KR100550842B1 - Multi-RF transmission system - Google Patents

Abstract

The present invention relates to a multi-RF transmission system, wherein RF signals from an image signal transmission device (TX; TX _{1 to} TX _N ) are combined into one RF output signal by an RF signal combiner (CB; CB ₁ and CB ₂ ). Since the RF signal splitters are divided into individual RF signals by the RF signal divider (DV; DV ₁ , DV ₂ ), merging each RF signal for RF signal transmission using a single video signal transmission cable is greatly simplified. The separation of the merged RF signals transmitted through the single video signal transmission cable is greatly simplified, and the processing speed of the video signal is greatly improved, thereby simplifying the wiring work for the RF signal transmission between the camera installation site and the control center. It works.

Description

Multi-RF Transmission System             

1 is a block diagram showing a multi-RF transmission system according to the present invention;

FIG. 2 is a block diagram showing the video signal transmission device shown in FIG. 1;

3 is a block diagram showing an image signal receiving apparatus shown in FIG. 1;

4 is a block diagram showing another example of the image signal receiving apparatus shown in FIG. 3;

5 is a configuration diagram showing another example of a multi-RF transmission system according to the present invention;

6 is a block diagram showing the video signal transmission device shown in FIG.

FIG. 7 is a block diagram showing an image signal receiving apparatus shown in FIG. 5;

FIG. 8 is a block diagram illustrating another example of the image signal receiving apparatus shown in FIG. 7.

-Explanation of terms for the main parts of the accompanying drawings-

A; Audio amplifier, AR; Sound Recorder,

C ₁ -C _N ; Camera, CB, CB ₁ , CB ₂ ; Rf signal coupler,

DV, DV ₁ , DV ₂ ; RF signal splitter, E; Control signal modulator,

I; Input unit, M _{1 to} M _N ; MIC,

MP; Main control unit, O; Output unit,

OF; Band filter, R ₁ to R _N ; Drive mechanism,

RX, RX ₁ ~RX _N; Video signal receiver, RX1, RX1 '; Rf signal amplifier,

RX2; Control unit, RX3, RX3 '; Intermediate frequency oscillator,

RX4, RX4 '; Intermediate frequency converter, RX5; Intermediate frequency select filter,

RX6; Intermediate frequency amplifier, RX7; Intermediate frequency filter,

RX8; Demodulator, RX9; Impedance matching machine,

RX10, RX10 '; Frequency band selection filter, S; speaker,

SW; Control switch unit, TA; Bidirectional amplifier,

TX, TX _1- TX _N ; Video signal transmission apparatus, TX1; Video signal primary amplifier,

TX2; Impedance matcher, TX3; Video signal secondary amplifier,

TX4; Control unit, TX5; Rf oscillator,

TX6; RF converter, TX7; Impedance matching machine,

TX8; Bandpass filter, TX9; Control signal demodulator,

TX10; Control signal modulator, TX11; Audio signal primary amplifier,

TX12; Audio signal secondary amplifier, TX13; oscillator,

TX14; Audio signal frequency converter, TX15; Merge,

VR; Video recorder / player.

The present invention relates to a multi-RF transmission system, a transmission of video signals input through a plurality of cameras is satisfactorily performed, and a multi-RF transmission system that is simple and convenient cable installation work.

As is well known, closed circuit television (CCTV) systems are television transmission systems aimed at serving only specific receivers, and because they use wired or special wireless transmission lines from the transmitting side to the receiving side, the general public. Has a feature that you can not receive at will.

Such closed-circuit television systems are now widely used throughout the industrial and industrial sectors, such as education, medical and local information services, and are also referred to as industrial television (ITV) or dedicated television.

The conventional closed circuit television system has a structure in which a plurality of cameras and a video output device that receives video signals inputted from these cameras and outputs them to a display are individually connected to each other via a cable. In addition, the wiring of the cable is complicated, and a problem arises that the cable installation cost is high.

In order to solve this problem, a closed circuit television system such as Korean Patent Publication No. 199701 has been proposed and is currently widely used.

According to this, the camera multiple receivers 20 to 2n (corresponding to the video signal transmission apparatus of the present invention hereinafter referred to as the video signal transmission apparatus) are individually connected to the plurality of cameras CA1 to CAn through the image transmission cable. Each camera multiple receiver 20 to 2n is serially serially connected to the camera multiplex transmitter 30 (corresponding to the video signal receiver of the present invention hereinafter referred to as a video signal receiver) via a single video transmission cable. Due to the connection structure, the cable installation work is greatly simplified.

In addition, the Republic of Korea Patent Publication No. 227413 is an invention of the closed-circuit television system of the Republic of Korea Patent Publication No. 199701, a multi-transmitter (MR1 ~ MRn; corresponds to the video signal transmission device of the present invention-below video signal transmission device Through a single video transmission cable to serially connect the terminology) and multiple transmission / reception centers (MT; corresponding to the video signal receiving apparatus of the present invention-hereafter termed the video signal transmitting apparatus) in series, The camera operation control signal is also transmitted.

However, such a cable series-connected closed circuit television system, video signals from a plurality of cameras are gradually progressively merged by the corresponding video signal transmission apparatus, finally forming a single modulated video signal form, and the video signal through a single cable. In order to progressively merge camera video signals, the structure of the video signal transmission apparatus becomes complicated, and demodulating the progressively merged video signals into one video signal into individual video signals. In order to require a fairly complicated process, the data processing capacity of the video signal receiving apparatus is required to be larger, and the delay time of the video signal and the control signal is greatly increased.

Accordingly, the present invention has been invented to solve the above problems, and provides a multi-RF transmission system for smoothly transmitting the video signal input through a plurality of cameras, and simple and convenient cable installation work. Has its purpose.

