RU2464725C1 - Device and method to display television video information on computer monitor screen - Google Patents

Abstract

FIELD: information technologies.

SUBSTANCE: device to display television video information generated by a sensor 1 of a TV signal on a computer monitor screen comprises a converter 2 of a TV signal and a computer monitor 3. The converter 2 of the TV signal comprises an ADC 201, a DAC 209, a synchronous dynamic main memory 204, an input 213 and an output buffer 216 and a reference frequency generator 206, by means of which a TV signal is converted directly into signals VGA (SVGA, XGA) by recording of a digitised video signal in a real time mode into a synchronous dynamic device - main memory 204 and its reading from a synchronous dynamic main memory in VGA standard.

EFFECT: display of video information on screens of conventional computer monitors that is produced in television surveillance systems for facilities tracking with progressive layouts, nonstandard frequencies of lines and frames, without computer usage.

2 cl, 2 dwg

Description

The proposed technical solution relates to television technology and can be used in television systems for monitoring various (point or extended) objects: both in stand-alone closed-circuit television systems and in television systems as part of optoelectronic complexes.

The display of video information in television (TV) systems of the broadcast standard (with interlaced decomposition of the image) is carried out using well-known video monitoring devices (VKU). In TV monitoring systems with other standards, for example, with progressive (progressive) scanning of an image, special VKUs are developed for displaying video information for each specific standard of a TV sensor [A.E. Vereshkin. Television equipment of the optoelectronic complex "Window". "Questions of radio electronics." Series "Technique of Television", 2006, issue 1]. As an alternative to displaying video information in non-standard TV surveillance systems, standard computer monitors have also recently begun to be used everywhere; for this, the TV signal is input into a computer in which the TV signal is converted into VGA (SVGA, XGA) signals perceived by the computer monitor programmatically .

As a prototype, a technical solution was made, described in RF patent No. 2216120 for an invention with a priority of July 28, 2000, “Device and method for matching video information in a computer system”, which describes a computer device for displaying video information. The video signal is input into a computer device in which "synchronization of the synchronization modes in the incoming video signal and in the monitor used is made."

The disadvantages of a computer-based method for displaying video information include the need to develop a device for inputting a television signal into a computer and corresponding software, which is a difficult task for displaying video information in real time, and the relative operational complication of video information display equipment for such closed-circuit television systems for which the computer does not need to operate , as well as as part of special products operating in severe climatic conditions The requirements that a computer must satisfy.

The technical result of the proposed technical solution is to eliminate the shortcomings of the computer-based method for displaying video information, simplifying the task of displaying on the screens of standard computer monitors video information generated in television systems for monitoring objects with progressive scans, non-standard line and frame frequencies, without using a computer, by directly converting the television signal in hardware VGA signals (SVGA, XGA) and thus both baking the video display over a wide range of climatic conditions in a small volume of equipment available at its operation unskilled personnel.

This is achieved by the fact that the device for displaying television video information on a computer monitor screen is characterized in that it contains a television signal converter, consisting of an analog-to-digital converter of the input video signal, the output of which is connected through the input FIFO (first-in, first-out) buffer to the controller input write-read video data, the input-output of which is connected to the input-output of synchronous dynamic RAM, the second input of the controller write-read video data is connected to the output of the address multiplexer write-read video data, and the third input is to the output of the reference frequency generator, the output of the video write-read controller through the FIFO output buffer is connected to the input of the RGB output register, the three outputs of which are connected to the corresponding inputs of the three-channel digital-to-analog converter, the outputs of which are connected to the signal input of the computer monitor, the first of the two inputs of the multiplexer addresses of the write-read video data is connected to the output of the counter of the write address, and the second to the output of the counter of the read address, two inputs of the recording counter with horizontal and frame synchronization signals are connected to the corresponding outputs of the video data selection controller, the third output of which is connected to the inputs of the analog-to-digital converter of the input video signal and input FIFO buffer, respectively, two inputs of the read address counter are connected to two outputs of the VGA synchronization controller with VGA horizontal and frame synchronization signals, the third output of which is connected to the inputs of the output FIFO buffer, output RGB register and three-channel digital output converter, respectively, and the fourth and fifth outputs are to the corresponding inputs of the output buffer of the computer monitor synchronization signals, two inputs of the video data selection controller are connected through the input buffer to the outputs of the television signal sensor by the synchronization signals of lines (SSI) and frames (CSI), and the third input the video data selection controller is connected to the output of the reference frequency divider, the input of which is connected to the output of the reference frequency generator, the output of which is also connected to the input of the synchronization controller VGA and the input of the controller write-read video data.

The proposed method for displaying television video information on a computer monitor screen contains the operations of the main device and consists in converting the TV signal directly to VGA (SVGA, XGA) signals by recording the real-time digitized video signal into RAM synchronous dynamic storage and reading it from synchronous dynamic RAM in the VGA standard.

