SU585509A2 - Device for displaying information on crt screen - Google Patents

Description

The invention relates to computing and can be used as an external computer device for outputting a digital letter information on the screen of a cathode ray tube.

A device is known comprising a clock generator, a synchronization unit, a sawtooth generator, a ring counter, a controlled oscillator, respectively interconnected.

The purpose of the invention. is an extension of the field of application of the device due to the formation on the screen of a cathode ray tube of symbols of various sizes.

To do this, a control pulse driver is introduced into a known device, the first output of which is connected to one of the inputs: a ring counter, the second output is connected to the input of a character size decoder.

The drawing shows a block diagram of the device.

It contains a clock pulse generator 1, black synchronization 2, a sawtooth voltage generator 3, a ring meter 4, an image array forming unit 5, a controlled generator p, a control signal generator 7, a character size decoder 8, tires 9 and 10.

The image array generation unit 5 includes a symbol generator, spreading signal amplifiers and a cathode ray tube with a deflection system.

The device works as follows. In the case, when the character code does not arrive at the input of the driver 7 of the controllable signals, the generator 1 outputs a sequence of clock pulses to the outputs of the sawtooth generator 3, the synchronization unit 2 and the counter 4. The generator 6 with a discretely controlled ramp saw voltage is triggered by the output signal synchronization block, the period of which is equal to the sweep time of the line.

Claims (1)

The device offers point-shaped formation of dictoles, which, with the absence of a VII special character size code consisting of 5 X 7 dots. Therefore, in this case, the first five pulses of the ring counter 4 go to start the generator 3 of the saw-tooth voltage generating vertical sweep signals. Horizontally, the scanning of the microraster is performed by the generator 6, controlled by the input pulses corresponding to the time interval between the fifth and sixth pulses of the ring counter. These pulses lead to an increase in the steepness of the sweep voltage and, accordingly, the speed of the beam moving across the CRT screen. As a result of the increase in the speed of the Lane, the ELGG beam takes more than one pixel at a time, more than the effect of adjusting the distance between the symbols is achieved. To control the distance between the groups of symbols in block 2 of them, a signal is generated that arrives at the second & SPE of the controlled oscillator 6. The period of this signal is a multiple of the period of the pulses of the ring counter 4. The signals arriving at the inputs of the controlled oscillator 6 differ between is a length that does not exceed the time interval between characters., -. . In the case when a symbol size code is received from a computer, shaper 7 produces control signals, by which the counting factor of counter 4 is changed. Device: The operation also works as above, only control of the generator 6 is carried out by pulses co-ordinated between ten with one and one-second mpulsamigshu, first one count 4 with an increase in the sign 2 times between the fifteenth and sixteenth / pulses with an increase in the sign 3 t and t, Deshy Fator 8 generates signals arriving at the input of the unit 5 Arranging image arrays for which the symbol generator issues the same highlighting program on the vertical raster lines twice a time by increasing the size of characters by 2 times, three times by increasing, the scientific research institute of character sizes by 3 times, etc. At the same time, the signal of the symbol size from the output of the decoder 8 is fed to the input of the r & i i clock clock pulses. This signal causes a decrease in the frequency / pulse following, which causes it. that the output of the generator is 3 sawtooth: the voltage will have a greater amplitude than in the mode without increasing the size of the symbols. Due to this, an increase in the vertical is proposed. The proposed device allows forming symbols of various sizes and corresponding distances between symbols and groups on the EUGG screen. Invention device for J displaying information on the screen of the electron-beam tube by: author. St. No. 414589, characterized in that, in order to expand the area of the cathode ray tube of symbols of different sizes, a control pulse generator, the first output of which is connected to one of the inputs of the ring counter, is inserted into it, the second w, the input of the character size decoder.