The present invention for achieving the above object, a plurality of cameras; A plurality of video signal transmission devices which are individually connected to each camera via an image transmission cable, modulate the video signal from the camera into an RF signal having an address signal, and output the RF signal combiner; An RF signal combiner individually connected to each video signal transmission device through a video transmission cable and combining RF signals from the video signal transmission device into one and outputting the RF signals to an RF signal splitter; An RF signal splitter connected to the RF signal combiner via an image transmission cable, for separating the RF output signals combined from the RF signal combiner into individual RF signals and then outputting these RF signals to each image signal receiving apparatus; A plurality of video signal receivers which are individually connected to the RF signal splitter via a video transmission cable, take only a corresponding RF signal among the RF signals input from the RF signal splitter, and demodulate it into a video signal and then output it to the main control unit; A main control unit connected to each video signal receiving apparatus individually through a video transmission cable to store video signals input from each video signal receiving apparatus, or output them to an output unit; An input unit connected to the main control unit via a data transmission cable to control the operation of the main control unit; It is connected to the main control unit via an image transmission cable, and has a structure comprising an output unit for visually outputting the video signal input from the main control unit.

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

Referring to Figure 1, a multi-RF transmission system according to the present invention, a plurality of cameras (C ₁ ~C _N) and; It is individually connected to each camera C _{1 to} C _N through an image transmission cable, and modulates an image signal from the cameras C _{1 to} C _N into an RF signal having an address signal, thereby providing an RF signal combiner (CB; CB). ₁ , CB ₂ ) a plurality of video signal transmission apparatuses TX (TX; TX _{1 to} TX _N ); It is connected to each video signal transmitter TX (TX _{1 to} TX _N ) individually through the image transmission cable, and combines RF signals from the video signal transmitter TX (TX _{1 to} TX _N ) into one. divider _{(DV; DV 1, DV 2} ) RF signal combiner which outputs a _{(CB; CB 1, CB 2} ); In the video transmission cable intermediate RF signal coupler is connected to a (CB CB _1, CB _2), the RF signal coupler; After separating the RF output signal coupled to one of from (CB CB _1, CB ₂₎ as a separate RF signal RF signal splitters (DV; DV ₁ , DV ₂ ) for outputting these RF signals to respective video signal receivers (RX; RX _{1 to} RX _N ); It is connected to the RF signal splitter DV (DV ₁ , DV ₂ ) separately through the image transmission cable, and takes only the corresponding RF signal among the RF signals inputted from the RF signal splitter DV (DV ₁ , DV ₂ ). A plurality of video signal receivers RX (RX _{1 to} RX _N ) which output the demodulated signal to the main control unit MP after demodulation to the RX; It is connected to each video signal receiving device RX (RX _{1 to} RX _N ) individually through an image transmission cable, and stores the video signals inputted from each video signal receiving device RX (RX _{1 to} RX _N ), or A main control unit MP outputting to the output unit O; An input unit I connected to the main control unit MP via a data transmission cable to control the operation of the main control unit MP; It is connected to the main control unit MP via an image transmission cable, and has a structure consisting of an output unit O for visually outputting the video signal input from the main control unit MP.

In this embodiment, if the video signal transmission device (TX; TX ₁ ~TX _N) roneun, as shown in Figure 2, a camera (C ₁ ~C _N) by first amplifying the drive voltage of an image signal input from the transmission loss A video signal primary amplifier TX1 that compensates for the loss; A video signal secondary amplifier TX3 for amplifying the voltage of the video signal input from the video signal primary amplifier TX1 secondly and outputting a video signal having an appropriate voltage value for RF conversion; An RF oscillator TX5 for outputting an oscillation signal for RF conversion; A control unit TX4 for controlling the operation of the RF oscillator TX5; An RF converter TX6 that modulates the video signal from the video signal secondary amplifier TX3 and the oscillation signal from the RF oscillator TX5 and modulates the signal into an RF signal; An impedance matcher TX7 for matching the impedance of the RF signal input from the RF converter TX6 to a specific value and outputting the impedance to the RF signal combiner CB CB ₁ and CB ₂ was used.

In addition, the video signal receiving device (RX; RX ₁ ~RX _N) roneun, as shown in Figure 3, the RF signal splitter; amplifies the voltage of the RF signal input from the (DV DV _1, DV ₂₎ transmission loss RF signal amplifier (RX1) to compensate for; An intermediate frequency oscillator (RX3) for outputting an oscillation signal for intermediate frequency conversion; Intermediate frequency converter RX4 which combines the RF signals from the RF signal amplifier RX1 and the oscillation signal from the intermediate frequency oscillator RX3 and converts only the corresponding RF signal among the RF signals into an intermediate frequency signal having a specific value. ; An intermediate frequency selection filter RX5 which takes only an intermediate frequency signal among the signals input from the intermediate frequency converter RX4 and outputs the intermediate frequency signal; An intermediate frequency amplifier (RX6) for amplifying the voltage of the intermediate frequency signal input from the intermediate frequency selection filter (RX5) to compensate for transmission loss; An intermediate frequency filter (RX7) for filtering the intermediate frequency signal input from the intermediate frequency amplifier (RX6) to remove the interference signal; A demodulator (RX8) for demodulating the intermediate frequency signal input from the intermediate frequency filter (RX7) into an image signal and outputting the demodulated signal; A control unit RX2 for controlling the operation of the intermediate frequency oscillator RX3 and the demodulator RX8; An impedance matcher RX9 is used, which matches the impedance of the video signal input from the demodulator RX8 to a specific value and outputs it to the main control unit MP.

Referring to the operation of the multi-RF transmission system according to this embodiment are as follows.

The video signal input from the cameras C _{1 to} C _N to the video signal transmission apparatus TX (TX _{1 to} TX _N ) is amplified by the video signal primary amplifier TX1 to compensate for the transmission loss, and the video signal. After being amplified to an appropriate value for RF conversion by the secondary amplifier TX3, it is converted into an RF signal by the RF converter TX6, and then the RF signal combiner CB through the impedance matcher TX7 (CB; CB ₁ , CB). ₂ ) Here, each of the video signal transmission device (TX; TX ₁ ~TX _N) in order to selectively take the demodulation only the video signal from any of the cameras (C ₁ ~C _N) from among the RF signal outputted from each video signal transmission By differentiating the oscillation signals output from the RF oscillator TX5 of the devices TX (TX _{1 to} TX _N ), the RF signals output from the respective image signal transmission devices TX (TX _{1 to} TX _N ) are different from each other. It should stand out.

