| 摘要 |
PURPOSE:To enable to automatically give a notice when an original is being turned over transmitted, by giving an alarm if no changing point of white/black is observed until the end of a transmission. CONSTITUTION:The reference value of white/black changing point of one line unit is preset to the counter 2, and that of one original unit is preset to the counter 3. The counter 2 counts the number of white/black changing points produced from the video signal from the original, and if it is greater than the reference value, ''1'' is output to the counter 3. The counter 3 counts the number of ''1'' produced with the counter 2 and compares it with the reference value. In case of turned over state, taking a notice that the number of white/black changing points is less, the flip-flop 4 is set and external display for turn over feed of the original is made to the alarm display section 6 in the timing of original read-in end signal. |
