| 摘要 |
<p>PURPOSE:To automatically set a proper slice level by defining the amplification factor of an amplifier means and the output voltage of a voltage generating means as the amplification level and the slice level of each signal respectively when the output voltage of the amplifier means exceeds the output voltage of the voltage generating means. CONSTITUTION:The voltage Vh obtained by amplifying the signal output by an amplifier means 11 is inputted to a comparison means 13 together with the output voltage Vs of a voltage generating means 12. The means 13 compares the levels of the Vh and Vs with each other and informs a control means 14 of the result of this comparison. The means 14 sends the control signals to both means 11 and 12 to increase the Vh and to reduce the Vs respectively when the Vh is smaller than the Vs. Then the means 14 discontinues the transmission of the control signals when the Vh exceeds the Vs. At this time point, both the Vh and the Vs are fixed. Therefore the Vs is automatically set at a level slightly lower than the Vh. As a result, a proper slice level is automatically set.</p> |
