| 摘要 |
PURPOSE:To make a large capacity counter unnecessary, by making a keyed signal based upon every rise point of the blanking signal, in case the keyboard AGC is carried out in the facsimile device whose main scanning is made by a drum rotation. CONSTITUTION:At the first stage of communication, the position relation of a transmission side phase signal and a blanking signal is measured by CPU40, the counter 41 and the operation circuit 43, and the number of clock pulses showing the width from the extreme point of the blanking signal to that of the keyed signal is obtained based upon the aforesaid measuring result. After that, when the counter 41 has counted the number of clock pulses mentioned above, such number as makes the counter 41 overflow is set to ROM44. Resulting from the foregoing, counting is made from a rise point of the blanking signal, and the moment when the counter 41 has overflowed becomes a rise time of the keyed signal. From the aforesaid moment, counting is started by the counter 42, and its overflow moment becomes a breaking moment of the keyed signal. In ROM44, such a numerical value as overflows in case the counter has counted by the fixed number is set beforehand. |
