RU2068625C1 - Device for tv monitoring - Google Patents

Abstract

FIELD: electric communications. SUBSTANCE: device has n sealed units each of which has TV camera, transmitter of TV signal, load commutator with TV signal antenna, load simulator, receiver of control commands, decoder of control commands, final-control unit, and control board, which has receiver of TV signals, selector of synchronization pulses, digital-to- analog converter, memory unit, memory controller, video controller, control unit, transmitter of control commands with antenna, monitor. Control unit receives TV picture from TV cameras, which are located in sealed units, in time-sharing mode, and transmits control commands to sealed units. Device may be used for transmitting pictures through radio channel by means of TV signals. Device is designed for remote monitoring object or area by means of set of TV cameras which send video signals through radio channels which operate at single frequency. EFFECT: increased functional capabilities, increased quality of received picture, decreased cost of system due to possibility to use radio channels which operate at single frequency. 2 cl, 2 dwg

Description

 The invention relates to communications, in particular, to video transmission by television signals (TS), and can be used for remote monitoring or control of an object or space (terrain, rooms, etc.) using a variety of television cameras, each of which is directed to a single object or piece of space.

 Existing television systems use radio frequency cables or radio channels based on radio stations of various types and classes to transmit video signals. However, in the implementation of such systems there are a number of technical difficulties associated with the temporary separation of video information from several cameras and sequential recording to a VCR or playback on a monitor screen.

 A television system is known in which television cameras have a common synchronization channel.

 The task of reproducing video information in this system is solved as follows. In the frame blanking sync pulse of the video signal from each camera, insets are made corresponding to the number of the camera, which is currently being recorded on the VCR. During the playback of the video image, the user indicates the camera number, and the device displays on the monitor screen only those image frames, insertions into the frame blanking pulse of which correspond to the camera number entered by the user. As a result, only the video image from the desired camera is displayed on the monitor screen, the video signals of the remaining cameras are skipped. This technical solution due to the need for a single synchronization channel for all television cameras significantly complicates the installation of the system and requires the use of television cameras with a special synchronization input, which is absent in most cameras.

 One of the close technical solutions to the claimed is a television system designed to monitor and control the object. This system contains a group of asynchronously operating television cameras connected by cable lines to a switching device, and consists of an analog-to-digital converter (ADC), a digital data storage device, a gate signal generating device, a switch, an encoding device.

 In this system, a television image from several cameras is fed to a switching device that connects the first camera and waits for the arrival of a frame sync pulse, when which the ADC starts converting the vehicle to digital form, storing it in the first digital data bank. Having finished digitizing the full frame, the switching device is connected to the second camera. At the time of the appearance of the frame clock, the ADC digitizes the television image from the second camera and stores it in the second digital data bank. At the same time, digital data with a television image from the first camera is fed to the DAC and then to the video output of the device, on which identifying information about the camera number is added to the video signal, and the full video signal is recorded on the VCR.

 This technical solution has the following disadvantages: the high complexity in the construction and installation works associated with the laying of radio frequency cables from television cameras to the control center; the impossibility of transferring television cameras to a more remote distance from the installation site of the video monitoring device without additional material costs associated with additional laying of radio frequency cables; the inability to install television cameras on moving objects; low quality of the image displayed on the video monitoring device due to the inability of the device to distinguish between the first and second interlaced half-frames.

 The closest technical solution to the claimed is the system described in US patent N 4326221.

 The aim of the invention is the creation of a television surveillance system using radio channels operating on the same frequency to transmit video images from television cameras remote at a considerable distance from the central station.

 The technical result from the implementation of such a system is to expand the functionality of the system, reduce the cost associated with the ability to work all the transmitters of the television signal in the system on one carrier frequency, to improve the quality of the image displayed on the monitor from television cameras, while the image can be displayed on the monitor screen from all television cameras at the same time.

 This is achieved by the fact that for video playback from television cameras installed to control and monitor a remote (5-10 km) object, radio channels are used that operate on the same frequency with time division.

 The set of nodes and connections implementing the system allows for television monitoring of the controlled object, transmitting video images from all cameras with time division on the same frequency channel. This is ensured by the fact that the load switch, in accordance with the command transmitted from the control unit, disconnects the TS transmitters that are not currently being polled from the antennas.

 The installation of television cameras in the airboxes gives the system additional functions due to the presence of an executive unit in the airbox, which allows: controlling the turntable on which the airbox is installed in two planes; control the lens zoom (zoom in, delete); focus the lens; turn on / off heating of the glass and the wiper of the hermetic box; turn on / off peripheral devices (spotlights, sirens, etc.).

 The video images received from the television camera from the control panel can be displayed on one or more monitors.

