KR100227413B1 - Multiple transmitting/receiving apparatus of a closed circuit television - Google Patents

Abstract

The present invention relates to a multiplex transmission and reception apparatus of a closed circuit television (CCTV), comprising: a plurality of surveillance cameras CA1 to CAn for photographing a subject and outputting a video signal; A number of control devices (Rx1 to Rxn) corresponding to each monitoring camera for adjusting the up, down, left, right, right, left, and right of the subject, and the perspective of the distance of each surveillance camera; By connecting the surveillance camera and the control device at the same time, the video signal of the surveillance camera is transmitted, and the number of multiple transceivers MR1 to MRn corresponding to each surveillance camera for applying a control signal to the control device; One coaxial cable connecting the multiple transceivers MR1 to MRn in series; It is connected to the manipulator 4 which is connected to said one coaxial cable and outputs the said control signal, and the power supply 5 which supplies power to the said multiple transceiver and a control apparatus, and from the said multiple transceiver via the said coaxial cable. A multiple transmission / reception center (MT) for receiving a transmitted video signal and transmitting control signals and power input from the manipulator 5 and the power supply 5 to the multiple transceiver; In addition, a monitor 1 for receiving a video signal from the multiplexing transmission / reception center MT and displaying the video signal is provided, and the video signal and the control signal using one coaxial cable regardless of the number of surveillance cameras. It is devised to transmit power.

Description

Multiple transceivers in closed circuit television.

The present invention relates to video signal transmission, control signal transmission, and power supply of a closed circuit television (CCTV), and a closed circuit for simultaneously transmitting or supplying a plurality of video signals, control signals, power and the like with one strand of coaxial cable. Multiple transmitting and receiving device for closed circuit television.

In general, a control signal for controlling the video signal transmitted from the surveillance camera to the monitor in a closed circuit television, the up and down and left and right rotation of the camera and the enlargement and reduction of the subject, the perspective adjustment of the distance, and the on / off of various power supplies; Power supply was transmitted and received through each video signal transmission line, control signal transmission line, and power supply line.

Each of the video signal lines, the control signal lines, and the power supply lines are separately provided, or the control signal lines and the power supply lines are laid in the same wire, but the video signal lines are separately laid.

1 is a block diagram showing a transmission and reception apparatus of a conventional closed circuit television.

As shown in FIG. 1, a plurality of surveillance cameras CA1 to CAn for capturing a subject and outputting an image signal are transmitted to the monitor 1 for transmission by the video signals input from the surveillance cameras CA1 to CAn. By applying a predetermined output to the image control central unit 2 and the image control central unit 2, the control devices Rx1 to Rxn located under the surveillance cameras CA1 to CAn are operated to operate the control unit Rx1 to Rxn. And a manipulator 4 for outputting a control signal for adjusting rotation and enlargement / decrease of the subject, circle / root of distance adjustment, on / off of various power sources, and the like.

The control signal output from the manipulator 4 is applied to the control devices Rx1 to Rxn for adjusting the camera via the image control central unit 2. At this time, the power supply 5 is connected to the cable for transmitting the control signal, so that the control signal cable and the power cable are included.

That is, the power and control signals are transmitted in one cable as described above, but the video signal cables are connected to the image control central unit through separate cables.

However, such a multiplexing and receiving device has a problem in that the number of video signal lines corresponding to each surveillance camera must be installed, and the number of control signal lines corresponding to each control device must be installed.

In order to solve such a problem, as shown in FIG. 2, the patent application No. 96-2481, which is filed by the present applicant, has multiple cameras through the video cables ECX1 to ECXN to the respective monitoring cameras CA1 to CAn. The camera multiplexer 30 which connects the transmitters 20 to 2N and receives the final output of the camera multiplexers 20 to 2N through a single video cable ECX and outputs the corresponding video output to the control device 10. ).

