SU1555912A1 - Device for shaping tv signals of outline and image of alphanumeric characters - Google Patents

Abstract

This invention relates to a communications technique. The purpose of the invention is to simplify the device. A device for generating television signals of a contour and images of alphanumeric characters contains a programmable memory device of 1 character, a programmable memory device 2 of a switching signal, a programmable memory device 3 of strobe pulses, parallel-to-serial converters 4, 5 and 6, D-trigger 7, el-t NOT 8 and 9, Element 2I-OR-NOT 10 and Element I-NOT 11. The goal is achieved by eliminating the contouring block and reducing the size of the memory blocks. 2 Il.

Description

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The invention relates to the communications industry and can be used in television direct printing devices (television synthesizers of marks), in broadcast television and high-definition television systems for generating television signals of the contour and image of alphanumeric characters with high-resolution television the quality of their mark.

The aim of the invention is to simplify the device by eliminating the contouring block and reducing the size of the memory blocks.

FIG. Figure 1 shows the structural electrical circuit of the device for generating television signals of a contour and images of alphanumeric characters; in fig. 2 - the image of the contour of the letter and the image of the letter O (the signs denote the elements of the contour of the sign from the output of the parallel-serial converter k, the sign a - the delayed elements of the contour of the sign from the 25 outputs of the D-flip-flop).

A device for generating television signals of a contour and images of alphanumeric characters contains a programmable memory (ROM) of 1 character, a ROM of a 2 switching signal, a ROM of 3 strobe pulses, the first k, the second 3 and the third 6 parallel-to-serial converters, D-flip-flop 7 , the first and second elements are NOT 8 and E, element 2I-OR-35 is NOT 10, element IS NOT 11.

A device for generating television (TV) contour signals and images of alphanumeric characters works as follows.

The ROM 1 and the parallel-to-serial converter k and their connections to an external source of signals of the line code, symbol code, clock pulses and frequency pulses form a well-known television character generator.

Clock pulses, familiarity pulses, a character code and a line code come from an external source in synchronization with the lower synchronization pulses of a hardware-studio unit.

In the device ROM 1, the outline of alphanumeric characters is programmed. The selection from the memory of the ROM 55 1 of the matrix of elements of one or another character is carried out by a character code. The highest bit of the character code identifies

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pack 25

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55

thirty

40

45

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matrix of character elements for the 1st or 2nd floor of the television frame.

We consider the device operation by the example of generating the contour signals and the image of the letter 0. The letter 0 in the matrix of elements kO x 32 is shown in FIG. 2

The lower bits of ROM 1 receive the line code, according to which the outputs of ROM 1 are given a signal of the character string element code, which is entered into the parallel-serial converter A by a familiarity pulse, from which then as a serial signal is output by clock pulses to the input of a parallel signal of the serial converter 4; From the output of the parallel-serial converter 4, the signal is fed to the information input of the D-trigger 7; the inverse clock and the same input to the synchronization input of the D-trigger pulses fT. At the output of the D-flip-flop 7, the signal will be delayed by 1/2 of the clock frequency relative to the input signal.

In ROM 2 of the switching signal, a signal is programmed, with which the device can be switched to the output device of a 0.5 Tt delayed or non-delayed sign contour signal. The number of bits (outputs) of ROM 2 must correspond to the maximum possible number of video pulses on the row of the elements of the mark. For the Russian alphabet, the size of the ROM 2 on the outputs must be 6. If it is necessary to delay a video pulse in the signal of the character string, the corresponding output of ROM 2 is programmed to logical 1, if there is no delay, logical O. The first output of ROM 2 corresponds to the first video pulse, the second one the second, etc. The code from the ROM 2 is fed to the inputs of the parallel-to-serial converter 5 and is entered by a familiarity pulse. The signal in the parallel-to-serial converter 5 is shifted to the output by non-delayed video pulses of the signal. Switching delayed and not delayed video pulses of the image signal to the output of the device is carried out using a logic element 2I-2, OR-NOT 10. At the first inputs of the elements, AND are received delayed and not

held video image signal contour of the sign. The second inputs of the elements And receive the switching signals of the corresponding polarity from the output of the parallel-serial converter 5.

