KR100871979B1 - Vod service system and method using hybrid-fiber coaxial - Google Patents

Abstract

Disclosed are a system and method for providing a VOD service using an optical coaxial mixed network for minimizing noise in a cable TV and providing an interactive service. The VOD service providing system according to the present invention recognizes a VOD broadcast signal corresponding to a channel selected by a subscriber in a VOD broadcast server, and transmits the recognized VOD broadcast signal from the VOD broadcast server to an indoor terminal through an optical coaxial mixed network. Means for determining a transmission environment according to a medium in the optical coaxial mixed network, to which the VOD broadcast signal is transmitted, and a medium for signal-switching the VOD broadcast signal corresponding to the determined transmission environment. And a converter.

Cable TV, optical coaxial mixed network, VOD broadcasting, channel information

Description

VOD SERVICE SYSTEM AND METHOD PROVIDING SYSTEM USING OPTICAL COAXIAL MIXED NETWORK

1A is a diagram illustrating a noise source in a conventional unidirectional cable TV system.

1B is a diagram illustrating a noise source in a conventional bidirectional cable TV system.

2 is a diagram showing the overall network configuration in a conventional optical coaxial mixed network.

3 is a diagram illustrating signal processing of a VOD service providing system of the present invention for providing a VOD broadcast signal corresponding to VOD request information.

4 is a diagram illustrating in detail the configuration of a VOD service providing system according to the present invention.

5 is a flowchart illustrating a method of providing a VOD service according to an embodiment of the present invention in detail.

6 is a detailed configuration diagram of a system for providing a VOD broadcast signal and a non-VOD broadcast signal according to an embodiment of the present invention.

7 is a configuration diagram of a VOD service providing system for providing a non-VOD broadcast signal according to an embodiment of the present invention.

8 is a flowchart illustrating a method of providing a signal other than a VOD broadcast according to an embodiment of the present invention in detail.

9 is a flowchart illustrating a procedure of a VOD service providing method according to an embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

400: VOD service providing system

410: VOD broadcast transmission means

420: environmental decision means

425: media converter

430: CLC modem

440: channel change control means

The present invention relates to a system and method for providing a VOD service using an optical coaxial mixed network for minimizing noise in a cable TV and providing an interactive service.

Video On Demand (VOD) means on-demand video, which means that subscribers can select the movie they want by remote control using a computer or TV connected to the network. A communication service that allows people to watch.

In other words, VOD is a service that allows viewers to select and watch the desired content instantly at the desired time, and enables fast-forwarding, rewinding, pausing, and re-watching after watching VOD like normal video or DVD. It is gaining great popularity among viewers because it provides convenience to viewers and can easily provide various genres and contents such as education, drama, and adults as well as movies. So, cable broadcasting companies (SO) are encouraging membership by providing VOD broadcasting service through cable TV system that guarantees the free choice of viewers.

1A is a diagram illustrating a noise source in a conventional unidirectional cable TV system (CATV), and FIG. 1B is a diagram illustrating a noise source in a conventional bidirectional cable TV system.

As shown in FIG. 1A, in the conventional unidirectional cable TV (CATV) system, when the broadcast signal is a downlink signal transmitted from the HEAD END 110, which is a service provider, to the TV receiver of the subscriber 140, the unidirectional amplifier 120 ) And the divider 130, line noise is generated according to the path of the downlink signal.

In addition, even in the bidirectional cable TV system shown in FIG. 1B, when the broadcast signal is an uplink signal transmitted from the TV receiver of the subscriber 180 to the HEAD END 150 via the distributor 170 and the bidirectional amplifier 160, the service is performed. As unidirectional cable TV networks evolved to bidirectional cable TV for bidirectional services, such as area noise in proportion to area, various noise problems have occurred.

Meanwhile, an optical coaxial mixed network is composed of an optical fiber (or optical cable) and a coaxial cable, and uses optical fibers to broadcast stations (or head ends) and optical network units (ONUs). The subscriber station (or home terminal) refers to a broadband transmission network that can transmit data signals, such as the Internet, cable TV, crime prevention, disaster prevention, remote meter reading, and automatic control using coaxial cable.

The optical coaxial mixed network can theoretically support a wide transmission band that can be connected at a transmission rate of 9600bps to 30Mbps per channel of 6MHz bandwidth.

2 is a diagram showing the overall network configuration in a conventional optical coaxial mixed network.

