SU1173437A1 - Device for data display on the television set screen - Google Patents

Abstract

A DEVICE FOR DISPLAYING INFORMATION ON THE TELEVISION RECEIVER SCREEN, containing serially connected main memory unit, character generator, video driver, the output of which is connected to the television receiver input, and the second input - to the first output of the clock generator, the input of which is connected to the first clock generator output, the second output which is connected to the first input of the horizontal sampling counter, the output of which is connected to the input of the first decoder, the first output of which is connected to ne By the first input of the RAM unit, the second input of which is connected to the first output of the second decoder, the second output of which is connected to the second input of the character generator, and the input is connected to the output of the vertical sampling counter, the third input of the character generator is connected to the second output of the first decoder, characterized in that in order to expand the field of application of the device due to the possibility of displaying the smooth movement of information along the vertical, the serially connected frequency divider is inserted into it, The pulses of advance and the switch, the output of which i is connected to the first input of the vertical sampling counter, the input of the divider hour (Ltot is connected to the second output of the clock generator, the second input of the counter of vertical sampling and the second input of the driver of forward pulse, the third input of which is connected to the third output of the clock generator, the second input of the horizontal sampling counter and the second input of the switch, the third input of which is connected to the fourth output of the clock generator. 00 4 CO

Description

The invention relates to automation, computing and television technology and can be used in the display of character-graphic information on the screens of television receivers.

The purpose of the invention is to expand the field of application of the device by allowing the display of the smooth movement of information along the vertical screen of a television receiver.

FIG. 1 shows a functional diagram of the proposed device; in fig. 2 - functional scheme of the implementation of the driver pulse advance.

The device contains a block of RAM, intended for recording and storing, during regeneration on a television screen, codes of displayed symbols or graphic elements, a character generator 2 necessary to convert parallel codes of symbols or graphic elements read from block 1 into pulses of a beam of a CRT tube. shaper 3 video signals, performing the function of summing the pulses of the illumination of the beam of the cathode-ray tube with the full television clock signal and matching the full about a television signal according to electrical parameters with an input of a television receiver 4 intended for displaying symbolic graphic information on it, a divider 5 of a frequency necessary to set the most convenient for sensing the speed of movement on the screen of the displayed information, a forward pulse generator 6 for providing a variable the initial installation of the vertical counter / 1nogo discretization, switch 7, the counter 8 vertical sampling, designed to count the pulses of the GIS involved in the formation of the sweep function vertically, the second decoder 9, necessary for the formation of the vertical sweep function, the sync generator 10, which is used to form the television clock signal, as well as the incoming pulses of the OIG, OIG and short pulse, whose front coincides with the OEG front, clock generator 11, necessary for frequency generation, synchronizing the operation of all units of the device, a horizontal sampling counter 12 for counting horizontal sampling pulses, and the first decipher 13.

FIG. 1 denotes the entry 14 of the random access memory.

The device works as follows.

From input 14, signal codes are recorded in memory block 1, from which, with the frequency received from the first output of the first decoder 13, to the first input of block 1, depending on the number of characters displayed in one line of text

on the television receiver 4, they are fed to the input of the character generator 2. In the character generator 2, character codes are converted into pulses of illumination of a CRT beam.

The signals strobe the output of the pulses from the CRT beam from the sign generator 2 to the input of the video signal forming unit 3 are sent to the second input of the character generator 2 from the second output of the first decoder 13. The pulses determining the output

the character generator 2, the vertically-defined row of pulses of illumination of the CRT beam of the symbol decomposition matrix, arrives at the first input of the character generator 2 from the second output of the second decrypter 9 of the digital sweep function vertically. The video signal generator 3 performs the function of summing the CRT beam backlight pulses (during the forward running of the television sweep) with the television clock signal (which is fed to the second input of the video signal generator 3 from the first output of the clock generator 10), as well as the function of matching the output of the signal generator 3 of the video signal the input of the television receiver 4 by electrical parameters.

Counter 8 and counter 12 are performed

5 discretization of the digital scanning function vertically and horizontally.

The operation of a typical memory unit 1 in time is divided into two cycles: an information recording cycle and a reading cycle. Visually, a character string is displayed on the screen of the television receiver during the read cycle, and the spacing between the character strings is the write phase. When the discreteness of the frame damping pulse and the beginning of the reading phase, which is formed in the decoder 9 and fed from its first output to the second input of block 1, changes with discreteness of one television line, the displayed information moves to the vertical receiver on the television receiver 4. Mr. direction.

