SU1261003A2 - Device for displaying information on screen of television receiver - Google Patents

Abstract

The invention relates to the field of automation and computer technology, as well as to the printing industry, and can be used in the construction of television displays for displaying and editing textual information using standard television receivers and is an improvement of the device according to A. No. 978186. The purpose of the invention is to improve the accuracy of the device by equalizing the luminance brightness of character elements, which is achieved by introducing n NOT and AND elements, where n is the number of horizontal decomposition elements of the sign, and the second shift register with the corresponding functional connections. 1 il. tc oi go

Description

The invention relates to automation and computing, as well as to the printing industry, can be used in the construction of television displays to display and edit textual information. using standard television receivers and is an improvement of the device according to aut. St. No. 978186.

The purpose of the invention is to improve the accuracy of the device by equalizing the brightness of the elements of characters.

The drawing shows a block diagram of the proposed device.

The device contains the first memory block 1, character generator 2, the third decoder 3, the second memory block 4, the fourth decoder 5, the controlled frequency divider 6, the AND block 7, the 8 line counter, the first decoder 9, the first block of the 10 elements OR, the switch 11, the second block 12 elements OR, the generator 13 clock pulses, the divider frequency 14, the first shift register 15, the television receiver 16, the second decoder 17, the first element And 18, subtractive counter 19, the fifth decoder 20, the second element And 21 , and elements are NOT 22, n elements are And 23. second shift register 24

The device works in the following way.

In memory block 1, text information is stored sequentially. At each address, a code of the sign of the text and a code of the size of the mark, measured in the number of television lines (TVS) of the mark sweep, are recorded. The address at the end of the group of codes for each line of text contains the command code for vertical mixing, a line of text, and a code for the vertical offset of the beginning of the next, line of text for it, measured also in the number of FAs. On the screen of the television receiver 16 lines of text are reproduced. TVM numbering is performed within each line of text upwards from O to .- 1. which corresponds to a change in the code in the counter of 8 lines, which is a subtractive counter, and from K.- 1 to O when the television raster is scanned from top to bottom (K is the vertical offset of the beginning of the displayed line of text). Before starting to play each new line of text, when the zero fuel assembly of the previous line of text is scanned, the counter of 8 lines is in the "O" state. At the output of the decoder 17, the signal "1" appears, which is fed to the single input of the And 18 element. Then at the time of polling the cell of the memory block 1 containing the command and the value of the vertical offset, the output of the decoder 3 appears the signal "1. As a result, the signal "1" appears at the output of AND 18, enabling the write of the offset value code from memory block 1 through the block of AND elements 7 to the counter of 8 lines. On

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the counter of 8 lines is the arrival of t-line sync pulses from the generator of 13 clock pulses. From the outputs of the counter of 8 lines, the code goes to the decoder 9, at the outputs of which sequentially the signals from the fuel assembly from K-ax. 1 to 0 are triggered.

When playing a line of text with minimum size signs, the TVS signals from the output of the decoder 9 pass through a block of 10 OR elements, a switch 11 and a block 12

 elements OR to character generator 2, carried out a survey on the rows of the matrix of the sign. In accordance with the selected row of the matrix and the character code received from memory block 1, character generator 2 is shifted in parallel to the shift register 15 by element-wise decomposition of the character on a particular line. The clock input of the shift register 15 of the frequency divider 14 receives signals of the shift frequency corresponding to the frequency of the element-wise decomposition

0 character outlines horizontally.

From the output of the shift register 15, the video signal is fed to the television receiver 16. The width of typographic marks (field signs) takes discrete values with a step S smaller than the dimensions of the television decomposition element A. It is always possible to choose the parameters of the decomposition of the characters and the width measurement step will be an integer number: p D / 6.

The width of the signs is expressed in the number of elements of width b in the horizontal dimensions of the sign fields (where p is 1, 2, 3, etc.). Binary character width codes are stored in memory block 4. At the beginning of the character line scan, the character code that arrives at

The character generator 2 simultaneously arrives at memory block 4, from which the width code is read and written to the subtractive counter 19, which is previously in the "O" state. At the output of the decoder 20 having an inverting output, the signal "O" disappears. and the signal "1" appears, which is fed to the element 21 and allows the passage of pulses from the output of controlled frequency divider 6 to the subtracting counter 9. With the arrival of each pulse, the code in counter 19 decreases by one. When the code becomes equal to zero, at the output of the decoder 20, the Vits signal “O, which will stop the flow of pulses through the AND 21 element into the counter 19. The same signal received at

- an input of the initial installation of the frequency divider 14, resets it to the initial state. In addition, the signal "O from the output of the decoder 20 is fed to the input of the interrogation of the memory block 1 by the signs and carries out the transition to reading the next code

5 characters. At the same time, the width code of this character is entered from the memory block 4 into the subtractive counter 19, and the device operation cycle is repeated. The frequency divider 14 has

the division factor, equal to p, is used to form the shift frequency signals supplied to the shift register 15.