According to the overall network configuration of the conventional optical coaxial mixing network shown in FIG. 2, the optical coaxial mixing network is a CATV (cable TV system) installed in a broadcasting station (or HEAD END) 210, and an optical transmitter (OTX). , Video on demand (VOD), Internet, VoIP G / K (Internet Telephony Gatekeeper), and a plurality of terminals such as a TV, a PC, a telephone, and an air conditioner installed in the subscriber terminal (or home terminal) 250. Can be. In addition, an optical fiber (or an optical cable) 220, an optical network unit (ONU) 230, and the interval between the broadcasting station (or HEAD END) 210 and the subscriber end (or indoor terminal) 250. Coaxial cable 240 may be installed.

Accordingly, the present invention improves the conventional optical coaxial mixing network including an optical cable resistant to external noise and having a much longer distance than copper wire without having an amplifier in the middle due to the reduced amount of light. By minimizing noise problem in TV system and providing interactive service, we propose new technology to provide VOD service to subscriber.

The present invention has been made to solve the above problems, in a two-way cable TV system providing a VOD service, by minimizing the noise according to the uplink signal path from the subscriber to the broadcast station, and achieves the bidirectional service, VOD to the subscriber An object of the present invention is to provide a system and method for providing a VOD service using an optical coaxial mixed network for providing a service.

Another object of the present invention is to provide a system and method for providing a VOD service using an optical coaxial mixed network that provides a VOD service regardless of analog or digital.

In addition, an object of the present invention is to provide a system and method for providing a VOD service using an optical coaxial mixing network, which is inexpensive to replace with a new equipment because the existing broadcasting equipment can be used as it is.

In order to achieve the object of the present invention as described above, the VOD service providing system according to the present invention recognizes the VOD broadcast signal corresponding to the channel selected by the subscriber in the VOD broadcast server, and is recognized from the VOD broadcast server to the indoor terminal VOD broadcast transmission means for transmitting a VOD broadcast signal through an optical coaxial mixed network, environmental determination means for determining a transmission environment according to a medium in the optical coaxial mixed network to which the VOD broadcast signal is transmitted, and the determined transmission environment. Correspondingly, it comprises a media converter for signal conversion of the VOD broadcast signal.

In addition, as a technical method according to the present invention, in the VOD service providing method, a VOD broadcast signal corresponding to a channel selected by a subscriber is recognized by a VOD broadcast server, and the recognized VOD broadcast signal is transmitted from the VOD broadcast server to an indoor terminal. Determining a transmission environment according to a medium in the optical coaxial mixed network to which the VOD broadcast signal is transmitted, and transmitting the VOD broadcast signal in correspondence to the determined transmission environment. It characterized in that it comprises a step of switching.

Hereinafter, a VOD service providing system according to the present invention will be described with reference to the accompanying drawings.

3 is a diagram illustrating signal processing of a VOD service providing system of the present invention for providing a VOD broadcast signal corresponding to VOD request information.

The HEAD END 310 generally receives terrestrial or satellite television broadcast programs and transmits them through a coaxial cable or an optical cable, or cable a program supplied by a cable TV (CATV) broadcasting company or a program supplied by a program supplier. It may be a device for sending out.

In particular, HEAD END 310 in the present specification is a VOD broadcast of a comprehensive wired broadcasting station to provide a predetermined VOD broadcast signal to the indoor terminal through the optical coaxial network under the control of the VOD service providing system 300 of the present invention. It can be a server.

According to the present invention, the HEAD END 310 receives the VOD broadcast signal request information from the subscriber using the CLC modem 340 to the HFC network (Hybrid-Fiber Coaxial, 320) and the VOD service providing system 300 that is an optical coaxial mixed network. Can be input via In addition, the HEAD END 310 transmits a VOD broadcast signal through the HFC network 320 via the VOD service providing system 300 in response to the inputted VOD broadcast signal request information, such as a video (TV) ( 330 may be transmitted.

According to the transmission of the VOD broadcast signal, the VOD service providing system 300 may provide an optimal VOD broadcast by reflecting various selections and requests of subscribers.

4 is a diagram illustrating in detail the configuration of a VOD service providing system according to the present invention.

As shown in FIG. 4, the VOD service providing system 400 includes a VOD broadcast transmission means 410, an environment determination means 420, a media converter 425, a CLC modem 430, and a channel change control means 440. It is composed of

The VOD broadcast transmitting unit 410 recognizes a VOD broadcast signal corresponding to a channel selected by the subscriber in a VOD broadcast server, for example, the HEAD END 310 described above, and the recognized VOD broadcast signal is transmitted from the VOD broadcast server to the indoor terminal. It serves to be transmitted through optical coaxial mixed network.

