KR101360992B1 - Long-distance transmission apparatus of high quality digital(hd type video) image signal - Google Patents

Abstract

The present invention relates to a long distance transmission device for a digital HD image signal. When the digital HD image signal is transmitted, a digital signal is converted into a signal to be loaded on a UTP cable and then is amplified. The amplified signal is transmitted through the UTP cable. The optimum HD signal modified in FPGA is transmitted to a digital DVR as the digital signal and is reproduced to be displayed on a monitor. [Reference numerals] (400) Security element unit; (410) Security element execution unit; (420) Command processing unit; (500) Opened type operating environment part; (600) Concealed type operating environment part; (610) Security service request management unit; (620) Security service execution unit; (630) Session management unit; (640) Security element management unit; (650) Command transmission unit; (700) Hypervisor; (AA) Application program; (BB) Security service requesting unit

Description

Long-distance transmission device for digital high-definition video signal {LONG-DISTANCE TRANSMISSION APPARATUS OF HIGH QUALITY DIGITAL (HD TYPE VIDEO) IMAGE SIGNAL}

The present invention relates to a long-distance transmission device for digital high-definition video signal, and in particular, digital high-definition video signal cannot be transmitted through a UTP cable. When the digital signal is converted into a signal (analog signal, etc.) that can be carried on the UTP cable, and amplified it, and then transmitted to the 2 ~ 3Km through the Ushipi (Unshieled Twisted Pair: UTP) cable, the UTP cable After receiving and amplifying the transmitted signal, the received signal is converted into a digital high-definition (HD-level) video signal, and the signal is changed to its original state in the FPGA, so that it can be viewed on a monitor while playing on a digital DVR. High-definition video) Digital high-definition (HD video) video signal long-distance transmission device that can transmit video signals up to 2 ~ 3km .

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Generally, transmission and reception of captured video signals, such as a camera of a surveillance system, use a coaxial cable.

That is, after transmitting the captured image of the camera to the receiver installed in the monitoring station by using a coaxial cable, the receiver recovers the signal and outputs it to an image output device such as a monitor.

The coaxial cable for transmitting and receiving image signals photographed by the camera as described above has a straight line structure without twisting by performing external noise shielding using ground.

Unbalanced transmission was performed based on the common ground potential, and the inflow of noise was prevented by transmitting using a shielding film.

Such a coaxial cable has an advantage of cost competitiveness in a small-scale application, but in a large-scale site, since the 1: 1 transmission method increases the material cost of the cable, and the construction efficiency decreases due to an increase in piping wiring trays. Deterioration of image quality over distance is increased, so even if an amplifier is additionally installed, a long distance transmission over a certain distance is impossible.

Thus, the transmission and reception of captured video signals, such as cameras of surveillance systems, were to use a common UTIP cable.

That is, after transmitting the captured image of the camera to the receiver installed in the monitoring station using the UTIP cable to restore the signal from the receiver to output to an image output device such as a monitor.

In the case of the UTP cable, there is no shielding structure, but it has a twisted structure, and a signal is transmitted by a balanced transmission method using phase inversion, and noise is blocked by a balanced transmission method of a twisted structure.

Such a UTP cable has a feature to remove noise by a twisted structure, but it is impossible to completely remove the noise, and when a transmission line exceeds 100m, an amplifier must be added every 100m.

In addition, in the case of the image transmission by the coaxial cable and the UTP cable of the prior art described above, it is not possible to supply power to be input to an external device such as a camera by a coaxial cable or a UTP cable, so that a separate power supply device is provided. I have a problem.

Moreover, due to the remarkable development of computer and information communication technology, the modern society has been developed not only to transmit and receive text data but also to send and receive large-capacity multimedia files such as voice and video through remote internet.

Based on the technology related to the multimedia transmission, a voice call technology through the Internet network has been developed, and furthermore, a video call or video chat service capable of making a call or chatting while watching a face image captured by a video camera is provided.

