| 摘要 |
PURPOSE:To correct automatically the change in group delay distortion of a transmission line by allowing a signal detection circuit detecting the presence of a reception signal to control a switch circuit and a both switches connecting or opening an output of integration. CONSTITUTION:A reception signal fed from an input terminal 1 is fed to a pattern detector 4 detecting a pattern, an error detector 5 detecting the polarity of phase error information as an error signal and a signal detector 6 detecting the presence of a reception signal. A storage device 7 stores an error signal from the error detector 5, a pattern detector 4 uses the error signal stored only when a specific pattern is detected as the 1st input to a switch 8, its output is fed to a 1st integration device 9 and smoothed. One output of the integration device 9 is given to the 1st input of a switch 12 and the other is given to a switch circuit 10. This output is fed to a 2nd integration device 11 holding the output of the integration device 9. With the output of the signal detector 6, that is, the presence of the signal, the output of the 1st integration device 9 or the 2nd integration device 11 is outputted from a terminal 3 by the switch 12. |