 The memory manager introduced into the system provides control of the digital information flows coming into (from) the RAM, and also generates a signal for generating control commands.

 The clock selector is used to extract horizontal and frame scan clock pulses from a full television signal, as well as to extract the clock pulses of the first interlaced half-frame.

 The control unit is designed to enter operator’s commands from the keyboard, generate control commands for television cameras and arrange the television frame on the monitor.

 In FIG. 1 shows a block diagram of a device; in FIG. 2 is a block diagram of a control unit.

 The television surveillance system (Fig. 1) contains 1, 2, n pressurized boxes with television cameras (n observation stations) and a central station 3.

 Herbboxes 1, 2, n contain respectively television cameras 4.1, 4.2, 4.n, the outputs of which are connected in series with transmitters TC 5.1, 5.2, 5.n, load switches 6.1, 6.2.6.n and load equivalents 7.1, 7.2, 7 .n. The germoboxes also contain receivers 8.1, 8.2.8.n of control commands, decoders 9.1, 9.2.9.n, the first outputs of which are connected to the inputs of the executive blocks 10.1, 10.2, 10.n, the second outputs with the inputs of the load switches 6.1, 6.2.6 .n.

 The central station 3 contains a TS receiver 13, a clock selector 14, an ADC 15, RAM 16, a memory manager 17, a video controller 18, a control unit 19, a transmitter 20 of control commands. The first output of the TS 13 receiver is connected to the input of the clock selector 14, the second output to the ADC input 15, the outputs of which are connected to the inputs of the memory manager 17, RAM 16 is connected by a bi-directional bus to the memory manager 17, which is also connected by a bi-directional bus to the control unit 19, the controller output memory 17 is connected to the input of the video controller 18, the output connected to the monitor 22.

 Antennas 21 of the vehicle and 23 control commands are connected respectively to the receiver of the vehicle 13 and the transmitter 20 of the control commands.

 The control unit 19 (Fig. 2) contains a microprocessor 24, ROM 25, a clock-timer 26, RAM 27, a keyboard 28, connected in parallel by a bi-directional bus, the output of which is connected to the memory manager 17.

 The proposed television surveillance system is implemented on 16 television cameras (n 1-16).

 However, an increase in the number of television cameras is possible, but it depends on the parameters of the element base (speed) on which the ADC, memory manager, video controller, and control unit are implemented, which affects the time it takes to change the image from the cameras on the monitor screen.

 The principle of the system is as follows.

 In the initial state, pressurized boxes 1, 2, n are installed on rotary platforms and placed at distances of 5-10 km from the central station to monitor the terrain. The transmitters 5.1, 5.2, 5.n of the television signal in the hermetic boxes are tuned to one frequency.

 The television image through the CCD matrices of television cameras 4.1, 4.2,4.n, is converted into standard television video signals with an amplitude of 1-1.5 V, supplied to the inputs of the transmitters TC 5.1, 5.2, 5.n. The outputs of the transmitters in the initial state through the load switches 6.1, 6.2, 6.n are connected to the equivalent load 7.1, 7.2.7.p. There is no radiation from the vehicle.

 The central station 3, installed at the control service post, after turning on the power source, sets the system to its initial state.

 The microprocessor 24 organizes the initial reset of the control unit 19, by which the starting address of the RAM 27 is set, the security of the service information recorded in the ROM 25 is checked, and through the video controller 18 it is displayed on the monitor screen 22. At the same time, the control unit 19 prevents the memory manager 17 from writing to the RAM 16 and output information from it to the video controller 18.

 The receiver 13, the clock selector 14 and the ADC 15 are in a state of waiting for the signal of the television image from the television cameras 4.1, 4.2, 4.p

 The information displayed on the screen of the monitor 22 from the ROM 25 contains a user menu, according to which the operator must indicate: the number of monitors on which television images will be displayed; the number of television cameras from which video images will be displayed on the screen of one monitor; date, month, year and time the system started to work; physical numbers of pressure boxes operating in the system.

 After entering the required information, the operator puts the system in automatic mode.

 The control unit 19, having received a command from the operator to switch to automatic mode, selects the physical number of the hermetic box in RAM 27 (for example 1) and generates a control command that contains: the physical number of the hermetic box from which the full frame of the television image will be received (for example 1 ); command to the load switch 6.1 to connect the vehicle 5.1 transmitter to the vehicle antenna 11.1; command executive unit 10.1 (if necessary) to control peripheral devices.

 Having formed the command, the microprocessor 24 by a serial code feeds it to the input of the transmitter of control commands 20, which through the antenna of control commands 25 emits it on the air.

