SU1474726A1 - Video signal generator - Google Patents

Abstract

The invention relates to automation and computer technology and can be used in information display devices on a television display screen. The purpose of the invention is to simplify the device by reducing the amount of memory. The device contains the first 1 and second 2 address counters, the first 3 and second 4 blocks of RAM, and AND 5 with the corresponding links. In the first block 3 of the RAM, there are indications of a change in chromaticity along the lines of the register, and in the second block 4 of the memory, tables of the chromaticity codes. The first address counter 1 generates the addresses for the first RAM block 3 in synchronization with the television scan. When a sign of a color change appears at the output of the first memory unit 3, an output is generated at the output of the element 5, increasing the content of the second counter 2 of the address, which ensures that the new color code is read from the second memory section 4. 1 il.

Description

Ј -4

Ј 1 Yu

OS

The invention relates to automation and computer technology and is intended for use in systems displaying information on the screen of a body in from other indications of a computer.

The purpose of the invention is to simplify the device.

The drawing shows the function block diagram of the device.

The device contains the first 1 and second 2 address counters, the first 3 and second 4 blocks of RAM, the element And 5.

The device works as follows.

The first address counter 1 generates address codes for accessing the first memory block 3. At the counting input of the counter 1 address, a horizontal sampling signal is received, which is synchronous with the television scan. The capacity of counter 1 is determined by the resolution of the raster used. So, with a raster of 512,512 display elements

ten, 18 The capacity of counter 1 is z bits.

In the initial state, the counter 1 is in the zero state. When posting a horizontal sampling signal to its counting input, with the beginning of the visible part of the first raster line, the counter starts counting. The address signal taken from the output of the first counter 1 is fed to the input of the first memory block 3. The first block of 3 memories is intended for storing the bitmap of changing the chromaticity of the display elements in the image frame. The capacity of the block, the memory is determined by the discreteness of the raster and is equal to Kr-Ne-1 bit, where Nr is the number of display elements in the raster line; Na is the number of lines of the raster. If the chromaticity codes of each subsequent display element differ from the previous one, the unit in the corresponding memory cell is recorded, and if the chromaticity codes are equal, zero. From the output of the first block 3 of the memory, information on changing the color of the display elements arrives at the first input of the element 5.

Element I 5 is intended for forming counting pulses arriving at the clock input of the second counter 2 addresses. A counting impulse is formed at a single potential at

the first input element And 5 and arriving at its second input delayed pulse horizontal sampling.

The second address counter 2 forms the address code of the second memory block 4. The capacity 2 addresses ensures the formation of the address code of any cell of the memory block 4. In the initial state, the second counter 2 of the address is set by a frame damping pulse, which is fed to the reset input of the counter 2.

The second memory block 4 is designed to store the color codes of the display elements. They are stored in memory cells in the form of an array, where each subsequent code is different from the previous one and corresponds to one or a group of neighboring display elements with the same chromaticity in the scanning direction of the television scan. The cell width of the memory block 4 is determined by the chrominance code width.

Thus, the invention provides a simplification of the device by reducing the amount of memory needed to store the color characteristics of the image.

Claims (1)

Invention Formula A device for generating a video signal containing the first and second address counters, the first and second RAM blocks, the output of the second address counter is connected to the address input of the second RAM block, the output of which is the output of the chrominance codes of the device whose clock input is the clock input The first address counter, the reset input of the second address counter, is the device reset input, characterized in that, in order to simplify the device, it contains an AND element whose first input is connected to the output row of the first block RAM memory, an address input coupled to an output of the first account, - snip addresses, the clock input of the second address counter connected to the output of the AND, the second input of which is the strobe input device.