On the other hand, according to the above video call or video chat service, the other person's face or object can be checked in real time, but the range of the video camera can be taken within a few tens to hundreds of centimeters from the computer. There was a problem that can not provide a remote image.

In order to capture the site image outside the building, after moving to the site and shooting a video with a digital camcorder, the file stored in the camcorder must be transferred to a streaming server by transferring it to a computer through a cable, so there is a time difference between streaming after shooting. There was a problem that can not be broadcast live in real time.

For this reason, the patent application No. 10-2007-0094038 dated September 17, 2007 (simultaneous transmission / reception apparatus for power and video signals using a UTP cable) has been proposed.

Looking at the patent application No. 10-2007-0094038,

In the transceiver having a transmitter and a receiver for transmitting and receiving the video signal and power of the camera via a UTIP cable,

The UTP cable is composed of 1 pair (pair),

The transmitter includes a modulator for receiving a video signal of the camera and modulating the video signal to a specific frequency;

A transmission side differential amplifier which differentially amplifies the output video signal of the modulator;

And a transmission side power supply unit receiving DC power from the receiver and outputting the DC power to the camera.

The one-pair utility cable is connected to an output terminal of the transmitting side differential amplifier through a pair of capacitors and commonly connected to an input terminal of the transmitting side power supply through a pair of inductors.

The receiver includes:

A receiving side differential amplifier which differentially amplifies the video signal received from the transmitter;

A demodulator for demodulating the output video signal of the receiving side differential amplifier into an original video signal;

A video signal amplifier for amplifying the output video signal of the demodulator;

An image output unit which outputs an output image signal of the image signal amplifier to an image output device;

Receiving side power supply unit for supplying DC power to the transmitter;

The one-pair UTP cable is configured to be connected to the input terminal of the receiving side differential amplification unit through a pair of capacitors and to be commonly connected to the receiving side power supply unit.

In addition, Patent Application No. 10-2005-0070222 dated August 01, 2005 (A method and system for real-time multimedia streaming using 1394ｂ-ＵＴＰ5) was proposed.

This is a real-time multimedia streaming system that streams multimedia data captured by a digital camcorder to a user terminal in real time.

A digital camcorder that photographs an object and generates multimedia data in digital form in real time;

At least one 1394a-1394b bridge for converting 1394a standard multimedia data transmitted from the digital camcorder through a UTP5 cable (Unshielded Twisted Pair Cable cat. 5) to 1394b standard;

A 1394b-UTP5 switching hub that aggregates one or more UTP5 cables connected to the 1394a-1394b bridge and receives 1394b standard multimedia data from the 1394a-1394b bridge; And

Real-time multimedia streaming to receive the multimedia data from the 1394b-UTP5 switching hub in real time via a UTP5 cable and to stream the corresponding multimedia data to the user terminal in real time when a specific channel or a specific URL is selected from the user terminal through an information communication network. server;

It was configured to include.

However, in the conventional video signal transmission and reception apparatus using the UTIP cable as described above, the signal system for transmitting the video signal from the camera to the monitor and the storage device transmits the video signal using the 'NTSC' standard method, and the NTSC signal. In the interlaced scanning method, a single screen is composed of 525 horizontal signal lines, which transmit 30 still images per second to realize a moving image. Therefore, there is a limitation in transmitting high resolution images due to signal characteristics.

In other words, it was not possible to transmit HD video over a UTP cable.

Thus, it is a method used to transmit high resolution (HD level video) video and transmits video signal through network using standard compression method such as 'MPEG-4', 'H.264' etc. Although a method has been proposed, a video transmission method using a network can transmit high resolution, but there are many inconveniences for users and installers.

That is, since Plug and Play (PnP) is not provided, there is a problem in that it is possible to use the IP setting, PORT setting, and other settings of the encoder by using a separate setting program and management program for each manufacturer.

In addition, the standard compression method is used for each manufacturer, but the internal programs for implementing images are different from each other, so that the programs are not compatible with each other.

