| 摘要 |
<p>PURPOSE:To simplify the constitution of a system, by linearly scanning an electrode group arrayed like a matrix, detecting the first writing pressure point co- ordinates, then, partially scanning a prescribed range containing its writing pressure co-ordinates, and transmitting the detected co-ordinates by use of a public telephone line. CONSTITUTION:Horizontal and vertical electrode groups 1, 2 of a pressure sensor type blackboard 10 are connected to Y and X co-ordinate switching circuits 12, 11, respectively. These circuits 11, 12 are secanned by a control signal from a scanning controlling circuit 13, an output of a point onto which writing pressure has been put is provided to a writing pressure maximum point detecting circuit 15 through an A/D converting part 14 from the circuit 11, and a detecting output of this circuit 15 is provided to a microcomputer 16. Subsequently, an output of the computer 16 is decoded by a control logic 17, and the circuit 13 or a storing circuit control part 18 for controlling a storing circuit 19 and 20 are controlled. In this way, after the writing pressure point co-ordinates is detected at first, a prescribed range containing its co-ordinates is partially scanned, the detected co-ordinates are transmitted by use of a public telephone line L, and the constitution of a system is simplified.</p> |
