| 摘要 |
<p>PURPOSE:To extract easily a synchronizing signal in the form of CMi code by utilizing a prescribed code rule provided in a CMi (Code Mark invention) code string to select a signal synchronized with original information among two kinds of synchronizing signals. CONSTITUTION:Two-time-slot's share T of original information is observed, then seven kinds of code system string rules are obtained. A CMi signal 1 (CMi-2 or CMi-1) is inputted and a 4-bit shift register 20 is operated by a clock CMCL of the CMi signal. The CMCL is extracted by a tank circuit 13 of low Q. An output of the shift register 20n is decoded by a decoder 21. In decoding the output in accordance only with the decoding rule of the said coding system rule, one side input of an AND circuit 11 attains a signal D1, and other side input is a signal obtained by frequency-dividing the CMi clock signal by a frequency divider 14 by 1/2. That is, any of the clocks CL1 and CL2 is inputted and even when any of them is inputted, the clock CL2 is outputted selectively to an output DO1 of an OR circuit 18 via an integration circuit 12 and an AND circuit 16.</p> |