However, although the multiplexed transmission / reception apparatus of the closed circuit television shown in Fig. 2 can transmit the video signal of the surveillance camera to the monitor as a single video signal cable regardless of the number of the surveillance cameras, the control signal and Control signals and power lines for supplying power have had to be installed separately. Due to such a problem, the area occupied by the control signal line and the power line is increased, which increases the difficulty of the cable installation place, the material cost, the labor cost, and the like, thereby making maintenance and management difficult. .

Because of these problems, there is a problem in that it is not economical to newly install, expand, or relocate closed-circuit televisions, and a considerable construction cost is required for long distance (by several Km) construction.

Accordingly, the present invention was devised to solve the above problems, and an object of the present invention is to provide a video signal, a control signal, and an operating power source for a closed circuit television (CCTV) system regardless of the number of surveillance cameras. The present invention provides a multiple circuit transceiver of a closed circuit television that can transmit a video signal, a control signal, a power supply, or the like using a stranded coaxial cable.

1 is a block diagram showing a multiple transceiver of a conventional closed circuit television.

Fig. 2 is a block diagram showing another conventional multiplexed transceiver of a closed circuit television (Patent No. 96-2481).

Figure 3 is a block diagram showing a multiple transceiver of a closed circuit television according to the present invention.

4 is a block diagram illustrating multiple transceivers in accordance with the present invention.

5 is a block diagram illustrating a multiplexing transmitter and receiver according to the present invention.

<Explanation of symbols for the main parts of the drawings>

CA1-CAn: surveillance camera MR1-MRn: multiple transceiver

Rx1 to Rxn: Control unit MT: Multiple transmit / receive central unit

1: Monitor 2: Video Control Central

4: manipulator 5: power supply

102: first amplifier 104: first mixer

106: first filter 108: first oscillator

110: second amplifier 112: second filter

114: first reverse coupler 116: second mixer

118: third amplifier 120: third filter

130: forward combiner 202: first band filter

204: data amplifier 206: second band filter

208 RF demodulator 210 decoder

300: third band filter 302: second reverse coupler

304: fourth high frequency amplifier 306: high frequency distributor

308: fourth filter 310: third mixer

312: second oscillator 314: video amplifier

400: encoder 402: RF modulator

404: fourth band filter

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 to 5 show an embodiment of the present invention, Figure 3 is a block diagram showing a multiple transceiver of a closed circuit television according to the present invention, Figure 4 is a multiple transceiver according to the present invention 5 is a block diagram illustrating a multiple transceiver center according to the present invention.

As shown in FIG. 3, the present invention provides a control apparatus Rx1 for adjusting the position and rotation of surveillance cameras CA1 to CAn for capturing a subject and outputting a predetermined video signal, and the surveillance cameras CA1 to CAn. ˜Rxn, multiple transceivers MR1 to MRn for parallel connection of the control devices Rx1 to Rxn and the surveillance cameras CA1 to CAn, and one multiple transceiver of the multiple transceivers MR1 to MRn connected in series with each other. (MR1 to MRn) and a single coaxial cable connected to the control unit (4) and the power supply (5) and the multiplex transmission and reception center (MT), the multiple transmission and reception center (MT) connected to the monitor (1) Is done.

That is, the multiple transceivers MR1 to MRn transmit video signals output from the surveillance cameras CA1 to CAn, while the top and bottom left and right rotations of the surveillance cameras CA1 to CAn, enlargement and reduction of the subject, and distance Control signals and power supplies for controlling perspective adjustment and various power on / off are received and transmitted to the control devices Rx1 to Rxn.

On the other hand, the multiple transceiver center MT is connected to one of the multiple transceivers MR1 to MRn by a single coaxial cable, and is also connected in parallel with the manipulator 4 and the power supply 5 to monitor. Video signals output from the cameras CA1 to CAn are received and transmitted to the monitor 1, and control signals output from the manipulator 4 and the power supply 5 (e.g., monitoring cameras CA1 to CAn). Up, down, left, and right rotation, zooming in and out of the subject, adjusting the distance and turning on and off various power supplies) and power are transmitted to the multiple transceivers MR1 to MRn.