RF signals outputted from the respective video signal transmitting apparatuses TX (TX _{1 to} TX _N ) are inputted to RF signal combiners CB CB ₁ and CB ₂ and combined into a single RF signal, followed by a single video signal transmission cable. a through RF signal divider _{(DV; DV 1, DV 2} ) the transmission is, the RF signal splitter single RF output from _{the;; (CB 1, CB 2} CB) (DV DV 1, DV 2) to the transmitted RF signal combiner The signals are separated into individual RF signals by the RF signal splitters DV (DV ₁ and DV ₂ ) and output to the image signal receivers RX (RX _{1 to} RX ₂ ). The RF signal combiner CB (CB ₁ , CB ₂ ) and the RF signal splitter (DV; DV ₁ , DV ₂ ) are the number of RF signals from the video signal transmitters TX; TX _{1 to} TX _N. As a matter of course, the RF signals can be combined and separated step by step over aberrations. Here, the drawing code "CB ₁ " is an RF signal primary combiner for combining the RF signal output from each video signal transmitting apparatus (TX; TX _{1 to} TX _N ) into one primary RF output signal, and the drawing code "CB". ₂ "is an RF signal secondary combiner that combines the primary RF output signal output from each RF signal primary combiner (CB ₁ ) into one secondary RF output signal, and the drawing code" DV ₁ "is the secondary RF signal. RF signal primary splitting unit for first separating the secondary RF output signal output from the combiner (CB ₂ ) into an RF output signal corresponding to the primary RF output signal of the RF signal primary combiner (CB ₁ ), and a drawing code " DV ₂ "is an RF signal secondary divider which secondarily separates an RF output signal outputted from the RF signal primary divider and outputs it to each video signal receiver RX (RX _{1 to} RX _N ).

RF signals input from the RF signal splitters DV, DV ₁ , and DV ₂ to the image signal receivers RX (RX _{1 to} RX _N ) are amplified by the RF signal amplifier RX1 to compensate for a transmission loss. In addition, only the corresponding RF signal is converted into an intermediate frequency signal having a specific value by the intermediate frequency converter RX4. Here, the intermediate frequency oscillator RX3 of the video signal receiving apparatus RX (RX _{1 to} RX _N ) considers the oscillation signal of the RF oscillator TX5 which is different from each other, and thus the oscillation signal of each intermediate frequency oscillator RX3. In other words, when the RF signals from the RF signal amplifier RX1 and the oscillation signal from the intermediate frequency oscillator RX3 are mutually combined in the intermediate frequency converter RX4, only the corresponding RF signal has an intermediate frequency signal having a specific value. The remaining RF signals are converted to a signal having a higher frequency or a lower frequency. The intermediate frequency selection filter RX5 receives the output signal from the intermediate frequency converter RX4 and takes out only the intermediate frequency signal and outputs the dual frequency signal to the intermediate frequency amplifier RX6. The intermediate output from the intermediate frequency selection filter RX5 The frequency signal is then amplified by the intermediate frequency amplifier RX6 to compensate for the transmission loss, and then input to the demodulator RX8 with the interference signal removed by the intermediate frequency filter RX7. The demodulator RX8 is operatively controlled by the control unit RX2 to demodulate the intermediate frequency signal input from the intermediate frequency filter RX7 into a video signal before being modulated and demodulated by the demodulator RX8. Is output to the main control unit MP through the impedance matcher RX9.

The video signals output from the video signal receivers RX (RX _{1 to} RX _N ) are individually input to the main control unit MP, and the main control unit MP is operated and controlled by the input unit I. The video signals received from the video signal receivers RX (RX _{1 to} RX _N ) are stored or output to the output unit (O). Here, the main control unit MP may selectively store only some of the video signals input from the respective video signal receivers RX (RX _{1 to} RX _N ), or individually store all the video signals, and output unit. The video signal output as (O) may be changed in various forms. For example, the image signals input from the main control unit MP are image processed, so that image signals from all the cameras C _{1 to} C _N are output to one output unit O, or a specific camera C ₁ is output. Of course, only the video signal from ˜C _N ) may be output or the size of the video output through the output unit O may be arbitrarily adjusted. As the input unit I, a mouse, a keyboard, or a switch mechanism specially manufactured according to the purpose may be used. The display unit 0 may display a monitor or TV that can output a video signal. Is used.

According to the present invention, after the RF signals from the video signal transmission apparatus TX (TX _{1 to} TX _N ) are combined into one RF output signal by the RF signal combiner CB (CB ₁ and CB ₂ ), the RF signal splitter ( Since the DV is divided into individual RF signals by the DV ₁ and DV ₂ , the merging of the RF signals for the RF signal transmission using a single image signal transmission cable is greatly simplified, and the single image signal transmission is performed. Separating the merged RF signals transmitted through the cable is greatly simplified, which greatly improves the video signal processing speed.

Also, the RF signal combiner _{(CB; CB 1, CB 2} ) , the suitable position {camera which can shorten the average length of the connection with the camera _{(C 1 ~C N) (C} 1 ~C N) is installed, Since the RF signal splitter DV (DV ₁ , DV ₂ ) is installed at a control station or its peripheral location, the wiring work for transmitting the RF signal between the installation site and the control station can be simplified.

On the other hand, the present invention, as shown in Figure 1, by installing a plurality of camera driving mechanism (R _{1 ~} R _N ), band filter (OF) and control signal modulator (E), the image signal transmission device (TX; TX) Each camera (C) without installing a separate wiring line for transmitting a control signal to the camera driving mechanism (R ₁ to R _N ) between the _{1 to} TX _N ) and the video signal receiver (RX; RX _{1 to} RX _N ). ₁ ~C _N) that may be controlled to operate by the camera drive mechanism (R ₁ ~R _N).

