SU1525723A2 - Device for display of information on cathode-ray tube screen - Google Patents

Abstract

The invention relates to computing, is intended to display graphic and symbolic information on a CRT screen, and can be used as a computer peripheral device. The purpose of the invention is to expand the field of application of the device by allowing the display of vectors in the polar coordinate system, which is achieved by introducing the second frequency divider 19, the code converter 17, the second permanent memory unit 42, the switches 18, 38 and 39 codes and the corresponding functional relationships . The invention allows to display vectors in the polar coordinate system, but the coordinates of the origin of the vector are set in the Cartesian coordinate system, the beginning of the polar coordinate system in which the vector is constructed is placed at the starting point of the vector and the indicator beam 27 is set to the starting point of the vector, so as in the initial moment, the output signals of the multipliers 25 and 31 are equal to zero. When constructing a vector, the multipliers 25 and 31 multiply the sawtooth reference signal by the sine modules (multiplier Y coordinates) and cosine (multiplier X coordinates) the angle of the vector. Module codes for the angles from 0 to ϕ are stored in block 42, and the code of the angle of inclination of the vector is fed to the input of block 42 at the input 43. 1 sludge.

Description

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memory, switches 18, 38 and 39 codes and corresponding functional connections. The invention allows to display vectors in the polar coordinate system, but the coordinates of the origin of the vector are set in the Cartesian coordinate system, the beginning of the polar coordinate system in which the vector is constructed is placed at the starting point of the vector and the indicator beam 27 is set to the starting point of the vector, so as in the initial moment, the output signals of the multipliers 25 and 31 are equal to zero. When vectoring is bounded, the multipliers 25 and,. 31 multiply the sawtooth support signal by the sine modulus (multiplier of Y coordinate) and cosine (multiplier of X coordinate) by the slope of the vector. Module codes for angles from 0 to gG are stored in. block 42J and the code of the angle of inclination of the vector is fed to the input of the bloon 42 through the input 43. 1 Il, 1 tab.

The invention relates to computing, is intended to display graphic and symbolic information on a CRT screen, can be used as a peripheral computer device and is an improvement of the invention by the author. No. 1300542.

 The purpose of the invention is to expand the field of application of the device by displaying vectors in the polar coordinate system.

The drawing shows the functional diagram of the device.

The device contains, the first shift unit 1, whose inputs are the first 2 and second 3 information inputs of the device, comparison unit 4, first register 5, first switch 6, second register 7, decoder 8, first key 9, clock generator 10 (GTI ), the first frequency divider 11, the first counter 12, the OR element 13, the second 14 and the third 15 counters, the second shift 16 clock, the code converter 17, the fifth switch 18, the second frequency divider 19, whose information input is the fifth information input 20 of the device, the second switch 21, the third register 22, thr. this digital-to-analog converter (DAC) 23, the second key 24, the first multiplier 25, the first adder 26, the indicator 27, the fourth register 28, the fourth DAC 29, the third key 30, the second multiplier 31, the second adder 32, the first and second DAC 33 and 34 the second information input of the switch 18 is the seventh information input 35 of the device, the inputs of the D / A converters 33 and 34 are the third information

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26 and a quarter information input 37 of the device.

The device also contains the third 38 and fourth 39 switches, the control inputs of registers 5 and 7, the switches 18 and 21, and frequency dividers II and 19 are the control input 40 of the device, the first 41 and second 42 permanent memory blocks, the address input the latter is the sixth information input 43 of the device.

The device works as follows.

When displaying vectors in a rectangular Cartesian coordinate system, the codes of the coordinates of the beginning of the vector are received at inputs 36 and 37 to DAC 33 and 34 respectively. Output signals of DAC 33 and multiplier 25 and DAC 34 and multiplier 31 are summed by adders 26 and 32 respectively - the beam of indicator 27 is set to the starting point of the vector. The multipliers 25 and 31 multiply the codes of the projections of the vector on the coordinate axes by the reference signals that determine the nature of the beam movement along each of the coordinates. The codes of the projections of the vector to the inputs of the multipliers 25 and 31 are transmitted through switches 38 and 39, respectively, from the first and second the outputs of the shift block i. The polarity of the reference signals of multipliers 25 and 3 is set by keys 24 and 30, respectively, according to the signals received at their control inputs through switch 18 from input 35. The input signals of keys 24 and 30 are formed by a DAC 23 and 29, respectively. In order to ensure the synchronization of the construction of the projections to the inputs of the DAP 23 and 29 from registers 22 and 28, respectively,

are identical codes. Starpee. bits of the codes are formed by the counter 14 and are fed to the inputs of registers 22 and 28 from the output of the switch 21, the lower bits of the codes are formed by block 41 (single ones on the second and first outputs). Switches 18, 21, 38, and 39 ports: are fed into the required state by signals arriving at their control inputs on input 40,

High performance of the device is provided by adjusting the time of construction of the vector, depending on the magnitude of its larger projection. A larger projection sample is made by switch 6 in accordance with the signal arriving at its control input via register 5 from the output of comparison unit 4. The larger projection code is stored in register 7 and is used by decoder 8 as a governing build time. The shift of the codes of the projections arriving at the inputs 2 and 3 in the shift block 1 is turned off by gating the output of the decoder 8 by the time of forming the regulating code. The signals controlling the gating of the decoder 8 and the recording of information in registers 5 and 7 are received at input 40.

