An improvement in a digitizer for use in computer drafting has been provided wherein a multiple wire connector located in both the X beam and Y beam is held in a taut and concealed condition within the respective beams for any position of the digitizer. An adjustable attachment is provided between the extrusions for the X and Y beam and the respective X and Y guide bars so that the guide bar can be aligned in a straight condition regardless of any warping of the beams during extrusion. A mechani...

Digital readout data of coordinates of points in a two dimensional system is generated in a pair of counters in response to the angular positions of the following: (1) a first disc rotatable in response to movement of a first slider in a straight path to a selected position, and (2) a second disc rotatable in response to movement of the first slider and in response to movement of a second slider in a straight path to a selected position. The second slider is carried from the first slider and arr...

An apparatus for locating a point physically touched and producing an electrical signal corresponding to the location includes an insulating substrate; a resistor touch pattern supported on the insulating substrate; and a protective insulating plate arranged over the resistive touch pattern. The resistive touch pattern has a plurality of strip resistors parallel to a center line; a plurality of linear resistors connected to the strip resistors, the resistance of the linear resistors decreasing w...

The differences between two pairs of the three windings of a synchro stator are individually scaled so as to provide a function of the rotor angle plus a 45.degree. phase lead. The scaled values are applied to a CR/RC bridge, the output of which bears a phase relationship relating directly to the synchro rotor angle, but is identical for shaft angles from 0.degree. to 180.degree. and from 180.degree. to 360.degree.. These signals are shaped and applied to a pulsewidth modulator; the pulsewidth m...

A digitizer arrangement for converting an analogue signal into a digital signal, including a first A/D converter, said first A/D converter being arranged to convert said analogue signal into a first digital signal with a first sampling rate, the first sampling rate being lower than the frequency of the analogue signal, a second A/D converter, said second A/D converter being arranged to convert said high frequency analogue signal into a second digital signal with a second sampling rate, the secon...

A method for producing electronic signals representative of images on a source film includes the following steps: illuminating the film with a light source to obtain an illuminated frame; providing an electronic image sensor; providing a lens array for projecting the illuminated frame on the electronic image sensor, and providing an aperture in conjunction with the lens array for high spatial frequency cutoff in the image; and reading out image representative electronic signals from the electron...

A method of scanning an object includes the steps of: providing a digitizer adapter having at least three markers disposed along a target surface thereof, wherein the digitizer adapter includes a spherical member disposed a predetermined distance at its center point to each of the at least three markers; securing the adapter along an outer surface of the object; creating a plurality of digital images of the object; extracting the coordinates of the at least three markers from the image using pho...

A digitizer interface that translates the digitizer-specific reports into virtual areas of the digitizer which may be divided into specific regions or virtual tablets. Each region permits the specification of individual coordinate systems or stored sequences of commands. The interface may be implemented on a host computer, in the digitizer, or in intermediate electronics. The interface allows reports from digitizers of differing data output formats to be translated into a standard format interna...

An angle digitizer receives signal representing the sine and cosine of the angle to be digitized. The voltages are fed to orthogonal pairs of input terminals. Between each two input terminals is a set of equivalued resistors to form a resistor ring. At the junction of each pair of resistors is an output terminal. Each pair of output terminals is connected to the input terminals of a signal amplitude comparator which compares the magnitude of the signals at its inputs to give a digital signal in ...

Apparatus for providing a digital signal for an aircraft transponder indicating aircraft altitude with a unique sensor forming part of an oscillator, a counter which accumulates counts from the sensor during a predetermined gating period, a ROM which is addressed during a further gating period to apply a sequence of digital numbers to a comparator. The address indicating one thousand foot increments a second counter which receives pulses from the sensor together with the first counter after the ...