SU807263A1 - Device for displaying symbols on crt screen - Google Patents

Description

The image refers to automation and computing, and it can be used to extract information from an electronic computer to a CRT screen as a vice for a variety of visual characters. The CHMBonoBL display set devices that are extracted from a small-format television raster are known on the CRT screen, consisting of a control unit, a buffer memory unit interconnected with it, and a CRT beam control unit jll. The closest in technical essence to the present invention is a device comprising a control unit, an interlocking memory unit, a first and a second pulse counter, and a first and second code-voltage converter, whose terminals are connected to the outputs of the corresponding pulse counters, the first one The first pulse counter is poaco intact to the control unit 21. The main disadvantage of these devices lies in the relatively low speed, since the display time of each is equal to, the backlight pulse duration one element of the decomposition of a small-format television raster; The number of decomposition elements in such a raster. The useful time spent on extracting the elements of the rrlp decomposition of the small format of the evizational raster that is included in the generator of the ith symbol is equal to cr V pi pi. Since "ifp np or" trpr, then u-tj. and, as a result, the device speed, which determines the volume of the displayed alphabet, is less than lx, much less than the possible one.

The purpose of the invention is to increase the speed of a device and, as a result, the size of the displayed alphabet.

This goal is achieved by introducing a multi-bit register, first and second key blocks, a waiting generator block, a logic block, an OR block and three OR elements, the first and second control inputs of the register connected to the first and second outputs of the control block. , the third information input is with the output of the memory unit, and the register outputs are connected to the inputs of the first and second key blocks, respectively, one input of each of these blocks is connected to the second input of the control unit, the outputs of the first key block are Ina with the block of elements OR and with the first element OR, the output of which is connected to the first input of the third element OR, the outputs of the second key block are connected to the inputs of the block of waiting generators and with the second element OR, the output of which is connected to the second input of the third element OR and the output of this element connected to the second input of the first pulse counter and to the deflecting system of a CRT, the outputs of the second pulse counter are connected to the inputs of the logic unit, the output

which is connected to the second input of the control unit.

The drawing shows the block-heading device.

The device contains a control unit 1, an N bit register 2, a first 3 and a second 4 pulse counters, a memory block 5, a first 6 and a second 7 transducers code-apr, a logic block 8, a first 9 and a second 1O key blocks, a block 11 waiting generators, block 12 elements OR, first 13 and second 14 elements OR with N inputs, element OR 15 with two inputs.

The device works as follows.

Under the influence of a signal generated in control block 1 and fed through bus o) "N bit register 2 is reset to zero. Then, under the influence of the signal generated in block 1 to the incoming bus 1 to register 2, the code content of the first line of the small-format television raster is sent from memory block 5. At the same time, this koa has the form (bm. Table) for four, separated from the decomposition elements of a small-format television raster with a 7x5 tprpr.

As follows from this table, N is the number of decomposition elements in one row of the raster, i.e. N Ex.

Register 2 is the combination of N trigger cells (T1, T2, ..., T H). The direct outputs of the trigger cells of the register 2 are closed to the first inputs of the AND elements of the first key block 9, and the inverse ones to the first inputs of the H elements AND the second block of 10 keys. therefore

control signal that is on the bus

S from control unit 1 enters the input of blocks 9 and 10 keys, passes either through the first element AND of block 9, when the first digit of register 2 from memory block 5 is sent to zero, or through the first element of block 10, when in ne ( The first digit of register 2 is a one.

The signal from the output element And block 10 starts the corresponding standby generator in block 11 of the waiting generators. Under the influence of the triggering signal, the waiting generator generates a rectangular pulse and 2 of duration A ± 2 which through the OR 13S N input leads to the control electrode of a CRT (not shown on the line) than the first decomposition element in the first row of a small-format television raster is reached . The signal from the output of the element OR 13 passes through the element OR 15 with two outputs and enters the second input of the first counter of 3 pulses, changing its contents to one. Prior to this, this counter was reset to zero by a signal received from control unit 1 via the bus t. The contents of the counter 3 in the first. Converter 6 transforms the voltage code into a voltage). which leads to a horizontal CRT system (not shown in the drawing). By this, the CRT beam is shifted to the second decomposition element in the first row of a small-format television raster. If the signal from control block 1 passes through the first AND element of the first key block 9, then it goes through the first OR element of the block of 12 OR elements to the corresponding inputs ..., ". second elements And blocks 9 and 1 of keys. Therefore, if in register 2 zeros are sent in all bits, the signal from control unit 1 passes through the AND elements of the first key block 9 and the OR elements of the 12 block, the waiting generator generators of block 11. The output of each AND key of the first key block 9 is closed to the corresponding input element OR 14, from the output of which the signal through the element OR 15 enters the counting input of counter 3, changing, as in the previous case, its contents. The rate of change of the contents of counter 3 in this case is determined by the delay time of the signal in each element of AND 9 of the block 9 and in each element of OR of block 12. This time is 2-3 orders of magnitude shorter than the required duration of the backlight pulse. If during all bits of register 2 of memory block 5 units of impulse from control unit are passed through elements of block 10 and sequentially start the waiting generators of block 11. In this case, the next waiting generator is started by the falling edge of the previous one which passes through the corresponding OR element of block 12 and the AND element of block 10. If units of memory 5 are sent to one bits of register 2, and zero are sent to others, then the corresponding bits of registers to which units are sent are the pending block 11 generators are energized and Corresponding decomposition elements in a low-format television raster are highlighted. The combination of these elements constitutes the symbol generator along the first line of such a raster. The signal from the output of the last element OR block 12 is fed to one of the inputs of the second counter 4 pulses, reducing its content by one. Prior to this, this counter was set to its original state by a pulse received from the control unit via bus C. Content of counter 4 in the second converter 7 code-voltage is converted to voltage Uy (-fc), under which the beam is shifted CRT between adjacent lines. Ma-, a large-format television raster. From the last OR element, block 12 also goes to the control unit, informing it of that. what . ", Chg". "" Lapp the process of forming the first line of a small v g "", "format of a television raster is completed. The described process is repeated (for the second, third, and so on lines) until the contents of counter 4 become zero (in the case when its initial value is N) the state corresponds. In this case, the output of logic circuit 8 The signal is taken, which is fed to the control unit, informing it that the process of forming signals of the last line of the small-format television raster has begun. When the signal from the output of the last element OR of block 12 to control block 1 is knocked, the process of forming voltages U (t), 0 (t) and illumination pulses Uj for a given symbol extracted from the decomposition elements of a small-format television raster stops and the process begins forming voltages and light pulses for the next symbol, etc. At the same time, the next symbol is shifted relative to the first by forming the corresponding signals by a circuit not shown in the drawing, since it is not included in the design of the invention.

The win in the speed of the device being tracked is determined by the expression

dl

m

For figure four, this gain is

2.5 at

-7x5

PPrpr (f g14.6 at

 14x10 "rPr

21x15

7.0 with tripflp

As follows from this expression, the speed of the device and, as a result, the volume of the displayed alphabet increases at least in the other conditions being equal.

Claims (2)

1.Govore V.S. Displaying Machine Solutions on CRT Screens, M, Sovetskoye Radio, 1975, p. 91, 2.Kostiuk V.I. and Khodakov V.E. Display systems info) and engineering psychologists. Kiev, Rad Nska School, 1977, p. 116 (prototype).