During the absence at the third input of the switch 7 of the frame extinguishing pulse, the first input of the switch 7 is connected to the first (being counting) input of the vertical sampling counter 8, to which the lowering damping pulses are received. During the presence at the third input of the switch 7 of the frame extinguishing pulse, the second input of the switch 7 is connected to the counting input of the vertical sampling counter 8, which is connected to the output of the forward pulse 6. The latter, when characters are vertically decomposed into nine elements located in nine adjacent television lines and the interval between character strings in three television lines, by the arrival at its first input of the first pulse from the output of the divider 5, some four frame outgoing pulses are output by four at the output, one lowering damping pulse, on the arrival of the second — two lowering damping pulses, on the arrival of the third — three lowercase damping pulses, etc. until the twelfth, with the arrival of the thirteenth, the cycle repeats.

Thus, each time after setting the vertical sampling counter 8 to zero, a short pulse during the front of the OIG, which is generated by the synchronizing generator 10 and from its fourth output, is fed to the second input of the vertical discretization counter 8, the latter is preset in time by the OIG to a certain initial state, which will determine the shift of the character string relative to the geometric edge of the screen of the television receiver 4 at the time of the beginning of the forward stroke of the television sweep. setting of the counter 8, and hence the shift varies with the frequency that is formed at the output of the frequency divider 5 by four, which is used for specifying the movement of text speed convenient for sensing operator. Pulses with a frequency of OIG to the input of the divider 5 are received from the fourth output of the clock generator 10. Pulses of the OIG to the second input of the driver 6 advance pulses are received from the third output of the clock generator 10, and short pulses, the beginning of which coincides with the beginning of the OIG, from the fourth output of the clock generator 10 are fed to the third the input of the driver 6 pulses ahead.

In order to achieve the continuous movement of information along the vertical of the screen of the television receiver 4, each time synchronously with the period of operation of the imaging unit 6, the advance pulses of the address of the read information array read from block 1 are shifted by a number equal to the number of familiarity in the line on the TV screen of the receiver 4.

One of the possible implementations of the driver for the advance pulse b is shown in FIG. 2

The driver circuit 6, consisting of And 15 and 17 elements, a counter 18, a counter 19, a decoder 20 and a trigger 16, works as follows.

Upon the arrival of the next pulse from the output of the divider 5 frequency to the inverse input

a binary counter 18, which serves to form a variable setpoint sequentially from 12 to 1 in binary code, on the installation input of the counter 19 which counts GIS pulses from 1 to 12, a binary code is set, starting with which it will count the GIS pulses. They arrive at the counting input of the counter 19 each time after the arrival of the leading edge of the OIG, which sets the trigger 16 into the unit state and thereby allows the passing of the GIS pulses through the AND 15 element to the input of the counter 19 and through the And 17 element to the generator of the forward pulse 6 . GIS pulses will pass until counter 19 counts

5 to 12 and the decoder 20 will not isolate this state and set trigger 16 and both counters 18 and 19 to the zero state.

The period of passage of the pulses of the OSP to the output of the driver 6 advance pulses with the arrival of each successive pulse to the inverse counting input of the counter 18 increases by the period of the OIG and ranges from one to twelve periods of the pulses of the OPS, and therefore, the output of the former 6 pulses of the advance will appear packets pulses from one to twelve. This is due to the fact that the meter 19 increases the period of its work from one period as the setting point decreases at its installation input from twelve to one

0 SGI to twelve, i.e., until decoder 20 installs both counters 18 and 19 and trigger 16, which forms the period of the passage of GIS pulses at the output of the former 6 forward pulses, to the zero state.

The proposed device allows

simply and reliably organize the mode of moving text, differs from the known one by significantly expanding the area of its use when displaying character-graphic information on television receivers screens, in universal character-graphic displays, teletext systems, in matrix-type display systems with line-by-line scanning using digital deployment functions. Standard black and white and color televisions can be used as TV receivers.

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Claims (1)

DEVICE FOR DISPLAYING INFORMATION ON THE SCREEN OF A TELEVISION RECEIVER, comprising a random-access memory block, a character generator, a video driver, the output of which is connected to the input of the television receiver, and the second input is connected to the first output of the clock generator, the input of which is connected to the first output of the clock generator, the second output of which connected to the first input of the horizontal sampling counter, the output of which is connected to the input of the first decoder, the first output of which is connected to the first the progress of the RAM block, the second input of which is connected to the first output of the second decoder, the second output of which is connected to the second input of the character generator, and the input to the output of the vertical sampling counter, the third input of the character generator is connected to the second output of the first decoder, characterized in that, for the purpose expanding the scope of the device by providing the ability to display the smooth movement of information vertically, series-connected frequency divider, pulse shaper are introduced into it the lead and the switch, the output of which is connected to the first input of the vertical sampling counter, the input of the frequency divider is connected to the second output of the sync generator, the second input of the vertical sampling counter and the second input of the timing pulse shaper, the third input of which is connected to the third output of the sync generator, the second input of the horizontal sampling counter and the second input of the switch, the third input of which is connected to the fourth output of the clock. Thebes /