The IP method (compression) using UTP cable can transmit HD-quality video over a long distance, but video has a drawback phenomenon or a traffic problem.

And although some HD-SDI transmission methods are used, when the transmission distance is coaxial cable, the transmission distance is only 140 ~ 200m. Therefore, various methods for extending the transmission distance should be used.

Here, HD-SDI (High Definition Serial Digital Interface) refers to the digital video transmission standard, which is advantageous when implementing high resolution video of at least 720p (1280 x 720) and currently supports HD-SDI format in HD cameras and broadcasting equipment for HD digital broadcasting. I use it.

Since each format for transmission of the digital high definition image (HD-SDI) signal has a large amount of data to be transmitted per second, it is required to use a high frequency of several hundred MHz to 1 GHz or more in comparison with an analog video format using less than 10 MHz The difference is more than 100 times.

The larger the frequency, the shorter the wavelength, so the signal attenuation occurs more quickly, and the most important point is to minimize the signal attenuation.

Therefore, a 75 ohm coaxial cable should be used to transmit a digital high-definition video (HD-SDI) signal, and there is a problem in that the signal attenuation occurs due to the frequency-dependent refinement wave voltage ratio (VSWR) when a general BNC plug is used.

Therefore, HD video can be transmitted through coaxial cable, but only up to 200m can be transmitted. Therefore, a repeater should be installed every 200m for long distance transmission of HD video over 2 ~ 3km through coaxial cable. there was.

That is, as shown in Fig. 1,

In order to output the HD-quality video signal captured by the HD camera 101 to the repeater 103 via the coaxial cable 102 and transmit it to the receiving unit 110, each of the coaxial cables 104, 106 and 109 is transmitted. The first repeater 105, the second repeater 107, and the n-th repeater 108 should be installed at intervals of 200 m.

Therefore, there are inefficient disadvantages such as difficulty in installing a repeater and increasing installation cost.

Accordingly, the present invention is to solve the above-mentioned problems, the digital high-definition (HD-class) video signal can not be transmitted through the UTP cable, so when transmitting digital high-definition (HD-class) video signal digital signal UTP After converting to a signal (analog signal, etc.) that can be carried on the cable, and amplifying it, it is transmitted to the 2 ~ 3Km through the Ushipi (Unshieled Twisted Pair: UTP) cable, the signal transmitted through the UTP cable After receiving and amplifying the signal, convert the received signal into a digital high-definition video signal and modify the signal in the original state in the FPGA so that it can be viewed on a monitor while playing on a digital DVR. Its purpose is to provide a digital high-definition (HD-class video) long-distance transmission device that can transmit signals up to 2 ~ 3km. do.

Digital high-definition (HD class video) video signal long distance transmission device of the present invention for achieving the above object,

Output digital high-definition video signal, power and data from HD camera through coaxial cable.

Amplifying while converting the high-definition video signal and power and data from the HD-class camera to a parallel signal (B / T signal) of 10bit to 20bit in the first repeater of the transmission unit (TX),

In the D / A converter receiving the converted parallel signal, a digital signal of an image signal and data is converted into an analog signal,

The high-definition video signal and data converted into analog signals through the D / A converter are amplified to compensate for signal attenuation occurring during transmission in the first differential amplifier, and then transmitted up to 2 to 3 km long distance through the UTP cable. ,

In the second differential amplifier of the receiver RX receiving the high definition video signal and the data of the analog signal transmitted through the UTP cable, the high quality video signal and the data are amplified to compensate for the signal attenuation generated during transmission.

In the A / D converter receiving the high-definition video signal and data of the analog signal amplified by the second differential amplifier to convert the analog signal into a digital signal,

Amplifying while converting the digital signal to a parallel signal (B / T signal) of 10bit ~ 20bit in the second repeater receiving,

The high quality of the digital signal in a field programmable gate array (FPGA), which is a semiconductor device including a programmable logic element that receives a digital signal of a parallel signal (B / T signal) of 10 to 20 bits in the second repeater and a programmable internal line. To correct the video signal and data to an optimal state,

The optimal high-definition video signal modified in the FPGA is transmitted to the digital DVR as a digital signal, characterized in that configured to be viewed on a monitor while playing on the digital DVR.