For example, when the subscriber selects channel 30 on which the movie 'monster' is being broadcast, the VOD broadcast transmission means 410 in the VOD service providing system 400 may use the optical coaxial mixing network from the VOD broadcasting server to the subscriber's TV. It transmits the VOD broadcasting signal of the movie 'monster' to the band corresponding to channel 30.

The environmental determining unit 420 determines a transmission environment according to a medium in the optical coaxial mixed network through which the VOD broadcast signal is transmitted, that is, a cable type. That is, when the VOD broadcast signal is transmitted under the control of the VOD broadcast transmission means 410, the environment determination means 420 switches the medium through which the VOD broadcast signal is transmitted (optical cable and coaxial cable of an optical coaxial mixed network). To adjust the transmission environment so that the VOD broadcast signal can be transmitted in an optimal environment.

The media converter 425 serves to switch the VOD broadcast signal corresponding to the transmission environment determined by the environment determining means 420. That is, the media converter 425 may optical-field convert the VOD broadcast signal between heterogeneous media in the optical coaxial mixed network. For example, the media converter 425 performs signal conversion of the VOD broadcast signal corresponding to the transmission environment determined according to the optical cable and the coaxial cable switching of the optical coaxial mixed network.

The CLC modem 430 plays a role of visualizing the VOD broadcast signal in the indoor terminal corresponding to the determined transmission environment. That is, the CLC modem 430 demodulates the VOD broadcast signal in consideration of the modulation form of the VOD broadcast signal at the time when it is transmitted from the VOD broadcast transmission means 410, and decodes the demodulated VOD broadcast signal. The display means is used to display on the indoor terminal.

The channel change control means 440 identifies the second VOD broadcast signal in the VOD broadcast server corresponding to the channel change signal received from the indoor terminal.

In this case, the VOD broadcast transmission means 410 may allow the identified second VOD broadcast signal to be transmitted through the optical coaxial mixed network instead of the existing VOD broadcast signal being transmitted through the optical coaxial mixed network. .

The channel change signal according to the present invention may be signal data generated when a subscriber watching a VOD broadcast through a home terminal changes a channel. In addition, the channel change signal includes a setup box (STB) connected to a predetermined display so that viewers, such as broadcast response quizzes and questionnaires, can participate in the broadcast directly or purchase goods easily from the home shopping channel. It may include various control signals transmitted from the terminal to the VOD service providing system 400 of the present invention.

Hereinafter, the workflow of the VOD service providing system according to an embodiment of the present invention will be described in detail.

5 is a flowchart illustrating a method of providing a VOD service according to an embodiment of the present invention in detail.

The VOD broadcast transmission means 410 in the VOD service providing system 400 recognizes a VOD broadcast signal corresponding to a channel selected by the subscriber in the VOD broadcast server in step 510, and from the VOD broadcast server in step 520. The indoor terminal controls the recognized VOD broadcast signal to be transmitted through an optical coaxial mixed network.

The environment determining means 420 in the VOD service providing system 400 switches the transmission environment according to the medium (type of cable) in the optical coaxial mixed network in which the VOD broadcast signal is transmitted in step 530. For example, the media converter 420 may convert the VOD broadcast signal when the VOD broadcast signal transmitted from the VOD broadcast server through the optical cable of the optical coaxial mixed network is switched to the coaxial cable through the optical network unit. It is possible to determine the transmission environment so that can be transmitted in the optimum conditions in the coaxial cable.

In this case, the media converter 425 serves to switch the VOD broadcast signal corresponding to the transmission environment determined by the environment determination means 420. That is, the media converter 425 may optical-field convert the VOD broadcast signal between heterogeneous media in the optical coaxial mixed network. For example, the media converter 425 performs signal conversion of the VOD broadcast signal corresponding to the transmission environment determined according to the optical cable and the coaxial cable switching of the optical coaxial mixed network.

The CLC modem 430 in the VOD service providing system 400 causes the VOD broadcast signal to be visualized in the indoor terminal in accordance with the transmission environment determined in step 530 (step 540).

At this time, in step 540, the CLC modem 430 may demodulate the VOD broadcast signal in consideration of the modulation form of the VOD broadcast signal when the VOD broadcast transmission means is transmitted.

In addition, in step 540, the CLC modem 430 may display the demodulated VOD broadcast signal on the indoor terminal using a predetermined display means.