The camera drive mechanism (R ₁ ~R _N) is sent to the data transmission cable parameters for each video signal transmission device; to be controlled are individually connected to the (TX TX ₁ ~TX _N) operation, the camera (C ₁ ~C _N ) Is a driving mechanism to adjust the shooting position, shooting angle, shooting distance, etc.

The band filter (OF) is installed on an image transmission cable connecting the RF signal combiner (CB; CB ₁ , CB ₂ ) and the RF signal splitter (DV; DV ₁ , DV ₂ ), and the RF signal combiner (CB; CB). The output signal from ₁ , CB ₂ is transmitted to the RF signal splitter DV (DV ₁ , DV ₂ ), while the RF control signal from the control signal modulator E is the RF signal combiner CB ₁ , CB ₁ , CB. ₂ ), so that the RF control signal from the control signal modulator E is transmitted to the video signal transmitting apparatus TX (TX _{1 to} TX _N ) through the RF signal combiners CB (CB ₁ and CB ₂ ).

The control signal modulator E is connected to the main control unit MP via a data transmission cable, and is connected to a band filter OF via an image transmission cable, and is connected to the camera driving mechanism from the main control unit MP. The control signal for controlling (R ₁ to R _N ) is input, modulated into an RF control signal, and output to the band filter OF.

As in this embodiment, the camera drive mechanism (R ₁ ~R _N) a video signal transmission device; in order to allow motion control by (TX TX ₁ ~TX _N), the video signal transmission device (TX; TX ₁ ~TX _N ) demodulates the RF control signal from the RF signal combiner (CB; CB ₁ , CB ₂ ) and outputs it to the camera driving mechanism (R ₁ to R _N ) to transmit an image signal transmission device (TX; TX _{1 to} TX _N). ), The camera driving mechanism (R _{1 ~} R _N ) should be controlled by the output signal.

In the case of this embodiment, the video signal transmitting device (TX; TX ₁ ~TX _N) roneun As shown in Figure 2, a camera (C ₁ ~C _N) by first amplifying the drive voltage of an image signal input from the transmission loss A video signal primary amplifier TX1 that compensates for the loss; A video signal secondary amplifier TX3 for amplifying the voltage of the video signal input from the video signal primary amplifier TX1 secondly and outputting a video signal having an appropriate voltage value for RF conversion; An RF oscillator TX5 for outputting an oscillation signal for RF conversion; A control unit TX4 for controlling the operation of the RF oscillator TX5; An RF converter TX6 that modulates the video signal from the video signal secondary amplifier TX3 and the oscillation signal from the RF oscillator TX5 and modulates it into an RF signal; An impedance matcher TX7 for matching the impedance of the RF signal input from the RF converter TX6 to a specific value and outputting the impedance to the RF signal combiner CB CB ₁ and CB ₂ ; It is installed in the image transmission cable connecting the impedance matcher (TX7) and the RF signal combiner (CB; CB ₁ , CB ₂ ), the output signal from the impedance matcher (TX7) is RF signal combiner (CB; CB ₁ , CB ₂ ) a band filter TX8 for transmitting the RF control signal from the RF signal combiner CB ₁ and CB ₂ to the control signal demodulator TX9; A control signal demodulator TX9 for demodulating the RF control signal input from the band pass filter TX8 and outputting the demodulated signal to the control signal modulator TX10; The control signal modulator TX10 which modulates the control signal input from the control signal demodulator TX9 so as to be capable of data transmission and outputs it to the camera drive mechanisms R ₁ to R _N is used.

The multi-RF transmission system is classified into a VHF method of 30 to 300 MHz and a UHF method of 300 to 3,000 MHz according to a frequency band used as a video signal. As is well known, the VHF method is limited to about 12 channels. Therefore, in order to process a larger number of video signals, the number of broadcast channels must be increased in parallel with the VHF method and the UHF method.

In this case, when the video signal receivers RX (RX _{1 to} RX _N ) shown in FIG. 4 are used, both VHF and UHF video signals can be processed.

Referring to FIG. 4, the image signal receiving apparatus RX (RX _{1 to} RX _N ) according to the present embodiment includes an RF corresponding to the UHF band among RF signals input from the RF signal splitters DV; DV ₁ and DV ₂ . A first frequency band selection filter RX10 for outputting only a signal; An RF signal first amplifier RX1 for compensating transmission loss by amplifying voltages of the UHF band RF signals input from the first frequency band selection filter RX10; An intermediate frequency first oscillator (RX3) for outputting an oscillation signal for intermediate frequency conversion; Combining the UHF band RF signals from the RF signal first amplifier RX1 and the oscillation signal from the intermediate frequency first oscillator RX3 to convert only the corresponding RF signal among the RF signals into an intermediate frequency signal having a specific value. Intermediate frequency first converter RX4; A second frequency band selection filter RX10 'which outputs only an RF signal corresponding to the VHF band among the RF signals input from the RF signal splitter DV (DV ₁ , DV ₂ ); An RF signal second amplifier RX1 'that amplifies the voltage of the VHF band RF signals input from the second frequency band selection filter RX10' to compensate for transmission loss; An intermediate frequency second oscillator RX3 'for outputting an oscillation signal for intermediate frequency conversion; By combining the VHF band RF signals from the RF signal second amplifier RX1 'and the oscillation signal from the intermediate frequency second oscillator RX3', only the corresponding RF signal among the RF signals is converted into an intermediate frequency signal having a specific value. An intermediate frequency second converter RX4 'to convert; An intermediate frequency selection filter RX5 which takes only an intermediate frequency signal among the signals input from the intermediate frequency first and second converters RX4 and RX4 'and outputs it; An intermediate frequency amplifier (RX6) for amplifying the voltage of the intermediate frequency signal input from the intermediate frequency selection filter (RX5) to compensate for transmission loss; An intermediate frequency filter (RX7) for filtering the intermediate frequency signal input from the intermediate frequency amplifier (RX6) to remove the interference signal; A demodulator (RX8) for demodulating the intermediate frequency signal input from the intermediate frequency filter (RX7) into an image signal and outputting the demodulated signal; A control unit RX2 for controlling the operation of the intermediate frequency first and second oscillators RX3 and RX3 'and the demodulator RX8; The impedance matching device RX9 outputs the impedance of the video signal input from the demodulator RX8 to a specific value and outputs it to the main control unit MP.

