SU879634A1 - Device for symbol rotation - Google Patents

Description

(54) DEVICE FOR TURNING CHARACTERS

one

The invention relates to the field of computing technology and can be used in devices for displaying information.

A device for displaying information is known, which contains a memory block, a decoder, a trigger, adders, a counter, a register and a backlight unit 1.

The closest in technical essence to the invention is a device for displaying information, comprising a serially connected symbol code decoder, a memory unit, a control unit and a quadrantu selector unit, a pulse generator connected to a memory unit, another output of which is connected to the backlight unit, an angle decoder rotation connected to another input of the quadrant quadrant and one sine-cosine converter input connected to the beam sweep amplifiers 2.

The disadvantage of these devices is their complexity.

The aim of the invention is to simplify the device.

 The goal is achieved by the fact that the proposed device contains. The first and second registers

shear, first, second and third adders. The input of the first adder is connected to one output of the first shift register, the input of the second adder is connected to another output of the first shift register, and the input of the third adder is connected to the output of the second shift register. The inputs of the shift registers are connected to the outputs of the quadrant selector block, the outputs of the adders are connected to the other inputs of the sine-sinus transducer.

The drawing shows the structural scheme 15 of the proposed device.

The device contains a decoder 1 character code, memory block 2, pulse generator 3, decoder 4 rotation angle, control unit 5, 20 backlight unit 6, shift registers 7.8, quadrant selection unit 9, adders 10-12, sine-cosine converter 13, the amplifiers 14, 15 sweep of the beam, bus and control signals 25 to 16-21.

The device works as follows.

In accordance with the character code supplied to the decoder 1, the last 30 SRI generates a signal used

to select the selected character in block 2 of the firmware.

When a start-up pulse arrives, the generator 3 generates signals that sequentially read microcommands from block 2 of the memory of which the firmware of the selected symbol consists of. Each microinstruction is an information word containing information about the movement along the coordinate axes + X, -X, + UI -Y, illumination, and the end of the symbol.

Control unit 5 depending on. microinstructions arriving at its input from memory block 2 generate rectangular pulses corresponding to the microprogram of the symbol + X -X, + Y, -U, which through the block

9 enter the inputs of shift registers 7 (X) and 8 (Y).

The shift registers 7 (X) and 8 (Y) are produced at the outputs of a sequence of positional digital codes of signals moving along the contour of a symbol, respectively, along the coordinate axes and Y, and in the filling mode, a sequential increase in the value of the positional digital code occurs, and in zeroing mode a sequential reduction. The signals from the single shoulder trigger bits of the registers 7 (Y) and 8 (Y) are fed to the adders, respectively.

10 (X) and 12 (), and from the zero arms of the trigger bits of the register 7 (X) to the adder 11 (X). At the same time, each trigger bit of registers 7 and 8, co-number 1, is equal to a unit weight current, equivalent to one elementary movement along the contour of the symbol. Adders 10, 11, 12 summarize the weight currents and produce at the outputs analog signals X, X and Y ,.

The analog signals of the adders 10 through 12 through a converter .13 are fed to beam sweep amplifiers 14 (X) and 15 (U), which form stepwise deflection voltages on the tires — for example, a CRT of a video block, along the contour of the displayed symbol, respectively. os m x and y. At the same time, the backlight unit b controls the backlight, for example, highlights the CRT beam, depending on the signal coming from the memory unit.

With the arrival of a microblock from the memory block to the input of the control unit 5, signifying the end of a character, the device finishes the formation of a character.

The decoder 4 of the rotation angle contains the decoder of the two most significant bits and the decoder of the lower bits of the code of the angle of rotation. With the arrival of the rotation angle code I, to the input of the decoder 4. the two high-order decoder produces a quadrant characteristic that arrives at the input of block 9 of choice

a quadrant that realizes the rotation of a symbol by an angle d, a multiple of 90 °, by switching control signals + X, -X, + Y, -Y, coming from control unit 5, depending on the values of the two high-order bits of the angle-of-turn code - 00 , 01, 10, or 11, corresponding to 1, 1J, III, and 1U quadrants, the outputs of the block selection | Quadrant 9 are the following 1FUNCTIONS:

Bus 16 (+ X) L (00) v S-Y) L (01) h (-X) (10) U (+ y) A (11)

Tire 17 (-X) L (00) v (+ y) l (01) V (+ X) L (10) Y (-y) L (11)

Bus 18 (+ Y) (00) V (+ X) L (01) V (-yU (10) J (-X) A (H)

Bus 19 (-Y) (OO) V (-X) A (01) V (+ Y) L (10) Y (+ X) L (11).

When the symbol is rotated through the tf angle, non-repeated 90, the low-order decoder of the rotation angle code generates the sign of the rotation angle | i (/ 5 ff -ck) / within the range from 0 to 90 °, which is fed to the converter 13. the signals from the adders 10-12 to the coordinate amplifiers 14 and 15, through the converter, the latter performs the division of the coordinate components of the symbol in proportion to the sine and cosine of the angle of rotation. At the same time, the following functions are implemented on the output tires 20 and 21:

Bus 20 X.-tOSU- -y-Stn |,

Tire 21 US05B + X-51P | 5

Amplifiers 14 (X) and (U) directly add up the signals arriving on buses 20 and 21.

In general, the Sinus-cosine converter is implemented using amplifiers with a negative inverse. links, the gain of which is changed in proportion to the sine and cosine of the angle of rotation | b.

Claims (2)

1. USSR author's certificate, 453719, cl. G 06 K 15/20, 1977. 2. Authors certificate of the USSR 468235, cl. G 06 K 15/20., 1977 (prototype). 1L // // Tj h at /