Subsequently, the channel change control means 440 in the VOD service providing system 400 receives a second VOD broadcast server from the VOD broadcast server in response to the channel change signal received from the indoor terminal while the VOD broadcast signal is received at the indoor terminal. It may be necessary to identify the VOD broadcast signal.

In this case, the VOD broadcast transmission means may allow the identified second VOD broadcast signal to be newly transmitted through the optical coaxial mixed network instead of the existing VOD broadcast signal being transmitted through the optical coaxial mixed network.

For example, when the channel 'monster' selects channel 30 for broadcasting and the subscriber watching the channel changes to channel 40 for broadcasting the movie 'King Kong', the channel change control means 440 may include an optical coaxial mixed network. It can receive the channel change signal transmitted through. In addition, the channel change control unit 440 transmits the input channel change signal to the VOD broadcast server, and identifies the VOD broadcast signal 'King Kong' corresponding to the channel 40 from the VOD broadcast server. Subsequently, the VOD broadcast transmission means 410 transmits the identified VOD broadcast signal 'King Kong' to the band corresponding to channel 40 through the optical coaxial network so that the movie 'King Kong' is replaced with the movie 'Monster' to the subscriber. Can be changed and service provided.

6 is a detailed configuration diagram of a system for providing a VOD broadcast signal and a non-VOD broadcast signal according to an embodiment of the present invention.

In FIG. 6, the VOD broadcast server 610 provides a VOD broadcast signal to an indoor terminal through an optical coaxial mixed network via the VOD service providing system 600 of the present invention, for example, a HEAD END 310 which is a comprehensive wired broadcasting station. May be referred to.

The non-VOD broadcast server 620, in conjunction with the reception of the channel change signal from the subscriber in the channel change control means 440 in the VOD service providing system 600 of the present invention, the VOD service non-VOD broadcast to the VOD service providing system 600 May provide a signal. The provided VOD non-broadcast signal may be transmitted to the indoor terminal 670 through the optical coaxial mixing network by the control of the channel change control means 440.

The non-VOD broadcast signal may be information related to a VOD broadcast service, for example, information about a subtitle displayed on a display means of a domestic terminal, or may be a control signal including various other information related to a VOD service being broadcast.

According to an embodiment of the present invention, the VOD service providing system 600 for providing a VOD broadcast signal through an optical coaxial mixed network, as shown in FIG. 6, an optical communication network unit (ONU) 630 of an optical coaxial mixed network. It can be included and installed. The optical network unit 630 according to an example of the present invention may include an environment determining means 640, a media converter 645, and a CLC modem 650, and the optical network unit 630 may include a VOD broadcast signal. The determination means 640, the media converter 645, and the CLC modem 650 may be transmitted to the indoor terminal.

In addition, as shown in FIG. 6, the VOD non-broadcast signal is received from the VOD non-broadcast server 620 through an optical cable of an optical coaxial mixed network to an optical receiver (ORX: Optical Receiver) of the optical communication network unit 630. Amplified by the downlink amplifier, it may be transmitted to the CLC STB 660, which is a set-top box connected to the indoor terminal 670 through a coaxial cable.

7 is a configuration diagram of a VOD service providing system for providing a non-VOD broadcast signal according to an embodiment of the present invention.

As shown in the figure, the VOD service providing system 700 may be composed of a VOD non-broadcast signal transmission means 710, an environment determination means 720, a media converter 725, and a CLC modem 730.

The VOD non-broadcast signal transmitting unit 710 recognizes the VOD non-broadcast signal corresponding to the channel changed by the subscriber in the non-VOD broadcast server, and the recognized VOD non-broadcast signal from the non-VOD broadcast server to the indoor terminal is optical coaxial. It serves to be transmitted through the mixed network.

The environmental determining unit 720 determines a transmission environment according to a medium in the optical coaxial mixed network to which the non-VOD broadcast signal is transmitted, that is, a cable type. That is, when the VOD non-broadcast signal is transmitted under the control of the VOD non-broadcast signal transmitting unit 710, the environment determining unit 720 switches the medium on which the non-VOD non-broadcast signal is transmitted (optical coaxial mixed network). Cable and coaxial cable switching) to adjust the transmission environment such that the non-VOD signal can be transmitted in an optimal environment.

