KR20140050809A - Two wire transmission device and control method therof - Google Patents

Two wire transmission device and control method therof Download PDF

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Publication number
KR20140050809A
KR20140050809A KR1020120117071A KR20120117071A KR20140050809A KR 20140050809 A KR20140050809 A KR 20140050809A KR 1020120117071 A KR1020120117071 A KR 1020120117071A KR 20120117071 A KR20120117071 A KR 20120117071A KR 20140050809 A KR20140050809 A KR 20140050809A
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KR
South Korea
Prior art keywords
signal
unit
frequency band
data signal
outputting
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KR1020120117071A
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Korean (ko)
Inventor
정의성
Original Assignee
주식회사 셈앤텍
정의성
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Application filed by 주식회사 셈앤텍, 정의성 filed Critical 주식회사 셈앤텍
Priority to KR1020120117071A priority Critical patent/KR20140050809A/en
Publication of KR20140050809A publication Critical patent/KR20140050809A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/56—Circuits for coupling, blocking, or by-passing of signals

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

The present invention relates to a two wire transmitter and a method of controlling the same. The two wire transmitter according to the present invention includes: a first filter unit outputting a video signal to a second terminal by filtering the video signal which is allocated to a first frequency band in an input signal; a second filter unit to filter data signal which is allocated to a second frequency band in the input signal; and a PLC unit demodulating the data signal which is filtered in the second filter unit and converting the data signal to a digital signal to be outputted. According to the present invention, the method can transmit and receive data signals and video signals simultaneously using a two wire transmission line. [Reference numerals] (110) First filter unit; (120) Second filter unit; (130) PLC unit; (140) Switching unit; (150) Key input unit; (160) Memory; (170) Power supply unit; (180) Output unit; (190) Control unit

Description

TECHNICAL FIELD [0001] The present invention relates to a two-wire transmission device and a control method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-wire transmission apparatus and a control method thereof, and more particularly, to a two-wire transmission apparatus and a control method thereof capable of simultaneously transmitting and receiving a video signal and a data signal using the same line.

Generally, CCTV cameras are used to detect dangerous work environments, construction sites such as construction and construction, nuclear power plants, chemical plants, shipyards, temporary and temporary surveillance, monitoring of various kinds of violations such as trash dumping, elevators, parking lots, , Military or tactical use for military personnel.

Coaxial cables are used as a transmission medium for transmitting video signals output from such CCTV cameras or other video devices. UTP cable for low-loss and long-distance transmission and optical transmission through optical cable are used due to the development of transmission technology, but the most widely used transmission medium is coaxial cable to date. CCTV cameras that output HD-SDI signals conforming to the SMPTE 292M standard, which is a video format mainly used in recent broadcasts, are also on the market. Coaxial cables should be basically used for transmitting such HD-SDI signals.

On the other hand, when a wired LAN is constructed, it is common to use an 8-line UTP cable called a LAN cable. An RJ45 connector is connected to both ends of the LAN cable, and a terminal is connected to the RJ45 connector.

In this way, wired cable work must be performed to construct a video device such as a CCTV camera and a wired LAN. Especially, in an environment where electromagnetic shielding is necessary or in an environment where wireless communication is difficult, it is necessary to connect various devices with a wired line, so that installation and management of a wired line become complicated.

Therefore, it is necessary to consider a method of easily and conveniently transmitting the video signal output through the video apparatus and the data signal modulated for data communication in a two-wire system.

Accordingly, it is an object of the present invention to provide a two-wire transmission device capable of transmitting and receiving a data signal and a video signal through the same line, and a control method thereof.

According to an aspect of the present invention, there is provided a two-wire transmission apparatus including a first filter unit for filtering a video signal allocated to a first frequency band from an input signal and outputting the filtered video signal, And a PLC unit for demodulating the data signal, converting the data signal into a digital signal, and outputting the digital signal.

The two-wire transmission apparatus according to the present invention may further include a switching unit for distributing the digital signal to one or more communication terminals.

According to another aspect of the present invention, there is provided a method of controlling a two-wire transmission apparatus, the method comprising: filtering a video signal allocated to a first frequency band from an input signal and outputting the filtered video signal; Filtering the signal, and converting the data signal into a digital signal and outputting the demodulated data signal.

According to the present invention, a video signal output from a video device or the like and a data signal modulated for data communication can be simultaneously transmitted and received through the same two-wire line. Accordingly, it is possible to conveniently perform transmission of video signals, Internet communication, and the like through a two-wire line in an environment where wireless communication is difficult.

