| 摘要 |
This circuit is an enhancement of that described in the main patent. Like the latter, it includes a transition selection circuit 20 choosing, from the transitions of the baseband-substituted signal, the transitions separated from those which precede them by a time interval substantially equal to the duration T of a symbol and a time base 10 synchronised by the transition selection circuit 20. There is furthermore provision for a disabling circuit 40 blocking the transition selection circuit 20 upon certain false configurations due to the impairment, by the transmission means, of the shortest T/4 mode pulses whose presence is not revealed in the signal received except by inflections of curvature. <IMAGE>
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