SU731446A2 - Device for displaying graphic information on crt screen - Google Patents

Description

The drawing shows a diagram of the device.

The device contains an input register /, a generator of 2 characters, a block 5 except (a beam RTK that stores CRT 4, a converter 5 is an analog code, a recording amplifier 6, a gating block 7, a raster scan generator 8, a bright CRT 9, a read amplifier 10, the first a decoder //, a 12-step voltage generator, a second decoder 13. A decoder // is a chroma decoder, and a decoder 13 is a decoder for the “Stoicad.

The device works as follows.

The input of the input register / digital signals are received from a computer or operator's console. From the first exit, they remove the digital codes of symbols, their coordinates and the commands “Stop frame. In accordance with the code of symbols and their combination, the generator of 2 symbols produces analog voltages arriving on the beam sweep unit 3, the tilting sighting beam of the storage electron-beam tube 4.

The codes of symbols and coordinates do not cause the occurrence of a signal at the output of the decoder of the “Stopnkadr” command, since it responds only to the effect of the “Stop-frame. From the second output of the input register 1, a digital color code is fed to the converter 5, a code analog, the output of which through a recordable recording amplifier enters the illumination of the recording beam of the storage cathode ray tube 4. Recording amplifier 6 is opened for the illumination signal to pass through the strobe coming from block 7 strobing, which produces a strobe signal synchronization with the third output of the input register /. To deploy the electron beam to read the storage cathode ray tube 4, the fourth input of the beam receives raster scan voltages from the raster scan generator 8, from which also the scan voltages are removed to the color cathode ray tube 9. Readable from the target is stored; The beam tube 4 is fed to a read amplifier 10, the transmission coefficient of which is controlled by the voltage from a 12-step voltage generator. The latter is synchronized by pulses from the input register / and the generator 8 of raster sweeps. From the output of the amplifier 10, the video signal is fed to the color decoder 11 and then to the color cathode ray tube 9, on the screen of which the image of the output data is reproduced. In the normal mode of operation of the display device, digital codes from a computer to the input

l

With a period equal to two periods of the frame sweep of the read beam (for example, lr read and raster television standard, the duration of which is 40 ms, the duration of the data entry period is 80 ms). The double-beam storage electron-beam tube 4 in this case operates in the periodic recording mode in accordance with the input

digital codes and simultaneous continuous reading with erasing by the read beam.

The gating unit 7 synchronized by the signal from the input register L periodically opens the recording amplifier 6 for passing the light pulses of the recording beam of the recording electron-beam tube 4. A 12-step voltage generator synchronized by the signals "input of information from the input register / and return pulses of the half-frames (with interlaced scanning ) from the generator 8 raster sweeps, continuously changes the transfer coefficient of the read amplifier W according to the law, the opposite of the attenuation law of the read sy in this mode of operation of the CRT 4. All this allows to obtain at the output of the display device undistorted color indication of dynamic information. In order to obtain a static image, the device is transferred to the freeze frame mode. This is accomplished through a digital "command og received at the input register of the computer or operator console. From the first output of the input register / digital code, a decoder 3 is output, the output of which is a signal, the incoming and the control inputs of the gating unit 7, which secures the electron-beam tube 4 and the 12-step voltage generator.

By the command “Freeze frame memorized by the electron beam tube 4 is transferred to the single recording and long continuous reading mode, the gating unit 7 prohibits the freezing frame from passing through the amplifier 6 to record the light signals of the recording beam, and the 12-step generator stops terminating and continuously adjusting the gain of the readout amplifier W, since the amplitude of the read signal during the mode. m "The freeze frame remains almost unchanged. The task of synchronizing the moment of issuing the command “Freeze-frame immediately after the next input of information in order to receive the maximum possible

the playback time of a static image is easily resolved in the input register /. To transfer the device to the regular mode from the operator's console or from the computer via the input register / on the detrl-r4 r l t lr i Q p / -1glt. - ,, - ,, ,, tgltt. t l tt

If you cancel the Freeze Frame mode, the device starts the color dynamic image again.

Thus, expanding the functionality of the device for displaying information on the screen of a color cathode ray tube, along with the color indication of dynamic information, can be produced by introducing a second decoder and, as a result, the Motion Frame, analysis, photo documentation and relatively long storage. captured at a certain point in time, which eliminates the need to use a video recorder to reproduce individual moments of display and reduces the use of computer memory and computer time during maintenance and repair work.

Claims (1)

1. USSR author's certificate No. 613392, cl. G 06 K 15/20, 04/06/76.