Thus, the monitor 1 receives the video signal through the monitoring cameras CA1 to CAn, the multiple transceivers MR1 to MRn, one coaxial cable, the multiplexing transmitter / receiver MT, and the monitor 1 in order. The video signals of the surveillance cameras CA1 to CAn are displayed, and the camera controllers Rx1 to Rxn and the power supply are operated by the manipulator 4, the power supply 5, the multiplexing transmission / reception center (MT), and one strand of coaxial cable. The control signal and the power are received through the multiple transceivers MR1 to MRn, the control devices Rx1 to Rxn, and a power source.

In addition, using this method, the signal cable separated from the multiple transceiver (MR1 ~ MRn) is focused on the compatibility with the existing device to avoid the problem of having to purchase or replace the equipment separately.

Control signals and power supplies separated from the multiple transceivers MR1 to MRn are supplied to the control apparatus Rx1 to Rxn or the monitoring cameras CA1 to CAn using existing cable standards, and even when the cable is newly installed or replaced. Do not receive.

The configuration of the multiple transceivers MR1 to MRn in the above configuration will now be described with reference to FIG.

As shown in Fig. 4, the multiple transceivers MR1 to MRn are connected in parallel with control signals Rx1 to Rxn for controlling the position of the video signal output lines of the monitoring cameras CA1 to CAn and the positions of the monitoring cameras CA1 to CAn. It is connected. The first amplifier 102 amplifies the video signal to an appropriate value by receiving the video signals of the surveillance cameras CA1 to CAn. The first mixer 104 mixing the image signal amplified by the first amplifier 102 and the oscillation signal output from the first oscillator 108 modulates the mixed signal into an RF signal. The first filter 106 receiving the RF signal modulated by the first mixer 104 filters and outputs only a predetermined frequency band, and outputs the RF output output through the first filter 106 to the second amplifier. 110 amplifies. The second filter 112, which receives the RF amplified output amplified by the second amplifier 110, filters the RF amplified output only a certain frequency band again. In addition, the second mixer 116 receiving the RF amplified output filtered by the second filter 112 is sent from the multiple transceivers MR1 to MRn ₋₁ connected in series with the multiple transceivers MRn. It is mixed with RF signal input of other frequency band.

The third amplifier 118 that receives the mixed RF signal output from the second mixer 116 amplifies the mixed RF signal output to an appropriate value again, and outputs the RF output from the third amplifier 118. The third filter 120 passes the signal output only through a predetermined frequency band.

In addition, the forward combiner 130 receiving the RF signal filtered by the third filter 120 may output the RF signal and the image signal output from the multiple transceivers MR1 to MRn ₋₁ and the multiplexing transmission / reception center MT. ) To separate control signal and power.

The first band filter 202 receiving the control signal value separated and extracted from the forward combiner 130 filters out only the predetermined band so that it can be used and prevents other signals from passing through.

The data amplifier 204 which receives the control signal filtered by the first band filter 202 amplifies the Jaar signal, and the amplified data signal is RS-485, which is the original control signal by the RF demodulator 208, RS-422, Current Loop Signal, etc. will be restored to the original signal. The decoder 210 analyzes the control signal output from the RF demodulator 208 and sends a signal to each camera control device Rx1 to Rxn. The control device Rx1 to Rxn receives the signal and monitors the camera. The position, rotation, and the like of CA1 to CAn are controlled.

In addition, the second band filter 206, which receives the control signal amplified by the data amplifier 204, passes only a signal of another control device Rx1 to Rxn- ₁ , and the second band filter 206. The first reverse coupler 114, which receives the control signal of the multiple transceivers MR1 to MRn- ₁ passing through the other end, recombines the video signal, the control signal and the power source, and receives another multiple transceivers MR1 to MRn- _1. ) Is applied.

In this way, the plurality of video signals, control signals, and power supplies that are combined in the respective frequency bands in the loop are connected to the control signals, video signals, and power supplies for the respective cameras and the control devices Rx1 to Rxn- ₁ . ) And are extracted from the band pass filter and transmitted to the control devices Rx1 to Rxn- ₁ and the power supply.

