respectively to unique word UW pattern detecting circuit 12 and delay circuits 10, 11. The phase of the signals 4, 5 and 8, 9 is uncertain at each burst and the circuit 12 outputs signals 13, 14 corresponding to the signals 8, 9 to a switch control circuit 15 while taking a signal where a correct UW pattern exists in the signals 8, 9 as a correct decoding signal. The signals 8, 9 delayed by the operating time of the circuit 12 is inputted to a switch circuit 18, selected by the control signal of the circuit 15 and outputted together with the clock signal. |