In addition, the present invention, as shown in Figure 5, by installing a plurality of microphone (M ₁ ~ M _N ) and audio output mechanism, the video signal transmission device (TX; TX ₁ ~ TX _N ) and the video signal receiving device ( RX; RX ₁ and the audio signal from the ~RX _N) without the need to install a separate wiring line for audio signal transmission between, a microphone (M ₁ ~M _N) to be output via the audio output mechanism to listen to it in the traffic control It may be.

The microphones (M ₁ ~M _N), each video signal transmission device; the medium an audio signal transmission cable (TX TX ₁ ~TX _N) are individually connected, at the installation site of the camera (C ₁ ~C _N) It receives the ambient sound and converts it into an electrical signal and outputs it to a video signal transmission device (TX; TX _{1 to} TX _N ).

The audio output unit is individually connected to each of the video signal receiving devices RX (RX _{1 to} RX _N ) via an audio signal transmission cable to receive audio signals from the video signal receiving devices RX (RX _{1 to} RX _N ). Takes input and optionally outputs it externally.

In the multi-RF transmission system according to the present embodiment, the video signals from the cameras C _{1 to} C _N and the audio signals from the microphones M _{1 to} M _N are transmitted to the video signal transmission apparatus TX (TX _{1 to} TX). _N ) after being combined with each other and modulated into an RF signal, an image signal receiver RX; RX ₁ through an RF signal combiner CB; CB ₁ , CB ₂ and an RF signal splitter DV; DV ₁ , DV ₂ . To RX _N ), and each video signal receiver RX (RX _{1 to} RX _N ) selectively demodulates only the corresponding RF signal among the RF signals input from the RF signal splitters DV; DV ₁ and DV ₂ . The demodulated video signal and audio signal are then output to the main control unit MP and the audio output mechanism, respectively.

In the case of the present embodiment, the video signal transmission device; as illustrated in Fig. 6 roneun (TX ₁ TX ~TX _N), the camera (C ₁ ~C _N) transmitted by the voltage of the image signal inputted from the drive amplifier 1 A video signal primary amplifier TX1 that compensates for the loss; A video signal secondary amplifier TX3 for amplifying the voltage of the video signal input from the video signal primary amplifier TX1 secondly and outputting a video signal having an appropriate voltage value for RF conversion; An audio signal primary amplifier TX11 that amplifies the voltage of the audio signal input from the microphones M _{1 to} M _N first and compensates for transmission loss; An audio signal secondary amplifier TX12 that amplifies the voltage of the audio signal input from the audio signal primary amplifier TX11 secondly and outputs an audio signal having an appropriate voltage value for RF conversion; An oscillator (TX13) for outputting an oscillation signal for converting an audio signal frequency; An audio signal frequency converter TX14 for combining and outputting the audio signal from the audio signal secondary amplifier TX12 and the oscillation signal from the oscillator TX13; A merger (TX15) for combining and outputting the video signal from the video signal secondary amplifier (TX3) and the output signal from the frequency converter (TX14); An RF oscillator TX5 for outputting an oscillation signal for RF conversion; A control unit TX4 for controlling the operation of the RF oscillator TX5; An RF converter TX6 that modulates the output signal from the merger TX15 and the oscillation signal from the RF oscillator TX5 and modulates it into an RF signal; An impedance matcher TX7 for matching the impedance of the RF signal input from the RF converter TX6 to a specific value and outputting the impedance to the RF signal combiner CB CB ₁ and CB ₂ was used.

As in the case of the present embodiment, in order to process the RF signal combined with the video signal and the audio signal, a video signal receiver RX (RX _{1 to} RX _N ) as shown in Figs. The configuration of the video signal receivers RX (RX _{1 to} RX _N ) is substantially the same as the video signal receivers RX (RX _{1 to} RX _N ) for processing only the video signals as shown in FIGS. 3 and 4. . However, the demodulator RX8 of the video signal receiver RX (RX _{1 to} RX _N ) for processing both the video signal and the audio signal converts the intermediate frequency from the intermediate frequency filter RX7 into the video signal and the audio signal. After demodulation, the video signal is output through the impedance matching device RX9 to the main control unit MP and the audio signal to the audio output mechanism.

In addition, as shown in Fig. 5, a plurality of camera driving mechanisms R ₁ to R _N , a band pass filter OF and a control signal modulator E are provided to install the camera driving mechanisms R ₁ to R _N. It is a matter of course that a plurality of microphones M _{1 to} M _N and audio output mechanisms can be installed while the cameras C _{1 to} C _N are operated and controlled to listen to the audio around the shooting area at the control station.

In this case, as shown in FIG. 6, the band filter TX8, the demodulator TX9, and the modulator TX10 are reinforced and installed in the image signal transmission apparatus TX (TX _{1 to} TX _N ) for processing the audio signal. Thus, after the RF signal from the RF signal combiner CB (CB ₁ , CB ₂ ) is demodulated by the video signal transmission apparatus TX (TX _1- TX _N ), the camera driving mechanism R ₁ -R through the data signal transmission cable. R to ensure that the input to _N), the video signal transmission device (TX; and that by the output signal from the TX ₁ ~TX _N) is operating camera control drive mechanism (R ₁ ~R _N).

The present invention is not limited to the embodiments as described above, and of course, various modifications can be made without departing from the scope of the following claims.

For example, as illustrated in FIGS. 2 and 6, the impedance of the video signal input from the video signal primary amplifiers TX1 of the video signal transmission apparatus TX (TX _{1 to} TX _N ) is matched to a specific value. By reinforcing and installing the impedance matching device TX2 outputting the video signal to the secondary amplifier TX3, the distortion and transmission loss of the video signal can be further reduced.

