| 摘要 |
<p>PURPOSE:To remove secondary coordinates generated in the circumference of a writing pressure applied point, and to transmit a satisfactory reproducing picture by transmitting only writing pressure point coordinates corresponding to a point where writing pressure exceeding prescribed writing pressure has been applied, when reproducing a writing picture in accordance with a signal corresponding to the writing pressure point coordinates. CONSTITUTION:Horizontal and vertical electrode groups 2, 1 of a pressure sensor type blackboard 10 are connected to Y and X coordinate switching circuits 12, 11, respectively, and the circuits 11, 12 are scanned by a control signal from a scanning controlling circuit 13. Writing pressure put on this blackboard 10 is detected by a writing pressure maximum point detecting circuit 15 through the circuit 11, and is supplied to a microcomputer 16. An output from this computer 16 is provided to the circuit 13 and a storing circuit control part 18 for controlling a storing circuit 19 and 20, through a control logic 17. Subsequently, only writing pressure point coordinates corresponding to the point where writing pressure exceeding prescribed writing pressure has been applied are transmitted to a display part 23 through a telephone line L via a transmitting part 21, from the computer 16, and secondary writing pressure point coordinates generated in the circumference of the writing pressure applied point are removed.</p> |
