| 摘要 |
PURPOSE:To compensate a variation of a signal level, by sampling and holding a voltage level of the demodulated signal by a keyed pulse, and making a slice voltage or a white black inverting voltage level by this hold voltage level. CONSTITUTION:A facsimile signal applied to the terminal 1 goes into the slice and white black inverting circuit 4 through the AGC circuit 2 and the demodulation circuit 3. A keyed pulse from the control circuit 11 smaples a center level of the phase signal by a switch 6, and holds it by the hold circuit 7. An output of the hold circuit 7 is provided to the changeover circuit 8, which is closed by selecting the terminal 12 or 13 by the slice from the control circuit 11 or the instruction of inversion. Thus, the terminal 12 or 13 can be selected properly in accordance with a level change of the input signal. |