Thus, the imaging of signs is carried out from the elements of a television scan, and the formation of horizontal dimensions of sign fields is based on the character width codes. Changing the vertical size of the characters is done by repeatedly reading the rows of matrixes of characters.

The minimum size of the reproduced characters, expressed in the number of FAs, is equal to the number of rows of the matrix K, Repeating the zero row of the matrix allows to get the size 1, zero and the first / (m - | - 2, etc. to size 2 / C, when all the rows of the matrix are repeated. To get the sizes from the pre-matrix lines, the rows of the matrix are repeated three times, starting with the bullet line.

Block 10 elements OR provides a logical addition of signals from adjacent fuel assemblies. From the output of the block 10 elements OR to the switch 11, in addition to the signals obtained by the logical addition of adjacent FAs, TVS signals also arrive. The code for the size of the character comes from the output of memory block 1 to the decoder 5, the output signals of which in switch 11 select the TVS signals necessary to interrogate the rows of the matrix when generating characters of a certain size. In block 12 of the OR elements, signals are combined from the outputs of the switch 11 related to the same rows of the matrix. The number of elements OR is equal to the number of rows of the matrix of characters. The change in the horizontal dimensions of the signs is made by a controlled frequency divider b, changing in proportion to the code size of the character size the period of the pulses applied to the element 21 and the frequency divider 14.

The alignment of the brightness of the elements of the characters is as follows. From the character generator 2, elementwise decomposition of the character on a certain line in the form of a positional code enters the inputs and the HE elements 22 and the first inputs of the n And 23 elements. The signal "1 at the output of the i-ro element And 23 appears in the event that all signals at its inputs are equal to "1. This will be the case if the i-th bit of the position code corresponding to the c-th element of the sign in the matrix row is equal to "1 (" 1 is the signal of displaying the element of the sign element), and the signals arriving at the other inputs of the i-ro element And 23 from the outputs of the (i-1) -th and (i-4-l) -ro elements of the HE 22 will also

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equal to "1, i.e. The (i-1) -th and (i + 1) -and position bits of the positional code will be equal to "O (sign element quench signal). Thus, in the second shift register 24 from the outputs J of the elements AND 23 in each scan line, a position code is written for each character, the i-th bit of which is equal to "1 only if the character decomposition of the character from the output of the character generator 2 (1 -1) -th and (1- | -1) -th bit are equal to “O, i.e.

0 when the i-th element of the sign decomposition is single. The shift input of the shift register 24 receives shift signals corresponding to the element-by-element decomposition frequency of the characters in the horizontal direction. As a result, a correction video signal is generated at the output of the shift register 24, operating synchronously with the shift register 15. This video signal is fed to the auxiliary input of a television receiver, the cascade of the video signal is made in this way (for example, it has a resistor divider at the input or is equipped with an additional video signal input point), which increases the brightness of single character elements to an average value equal to

5 value for horizontal lines.

Thus, the alignment of the brightness of the elements of the sign occurs. Horizontal, vertical and diagonal strokes, as well as individual elements of the characters, have the same brightness. Brightness equalization occurs for all shapes and sizes of characters.

Claims (1)

Invention Formula , A device for displaying information on the screen of a television receiver by aut. St. No. 978186, characterized in that, in order to increase the accuracy of the device by leveling the luminance of the elements of characters, the elements NOT, n. elements And, where l is the number of elements of the decomposition of the sign horizontally, and the second shift register, the outputs of the character generator are connected to the inputs of the elements NOT and the first inputs of the elements AND, the outputs of the second and (n-1) -th elements 5 are NOT connected to the second inputs of the first and the last element AND, the second input of each i-ro element AND is connected to the output (il) -ro of the element NO, and the third input of the i-ro element AND is connected to the output (ill) -ro of the element NO, where i 2, ..., p-1, the outputs of the elements And are connected to the corresponding inputs of the second shift register, the output of which is connected to the input of the television receiver, and the input of the first shift register is connected to the input of the second shift register. H