| 摘要 |
PURPOSE:To improve the synchronization restoration characteristic and to decrease the worst average synchronization restoration time by providing a synchronization pattern detection circuit simultaneously discriminating coincidence/anticoincidence between r-bits in total arranged at an n-bit period in a received data string and r-kinds of predetermined r-bit synchronization patterns to the title circuit. CONSTITUTION:Received data in 6-bits received from a reception data input terminal 51 and outputted from a shift register 1 at an interval of 772 bits are inputted to an input terminal of a synchronization pattern detection circuit 2 as parallel data. When the 6-bit reception data outputted from the shift register 1 are coincident with any of synchronization pattern among in total 6 kinds of patterns as 001011, and 100101, 110010, 011001, 101100,010110 resulting from bit-shift right of the pattern 001011, an output signal X whose level is '1' representing the coincidence is outputted from its output terminal to a control circuit 3. In the case of anticoincidence, an output signal X whose level is '0' representing the anticoincidence is outputted from its output terminal to the control circuit 3. |