 Hermoboxes 1, 2, n receive command from the central station through antennas 12.1, 12.2, 12.n of control commands, which is fed to the inputs of receivers 8.1, 8.2, 8.n of control commands and then to the inputs of decoders 9.1, 9.2, 9.n of commands controls that allocate from the team the physical number of the germobox to which the team is facing.

 If the physical number of the hermetic box matches the accepted number (for example 1), the decoder 9.1 of the control commands of the first hermetic box sends a signal to the load switch 6.1 to connect the TC 5.1 transmitter to the antenna of the TC 11.1, and the video signal from the television camera 4.1 is broadcast.

 At the central station 3, the signal received by the receiver 13 is fed to the input of the clock selector 14 and the input of the ADC 15, which converts the analog signal to digital. The recording of images in digital form in RAM 16 is prohibited by the memory manager. The sync selector 14, analyzing the video image, is waiting for the arrival of the frame sync pulse of the first half-frame interlaced. At the time of the arrival of the frame clock, the clock selector 14 provides a signal to the memory manager to enable the recording of digital information in RAM 16.

 The memory manager 17 starts recording in RAM 16 video information in digital form from the hermetic box 1, starting with the address assigned to this hermobox.

 In the intervals between the recording operations in the RAM 16 of the video information in digital form, the memory manager 17 outputs the video information to the video controller and then to the monitor in the format specified by the operator during the initial installation of the system. The memory manager 17 simultaneously with the recording in RAM 16 of the video signal counts the lines of the television signal. At the moment the last line of the second half-frame of interlaced scan arrives, the memory manager 17 stops writing digital video information from the television camera 4.1 to the RAM 16 and gives the end signal to the microprocessor.

 The microprocessor 24 selects from the RAM 27 the next physical number of the germobox, (for example 2), and begins to form a control command, which is transmitted through the transmitter 20 control commands. Further, the operation of the system with hermobox 2 is similar to the work with hermobox 1.

 The executive unit, introduced into the hermetic box, is a series of transistor keys connected in parallel to the input of the decoder control commands, the outputs of the transistor keys are connected to actuators, each of which performs a specific function.

 If it became necessary to simultaneously control the executive unit at the same time as receiving the television image (for example, to control the turntable left, right, up, down), then when the microprocessor 24 generates a control command to connect the required television camera, information is transmitted to the executive unit to perform the necessary functions. Upon receipt of such a command, the decoder of the control commands connects the required actuator via a transistor switch.

 Simultaneously with the output of video information to the monitor screen, the microprocessor, by second interruptions from the timer clock, reads the current time, date, month and year and places them on the monitor screen.

 The advantages of the proposed system are that it reduces material costs by saving the frequency resource, allows all transmitters to work on the same frequency, can be installed on moving objects and in inaccessible places, improves the quality of the television image displayed on the monitor screen by highlighting the first and the second half-frame interlaced.

Claims (2)

 1. A television surveillance system containing n monitoring stations, each of which has a television camera, the output of which is connected to the input of the television signal transmitter, serially connected control command receiver, control command decoder, executive unit, control command receiver input connected to the output of the receiving antenna control commands, a transmitting antenna of a television signal, a central station including a clock selector, a receiving antenna of a television signal, a cat output swarm is connected to the input of the television signal receiver, the first output of which is connected to the input of the clock selector, a control command transmitter, the output of which is connected to the input of the control command transmitting antenna, a monitor, characterized in that a load switch and a load equivalent are connected in series to each observation station, the first input of the load switch is connected to the output of the television signal transmitter tuned to the same frequency as the television signal transmitters each x stations operating with time division, a second input with a second output of a control command decoder, a second output of a load switch with a transmitting antenna for a television signal, a television camera, a television signal transmitter, a load switch, a load equivalent, an executive unit, a control command decoder, a receiver control commands are placed in a pressurized box, a memory manager, an analog-to-digital converter, random access memory, a video controller, a unit are introduced at the central station control, while the second output of the television signal receiver is connected to the input of the analog-to-digital converter, the outputs of the clock selector and the analog-to-digital converter are connected to the inputs of the memory manager, the RAM and the control unit are connected by bi-directional buses to the memory manager, the output of the memory manager and the first output the control unit is connected respectively to the first and second inputs of the video controller, the output of which is connected to the input of the monitor, the second output of the control unit The phenomena are connected to the transmitter of control commands.  2. A television surveillance system according to claim 1, characterized in that the control unit comprises a microprocessor, a second random access memory, read-only memory, a keyboard, a timer clock, connected in parallel by a bi-directional bus connected to the memory manager, the microprocessor outputs are outputs control unit and connected to the input of the video controller and the input of the transmitter of control commands, and the microprocessor organizes the initial reset of the control unit, which sets I am the starting address of the storage device, checks the safety of the information recorded in the read-only memory device.

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