SU546915A1 - Device for displaying color graphic information - Google Patents

Description

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The invention relates to automation and computing and can be used in the construction of color alphanumeric indicators on cathode ray tubes (CRT).

It is known a device for color display of information, which contains an NT data recording unit and a CRT memory block 1. For displaying in one of the primary colors (P-red, G-green, B-blue) information in this device is recorded on a dielectric. Targets at three appropriate levels of potential terrain. For this purpose, pulses are formed in the recording unit, the amplitude of which ire takes one of three possible values, depending on the code received at the input of the recording unit. By scanning a target with a CRT electron beam at the input of the readout unit, pulses of three levels are obtained, which are separated by an amplitude discriminator. In the readout unit, the signals are distributed over the trem outputs P, G, and B. From the output of the block, signals can be sent to a color indicator. The method of coding the color of the data recorded on the target of a CRT using amplitude modulation is not very reliable, due to the effect on the results of coding and decoding such factors

as stailiness of power sources, modes of a tube, and stages of reads and readings, as well as uneven background of the target of tubes, etc. The closest to the invention is a device containing a video switch, an inverter and a series-connected recording unit that stores a cathode ray tube, block readout and limiting amplifier 2. The coding of the information in this device is carried out by several pulses of the target memory of a CRT, and for dividing the color codes of individual image elements using There is a principle that may cause distortion of color information along the entire reading line on the target.

The proposed device is different in that it contains the first key element, a block of frame blank and, consequently, a second key element, a counter and a crosslink, with the frame being formed with the first key element associated with the reader block and video switch, connected to the power generator, a counter and an inverter connected to the second key element connected to it); reinforcement grader. This makes it possible to increase the accuracy of the information I receive about my color and quality.

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The drawing shows a block diagram of the proposed device.

It contains a recording unit 1, a CRT memory 2, a reading unit 3, a first key element 4, a video switch 5, a decoder 6, a counter 7, a limiting amplifier 8, a second key element 9, an inverter 10 and a frame I.

Information from, for example, electronic computational masking to the input of recording unit 1 is converted into a series of consecutive pulses that are recorded on the potential relief of a target CRT 2.

The color code of the data is recorded as a specific, predetermined number of pulses. Each number of pulses must correspond to a specific color. In order to increase the reliability of determining the color of a pn decoding code, it is possible to assign not one number of pulses to each color, but within certain limits. For example, you can assign one to two pulses to red, three to green and four, blue to five, etc. The absence of impulses of the color sign should correspond to a black and white image. The pulses of the color mark are recorded in the dedicated target areas of the memory CRT. The locations of the zones are determined in accordance with a predefined mapping table — a frame blank. Each form is assigned a binary number. Zones must be placed directly in front of the data whose color they determine, and the color attribute pulses are recorded on all read lines on which the data is located. In the case when it is necessary to restore the color of the line after the data group, after these data corresponding codes are recorded in the location of the color indicator.

Iri scanning the CRT memory electron beam by reading the pulses located on the raster lines and amplifying the signals in the readout unit 3. From the output of this unit, through the first key element 4, the video signal enters the input of the video switch 5, in which the color separation of the signals to red P occurs, green O and blue B in accordance with commands received from decipher 6. In the absence of a command, the video switch outputs the P, G and B ratios that correspond to black a single image. Signals from counter 7 are fed to the input of de-baffle 6. Pulses to the input of the counter come from the output of reading unit 3 through amplifier-limiter 8 through the second key element 9.

In order for the input of the counter 7 to receive pulses that are in the zones of the characteristic of the color of the data, the key element 9 must

open only for the time of passage of the electron beam of the memory ZLT at the corresponding places of the target tube. The control of the key element through the inverter 10 is carried out by the frame-forming unit 11. The synchronizing pulses from the device’s clock signal generator are supplied to the input of this block in order to ensure accurate binding of the blanking

pulses produced by the block to the read raster. The write raster and read raster in the device must either match or be aligned according to a predetermined relative position. The number, duration and location on the read line of blanking pulses is determined by the blank code entering the input of block 11, i.e., the type of data display table that should be presented to the operator at the moment. The blank code can come either from the command extraction block, for example from a digital computer, or from an operator console when requesting certain information.

The blanking pulses with the leading edge reset the counter 7 to zero and, with a small delay, open the second key element 9 for a time of the duration of the blanking pulse. Counter 7 outputs the corresponding signal to the decoder 6. In order for the color indication pulses not to appear on the screen of the video monitor, the first key element 4 blocks the input to the switch for the duration of these pulses using the same blanking pulses.

The proposed device allows to increase the reliability of data presentation, since the color feature in it does not depend on

stability of power sources, modes of operation of the tube and other nodes of the device. In addition, the scheme of the entire device is simplified, since the need to compensate for the background of the target of the tube and quantize the signal levels is eliminated, which increases its reliability in operation.

Claims (2)

1. Author's certificate of the USSR Law 414447, M. Kl.2 G 06F 3/14, 25.10.74. 2. "Questions of aviation radio engineering. Issue 5, Kiev Institute of Civil Aviation, 1970, p. 58, fig. four. SiN) p01 / 1 majors IMP / 11Sh