1 is a block diagram of a two-wire transmission apparatus according to an embodiment of the present invention;
FIG. 2 illustrates a system using a two-wire transmission apparatus according to an embodiment of the present invention. FIG.
3 is a flowchart illustrating a method of controlling a two-wire transmission apparatus according to an exemplary embodiment of the present invention, and FIG.
4 is a diagram referred to explain a frequency band allocated to a video signal and a data signal.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a block diagram of a two-wire transmission apparatus according to an embodiment of the present invention. Referring to FIG. 1, a two-wire transmission apparatus according to an exemplary embodiment of the present invention will be described in terms of functional components.

2, the two-wire transmission apparatus 100 includes a first filter unit 110, a second filter unit 120, a PLC unit 130, a switching unit 140, a key input unit 150, A controller 160, a power supply unit 170, an output unit 180, and a controller 190.

When such components are implemented in practical applications, two or more components may be combined into one component, or one component may be divided into two or more components as necessary.

The first filter unit 110 filters the video signal allocated to the first frequency band from the signal input through the connection terminal 10 and outputs the filtered video signal to the video output terminal 20.

The second filter unit 120 filters the data signal allocated to the second frequency band from the signal input through the connection terminal 10 and outputs the filtered data signal to the PLC unit 130.

The PLC unit 130 includes a PLC (Power Line Communication) modem capable of performing high-speed power line communication. Power Line Communication (PLC) is a technology for communicating voice and data on high frequency signals of several hundreds kHz to several tens of ㎒ using a power line supplying electric power.

Accordingly, the PLC unit 130 demodulates the data signal filtered by the second filter unit 120, converts the data signal into a digital signal, and outputs the digital signal to the switching unit 140. The PLC unit 130 may modulate the digital signal input through the switching unit 140 and output the modulated digital signal to the second filter unit 120. In this case, the second filter unit 120 may allocate the digital signal inputted through the PLC unit 130 to the second frequency band and output it through the connection terminal.

The switching unit 140 distributes the demodulated digital signal to one or more communication terminals 30. For example, in the case of data communication, the switching unit 140 may search for a destination MAC address of a frame, and may transmit a digital signal to a communication terminal 30 to which a destination address is connected.

The key input unit 150 generates key input data that the user inputs to control the operation of the transmission apparatus. The key input unit 150 may include a key pad, a touch pad, and various switches that can receive commands or information by a push or touch operation of a user.

The memory 160 may store a program for processing and controlling the controller 190, and may perform functions for temporarily storing input or output data.

The power supply unit 170 receives external power and internal power under the control of the controller 190 and supplies power required for operation of the respective components.

The output unit 180 is for outputting an audio signal, a video signal, or an alarm signal. The output unit 180 may include a display, an audio output module, an alarm unit, and the like, and may display a transmission state, a control state, and the like.

The controller 190 typically controls the operation of the respective units to control the overall operation of the transmission apparatus 100.

FIG. 2 shows a configuration of a system using a two-wire transmission apparatus according to an embodiment of the present invention.

As shown in FIG. 2, a system in which a first 2-wire transmission apparatus 100 and a second 2-wire transmission apparatus 300 are connected to transmit and receive a video signal and a data signal can be configured. The first two-wire transmission device 100 and the second two-wire transmission device 300 are connected to a two-wire line 250 through connection terminals. A two wire transmission line 250 means a line composed of two lines insulated from each other.

The CCTV camera 310 is connected to the second two-wire transmission device 300 and can be connected to the Internet 350 in a communicable manner. The monitoring unit 210 and the first to third user terminals 210, 220 and 230 are connected to the first two-wire transmission apparatus 100 to display images captured by the CCTV camera 310.

With this configuration, the monitoring unit 210 connected to the first two-wire transmission apparatus 100 can display images taken by the CCTV camera 310 in real time. Also, the first to third user terminals 220, 230, and 240 connected to the first two-wire transmission device 100 can access the Internet or perform other data communication.

With such a configuration, the video signal and the data signal can be simultaneously transmitted and received at the remote place by using the same two-wire line 250.

3 is a flowchart illustrating a method of controlling a two-wire transmission apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the first filter unit 110 filters the video signal allocated to the first frequency band from the signal input through the connection terminal 10 (S400). The first frequency band may use the 500 KHz to 6 MHz band.

