| 摘要 |
<p>PURPOSE:To reproduce block synchronism with high accuracy at high speed by canceling the scramble of a code word by adding a pseudo random sequence, and establishing the block synchronism by decoding the canceled code word. CONSTITUTION:A block synchronism reproducing circuit 106 performs block synchronism reproducing with received data (a) and a block (b). Namely, when the end of a most certain BIC(block synchronism identification code) detecting position is recognized, a BIC detect signal (c) is outputted to a PN signal generating circuit 108. The signal generating circuit 108 outputs a PN signal (h) to an XOR circuit 110. The circuit 110 outputs descrambled data to a delay circuit 112 by exclusively ORing the received data (a) and the PN signal (h). When the code word in the received data (a) is written onto a frame memory 114 by this procedure, first lateral decode processing is performed by a decoding circuit 116. This operation is controlled by a control circuit 118, the decoding circuit 116 outputs a signal (d) to the reproducing circuit 106, and a decode end signal S is outputted.</p> |