To achieve this result, the video signal received from the TV signal sensor is converted into digital form with a certain sampling clock rate, buffered to generate digital data packets necessary for recording the digitized video signal in synchronous dynamic RAM, and the digitized video signal is recorded in such a way line-by-line in synchronous dynamic RAM in the standard specified by the horizontal and frame synchronization signals of the TV signal sensor, at the same time they produce continuous and independent reading from a synchronous dynamic RAM digital data of a video signal in another standard, which operates on a computer monitor (VGA standard), in packets that are converted into a continuous stream of digital codes in the output FIFO buffer and then into digital color signals (RGB signals), the latter are converted into digital-analog converter into analog RGB signals and fed to the signal input of a computer monitor, form horizontal and vertical synchronization signals VGA, which are used to control the read mode of the recording ik- synchronous DRAM video data in the standard work and the computer monitor for a computer display when displayed on a video screen, issued by the sensor TV signal (TV system).

The essence of the claimed device and method is illustrated by drawings.

Figure 1 shows a generalized functional diagram demonstrating in principle a method for displaying television video information on a computer monitor screen.

Figure 2 shows a detailed structural diagram of the proposed device for displaying television video on the screen of a computer monitor.

A device and method for displaying television video information on a computer monitor screen are implemented as follows.

A device for displaying television video information provided by the TV signal sensor 1 on the computer monitor screen comprises a TV signal converter 2 and a computer monitor 3. The TV signal converter 2 comprises an analog-to-digital converter ADC 201 of the input video signal, the output of which is connected through the FIFO input buffer 202 to the controller 203 write-read video data, which is connected to synchronous dynamic RAM 204, with a multiplexer 205 addresses write and read video data, with a generator 206 of the reference frequency. The output of the controller 203 write-read video through the output FIFO buffer 207 is connected to the output RGB register 208, the three outputs of which are connected to the corresponding inputs of the three-channel digital-to-analog converter DAC 209. The outputs of the DAC 209 are connected to the signal input of the computer monitor 3. The first of the two inputs of the address multiplexer 205 write-read is connected to the output of the counter 210 of the write address, and the second input to the output of the counter 211 of the read address. Two inputs of the write address counter 210 (with synchronization signals SSI, KSI) are connected to the corresponding outputs of the video data selection controller 212, in which the third output is connected to the inputs of the ADC 201 and the input FIFO buffer 202. Two inputs of the read address counter 211 are connected to two outputs of the controller 215 VGA sync (with VGA line and frame sync signals). Two inputs of the video data selection controller 212 are connected through the input buffer 213 to the outputs of the television signal sensor 1 by the synchronization signals of lines (SSI) and frames (CSI), and the third input of the video data controller 212 is connected to the output of the reference frequency divider 214, the input of which is connected to the output a reference frequency generator 206. The output of the reference frequency generator 206 is also connected to the controller 203 write-read video data and to the input of the controller 215 synchronization VGA. One output of the VGA synchronization controller 215 is connected to the inputs of the output FIFO buffer 207, the output RGB register 208 and the DAC 209, and the other two outputs are connected to the corresponding inputs of the output buffer 216 of the synchronization signals of the computer monitor 3.

A device for displaying television video information on a computer monitor screen operates as follows.

The input video signal is fed to the ADC 201, the output of which digitized discrete values (codes) of the video signal are transmitted through the input FIFO buffer 202 to the controller 203 write-read video data and through it to record in synchronous dynamic RAM 204. The input FIFO buffer 202 ensures the continuity of recording of the digitized video signal , forming for transmission to the synchronous dynamic RAM 204 video data in packets, for example, 64 samples. The clock frequency PM1 of the video sampling signal, phased by lower-case clock synchronizing pulses of the SSI coming from the TV system through the input buffer 213, is formed in the controller 212 of the video data selection from the reference frequency signal of the frequency bandwidth coming from the generator 206 of the reference frequency through the divider 214 of the reference frequency. To the controller 203 write-read video data also receives a continuous signal of the reference frequency of the OCH from the generator 206 of the reference frequency and through the multiplexer 205 addresses of write-read address codes in synchronous dynamic RAM 204: from the counter 210 of the write address, the address code for recording discrete values of the video signal, synchronized by the SSI, CSI signals, and from the read address counter 211, the read address code in the VGA standard, which is determined by the VGA synchronization signals in rows (horizontally) of the SS and in frames (vertically) u) SC generated in the controller 215 VGA synchronization.

The controller 203 write-read video data controls the write and read discrete values of the video signal in the synchronous dynamic RAM 204, transmits to the record and receives the video data during reading. The input data of the current frame is continuously, line by line, written to the synchronous dynamic RAM 204, where it is stored until the next frame arrives. The recording and reading speeds of the video data are different and correspond to the parameters of the input video signal and the output signal for VGA. The conversion of the video signal by line is obtained due to the difference in the read and write speeds of the video data, and the conversion of the sequence of lines is provided by the counters 210, 211 of the write address and the read address.

