SU591886A1 - Device for presentation of symbols on crt screen - Google Patents

Description

(54) DEVICE FOR THE FORMATION OF SYMBOLS ON THE SCREEN OF ELECTRON-BEAM PIPE

the second counter 10, the former 11 line scanner and the imager 12 frame scan, the elements And 13, the second elements OR 14.

The device works as follows.

Pulse generator 1 generates clock signals that determine the duration of an element of a string of synthesized characters. This signal controls the operation of the ring counter 2, which determines the number of elements in the line of synthesized characters (the width of the sign) and the necessary interval between the characters in the line. The output signals of the first ring counter 2 are fed to the inputs of the imaging unit 3 horizontal pulses, which forms sets of sequences of pulses for progressive synthesis of characters.

For example, to write characters B, E, B in a raster of 5X7 elements (see Fig. 2), it is necessary to form five different sequences of pulses (see diagrams I-V in Fig. 2, b). The presence of a pulse corresponds to the highlight of the element of the raster line of the symbol.

The signal from one of the outputs of the first ring counter 2 acts on the input of the first counter 5 at the point in time corresponding to the beginning of the gap between the characters in the line. The output of the first ring counter specifies the line scan period of the line scanner 11 and controls the second ring counter 9. The second ring counter determines the number of elements along the height of the symbol LUM and the interval between the lines of characters in the information frame.

The output of the second ring counter 9 controls the second counter 10. The output of the second counter determines the frame scan period of the frame scanner 12. In addition, the output signals of the second ring counter 9 control one of the inputs of the second decoder 6. The other inputs of the second decoder receive the output of the first decider 4. In the second decryptor 6, groups of characters and strings are combined.

For example, for the characters B, B, the union is made on the fourth and seventh rows of the raster (diagram I of fig. 2) and on the fifth, sixth lines (diagram II of fig. 2). For the symbols B, E, the obt. Connection is made on the first line (diagram III of FIG. 2) and on the second, third lines (diagram IV figure 2).

The output signals of the second decoder 6, corresponding to the same pulse sequences for the progressive synthesis of symbols, are combined on the OR elements 14. The output signals of these OR elements are combined with the output signals of the horizontal pulse generator (the necessary pulse sequences) on the corresponding AND elements 13. The output signals of the elements And 13 act on the inputs of the first element OR, which controls the amplifier, the light 8.

The use of the elements AND, OR and the formatizer of string pulses for the progressive synthesis of symbols favorably distinguishes the proposed device from the known one, since it makes it possible to reduce hardware costs and increase the speed of the symbol former by eliminating the shift register.

Claims (1)

1. USSR author's certificate number 356639 cl. G 06 F 3/14, 1972. 2-. Patent of Germany No. 2029247, cl. G 06 K 15/20, 1974. & -LJ / 2 J