Also, the RF signal combiner _{(CB; CB 1, CB 2} ) and the RF signal divider _{(DV; DV 1, DV 2} ) for the video signal transmission cable interconnecting, RF signal combiner _{(CB; CB 1, CB 2} ) Install a one-way amplifier (not shown) to compensate for the transmission loss of the output signal outputted from the circuit, or as shown in FIGS. 1 and 5, the RF signal combiner (CB; CB ₁ , CB ₂ ) and the band filter (OF). the transmission loss of the RF control signal outputted from and CB _1, compensate the transmission loss in the output signal outputted from the CB _2), band pass filter (oF);) for interconnection to the video signal transmission cable, RF signal combiner (CB that Of course, a compensating bidirectional amplifier TA may be provided.

In addition, as shown in Fig. 1, the operation control by the main control unit (MP) to record the video signal from the main control unit (MP) to the peripheral recording medium, or to reproduce the video signal recorded and stored on the peripheral recording medium It is also possible to install a video recorder / player (VR) for outputting it to the main control unit (MP). Here, as the peripheral recording medium, known ones capable of storing video signals such as a video tape, a compact disc (CD), a digital versatile disc (DVD), and the like are used.

In particular, the video signal transmitters TX (TX _{1 to} TX _N ) and the video signal receivers RX (RX _{1 to} RX _N ) may be variously changed in circuits within a range of performing a corresponding function.
Meanwhile, reference numerals "SW", "A", and "S" are components constituting the audio output mechanism, and reference numerals "SW" denote each image signal receiving apparatus RX through an audio signal transmission cable; RX _{1 to} RX _N ) individually connected to the control switch unit for controlling the output of the audio signal, and reference numeral "A" is connected to the control switch unit (SW) via the audio signal transmission cable, the control switch An audio amplifier for amplifying the audio signal from the unit SW, the reference numeral "S" is connected to the audio amplifier A via an audio signal transmission cable, and the amplified audio signal input from the audio amplifier A. Indicates a speaker that outputs to the outside. According to this embodiment, there is an advantage that the image of the field can be observed while listening to the sound of the field in the control station.
In addition, reference numeral "AR" is a recorder connected to the audio amplifier A via an audio signal transmission cable. According to the present embodiment, the audio signal output from the audio amplifier A is recorded through the recorder AR. The advantage is that it can be easily recorded.
These control switch unit (SW) and the audio amplifier (A), the speaker (S) and the recorder (AR) is already well known and widely applied in various fields including the industry, and the performance is carried out, so a detailed description thereof is omitted. Let's do it.

According to the present invention as described above, RF signals from the image signal transmission apparatus (TX; TX _{1 to} TX _N ) are combined into one RF output signal by an RF signal combiner (CB; CB ₁ and CB ₂ ). Since the RF signal splitter (DV; DV ₁ , DV ₂ ) is divided into individual RF signals, the merging of the RF signals for the RF signal transmission using a single video signal transmission cable is greatly simplified. In addition, the task of separating the merged RF signals transmitted through a single video signal transmission cable is greatly simplified, and the video signal processing speed is greatly improved.

Also, the RF signal combiner _{(CB; CB 1, CB 2} ) , the suitable position {camera which can shorten the average length of the connection with the camera _{(C 1 ~C N) (C} 1 ~C N) is installed, The RF signal splitters DV (DV ₁ , DV ₂ ) are installed at a control station or a peripheral location thereof, thereby simplifying wiring work for transmitting RF signals between a camera installation site and the control station.

Claims (12)