In ROM 3, the strobe signals are programmed, using which the image signal is extracted from the TV signal of the contour of the characters. The number of bits at the output of ROM 3 must correspond to the maximum possible number of video pulses on the row of the elements of the mark. If after the video impulse of the contour there is a sign image, then the logic output 1 is programmed according to the output of ROM 3, corresponding to this video impulse, if the image is absent, the logical O signal is programmed

The code from ROM 3 is fed to the inputs of the parallel-to-serial converter 6 and is entered into it by a familiarity pulse. The signal in the parallel-to-serial converter 6 is shifted to the output by the video pulses of the inverse signal of the contour of the sign. Gating the image signal of the character from the signal of the character contour is performed using the AND-NOT 11 logic element. The signal of the character contour is fed to the first input of the NAND 11 element, and the second signal to the strobe signal from the output of the parallel-to-serial converter 6. The NE-11 TV sign signal is output to the device.

invention formula

An apparatus for generating television signals of a contour and images of alphanumeric characters, comprising serially connected programmable storage device (ROM) of a character whose address inputs are inputs of a line code and a code of signs of a device forming a television (TV) contour signals and images of alphanumeric characters

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and the first parallel-serial converter, to the clock input and recording resolution input of which the corresponding inputs of the device for forming TV contour signals and images of alphanumeric characters are connected, in order to simplify the device by eliminating the contour block and reducing T, a D-flip-flop is entered, to the clock and information inputs of which are connected respectively the inverse clock frequency input of the device for forming TV contour signals and images Favorite digital characters and the output of the first parallel-serial converter, serially connected switching signal ROM, to the address inputs of which the corresponding inputs of the character ROM, the second parallel-serial converter are connected, to the recording enable input and the clock input of which the corresponding parallel input and output are connected serial converter, the first element is NOT, element 2I-OR-NOT, to the second, third and fourth inputs of which are connected respectively to the output The first and second parallel-to-serial converters and the D-flip-flop output, and the second element are NOT, as well as series-connected ROM of building pulses, to the address inputs of which the corresponding inputs of the character ROM, the third parallel-to-serial converter are connected, to the write enable input and the clock input of which is connected respectively to the input of the first parallel-to-serial converter and the output of the second element NOT, and the NAND element, to the other input of which the output of the 2I- element is connected DO-NOT, which is an output signal circuit TV characters forming device circuit TV image signals and alphanumeric characters, the second output of which is the output of AND-NO.

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NN elements of character string

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Claims (1)

The claims and the first parallel-serial converter, to the clock input and the recording permission input of which the corresponding inputs of the device for generating the TV circuit signals and image of alphanumeric characters are connected, characterized in that, in order to simplify the device by eliminating the contouring unit and reducing the volume of memory blocks , a D-trigger is introduced, to the clock and information inputs of which the inverse clock frequency input of the TV signal generation device is connected respectively and images of alphanumeric characters and the output of the first parallel-serial converter, connected in series to the ROM of the switching signal, to the address inputs of which the corresponding inputs of the ROM of the sign are connected, the second parallel-serial converter, to the recording permission input and the clock input of which the corresponding input and output of the first parallel-serial converter, the first element is NOT, the element 2 AND-OR-NOT, to the second, third and fourth inputs of which are connected respectively the outputs of the first and second parallel-serial converters and the output of the D-flip-flop, and the second element NOT, as well as series-connected ROMs of the building pulses, to the address inputs of which are connected the corresponding inputs of the ROM of the sign, the third parallel-serial converter, to the recording resolution input and the clock input of which the input of the first device for the formation of television circuit signals and images of alphanumeric characters, respectively, containing Ammiruemable memory device (ROM) of the sign, the address inputs of which are the inputs of the line code and the character code of the device for generating television (TV) signals of the circuit and the image of alphanumeric characters, the second parallel-serial converter and the output of the second element NOT, and the AND element, to another · the input of which the output of the 2AND-OR-NOT element is connected, which is the output of the TV signal of the circuit of the signs of the device for generating the TV signals of the circuit and the image of alphanumeric characters, the second output of which is The output of the AND-NOT.