The second filter unit 120 filters the data signal allocated to the second frequency band from the signal input through the connection terminal 10 (S405). The second frequency band may be a band of 6 MHz to 30 MHz.

The PLC unit 130 demodulates the filtered data signal to the second filter unit 120, converts the digital signal, and outputs the digital signal (S410). That is, the PLC unit 130 can transmit data by the high-speed power line communication method. In general, a high-speed power line communication can use a modulation / demodulation scheme, a spread spectrum (SS) scheme, a multi-carrier scheme, and an Orthogonal Frequency Division Multiplex (OFDM) scheme.

In the SS system, the SS system multiplies a transmission signal having a single frequency by a digital function to diffuse a single frequency into a wide band, and demodulates the transmission signal by multiplying the same digital function to restore the original single frequency. In the multi-carrier system, when a communication signal is transmitted without processing the SS system or the like in a transmission signal having a single frequency, a large noise of the same frequency occurs in the line and communication becomes impossible. Therefore, a plurality of frequencies (multi- If there is, the effect of noise is reduced by using a carrier other than the frequency of the noise and distributing the transmission signal to the carrier. The OFDM scheme is a scheme of increasing the number of carriers in the multicarrier scheme to the positive pole in the orthogonal frequency multiplexing scheme to densely weigh the carriers. In practice, the transmission signals are dispersed and transmitted to carriers of several hundreds to thousands of frequencies, And restores the original transmission signal.

The switching unit 140 distributes the demodulated digital signal from the PLC unit 130 to one or more communication terminals (S415).

By this process, the video signal and the data signal input through the same two-wire line can be processed.

4 shows a frequency band to which a video signal and a data signal are allocated.

As shown in FIG. 4, a video signal output from a video apparatus such as a CCTV camera is allocated to a frequency band of 500 KHz to 6 MHz. The data signal modulated for data communication or the like can be allocated to the frequency band of 6 MHz to 30 MHz.

Since the frequency band to which the video signal and the data signal are assigned are different from each other, the video signal and the data signal can be simultaneously transmitted and received using the same two-wire line.

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, on the contrary, 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 present invention.

110: first filter unit 120: second filter unit
130: PLC unit 140:
150: key input unit 160: memory
170: Power supply unit 180:
190:

Claims (10)

A first filter unit for filtering and outputting a video signal allocated to a first frequency band from an input signal;
A second filter unit for filtering the data signal allocated to the second frequency band from the input signal; And
And a PLC unit for demodulating the data signal, converting the data signal into a digital signal, and outputting the digital signal. The method according to claim 1,
Further comprising a switching unit for distributing the digital signal to one or more communication terminals. 3. The method of claim 2,
Wherein the PLC unit outputs a data signal modulating a digital signal input through the communication terminal to the second filter unit and the second filter unit assigns a data signal modulating the digital signal to the second frequency band and outputs the data signal Wherein the two-wire transmission device is a two-wire transmission device. The method according to claim 1,
Wherein the first frequency band is 500 KHz to 6 MHz and the second frequency band is 6 MHz to 30 MHz. The method according to claim 1,
Further comprising a key input unit for inputting a user command. The method according to claim 1,
Further comprising an output section for outputting at least one of an audio signal, a video signal, and an alarm signal. Filtering and outputting a video signal allocated to a first frequency band from an input signal;
Filtering a data signal of a second frequency band from the input signal; And
And converting the data signal into a digital signal and outputting the demodulated data signal. 8. The method of claim 7,
Further comprising distributing the digital signal to one or more output terminals. 8. The method of claim 7,
And outputting a data signal generated by modulating the input digital signal to the second frequency band and outputting the data signal. 8. The method of claim 7,
Wherein the first frequency band is 500 KHz to 6 MHz and the second frequency band is 6 MHz to 30 MHz.
KR1020120117071A 2012-10-22 2012-10-22 Two wire transmission device and control method therof KR20140050809A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120117071A KR20140050809A (en) 2012-10-22 2012-10-22 Two wire transmission device and control method therof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120117071A KR20140050809A (en) 2012-10-22 2012-10-22 Two wire transmission device and control method therof

Publications (1)

Publication Number Publication Date
KR20140050809A true KR20140050809A (en) 2014-04-30

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KR1020120117071A KR20140050809A (en) 2012-10-22 2012-10-22 Two wire transmission device and control method therof

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KR (1) KR20140050809A (en)

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