By the digital high-definition (HD-class video) video signal long distance transmission device according to the present invention described above

In order to transmit HD-quality video signals taken by HD cameras to the converter via coaxial cables, the first repeater and the second repeater n-repeaters had to be installed at every 200m interval of the coaxial cable.

Convert digital high definition video signal that could not be transmitted through UTP cable to a signal that can be transmitted via UTP cable, and convert it to digital high definition video signal after long distance transmission By making it possible to check, it is possible to transmit digital high-definition (HD-quality video) video signals up to 2 to 3 km long without installing the first repeater, the second repeater, and the n-th repeater every 200m.

When using a UTP cable with a smaller diameter than a coaxial cable for long-distance transmission of digital high-definition video signals, pipe space efficiency is improved.

Digital high-definition (HD-class video) video signal and power and data taken by the HD camera can be output through the coaxial cable so that it can be used without a separate power line or signal line.

1 is a schematic diagram showing a state of transmitting through a middle coaxial cable.
2 is a schematic view showing an overall configuration of the present invention;

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a diagram illustrating a digital high-definition (HD-level image) long-distance transmission device according to an embodiment of the present invention,

Output digital high-definition (HD-class image) video signal and power and data captured by the HD camera (1) through the coaxial cable (2),

10-bit to 20-bit parallel signal (parallel output: B / T signal) in the first repeater 11 of the transmission unit (TX) 10 that receives the high-definition video signal and power and data from the HD camera (1) Amplify while converting,

The D / A converter 12 receiving the converted parallel signal converts a digital signal of an image signal and data into an analog signal,

The high-definition video signal and data converted into an analog signal through the D / A converter 12 are amplified to compensate for signal attenuation occurring during transmission in the first differential amplifier 13 and then through the UTP cable 15. Up to 2-3 km,

The second differential amplifier 21 of the receiving unit (RX) 20 receiving the high definition video signal and the data of the analog signal transmitted through the UTP cable 15 receives a signal attenuation generated during the transmission of the high quality video signal and the data. Amplify to compensate,

In the A / D converter 22 which receives the high-definition video signal and data of the analog signal amplified by the second differential amplifier 21, the analog signal is converted into a digital signal,

The second repeater 23 receiving the digital signal is amplified while converting it into a parallel signal (B / T signal) of 10 to 20 bits,

A field programmable gate array (FPGA) 24, which is a semiconductor device including a programmable logic element receiving a digital signal of a parallel signal (B / T signal) of 10 bits to 20 bits and a programmable internal line, in the second repeater 23. ) To correct the high-definition video signal and data of the digital signal to the optimal state.

The optimal high-definition video signal modified by the FPGA 24 is transmitted to the digital DVR 30 as a digital signal and configured to be viewed on the monitor 31 while playing back the digital DVR 30.

Here, the data transmitted from the HD camera 1 to the D / A converter 11 includes state information such as angle of view, zoom, and contrast, including state information according to the self-diagnosis result of the HD camera 1. To be included.

The data of the digital signal optimized in the FPGA 24 is transferred to a controller (not shown) to control the HD camera 1.

The digital high-definition video signal long distance transmission device of the present invention configured as described above is an analog signal when transmitting digital high-definition video signal through a UTP (Unshieled Twisted Pair) cable 13. By converting and transmitting, it is possible to transmit up to 2 ~ 3km, which is much longer than 200m when transmitting as a digital signal.

The digital high-definition (HD-class video) image signal and power and data captured by the HD camera 1 are superimposed and output through one coaxial cable 2.

