| 摘要 |
<p>PURPOSE:To eliminate a shift of period in case a difference is produced between the clock of a transmitter and the clock of a shaping device for transmission line and a shift is caused in the synchronism of a signal after shaping, by giving a delay to the signal and selecting a proper delayed output when a shift of period is detected with elimination of the noise that is produced from the selection of the delayed output. CONSTITUTION:The signal given from a transmitter undergoes shaping in pulse width and is fed to an input terminal 11 of a correcting circuit 10. A shift register 12 delays the signal of the terminal 11 and has plural delayed outputs Q0,...,Qn. One of these delayed outputs is selected by a multiplexer 13 and delivered. In this case, if a shift of period occurs when the period is shortened, this shift is detected by a deciding circuit 16. Then the multiplexer 13 is controlled to select another output as a delayed output of the register 12. As a result, a spikelike noise is produced, and this noise is eliminated by a spikelike noise signal eliminating circuit 15.</p> |
