| 摘要 |
PURPOSE:To correctly binarize a base band signal by detecting the center potential of the base band signal for a short pulling-in period of time with a simple circuit constitution. CONSTITUTION:A preamble pattern where data '1' and '0' alternately appear is preliminarily used for pulling-in, and a base band signal (a) of this pattern is differentiated by a differentiating means 21. The timing of the center potential of the base band signal (a) is detected based on phase information of the preamble pattern by a first comparator 22, a resistance 23, delay circuits 24 and 26, and a D-FF 25, and the center potential of the base band signal (a) is held by a switch 27, a capacitor 28, and high input impedance buffer 29. The base band signal (a) is binarized with the center potential as a threshold value by a comparator 30. |
