Abstract: A computer aided coordinate digitizing system is arranged to read data from construction drawings and make construction estimates from the data. A digitizing device determines a series of X-Y coordinate positions on a flat surface by means of a pointer placed at selected positions on the surface and a sensor assembly for detecting the position of the pointer. The device generates X-Y coordinate signals which are transmitted to a computer associated with the device. The computer is programmed to use the received X-Y coordinate signals to perform calculations in response to entry of computer control functions by an operator using a voice recognition unit which converts vocal commands into computer control signals to operate the computer and initiate the selected computer programs for performing construction estimates.

Abstract: The invention relates to a Computer Aided Coordinate Digitizing System for reading plans and calculating desired quantities from the readings. The system includes a digitizing device comprising a sensor assembly adapted to monitor an area in which a plan is placed and a signal generator adapted to generate a signal which is detected by the sensor assembly when it is placed at various positions on the plan. A computer is associated with the digitizing device for storing generated position data and program instructions for carrying out calculations using the data. A control device for operating the computer is adapted to be placed at a predetermined position in the area monitored by the sensor assembly so that the computer can be operated by placing the signal generator at appropriate positions on the control device.