SU465636A1 - Device for displaying graphic information on the screen of a cathode ray tube - Google Patents

Description

I

The invention relates to the field of automation and computer technology and can be used in the construction of indicators on a cathode ray tube.

A device for constructing graphic information on a screen of a cathode ray tube is known, comprising a serially connected data processing unit, a control register, a reversible counter, and a digital-to-analog converter of the X coordinate and a cathode-ray tube, as well as a Y coordinate register connected via a digital-to-analog converter of the Y coordinate to the cathode ray tube.

The proposed device is characterized in that it introduces delay and correction blocks connected to the data processing unit and the coordinate register Y, the outputs of which are connected to the inputs of the correction unit.

This simplifies the device.

Pa drawing shows the block diagram of the device.

The device contains data processing units 1, correction 2 and delay 3, register 4 coordinates Y, digital-to-analog converters of coordinates X 5 H Y Q, reversible counter 7 coordinates X, control register 8 and electron beam tube 9.

The device works as follows.

From block I of processing data into blocks

Corrections 2 and Delays 3 receive (k +) low-order bits of the coordinate of the next displayed point, to the second inputs of the correction block - (+1) lower-order coordinate bits of the previous displayed point from register 4. As a result of the comparison, the correction block produces sigals corresponding to logical combinations of 0.1; 1.0; 0.0 A logical combination of control signals 0.1 results from the conjunction of the inverse value of the (y + 1) -th bit of the next value of the Y coordinate, the direct value of the (k + l) -To bit of the previous value of the Y coordinate and the comparison signal of the two k- bit words (low order bits), which takes a value equal to "1 if the next k-bit word is greater than the previous one. Otherwise, this signal takes the value corresponding to a logical zero. The logical combination of the control signals 1.0 is formed as a result of the conjunction of the direct value (fe-f 1) -th bit of the subsequent value of the Y coordinate, the inverse value (+1) -th bit of the previous value, and the inverse value of the specified comparison-bit signal single numbers. In all other cases, a logical combination of 0.0 occurs. Control signals from the outputs of the correction unit are fed to the inputs

The {th + 2) -gb bit of the register of the x coordinate. When the control combination of 0.1 is created, the unit is added, with the combination of 1.0, the unit is subtracted, and with the combination of 0.0, the content of the higher bits of the displayed Y remains without changes.

The corresponding value of the subsequent coordinate A is generated on the reversible counter 7 of the X coordinate by adding or subtracting the least significant unit from the control register 8. The outputs of the Y coordinate register and the reversible counter of the X coordinate are connected to the corresponding digital-to-analog converters of the X 5 and Y 6 coordinates, which control the currents of the deflection coils of the cathode ray tube 9.

Subject invention

Device for displaying graphical information on the screen of the electron beam

tubes containing a serially connected data processing unit, a control register, a reversible counter, and a digital-to-analog converter, X coordinate and electron-beam tube, as well as a Y coordinate register, connected through a digital-to-analog coordinate converter Y to an electron beam tube, characterized in that, in order to simplify, the device It contains the delay and correction blocks connected to the data processing unit and the Y coordinate register, whose outputs are connected to the inputs of the correction block.

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