A plurality of cameras (C ₁ ~C _N) and; It is individually connected to each camera C _{1 to} C _N through an image transmission cable, and modulates an image signal from the cameras C _{1 to} C _N into an RF signal having an address signal, thereby providing an RF signal combiner (CB; CB). ₁ , CB ₂ ) a plurality of video signal transmission apparatuses TX (TX; TX _{1 to} TX _N ); It is connected to each video signal transmitter TX (TX _{1 to} TX _N ) individually through the image transmission cable, and combines RF signals from the video signal transmitter TX (TX _{1 to} TX _N ) into one. RF signal combiner which outputs _{a; (DV DV 1, DV 2} ) (CB; CB 1, CB 2); In the video transmission cable intermediate RF signal coupler is connected to a (CB CB _1, CB _2), the RF signal coupler; After separating the RF output signal coupled to one of from (CB CB _1, CB ₂₎ as a separate RF signal RF signal splitters (DV; DV ₁ , DV ₂ ) for outputting these RF signals to respective video signal receivers (RX; RX _{1 to} RX _N ); It is connected to the RF signal splitter DV (DV ₁ , DV ₂ ) separately through the image transmission cable, and takes only the corresponding RF signal among the RF signals inputted from the RF signal splitter DV (DV ₁ , DV ₂ ). A plurality of video signal receivers RX (RX _{1 to} RX _N ) which output the demodulated signal to the main control unit MP after demodulation to the RX; It is connected to each video signal receiving device RX (RX _{1 to} RX _N ) individually through an image transmission cable, and stores the video signals inputted from each video signal receiving device RX (RX _{1 to} RX _N ), or A main control unit MP outputting to the output unit O; An input unit I connected to the main control unit MP via a data transmission cable to control the operation of the main control unit MP; A multi-RF transmission system, comprising an output unit (O) connected to the main control unit (MP) via an image transmission cable to visually output a video signal input from the main control unit (MP). The apparatus of claim 1, wherein the video signal transmission apparatus (TX; TX _{1 to} TX _N ) comprises: A video signal primary amplifier TX1 for firstly amplifying the voltage of the video signal input from the cameras C _{1 to} C _N to compensate for the transmission loss; A video signal secondary amplifier TX3 for amplifying the voltage of the video signal input from the video signal primary amplifier TX1 secondly and outputting a video signal having an appropriate voltage value for RF conversion; An RF oscillator TX5 for outputting an oscillation signal for RF conversion; A control unit TX4 for controlling the operation of the RF oscillator TX5; An RF converter TX6 that modulates the video signal from the video signal secondary amplifier TX3 and the oscillation signal from the RF oscillator TX5 and modulates the signal into an RF signal; A multi-RF transmission system comprising an impedance matcher (TX7) for matching the impedance of the RF signal input from the RF converter (TX6) to a specific value and outputting it to the RF signal combiner (CB; CB ₁ , CB ₂ ) . The method of claim 1, wherein each of the video signal transmission device; shooting location or a shooting (TX ₁ TX ~TX _N), which are individually connected to the operation control to mediate the data transfer cable to the camera (C ₁ ~C _N) A plurality of camera drive mechanisms R ₁ to R _N for adjusting an angle, a shooting distance, and the like; It is installed on the video transmission cable connecting the RF signal combiner (CB; CB ₁ , CB ₂ ) and the RF signal splitter (DV; DV ₁ , DV ₂ ), and outputs from the RF signal combiner (CB; CB ₁ , CB ₂ ). The signal is transmitted to the RF signal splitter DV (DV ₁ , DV ₂ ), and the RF control signal from the control signal modulator E is transmitted to the RF signal combiner CB; CB ₁ , CB ₂ . A band filter (OF) for transmitting an RF control signal from E) to an image signal transmission device (TX; TX _{1 to} TX _N ) through an RF signal combiner (CB; CB ₁ and CB ₂ ); It is connected to the main control unit MP via the data transmission cable, and is connected to the band pass filter OF via the image transmission cable, and controls the camera drive mechanisms R ₁ to R _N from the main control unit MP. A control signal modulator (E) for receiving a control signal for inputting and modulating the signal into an RF control signal and outputting it to a band filter (OF), _{In; (TX 1 ~TX N TX)} RF signal combiner video signal transmission device; After demodulating the RF control signal from the (CB CB _1, CB ₂₎ to output it to the camera drive mechanism (R ₁ ~R _N) Multi RF transmission system characterized by. The apparatus of claim 3, wherein the video signal transmission apparatus (TX; TX _{1 to} TX _N ) comprises: A video signal primary amplifier TX1 for firstly amplifying the voltage of the video signal input from the cameras C _{1 to} C _N to compensate for the transmission loss; A video signal secondary amplifier TX3 for amplifying the voltage of the video signal input from the video signal primary amplifier TX1 secondly and outputting a video signal having an appropriate voltage value for RF conversion; An RF oscillator TX5 for outputting an oscillation signal for RF conversion; A control unit TX4 for controlling the operation of the RF oscillator TX5; An RF converter TX6 that modulates the video signal from the video signal secondary amplifier TX3 and the oscillation signal from the RF oscillator TX5 and modulates it into an RF signal; An impedance matcher TX7 for matching the impedance of the RF signal input from the RF converter TX6 to a specific value and outputting the impedance to the RF signal combiner CB CB ₁ and CB ₂ ; It is installed in the image transmission cable connecting the impedance matcher (TX7) and the RF signal combiner (CB; CB ₁ , CB ₂ ), the output signal from the impedance matcher (TX7) is RF signal combiner (CB; CB ₁ , CB ₂ ) a band filter TX8 for transmitting the RF control signal from the RF signal combiner CB ₁ and CB ₂ to the control signal demodulator TX9; A control signal demodulator TX9 for demodulating the RF control signal input from the band pass filter TX8 and outputting the demodulated signal to the control signal modulator TX10; And a control signal modulator (TX10) for modulating the control signal input from the control signal demodulator (TX9) to be data-transmittable and outputting it to the camera drive mechanisms (R ₁ to R _N ). According to claim 1, wherein each of the video signal transmitting apparatus (TX; TX ₁ ~ TX _N ) is individually connected via an audio signal transmission cable, input the ambient sound of the camera (C _{1 ~} C _N ) installation place A plurality of microphones (M _{1 to} M _N ) for receiving and converting them into electrical signals and outputting them to a video signal transmission device (TX; TX _{1 to} TX _N ); It is connected to each video signal receiver (RX; RX _{1 to} RX _N ) separately through an audio signal transmission cable, and receives the audio signal from the video signal receiver (RX; RX _{1 to} RX _N ) and selectively It is equipped with an audio output mechanism that outputs to the outside, And the video signal from the camera (C ₁ ~C _N), a microphone (M ₁ ~M _N) audio signal, a video signal transmitting apparatus from; are coupled together by (TX TX ₁ ~TX _N) modulated by an RF signal After that, it is transmitted to the video signal receiver RX; RX _{1 to} RX _N through the RF signal combiner CB; CB ₁ and CB ₂ and the RF signal splitter DV; DV ₁ , DV ₂ . In the apparatus RX (RX _{1 to} RX _N ), only the corresponding RF signal is selectively demodulated among the RF signals input from the RF signal splitters DV (DV ₁ and DV ₂ ), and the main control of the demodulated video signal and audio signal is performed. Multi RF transmission system, characterized in that output to the unit (MP) and the audio output mechanism, respectively. The apparatus of claim 5, wherein the video signal transmitting apparatus (TX; TX _{1 to} TX _N ) comprises: A video signal primary amplifier TX1 for firstly amplifying the voltage of the video signal input from the cameras C _{1 to} C _N to compensate for the transmission loss; A video signal secondary amplifier