In addition, the operating power of the multiple transceivers MR1 to MRn is separated and extracted from the forward coupler 130.

In addition, the structure of a multiplexing transmission / reception center (MT) that receives an image signal and transmits a control signal and a power source is as follows.

As shown in FIG. 5, the multiplexing transmission / reception center MT extracts a video signal from a signal transmitted from the multiplexing transceivers MR1 to MRn in each region, and needs multiple transceivers MR1 to MRn in each region. It supplies power, and also transmits a control signal provided from a separate manipulator 4 to the multiple transceivers MR1 to MRn in each region.

That is, the multiple transmit / receive central unit MT has a power supply 5 for applying AC power to a coaxial cable, and the third band filter 300 connected to the power supply 5 has the AC power flowing into the main circuit. Prevent it. The second reverse coupler 302 that receives the image signal passed through the third band filter 300 combines the image signal and the control signal having different directionality. The fourth high frequency amplifier 304, which receives the RF signal passed through the second reverse coupler 302, amplifies the RF signal appropriately. The high frequency divider 306 classifies the image RF signal passing through the fourth high frequency amplifier 304 for each channel. The signal distributed for each channel is filtered so that a signal of another channel does not flow in the fourth filter 308 to some extent, and makes a specific period to demodulate the original signal and the signal that passed through the fourth filter 308. The main demodulator 310 synthesizes and demodulates the signal output from the second oscillator 312. The original video signal completely demodulated by the third mixer 310 is amplified and supplied to the monitor 1 so that the video amplifier 314 can observe a clear image.

In addition, the encoder 400 receiving the value of the control signal output from the manipulator 4 added separately, the RF modulator for encoding the value of the control signal, and receives the control signal sent by encoding from the encoder 400 Reference numeral 402 converts the control signal into an RF signal.

The fourth band filter 404, which receives the RF signal output from the RF modulator 402, prevents other signals that may be introduced from the second reverse coupler 302 from flowing to the RF modulator 402. The RF signal passing through the fourth band filter 404 is combined with other signals in the reverse combiner and transmitted to other multiple transceivers MR1 to MRn.

As described above, the multiple-circuit transmission / reception apparatus of a closed-circuit television according to the present invention is a single strand of a single strand regardless of the number of surveillance cameras for multiple transmissions such as video signals, control signals, and operating power of a closed-circuit television (CCTV) system. Video signal, control signal, power, etc. can be transmitted using coaxial cable, and in order to install multiple surveillance cameras and multiple transceivers, one coaxial cable can transmit video signal, control signal, power, etc. The convenience of the shops and the area occupied by the cable are reduced, so that the construction can be performed without being restricted by the factory.

Claims (3)

