| 摘要 |
<p>PURPOSE:To enable to surely detect the produced location of special signal at the reception side, by the transmission with the code of different code system in which the special signal such as frame synchronism signal and data signal can independently be identified. CONSTITUTION:A shift register 12 and an exclusive logical sum gate 11 constitute a virtual random pattern generating circuit, and the virtual random pattern train is fed to an exclusive OR gate 14 via an inhibition gate 13 when the output signal (a) of the timing generating circuit 16 is ''0'', that is, other than the produced location of the frame synchronizing signal, and the input pulse train S7 from the input pulse train generating circuit 15 is scrambled with the virtual random pulse train and fed to the code conversion circuit 17. If (a) is ''1'', the inhibition gate 13 is off, and the virtual random pulse train is not fed to the exclusive OR gate 14 but fed to the circuit 17.</p> |