The media converter 725 serves to switch the non-VOD signal in correspondence with the transmission environment determined by the environment determining means 720. That is, the media converter 725 may optical-field convert the non-VOD signal between heterogeneous media in the optical coaxial mixed network. For example, the media converter 725 performs signal conversion of the VOD broadcast signal corresponding to the transmission environment determined according to the optical cable and the coaxial cable switching of the optical coaxial mixed network.

The CLC modem 730 demodulates the non-VOD broadcast signal received from the non-VOD broadcast server according to the determined transmission environment.

8 is a flowchart illustrating a method of providing a signal other than a VOD broadcast according to an embodiment of the present invention in detail.

The VOD non-broadcast signal transmitting means 710 in the VOD service providing system 700 recognizes a non-VOD broadcast signal corresponding to a channel changed by the subscriber in step 810, and then moves in-house from the non-VOD broadcast server in step 820. The terminal controls the perceived non-VOD signal to be transmitted through the optical coaxial mixed network.

When the VOD non-broadcast signal is transmitted through the optical coaxial mixed network in step 830, the media converter 720 switches the transmission environment according to the transmitted medium or cable type. For example, the environmental determination means 720 of the VOD service providing system 700 according to the present invention transmits the non-VOD broadcast signal transmitted through the optical cable of the optical coaxial mixed network from the non-VOD broadcast server to the coaxial cable. When the medium is switched, it is possible to determine the transmission environment so that the signal other than the VOD broadcast can be transmitted.

In addition, the media converter 725 plays a role of signal conversion of the non-VOD broadcast signal corresponding to the transmission environment determined by the environment determination means 720. That is, the media converter 725 may optical-field convert the non-VOD signal between heterogeneous media in the optical coaxial mixed network.

As the non-VOD broadcast signal is converted by the media converter 725 in correspondence with the transmission environment determined by the environment determining means 720 in accordance with the switching of the transmission medium in step 830, the CLC modem 730 receives the VOD. In operation 840, demodulation is performed in response to a modulation form of the VOD non-broadcast signal received from the non-broadcast server.

For example, the CLC modem 430 demodulates in response to the modulation form of the non-VOD broadcast signal received from the non-VOD broadcast server, and the demodulated VOD non-broadcast signal using the predetermined display means in the home terminal. It can be visualized by having it displayed.

9 is a flowchart illustrating a procedure of a VOD service providing method according to an embodiment of the present invention.

In operation 910, the VOD service providing system 700 receives a signal regarding channel selection from a subscriber.

In operation 920, the VOD service providing system 700 transmits a channel change signal corresponding to the selected channel to the non-VOD broadcasting server 620 through an optical coaxial mixed network.

In operation 930, the VOD service providing system 700 controls the channel change signal received by the server other than the VOD broadcast 620 to be transmitted to the VOD broadcast server 610.

In operation 940, the VOD service providing system 700 allows the VOD broadcast signal to be transmitted from the VOD broadcast server to the indoor terminal 670 through the optical coaxial mixed network according to the received channel change signal.

In operation 950, the VOD service providing system 700 transmits channel information about the selected channel from the VOD broadcast server 610 to the non-VOD broadcast server 620 according to the received channel change signal.

In operation 960, the VOD service providing system 700 transmits a non-VOD broadcast signal corresponding to the transmitted channel information from the non-VOD broadcast server 620 to the indoor terminal 670 through the optical coaxial mixing network.

At this time, the environmental determination unit 640 determines the transmission environment as the medium for the non-VOD broadcast signal is transmitted, that is, the cable type is switched from the optical cable to the coaxial cable.

In addition, the media converter 725 signals the VOD non-broadcast signal corresponding to the transmission environment determined by the environment determining means 720.

In addition, the CLC modem 650 allows the non-VOD broadcast signal to be visualized in the indoor terminal 670 corresponding to the determined transmission environment.

In operation 970, the VOD service providing system 700 causes the received VOD broadcast signal and the non-VOD broadcast signal to be displayed on the indoor terminal 670.

In addition, embodiments of the present invention include computer-readable media containing program instructions for performing various computer-implemented operations. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The medium or program instructions may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine code, such as produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter.

While specific embodiments of the present invention have been described so far, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by those equivalent to the claims.

As can be seen from the above description, according to the present invention, in a two-way cable TV system providing a VOD service, by minimizing the noise according to the uplink signal path from the subscriber to the broadcast station, and achieves the two-way service, the VOD service to the subscriber Can be provided.

In addition, according to the present invention, it is possible to provide a VOD service regardless of analog or digital.