The color signals for the VGA computer monitor 3 are issued by the video recording / reading controller 203 through the FIFO output buffer 207, which ensures the continuity of the video output stream from the RAM 204 to the RGB output register 208, and from the RGB output register 208 to the output three-channel DAC 209, from which the R, G, B signals are transmitted, transmitted through the RGB output connector to the computer monitor 3. All output blocks 207, 208, 209 operate at the PM2 clock frequency generated by the VGA synchronization controller 215 from the reference clock Thots OCH. The VGA synchronization controller 215 also generates horizontal (SINC_H) and vertical (SINC_V) VGA synchronization signals, which are supplied to the computer monitor 3 through the output buffer 216 (buffer amplifiers), which provides signal levels necessary for the operation of the TTL computer monitor.

The functional elements of the module of the converter 2 TV signal, outlined in figure 2 by dashed lines, that is, all except the ADC 201, DAC 209, RAM 204, input 213 and output 216 buffers and generator 206 reference frequency, are implemented on one programmable logic integrated circuit (FPGA). Each of the elements of RAM, ADC, DAC, buffers are implemented in separate microcircuits. As a result, the device becomes small.

Structurally, a device for displaying television video information on a computer monitor screen can be performed in three versions.

Firstly, in the form of a functional electronic module, presented structurally in figure 2 (without a computer monitor 3), which can be included in the equipment of the television system for monitoring objects or in the equipment of some other application. The functional elements of the module of the converter 2 TV signal, outlined in figure 2 by dashed lines, that is, all except the ADC 201, DAC 209, RAM 204, input 213 and output 216 buffers and generator 206 reference frequency, are implemented on one programmable logic integrated circuit (FPGA).

Secondly, in the form of an autonomous desktop monoblock and a monitor connected to it with the transducer located at any distance from the monitor, including using it as a monitor stand. In this embodiment, the functional module is supplemented by a secondary power source, FPGA boot circuitry, a push-button control panel and is structurally integrated with them.

Thirdly, in the form of a converter unit installed in a rack (cabinet) of the Euromechanics construct and connected to it by a monitor cable with removal to the required distance. According to the composition of the functional elements, the rack-mount version of the block is similar to the desktop monoblock.

The proposed device and method for displaying television video information allows you to realize the following advantages over methods and devices: minimum hardware volume, weight and power consumption, structural simplicity, which ensures the lowest cost of equipment, the possibility of maintenance (operation) by its unqualified personnel, high reliability of the equipment, including including in a wide range of climatic conditions, the invariance (universality) of the proposed method to various standards s television systems for objects.

Claims (2)

1. A device for displaying television video information on a computer monitor screen, characterized in that it contains a television signal converter, consisting of an analog-to-digital converter of the input video signal, the output of which is connected through the input FIFO (first-in, first-out) buffer to the input of the recording controller - reading video data, the input-output of which is connected to the input-output of synchronous dynamic RAM, the second input of the controller write-read video data is connected to the output of the multiplexer of addresses of write-read video data, and the third input is to the output of the reference frequency generator, the output of the video recording / reading controller through the FIFO output buffer is connected to the input of the RGB output register, the three outputs of which are connected to the corresponding inputs of the three-channel digital-to-analog converter, the outputs of which are connected to the signal input of the computer monitor , the first of the two inputs of the video write-read addresses multiplexer is connected to the output of the write address counter, and the second to the output of the read address counter, while the two inputs the recording records with the horizontal and frame synchronization signals are connected to the corresponding outputs of the video data selection controller, the third output of which is connected to the inputs of the analog-to-digital converter of the input video signal and the input FIFO buffer, respectively, two inputs of the read address counter are connected to two outputs of the VGA synchronization controller with horizontal signals and VGA frame synchronization, the third output of which is connected to the inputs of the output FIFO buffer, output RGB register and three-channel digital-to-analog converter respectively, and the fourth and fifth outputs are to the corresponding inputs of the output buffer of the computer monitor synchronization signals, two inputs of the video data selection controller are connected through the input buffer to the outputs of the television signal sensor by the synchronization signals of lines (SSI) and frames (CSI), and the third input of the selection controller video data is connected to the output of the reference frequency divider, the input of which is connected to the output of the reference frequency generator, the output of which is also connected to the input of the VGA synchronization controller and the input of the controller write-read video data. 2. A method of displaying television video information on a computer monitor screen, characterized in that the video signal received from the TV signal sensor is converted into digital form with a certain sampling clock rate, buffered to generate digital data packets necessary for recording the digitized video signal in synchronous dynamic RAM , and record in this way the digitized video signal line by line in synchronous dynamic RAM in the standard specified by the horizontal and frame synchronization signals The TV-signal sensor simultaneously simultaneously and independently reads from the synchronous dynamic RAM digital data of the video signal in another standard, which operates a computer monitor (VGA standard), in packets that are converted into a continuous stream of digital codes in the output FIFO buffer, and then - into digital color signals (RGB signals), the latter are converted in a digital-to-analog converter into analog RGB signals and fed to the signal input of a computer monitor, they form horizontal and vertical signals th VGA synchronization, which is used to control the reading mode of the video data recorded in synchronous dynamic RAM in the standard of computer monitor operation and for the computer monitor to work when the video information displayed by the TV signal sensor (TV system) is displayed on the screen.

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