Increasing the steepness of the reference signals to unacceptable sizes is limited by a stepwise decrease in the amplitude of the reference signals by 2 (t is a natural number) times. The codes of the vector projections are shifted by m bits in the direction of the higher ones so that the amplitude of the output signals of the multipliers remain corresponding to the specified beam movement. The shift is performed by block I in accordance with the control signals generated by the decoder 8 on the basis of an analysis of the number of insignificant bits in the time-regulating code.

To regulate the time of construction, only n higher bits of the regulating code are used, which corresponds to dividing the regulating codes into groups, the size of which is halved with a halving of the regulating code. The vectors, the control codes of which belong to the same group, are built at the same time, which makes it possible to reduce the number of values of the steepness of the reference signal realized by the device, equal to

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the number of groups of control codes, which corresponds to the same amplitude of the reference signal (adjustable also depending on the value of the control code).

Block 41 contains as many arrays (pages) as the value of the slope is implemented by the device. On each page of block 41, linearly increasing codes of the reference signal of a certain slope are recorded. The sequential reading of the codes recorded on the page used for this regulation code value is provided by counter 12. It is reset to 0 at the end of the page (return to the top of the page). It is a frequency divider 11, coefficient. the division of which corresponds to the number of words on a given page and is determined by the higher bits of the code of the larger projections, shifted by block G. The output signal of the frequency divider 11 also initiates the transition to. the next state of counter 14, i.e. the latter counts the number of reads of the used page of block 41 (accumulation).

Thus, the device interpolates the linear (sawtooth) reference signal with a step function. The latter is the sum of two functions, one of which is formed by the counter 14 and therefore performs interpolation with a constant step in amplitude. The second of them is formed by block 41 and interpolates between the interpolation points of the first function. The number of points is in-. The termination of the second function is equal to the number of words on the used page of block 41, which provides the necessary

the reference slope and the vector construction time.

A decrease by a factor of 2 in the amplitude of the reference signal and in the vector construction time when shifting the projection codes in block 1 by m bits is done by decreasing the number of reads

used page block 41 in

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counter 14 bits using the key g 9, which prohibits the generation of GTI 10 clock pulses at a certain (decoder depending on the number of insignificant bits in the control code) counter state

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| A. The frequency clock 19 is displayed by the signal ijiocTynaromHM on its control input 1J1O input 40, and therefore does not affect the j-a6oTy of the GTI 10. If the value of m is large - (the number of bits counter 14, key 9 ijionHocTbro disables the last bit, using the output signal of the frequency divider 11 to inhibit the generation of pulses. The pages of the block 4I used for this, the transition to which is determined by the decipher: ator 8, are read once. The initial state of the counters 12-14 determines the code arriving at input 20 (when displaying vector information this code is zero), the signal controlling the writing of this code to the counters also arrives at input 20. Counter 15 does not use when constructing vectors. I When displaying symbolic information, the codes of the coordinates of the familiarity are transmitted to inputs 36 and 37 at TsA.P. 33 34, respectively. The output signals of the D / A converter 33 and the multiplier 25 and D / A converter 34 | and the multiplier 31 are summed by summers 26 and 32, respectively - the beam L1 of the indicator 27 is placed in the lower left corner of the familiarity. The inputs | multipliers 25 and 31 from inputs 2 and 3 1 through switch 38 and 39, respectively, receive a code that determines | the size of the displayed symbol (the shift of the IB unit 1 is pre-disconnected | by gating the output signal | decoder 8 for the whole time symbol signal arriving at the input of the decryptor 8 at the input 40).

The inputs of the reference signal multipliers 25 and 31 receive positive (in accordance with the information received when the symbol is displayed through the switch 18 from input 35 to the control inputs of keys 24 and 30) the output signals of the DAC 23 and 29, respectively, which ensure the movement of the beam along the contour display symbol The low bits of the input codes of the digital counters 2 and 29 enter them from the first and second outputs of block 41 through registers 22 and 28, respectively; the first bits from the output of switch 21 through registers 22 and 28, respectively. The switch 21 provides, when displaying symbols, a zero state of the eyelids formed during display.

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By means of a counter, the 14 most significant bits of the input codes of the D / A converters 23 and 29. The required state of the switches 18, 21, 38 and 39 is set by the signals supplied to their control inputs at input 40.