Multiple transmission / reception of a closed-circuit television which transmits a video signal of the monitoring cameras CA1 to CAn to the monitor 1, and transmits a control signal and power to control the position and perspective of the monitoring cameras CA1 to CAn. In the apparatus, A plurality of surveillance cameras CA1 to CAn for photographing a subject and outputting a video signal; Number of control devices (Rx1 to Rxn) corresponding to each of the monitoring cameras CA1 to CAn for adjusting the up, down, left and right rotation of the monitoring cameras CA1 to CAn, enlargement and reduction of the subject, and perspective of the distance; By connecting the monitoring cameras CA1 to CAn and the control devices Rx1 to Rxn at the same time, the video signals of the monitoring cameras CA1 to CAn are transmitted and each monitoring device for applying a control signal to the control device. Multiple transceivers MR1 to MRn corresponding to cameras CA1 to CAn; One coaxial cable connecting the multiple transceivers MR1 to MRn in series; Connected to the single coaxial cable and connected to a manipulator 4 for outputting the control signal and a power supply 5 for supplying power to the multiple transceivers MR1 to MRn and the control devices Rx1 to Rxn. The image signal transmitted from the multiple transceivers MR1 to MRn through the coaxial cable is received, and the control signal and the power input from the manipulator 5 and the power supply 5 are the multiple transceivers MR1 to MRn. A multiple transmit / receive center (MT) for transmitting to the network; And, And a monitor (1) for receiving a video signal from the multiplexing transmission / reception center (MT) and displaying the video signal. The method of claim 1, wherein the multiple transceivers (MR1 to MRn), A first amplifier 102 which receives a video input from the monitoring cameras CA1 to CAn and amplifies the video input to an appropriate value; A first mixer 104 for mixing and modulating the image signal amplified by the first amplifier 102 and the oscillation signal output from the first oscillator 108, A first filter 106 which cleans only a predetermined frequency band of the RF signal modulated by the first mixer 104, A second amplifier 110 for amplifying the RF signal passed through the first filter 106, A second filter 112 for filtering the RF amplified signal passed through the second amplifier 110 again only a predetermined frequency band; A second mixer 116 in which the RF amplified signal passed through the second filter 112 and RF signals of different frequency bands transmitted from another multiple transceiver are mixed; A third amplifier for amplifying the RF signal output through the second mixer 116 again to an appropriate value; A third filter 120 for filtering only a predetermined frequency band of the RF amplified signal output from the third amplifier 118 again; Forward combiner 130 that separates the video signal mixed with another multiple transceiver (MR1 ~ MRn) passed through the third filter 120 and the control signal, power, etc. transmitted from the rear end or multiplex transmission and reception (MT) , A first band filter 202 for filtering only a predetermined band of the control signal value separated from the forward combiner 130 or preventing other signals from passing through; A data amplifier 204 for amplifying the control signal passed through the first band filter 202, RF demodulator 208 for recovering the control signal amplified by the data amplifier 204 from the RF value to the original control signal (for example, RS-485, RS-422, Current Loop Signal, etc.), A decoder 210 for analyzing a control signal output from the RF demodulator 208 and applying a signal to the control devices Rx1 to Rxn; A second band filter 206 for passing only a control signal of a frequency band to other control devices Rx1 to Rxn among the control signals passed through the data amplifier 204, and A first reverse coupler 114 for coupling an RF signal applied from the second band filter 206 and the multiple transceivers MR1 to MRn at the other end is provided, and an image signal applied from the surveillance cameras CA1 to CAn. The multi-transmitter and receiver of a closed-circuit television, characterized in that for transmitting to the multi-transmission and reception center (MT), and receives the control signal and power applied from the multi-transmitter. According to claim 1, The multiple transmit and receive central station (MT), A power supply (5) for applying AC power to the coaxial cable, A third band filter 300 to prevent the AC power from flowing into the main circuit; A second reverse combiner 302 which combines the video signal passed through the third band pass filter 300 with a control signal having a different direction; A fourth high frequency amplifier 304 suitable for amplifying the RF signal passing through the second reverse coupler 302, A high frequency divider 306 for classifying the RF signal passing through the fourth high frequency amplifier 304 for each channel, A third filter 120 for filtering the signal distributed by the high frequency divider 306 so that a signal of another channel does not flow to some extent; A third mixer 310 for synthesizing the signal passing through the third filter 120 and the third oscillator for creating a specific period to demodulate the image signal passed through the third filter 120 into the original signal; A video amplifier 314 for displaying an image on the monitor 1 by amplifying the original image signal completely demodulated by the third mixer 310 so that a clean image can be observed; An encoder 400 for encoding a value of a control signal output from the manipulator 4 for operating the surveillance cameras CA1 to CAn, An RF modulator 402 for converting a control signal encoded by the encoder 400 into an RF signal, Sending the signal output from the RF modulator 402 to the second reverse coupler 302 and at the same time block other signals that may be introduced from the second reverse coupler 302 to flow to the RF modulator 402. A fourth band filter 404 is provided to receive the video signals from the multiple transceivers MR1 to MRn and transmit them to the monitor 1, and control signals and power are received from the manipulator 4 and the power supply 5. And transmitting to the plurality of multiple transceivers (MR1 to MRn).

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