SU377765A1 - DEVICE FOR FORMING SIGNS • Sesoyuznd ADT1ITY04ESHM [: ^ 1 {A1 - Google Patents

Description

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The proposed device relates to automation and computing.

A device for forming characters is known, comprising a cathode-ray tube, a clock generator connected to a counter, which is connected to a tube modulator through a character-coding unit.

However, such devices do not allow varying the rate of rise of the sweep voltage at individual sites, and, in addition, when the frequency of the clock generator changes in known devices, the sizes of the displayed characters change.

The proposed device is different in that, in order to change the scanning speed in certain areas and to obtain the independence of the size of the characters from the frequency of the clock generator, it additionally introduces the horizontal and vertical scanning decoders, with the outputs of the low-order bits of the counter being connected via horizontal line deflectors plates of the cathode ray tube, and the outputs of the higher bits of the counter through the frame scan decoder are connected to the vertical deflection plates of the tube .

FIG. 1 shows a block diagram of a character maker; in fig. 2 shows three bits of the counter with the decoder scanners connected to them.

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The device consists of a clock generator /, the clock pulses from which are fed to the input of a binary counter 2, a decoder 3 horizontal sweep, a decipher 4 personnel

scan, block 5 encoding signs, electron beam tube 6.

The outputs of each bit of the counter are connected to a character encoding unit 5, which forms the time code of the character, synchronously with the clock pulses fed to the input of the counter. A 3 line scan decoder is connected to the low-bit outputs of a binary counter, and a 4-frame scan decoder is connected to the high-end outputs

counter bits.

The values of the resistors /, ..., K are chosen such that a step voltage is obtained at the output of the decoder, and the amplitude of each stage is proportional to the binary code of the number set on the counter. The number of steps that can be obtained at the output of the decoder is 2, where n is the number of binary bits of the counter at the input of the decoder. With the arrival of the clock

the pulse to the counter input changes the output voltage of the decoder.

The signal from the output of the sweep decoder is fed to the deflection plates of the cathode ray tube, while the beam performs

hopping on the screen. The synchronization with the movement of the beam by the character encoding unit produces the time code of the displayed character. By selecting resistors Ri, ... Ra entering the decoder (see Fig. 2), almost any abrupt movement of the beam can be obtained with a number of steps of not more than 2. Another advantage of this device is the independence of the size of the sign displayed from the clock generator frequency, since the beam travels on the screen synchronously with the generation of the sign code and is determined by a common counter. The subject of the invention is a device for forming characters, comprising a cathode-ray tube, a clock generator connected to a counter, which is connected to a modulator of the cathode ray tube via a character-coding unit, characterized in that, in order to change the scanning speed in individual sections and obtain independence of the dimensions of the signs from the frequency clock generator, line and frame scanners are entered into it, and the low-order outputs of the counter through the line scan decoder are connected to th izontalnym deflecting plates of a cathode ray tube, and outputs MSB counter decoder via frame scanning are connected to the vertical deflecting plates.

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