| 摘要 |
PURPOSE:To automatize the adjustment for the discrimination of a transmission code by inserting phase and/or level detecting signals to excess bits of the transmission code and controlling the deviations of the discriminated phase and the discriminated threshold level in the reception side in accordance with discrimination results of these detecting signals. CONSTITUTION:In the transmission side, the detecting signal having a width and/or a level different from those of a normal signal is inserted to the excess bits of the trans mission code. In the reception side, the detecting signal is taken out from a discriminator 2 and is supplied to a synchronization detecting circuit 4 as a data signal, and a clock signal is supplied from a timing circuit 3 to the synchronous detecting circuit 4. Error of the discrimination output of the discriminator 2 is detected by a synchronizing and error detecting circuit 41. If detecting lead or delay of the discriminated phase by the discriminator 2, the circuit 41 gives an error signal to a control circuit 42, and the control circuit 42 gives a control signal to a voltage variable delay circuit 33 to adjust the phase of a timing circuit. If the synchronization detecting circuit 4 detects the level error of the discriminated threshold, the control signal is given from the control circuit 42 to the discriminator 2 to adjust the discrimination of level discrimination.
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