| 摘要 |
PURPOSE:To easily and surely take the frame synchronization by sending a preamble pattern having a sufficient bit number from the sending side, detecting it at the receiving side, detecting the frame synchronizing pattern to detect the head of the frame and dividing the frame succeedingly. CONSTITUTION:A preamble pattern detection 1 takes bit synchronization in a preamble pattern 1 of a data signal (c) and allows a latch 12 to latch the information as the detection is established when apartial pattern is detected for n-time and its output sets an AND gate 8. The establishment of detection is not attained during the unstable period shown in figure A, but when a frame synchronizing pattern detection section 6 forms the frame synchronizing pattern 2 next, the information is fed to a counter section 10 via the AND gate 8 and the frame is being split afterward in a similar way as a conventional method. |