TX3 for amplifying the voltage of the video signal input from the video signal primary amplifier TX1 secondly and outputting a video signal having an appropriate voltage value for RF conversion; An audio signal primary amplifier TX11 that amplifies the voltage of the audio signal input from the microphones M _{1 to} M _N first and compensates for transmission loss; An audio signal secondary amplifier TX12 that amplifies the voltage of the audio signal input from the audio signal primary amplifier TX11 secondly and outputs an audio signal having an appropriate voltage value for RF conversion; An oscillator (TX13) for outputting an oscillation signal for converting an audio signal frequency; An audio signal frequency converter TX14 for combining and outputting the audio signal from the audio signal secondary amplifier TX12 and the oscillation signal from the oscillator TX13; A merger (TX15) for combining and outputting the video signal from the video signal secondary amplifier (TX3) and the output signal from the frequency converter (TX14); An RF oscillator TX5 for outputting an oscillation signal for RF conversion; A control unit TX4 for controlling the operation of the RF oscillator TX5; An RF converter TX6 that modulates the output signal from the merger TX15 and the oscillation signal from the RF oscillator TX5 and modulates it into an RF signal; A multi-RF transmission system comprising an impedance matcher (TX7) for matching the impedance of the RF signal input from the RF converter (TX6) to a specific value and outputting it to the RF signal combiner (CB; CB ₁ , CB ₂ ) . The method of claim 5, wherein the audio output mechanism, A control switch unit (SW) connected to each video signal receiving device (RX; RX _{1 to} RX _N ) individually via an audio signal transmission cable to control the output of the audio signal; An audio amplifier A connected to the control switch unit SW via an audio signal transmission cable to amplify the audio signal from the control switch unit SW; A multi-RF transmission system, comprising: a speaker (S) connected to an audio amplifier (A) via an audio signal transmission cable and outputting an amplified audio signal input from the audio amplifier (A) to the outside. The recording apparatus AR is connected to the audio amplifier A via an audio signal transmission cable, so that an audio signal output from the audio amplifier A can be recorded using the recording apparatus AR. Multi-RF transmission system characterized in that. 7. The impedance according to any one of claims 2, 4 and 6, wherein the impedance of the video signal input from the video signal primary amplifiers TX1 of the video signal transmitters TX (TX _{1 to} TX _N ) is specified. And an impedance matcher (TX2) for matching the values and outputting them to the video signal secondary amplifier (TX3). The apparatus of claim 1, wherein the video signal receivers RX (RX _{1 to} RX _N ) comprise: An RF signal amplifier (RX1) for amplifying the voltage of the RF signals input from the RF signal splitters (DV; DV ₁ , DV ₂ ) to compensate for transmission loss; An intermediate frequency oscillator (RX3) for outputting an oscillation signal for intermediate frequency conversion; Intermediate frequency converter RX4 which combines the RF signals from the RF signal amplifier RX1 and the oscillation signal from the intermediate frequency oscillator RX3 and converts only the corresponding RF signal among the RF signals into an intermediate frequency signal having a specific value. ; An intermediate frequency selection filter RX5 which takes only an intermediate frequency signal among the signals input from the intermediate frequency converter RX4 and outputs the intermediate frequency signal; An intermediate frequency amplifier (RX6) for amplifying the voltage of the intermediate frequency signal input from the intermediate frequency selection filter (RX5) to compensate for transmission loss; An intermediate frequency filter (RX7) for filtering the intermediate frequency signal input from the intermediate frequency amplifier (RX6) to remove the interference signal; A demodulator (RX8) for demodulating the intermediate frequency signal input from the intermediate frequency filter (RX7) into an image signal and outputting the demodulated signal; A control unit RX2 for controlling the operation of the intermediate frequency oscillator RX3 and the demodulator RX8; And an impedance matcher (RX9) for matching the impedance of the video signal input from the demodulator (RX8) to a specific value and outputting it to the main control unit (MP). The method according to any one of claims 1 to 8, wherein the video signal receiving device (RX; RX ₁ ~RX _N) is, A first frequency band selection filter RX10 for outputting only an RF signal corresponding to the UHF band among the RF signals input from the RF signal splitters DV (DV ₁ and DV ₂ ); An RF signal first amplifier RX1 for compensating transmission loss by amplifying voltages of the UHF band RF signals input from the first frequency band selection filter RX10; An intermediate frequency first oscillator (RX3) for outputting an oscillation signal for intermediate frequency conversion; Combining the UHF band RF signals from the RF signal first amplifier RX1 and the oscillation signal from the intermediate frequency first oscillator RX3 to convert only the corresponding RF signal among the RF signals into an intermediate frequency signal having a specific value. Intermediate frequency first converter RX4; A second frequency band selection filter RX10 'which outputs only an RF signal corresponding to the VHF band among the RF signals input from the RF signal splitter DV (DV ₁ , DV ₂ ); An RF signal second amplifier RX1 'that amplifies the voltage of the VHF band RF signals input from the second frequency band selection filter RX10' to compensate for transmission loss; An intermediate frequency second oscillator RX3 'for outputting an oscillation signal for intermediate frequency conversion; By combining the VHF band RF signals from the RF signal second amplifier RX1 'and the oscillation signal from the intermediate frequency second oscillator RX3', only the corresponding RF signal among the RF signals is converted into an intermediate frequency signal having a specific value. An intermediate frequency second converter RX4 'to convert; An intermediate frequency selection filter RX5 which takes only an intermediate frequency signal among the signals input from the intermediate frequency first and second converters RX4 and RX4 'and outputs it; An intermediate frequency amplifier (RX6) for amplifying the voltage of the intermediate frequency signal input from the intermediate frequency selection filter (RX5) to compensate for transmission loss; An intermediate frequency filter (RX7) for filtering the intermediate frequency signal input from the intermediate frequency amplifier (RX6) to remove the interference signal; A demodulator (RX8) for demodulating the intermediate frequency signal input from the intermediate frequency filter (RX7) into an image signal and outputting the demodulated signal; A control unit RX2 for controlling the operation of the intermediate frequency first and second oscillators RX3 and RX3 'and the demodulator RX8; And an impedance matcher (RX9) for matching the impedance of the video signal input from the demodulator (RX8) to a specific value and outputting it to the main control unit (MP). The video signal transmission cable according to any one of claims 1 to 8, wherein the RF signal combiner (CB; CB ₁ , CB ₂ ) and the RF signal splitter (DV; DV ₁ , DV ₂ ) are interconnected. _One- way amplifier is provided to compensate for the transmission loss of the output signal output from the RF signal combiner (CB; CB ₁ , CB ₂ ), or the RF signal combiner (CB; CB ₁ , CB ₂ ) and the band filter (OF) are mutually In the video signal transmission cable to be connected, bidirectional compensation for the transmission loss of the RF control signal output from the band filter (OF) while compensating for the transmission loss of the output signal output from the RF signal combiner (CB; CB ₁ , CB ₂ ). Multi RF transmission system, characterized in that the amplifier (TA) is installed.

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