SU487403A1 - Device for displaying information on the screen of a cathode ray tube - Google Patents

Description

The functions f, „. 7 /“ and the signals of fushkdia 1 to / - / for the purpose of receiving signals fmnl l-output of multiplication unit 4 is connected to the third input of the lighting unit 5. The output of the partial input unit 5 is connected with the input of ELT7. The fourth input of block 5 is connected to the output of the decoder of the character 6.

The decoder of the sign 6 is designed to decrypt the code of the displayed sign. It enters input 9 and generates an address signal. This signal is processed into the cell of the memory block 5, where information about the displayed character (reference box) is stored, the code of which is received at input 9.

CRT7 is designed to reproduce characters (graphs).

The proposed device works as follows. At the initial moment, the time and time period of the circuit are set to the zero state, at which the function signals for the entire set of characters and graphs, data about which are located in memory block 5, are equal to zero. At the same time on the CRT screen there are no images of displayed signs or graphs.

When a trigger signal arrives at the input 8 of the generator 1 of the character code signals to the decoder 6, the generator J begins to generate a sequence of clock pulses following at intervals A. sign or graphics.

Generators 2 and 5 produce signals of orthogonal functions (fmit / and -fp ///, arriving at the first and third inputs of memory block 5, as well as at the corresponding inputs

block multiplier 4. Block wisely; and the signals of the products are generated, arriving at the second input of the memory unit 5. The impact of the signals arriving at the first

the three inputs of the memory unit form the function signals for the entire set of characters and graphs represented as conductivities in its cells of the m. type. However, only the signals of the selected character (graphic) to be displayed, the code of which entered the input of the decoder 6, are passed to the output of the memory block 5 and the input of the CRT7. The rest of the signals are not received at the input of the CRT.

At the end of a single time interval, the generator 2 generates a signal for the end of the sign, according to which the generator 7 stops working, and the circuit is reset to the next trigger signal and the next character code

(graphics) to be mapped to inputs 5 and 9.

Subject matter

A device for displaying information on a cathode ray tube screen, comprising a clock pulse generator associated with a piecewise constant function signal generator, a electron beam tube associated with a memory unit connected with a piecewise constant wave signal generator and a character decoder characterized in that, in order to improve the quality of the display, it comprises a series-connected signal generator of continuous functions and a multiplication unit, the signal generator of continuous functions being connected to a clock generator and a memory unit connected to the multiplication unit.