In addition, according to the present invention, since the existing broadcast equipment can be used as it is, the cost required to replace the new equipment can be less.

Claims (17)

In the VOD service providing system, VOD broadcast transmission means for recognizing a VOD broadcast signal corresponding to a channel selected by the subscriber in a VOD broadcast server, and transmitting the recognized VOD broadcast signal from the VOD broadcast server to an indoor terminal through an optical coaxial mixed network; The VOD non-broadcast signal corresponding to the channel is recognized by a non-VOD broadcast server, and the recognized VOD non-broadcast signal from the non-VOD broadcast server to the indoor terminal is transmitted through the optical coaxial mixed network. Transmission means; Environmental determination means for determining a transmission environment for the VOD broadcast signal and the non-VOD broadcast signal in accordance with the change of a medium in the optical coaxial mixed network; And A media converter for signal switching between the VOD broadcast signal and the non-VOD broadcast signal corresponding to the determined transmission environment VOD service providing system comprising a. The method of claim 1, The media converter, And a system for optical-field conversion between the VOD broadcast signal and the non-VOD broadcast signal between heterogeneous media in the optical coaxial mixed network. The method of claim 1, A coaxial line communication (CLC) modem for visualizing the VOD broadcast signal and the non-VOD broadcast signal in the indoor terminal according to the determined transmission environment. VOD service providing system, characterized in that it further comprises. The method of claim 3, The CLC modem, And the demodulation mode for the VOD broadcast signal and the non-VOD broadcast signal, and demodulate the VOD broadcast signal and the non-VOD broadcast signal. The method of claim 4, wherein The CLC modem, And visualize the demodulated VOD broadcast signal and the demodulated VOD broadcast signal by displaying them in the indoor terminal using a predetermined display means. The method of claim 1, And channel change control means for identifying a second VOD broadcast signal in a VOD broadcast server corresponding to the channel change signal received from the indoor terminal. The VOD broadcast transmission means, And the identified second VOD broadcast signal is transmitted through the optical coaxial mixed network in place of the VOD broadcast signal being transmitted through the optical coaxial mixed network. delete delete delete In the VOD service providing method, Recognizing a VOD broadcast signal corresponding to a channel selected by a subscriber in a VOD broadcast server, and transmitting the recognized VOD broadcast signal from the VOD broadcast server to an indoor terminal through an optical coaxial mixed network; Recognizing the VOD non-broadcast signal corresponding to the channel in a non-VOD broadcast server and transmitting the recognized VOD non-broadcast signal from the non-VOD broadcast server to the indoor terminal through the optical coaxial mixing network; Determining a transmission environment for the VOD broadcast signal and the non-VOD broadcast signal according to a medium change in the optical coaxial mixed network; And Signal-switching the VOD broadcast signal and the non-VOD broadcast signal corresponding to the determined transmission environment VOD service providing method comprising a. The method of claim 10, In response to the determined transmission environment, the step of signal switching the VOD broadcast signal and the non-VOD broadcast signal, Optical-field conversion of the VOD broadcast signal and the non-VOD broadcast signal between heterogeneous media in the optical coaxial mixed network; VOD service providing method comprising a. The method of claim 10, Allowing the VOD broadcast signal and the non-VOD broadcast signal to be visualized in the indoor terminal according to the determined transmission environment. Method of providing a VOD service further comprising a. The method of claim 12, In response to the determined transmission environment, the VOD broadcast signal and the non-VOD broadcast signal may be visualized in the indoor terminal. Demodulating the VOD broadcast signal and the non-VOD broadcast signal in consideration of a modulation form of the VOD broadcast signal and the non-VOD broadcast signal; VOD service providing method comprising a. The method of claim 13, In response to the determined transmission environment, the VOD broadcast signal and the non-VOD broadcast signal may be visualized in the indoor terminal. And demodulating the demodulated VOD broadcast signal and the demodulated VOD broadcast signal by displaying the demodulated VOD broadcast signal on the indoor terminal using a predetermined display means. The method of claim 10, Identifying a second VOD broadcast signal in a VOD broadcast server corresponding to the channel change signal received from the indoor terminal; The step of allowing the VOD broadcast signal to be transmitted through the optical coaxial mixed network, Allowing the identified second VOD broadcast signal to be transmitted through the optical coaxial mixed network in place of the VOD broadcast signal being transmitted through the optical coaxial mixed network. VOD service providing method comprising a. delete A computer-readable recording medium having recorded thereon a program for performing the method of claim 10.

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