SU651380A1 - Arrangement for displaying information on crt screen - Google Patents

Description

one

The invention relates to computing.

There are known devices for displaying a point in any place of the raster of the vice-monitoring block, containing blocks for comparing codes to which signals from buffer and static registers are assigned. The signal from the comparison blocks is fed to the coincidence block ij.

The disadvantage of these devices is the presence of cumbersome multi-bit parallel blocks of comparison codes. The use of static registers; for storing the processed information reduces the reliability of the device.

Closest to the proposed device. containing a quantization step setting block, connected to a pulse generator, the first output of which is connected to the cathode of the cathode-ray tube, the second to the line generator, the third to the frame sweep generator, the outputs of which are connected to the corresponding deflecting coils of the cathode ray tube; the tube modulator is connected to the video-amplified output. tel, the input of which is connected to the output of the mixer; the input of the mixer is connected to the first element of match 2.

In order to obtain a fixed-point image on the CRT screen, in the case of parallel comparison of codes applied in the prototype, a constant parallel arrival of point coordinate codes to the inputs of comparison units during forward beam travel and change of codes during reverse beam travel is necessary.

The purpose of the invention is to increase the reliability of the device.

This goal is achieved by inserting a selection unit into the device, the input of which is connected to the output of the impulse generator, a trigger connected in series, a second coincidence element, the second input of which is connected to the selection unit, the first delay element, the second delay element whose output is connected to the trigger input , and successively fucking each of the KooprwHat keys, the input of which is connected to the output of the primary unit. delays, the counter, the second input of which is connected to the output of the second element - the match, h is the fixation block, the output of which is connected to the first element of the match. The drawing shows a structural electrical circuit of the device. The device contains an assignment block of 1-shanting step 1, a pulse generator 2, a lower-case 3 generators and a frame vzverkverki 4, a selection unit 5, a trigger 6, elements of match 7, 6, delay elements 9, 10, keys 11, 12 for coordinates X and Y , counters 13, 14 of the locks are fixed 15, 16, mixer 17, the form of a reader 18, a deflecting system 39, a CRT 20. The device operates as follows. Signature signal and bapani quantization of quantization 1, the quantization step of pacta, is received on the count of input 13 of the coordinate X and on the input of the geerator and impedance 2. The full recalculation period of the counter 13 is equal to the horizontal beam of the ray, I have j a j a j a j a j a j a j a j a j a ja ja ja i j a ja ja i j a ja i j a j a j a j a ja i j a j a j a j a j i j a jr. of the counter is C1 pt “, the determined position of the beam is 6 lines pictorial, C (4th counter input 14, pb of the co-ordinate) PozzyTs are lower-order iiynbfXA from the second output of the reHepiarBipa of pulses 2. Many counts of counts are 14kPa. 1g of ator quench yuihroymp lsi zapirayShyy "bktrrnny beam ELT20 during ofe jjatHorp stroke pb boom and the frame, at 1SH {b) Tc on byok sepeyugii 5. where both are baked for selection of lowercase and personnel rabsffliHx-impulses, and if the two signals from the trailing edges of the drip and lower-case pulses coincide, the control is formed: the lightest sygnay. ,.:., .., This signal arrives at the first. feXoa of the coincidence element 8, to the second input of its permitting signal from the trigger тол, a thickening of the input signal appears, YmpuyS 6 at the same time, 8 sets the counters to the initial (zero) state and through the delay | KU ;. An air delay element 9 writes the code of the point's coordinates through keys 11, 12 into the corresponding counters, as well as through a delay. The 8O4 formed by the delay element 10 sets the trigger 6 to its original state. For the correct functioning of the deducting counters, the parallel setting to zero and the recording of the information must be completed before the next pulse arrives at the counting input of the counter | pulses. Suppose, at the input of keys 11, 12, there is zero information about the coordinates of a point in a line and the coordinates of a line. . In this case, when the input signal is applied, the z | is set to zero and the signal at the output of the fixing unit 15 on the X coordinate n0 appears at the beginning of each television CTipOKH, and on the output of the fixing block 16 on the Y coordinate - in the first line of each frame. The backlight pulse signal is generated when there are simultaneous signals at the outputs of fixing blocks 1ё, 16. When writing the number K to counter i3, the signal at the output of fixation block is 15 in; this occurs after the arrival of H pulses at the counting input of counter 13 in each television line. Similarly, the recording of the Number M in the counter 14 is a signal. Neither the output of the fixation block 16 appears in M lines. When the impulses coincide at the input of the coincidence element 7, a signal arises at the input, which is fed to the mixer 17, to the second input of which a television image signal is received. From the mixer, the signal is fed to video amplifier 18 and further to CRT 2 O, ensuring that points are spotted at a selected location on the selected line of the television raster. Line and frame scan generators 3, 4 through the deflecting system. 19 expand the beam on the screen of the CRT 20. Pulse generator 2 synchronizes the operation of the sweep generators and extinguishes the beam for the time of reverse gsods in rows and frames. ; „„: 1, P as a result of the replacement of the block of comparison by counters 13. 14 the number of elements has decreased, therefore, this scheme works autonomously, and as regards its reliability. Storing the code in the counters for the processing time of the information and synchronizing the reception of the codes. The trigger made it possible to speed up the exchange of information with an external device and thus expand the functionality of the device.

Claims (2)

1. UK application N91278883, cl1 H 4T / Q 06 K 15/20, 1972. 2. USSR author's certificate, № 441578, cl. Q 06 K 15 / 2O, 1972. V8oU