The initial state of the address counter of block 4I formed by the serially connected counters 12, 14 and 15 determines the code arriving at input 20.

The output word of block 41 contains two service bits. The first of these is used to prohibit the generation of GTI clock pulses 10 after reading from the display symbol description block 41: a value prohibiting pulse generation, the bit is present only in the last word of the description of each symbol. The second service bit controls the presence of the highlight of the character's contour point, described by the currently read word of block 41. Its value is determined when making up the description of the contour of a specific character. The second service bit is not related to the formation of deflection signals and therefore is not shown in the diagram.

The frequency dividers 11 and 19 do not affect the operation of the device, since they are turned off: by signals coming to their control inputs on input 40.

When displaying vectors in the polar coordinate system, the codes of the coordinates of the beginning of the vector at inputs 36 and 37 arrive at the DAC 33 and 34, respectively (the coordinates of the beginning of the vector are specified not in the polar, but in the Cartesian coordinate system, the beginning of the polar coordinate system in which the construction of the vector is placed at the starting point of the vector). The output signals of the DAC 33 and multiplier 25 and DAC 34 and multiplier 31 are summed by adders 26 and 32, respectively - the indicator beam is set at the starting point of the vector, since at the initial moment the output signals of the multipliers are zero. During the construction of the vector, the multipliers multiply the sawtooth reference signal by the sine modulus (multiplier Y coordinate) and cosine (multiplier X coordinate) the angle of the vector. Sine module codes

and cosines are fed to multipliers 25 and 31 via KOMNfyTaropbi 38 and 39, respectively, from block 42, containing the module codes for the angles from O to TG. The code of the angle of inclination of the vector software steps to the input of the block 42 to the input 4

The sawtooth reference signals for multipliers 25 and 31 are formed by DACs 23 and 29, respectively. The required polarity of the reference signals of the multipliers 25 and 31 is given by terminals 24 and 30, respectively. The sequential control code is generated by the converter 17 of the codes of the quadrant number, in which the Gnomer quadrant vector is constructed is contained in the two higher bits of the slope of the vector entering the input of the converter 1 7 codes on input 43).

The operation of the converter of 17 codes is illustrated by the table. The output code of the converter 17 is fed to the control inputs of the keys 24 and 30. Through the switch 18.

When constructing vectors in the polar coordinate system, the DAC inputs 23 and 29 use the same codes via registers 22 and 28, respectively. The minor code bits are formed by block 41. This uses the same array (page) of the memory block as in the construction of the maximum length vectors in the rectangular Cartesian coordinate system, addressing this array is provided by the necessary gating of the decoder 8 output input at input 40. Sequential reading of the codes contained on the block page is provided by counter 12. High-order bits of the input codes of the DAC 23. and 29 are fed to them through the switch. 21 from the output of the counter 14. The frequency divider 11 is turned off by the signal fed to its control input at input 40, therefore the change in the state of the counter 14 is caused only by the overflow of the counter 12, i.e. counters 12 and 14 when constructing vectors in the polar coordinate system form a single binary counter, as in the display of symbols. The initial, connection of counters 12 and 14 is zero.

Proportionally to the length of the vector, the length of the sawtooth reference signal is set by frequency divider 19, the division ratio of which is equal to the vector length code supplied to its information input at input 20. The output signal of frequency divider 19 prohibits generating GTI clock pulses 10.

The switch-off key 9 does not affect the operation of the GTI 10, since its output signal is generated after the time required to build the maximum length vector (in accordance with the decoder output gating, i.e. not before generating the output signal of the frequency divider 19.

The required state of the switches 18, 21, 38, and 39 is set by signals arriving at their control inputs at input 40.

Claims (1)

Invention Formula A device for displaying information on the screen of a cathode ray tube according to avt.S. No. 1300542, characterized in that, in order to expand the field of application of the device by displaying vectors in the polar coordinate system, it contains a second block of permanent memory, a code converter, the input of which is the sixth information input of the device connected to the address input of the second block a fixed memory, the second frequency divider, the information input of which is connected to the fifth information input of the device, the control and counting inputs - with the control and counting inputs of the first frequency divider, respectively O and output - with the third control input of the clock generator, the third, fourth and five switches, the first and second outputs of the first shift unit are connected to the first 1 and information inputs of the third and fourth switches, respectively, the second information inputs of which are connected to the first and second outputs the second block of permanent memory, respectively, the outputs of the third and fourth switches are connected to the information inputs of the first and second multipliers, the output of the fifth switch is connected to the control the inputs of the second and third keys, the first information input The fifth switch is connected to the output of the code generator, the second information input of which is the seventh information input of the switch. Acknowledgment: at state 1 on the control input of the key, the inverted: DAC output signal is connected to the multiplier input; in the state O, it is not inverted. The controls that control the inputs of the third, fourth, and fifth switches are connected to the control input of the device.