SU982075A1 - Device for displaying symbol information on television screen - Google Patents

Description

one

The invention relates to automation and computing and can be used to display character information on a television screen.

A device is known for outputting symbol information to a television screen comprising two vertical sampling counters connected via a switch to a character generator, and synchronizer 1.

However, this device does not allow a vertical symbol shift by an amount less than the height of the familiarity.

Closest to the present invention is a television-type display comprising a serially connected addressing unit, a memory unit, a symbol code register and a digital-to-analog converter, another input of which is connected to a character generator associated with the output of the cm, tally code register, paralleled by it and serially connected the synchronous generator, the second output connected to the addressing unit, and the third output to the digital-to-analog converter, controlled frequency divider and counter, mode code register, input E is connected to the output of the memory unit and output addressing, and

the output is with the second input of the controlled frequency divider and the input of the synchronous generator and the shift value register connected to the output of the memory block 2.

The disadvantages of this device are the lack of a vertical symbol shift with standard horizontal scan and the inability to display and vertical shift of symbols of reduced height in the same line with the symbols of the main height.

The purpose of the invention is to expand the functionality of the device by displaying multi-scale characters with a vertical shift.

The goal is achieved by the fact that 15 into a device comprising a serially connected addressing block, a memory block, a symbol code register and a digital-to-analog converter, another input of which is connected to a character generator connected to the output of the symbol code register, connected in parallel to them and connected in series with a sync generator, the second output is connected to the addressing unit, and the third output is connected to the digital-to-analog converter, the controlled frequency divider and the counter, the mode code register, the inputs connected to The output of the memory unit and the output of the addressing unit, and the output with the second input of the controlled divider clock and the input of the synchronous generator, and the shift value register connected to the output of the memory unit, introduced a combinational adder, a discriminator, a switch, the second controlled frequency divider and the second counter, while the first input of the combinational adder is connected to the output of the shift amount register, its second input is connected to the output of the first counter, and the output is connected to the first input of the switch, the other input of which is connected to the output second counter, the control inputs of the switch are connected to the mode code register and the discriminator input connected to the output of the combinational adder, the switch outputs are connected to a digital-to-analog converter and character generator, the second counter input is connected to the output of the second controlled frequency divider, the inputs of which are combined with the corresponding inputs of the first a controlled frequency divider, and a switch for resetting the second counter is connected to the output of the combinational adder.

FIG. 1 is a block diagram of a device for outputting symbol information to a television screen; in fig. 2 - an example of the vertical shift of the symbol of the main display; in fig. 3 shows an example of the display and vertical shift of a reduced height symbol (a “small symbol” in one line with a symbol of the main height {“large symbol”).

The device for outputting character information to a television screen contains an addressing unit 1, a memory unit 2, a symbol code register 3, a digital-to-analog converter 4, a character generator 5, a clock generator 6, a first controlled frequency divider 7, a first counter 8, a shift register 10, a combinational an adder 11, a discriminator 12, a switch 13, a second controlled frequency divider 14, a second counter 15.

The discriminator 12 is a threshold logic circuit, the output of which D ("O or" 1) is determined by the value S at its input: D O if S 1 or S m; D 1 if m S 1, where m is the upper threshold value equal to the number of rows in the matrix of the symbol, the lower threshold being 1. Switch 13 is a combinational multiplexer. From two directions into one. The first and second inputs of the switch 13, respectively connected to the combinational adder 11 and the second counter 15, are informational. The signal at the control input of the switch 13 connected to the mode code register 9 determines the choice of one of the two switched directions, and the signal at the control input connected to the discriminator 12 determines the signal value ("O or" 1) at the switch output 13 associated with a digital-to-analog converter. four.

The device works as follows.

The code equivalent of the image from the source of information enters memory block 2 and is cyclically read synchronously with the television scan. The output word of block 2, containing the character code (the character number in the alphabet stored in character generator 5), the mode code determining the size of the character, and the value of the vertical character shift within the familiarity, are written to the registers 3, 9, and 10, respectively.

In accordance with the symbol code and the current row number of the matrix of the symbol, the character generator 5 outputs the code of the current row of the matrix of the symbol to the input of the D / A converter 4. Transducer 4 generates a video signal that is blocked to form a space (background) with a signal from the output of the switch 13 in the familiarity zone that is not occupied by the image of the shifted symbol.