10-bit to 20-bit parallel signal (parallel output: B / T signal) in the first repeater 11 of the transmission unit (TX) 10 that receives the high-definition video signal and power and data from the HD camera (1) Amplify while converting.

As described above, converting a parallel signal (B / T signal) has a bandwidth that is too large to send in real time without compressing a high frequency signal of 1.485 GHZ. Through this, the frequency is lowered to the MHZ band to transmit an image.

The D / A converter 12 receiving the converted parallel signal converts a digital signal of an image signal and data into an analog signal which is a signal that can be loaded on a UTP cable.

The data includes state information according to the self-diagnostic result of the HD camera 1 to include state information such as angle of view, zoom, and contrast.

The high-definition video signal and data converted into an analog signal through the D / A converter 12 are amplified to compensate for signal attenuation occurring during transmission in the first differential amplifier 13 and then the analog signal is converted into a UTP cable (14). ) Up to 2 ~ 3Km.

The second differential amplifier 21 of the receiving unit (RX) 20 receiving the high definition video signal and the data of the analog signal transmitted through the UTP cable 14 receives the high quality video signal and the data attenuated during transmission. Amplify to compensate.

The A / D converter 22 that receives the high-definition video signal and data of the analog signal amplified by the second differential amplifier 21 converts the analog signal into a digital signal.

The second repeater 23 receiving the digital signal is amplified while converting it into a parallel signal (B / T signal) of 10 to 20 bits.

A field programmable gate array (FPGA) 24, which is a semiconductor device including a programmable logic element receiving a digital signal of a parallel signal (B / T signal) of 10 bits to 20 bits and a programmable internal line, in the second repeater 23. ), The high-definition video signal and data of the digital signal are corrected to an optimal state by internal logic elements and programs.

The optimal high-definition video signal modified in the FPGA is transmitted to the digital DVR as a digital signal, characterized in that configured to be viewed on a monitor while playing on the digital DVR.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the scope of the invention. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

1: HD camera 2: Coaxial cable
10: transmitter 11, 23: repeater
12: D / A converter 13, 21: differential amplifier
15: UTP cable 20: receiver
22: A / D converter 24: FPGA
30: Digital DVR 31: Monitor

Claims (7)