The line number of the matrix of the symbol, which is input to the character generator 5 from the output of the switch 13, is formed as follows.

The controlled frequency dividers 7 and 14, in accordance with the division factor received at their inputs from the output of the register 9 of the mode code, divide the frequency of the television lines defined by the clock generator b and produce the sync pulses of the horizontal video lines of the image, which are fed to the counters 8 as counting pulses. and 15 respectively. This sets the number of television lines in the video line, which in turn determines the vertical scale of the image.

Counters 8 and 15 are considered modulo m equal to the number of rows in the matrix of a symbol (the number of video lines in a character string). In the examples in FIG. 2 and 3 m 10. The content of the V counter 8 is the video line number in the familiar "large character".

The row number of the large character matrix is formed by the combinational adder 11 as the sum S of the contents V of the counter 8 and the contents of the shift value register 10.

The row number of the matrix "small symbol" to the contents of the counter 15, triggered by a signal on the reset bus, when the value S reaches a fixed value So (in the example in Fig. 3 So 5).

The switch 13 transmits to the input of the character generator 5 the signals of the matrix row number for either a large or a small symbol depending on the size attribute value supplied to its control input from the register 9 of the mode code.

The value of the blocking signal supplied to the digital-to-analog converter 4 from the output of the switch 13 is fully determined by the output signal D of the discriminator 12.

 The shifted "big character is located on two familiarities vertically (n- and n + 1) - the character strings in FIG. 2). At the same time, for the upper familiarity code, the shift amount code is set as a number (-A), and for the lower familiarity as a number m-D, where A is the number of video lines by which the symbol should be shifted, with m D 0. Number (-A) is stored in the register of 10 shift values in the additional code. In the example of FIG. 2 D 4 code shift value for the character located in the n-th character string is -4, and for the character in (n + 1) -th line - 6 10 - 4. For different characters of the same character string value code shear is set independently.

A shift by the matrix D value. "A small symbol is reached by the fact that at the output of the adder 11, the value S So appears (and starts the counter 15) on the video line for which V So is A (example of Fig. 3).

The effect of the invention is to expand the visual possibilities. With the standard horizontal scan, the proposed device allows a vertical symbol shift, and also has the ability to display and vertical shift various-scale characters in different familiarities with an independent setting of the symbol size and shift value.

Claims (2)

Invention Formula A device for outputting character information to a television screen containing serially connected addressing units, memory blocks, a symbol code register and a digital-to-analog converter, another input of which is connected to a character generator connected to the output of a symbol code register, paired with them, connected and sequentially connected sync generator , the second output is connected to the addressing unit, and the third output - to a digital-to-analog converter, a controlled frequency divider and a counter, a mode code register, inputs connected to the output of the memory unit and the output of the addressing unit, and the output to the second input of the controlled frequency divider and the sync generator input and shift register connected to the output of the memory unit, in order to expand the functionality of the device by displaying vertically shifted multi-scale symbols, a combinational adder, a discriminator, a switch, a second controlled frequency divider and a second counter are entered into it, the first input of the combinational adder is connected the output of the shift value register, its second input is connected to the output of the first counter, and the output is connected to the first input of the switch, another input of which is connected to the output of the second counter, the control inputs of the switch are connected to the mode code register and the discriminator connected to the output of the combinational adder, the switch outputs are connected to a digital-to-analog converter and a signal generator, the input of the second counter is connected to the output of the second controlled frequency divider, the inputs of which are combined with the corresponding the inputs of the first controlled frequency divider, and the tune reset of the second counter is connected to the output of the combinational adder. Sources of information accepted in the investigation 5 1. Television methods and information display devices. Collection of ed. MI Krivosheev. M., “Soviet Radio, 1975, p. 63, fig. 7 2. US Patent No. 3781850, cl. 340-324, 1973 (prototype). i, ocrepytcuU3o Gfyfce c e. iVoe. / utfcc 8 v LA C (/ ff / o uMffff c / p / yhss Yj-jf uHaojriffO / f t / eocl .g Exit / c-tjo CyHMOfnO / yf / tfnO / OCC i flO. // S . D.i O / n. . G n / ooS -f L zv J