Video signals converted from analog high-definition (HD-class) video signals taken by the HD camera 1 to analog signals that can be loaded on UTP cables are converted to analog signals up to 2 ~ 3Km via UTP cable. In the digital high-definition video signal long distance transmission device,
Digital high-definition (HD-class image) video signal and power and data taken by the HD camera 1 is output through the coaxial cable (2),
The first repeater 11 of the transmission unit (TX) 10 that receives the digital high-definition video signal and power and data is converted into a parallel signal of 10bit to 20bit (B / T signal). While amplifying and transmitting up to 2 ~ 3Km through the UTP cable (15),
Amplifying while converting a high-definition video signal transmitted through the UTP cable 15 and a parallel signal (B / T signal) of 10bit to 20bit in the second repeater 23 of the receiving unit (RX) 20 that receives the data ,
In the FPGA 24 receiving the conversion-amplified digital signal from the second repeater 23, the high-definition video signal and data of the digital signal are corrected to the original state,
The original high definition video signal modified by the FPGA 24 is transmitted to the digital DVR 30 as a digital signal and reproduced by the digital DVR 30 so as to be viewed on the monitor 31. HD video) long distance transmission device for video signal. delete delete The method according to claim 1,
Output digital high-definition (HD-class video) video signal and power and data captured by the HD camera (1) through the coaxial cable (2),
In the D / A converter 12 of the TX unit 10 that receives the digital high definition image signal and power and data, the digital high definition image signal and the digital signal of the data are analog. Convert it to a signal,
The converted analog high-definition video signal and data are amplified to compensate for the signal attenuation generated during transmission in the first differential amplifier 13 and transmitted to the 2 ~ 3Km through the UTP cable 15,
In the second differential amplifier 21 of the receiving unit (RX) 20 which receives the analog high definition video signal and data transmitted through the UTP cable 15, the analog high definition video signal and data are attenuated during signal transmission. Amplify to compensate
The A / D converter 22 receiving the amplified analog high definition video signal and data converts the analog high definition video signal and data into a digital high definition video signal and data,
In the FPGA 24 receiving the digital high definition video signal and data, the digital high definition video signal and data are modified to an original state,
The original high definition video signal modified by the FPGA 24 is transmitted to the digital DVR 30 as a digital signal and reproduced by the digital DVR 30 so as to be viewed on the monitor 31. HD video) long distance transmission device for video signal. The method according to claim 1,
Digital high-definition (HD-class) video signal and power and data taken by the HD camera (1) is output through the coaxial cable (2),
Amplifying while converting the digital high-definition video signal, power and data into a parallel signal (B / T signal) of 10 to 20 bits in the first repeater 11 of the transmitting unit (TX) 10,
In the D / A converter 12 of the transmitter (TX) 10 receiving the converted parallel signal, digital high definition video signals and data are converted into analog high definition video signals and data,
The converted analog high-definition video signal and data are amplified to compensate for signal attenuation generated during transmission in the first differential amplifier 13 of the transmitter (TX) 10 and then transmitted through the UTP cable 15. ,
In the second differential amplifier 21 of the receiving unit (RX) 20 which receives the analog high definition video signal and data transmitted through the UTP cable 15, the analog high definition video signal and data are attenuated during signal transmission. Amplify to compensate
The A / D converter 22 of the receiver (RX) 20 receiving the amplified analog high definition video signal and data converts the analog high definition video signal and data into digital high definition video signal and data,
The second repeater 23 of the receiving unit (RX) 20 that receives the digital high-definition video signal and data is amplified while converting it into a parallel signal (B / T signal) of 10 to 20 bits,
In the FPGA 24 of the receiving unit (RX) 20 that receives the digitally amplified and amplified data in the second repeater 23, the digital high definition image signal and data are corrected to an original state,
The original high definition video signal modified by the FPGA 24 is transmitted to the digital DVR 30 as a digital signal and reproduced by the digital DVR 30 so as to be viewed on the monitor 31. HD video) long distance transmission device for video signal. The HD camera 1 shoots digital high-definition video.
Multi-transmitting digital high-definition video signal, power and data through coaxial cable (2),
The first repeater 11 of the transmitter (TX) 10 amplifies while converting the digital high-definition video signal and data into a parallel signal (BT signal) of 10 to 20 bits,
The D / A converter 12 of the transmitter (TX) 10 receives the converted parallel signal and converts the digital high definition image signal and data into analog high definition image signal and data,
The first differential amplifier 13 of the transmitter (TX) 10 amplifies the high-definition video signal and data converted into the analog signal to compensate for signal attenuation generated during transmission, and then, through the UPT cable 15, Transmits the high-definition video signal and data of the converted and amplified analog signal of 2 ~ 3Km,
The second differential amplifier 21 of the receiver (RX) 20 receives the analog high-definition video signal and data transmitted through the UPT cable 15 and amplifies to compensate for signal attenuation generated during transmission.
The A / D converter 22 of the receiver (RX) 20 receives the amplified analog high definition video signals and data, and converts analog high definition video signals and data into digital high definition video signals and data,
The second repeater 23 of the receiver (RX) 20 receives the digital high-definition video signal and data and amplifies it by converting it into a parallel signal (BT signal) of 10 to 20 bits,
The FPGA 24 of the receiver (RX) 20 receives the digital high definition video signal and data converted and amplified by the second repeater 23 and modifies the digital high definition video signal and data to its original state.
The digital DVR 30 receives and reproduces the original digital high-definition video signal modified by the FPGA 24.
Monitor 31 is a digital high-definition (HD-class video) long-distance transmission device, characterized in that to check the video signal reproduced by the digital DVR (30). delete

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