KR0174405B1 - Structure of low price video network accepting video on demand service - Google Patents

Abstract

The present invention is multiplexed to 155.520Mb / s after digital switching in the video network, and the multiplexed data is transmitted through the optical transmission to broadcast TV programs, video-on-demand video services, and telephone network services by using an extra telephone line in a telephone box near the subscriber. The purpose is to provide a low-cost video network structure that can be provided.

In order to achieve the above object, the present invention provides a video distribution center (3) capable of providing broadcast TV programs and video-on-demand services, optical terminators converting optical signals into electrical signals and having a plurality of high frequency modulation / demodulation devices ( 4) and a subscriber access network (5) located at the end of the subscriber access network that can provide services through the telephone line and interworking with a telephone, an ISDN terminal, and a TV receiver.

Description

Low-cost video network architecture accommodates on-demand video services

1 is an overall configuration diagram of a video network according to the present invention.

2 is a system structural diagram of the present invention for processing a telephone and narrowband comprehensive information service.

3 is a system structural diagram of the present invention for processing a broadcast type TV program.

4 is a schematic diagram of the present invention for processing an on-demand video program service.

5 is a schematic diagram of the present invention for processing on-demand video program registration.

* Explanation of symbols for main parts of the drawings

1: Telephone network (PSTN) 2: Head and

3: image distribution device 4: optical termination device

5: subscriber premises equipment

The present invention relates to a low-cost video network system capable of providing on-demand video programs and broadcast-type TV programs required by viewing menus displayed on a TV receiver in a subscriber premises.

The analog coaxial CATV system was not only able to provide on-demand video programs, but also could not provide other digital services due to the absence of uplink channels or limited speed. There is not yet a technology that adopts a method of providing a video in a subscriber's premises using a telephone line in the premises after transmission.

Thus, the present invention is multiplexed to 155.520 Mb / s after digital switching in the video network, and the multiplexed data is broadcast-programmed, video-on-demand service and telephone network by using an extra telephone line in a telephone box near the subscriber via optical transmission. The purpose is to provide a low-cost video network structure that can provide services.

In order to achieve the above object, the present invention provides an image distribution center capable of providing a broadcast TV program and a video-on-demand service, an optical terminal that converts an optical signal into an electrical signal and has a plurality of high frequency modulation / demodulation devices, and From this point, the subscriber access network capable of providing a service through a telephone line and the subscriber premises device located at the end of the subscriber access network have a configuration for interworking with a telephone, an ISDN terminal, and a TV receiver.

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

1 is an overall structural diagram of a video network according to the present invention.

As shown in the figure, the network according to the present invention is connected to the telephone network 1 and the head-end 2, receives telephone service, narrowband comprehensive information service and TV broadcast service information, and distributes the information to the desired subscribers. An image distribution center (3) which embeds a plurality of video programs and provides them according to a request signal from a subscriber, an optical terminator (4) connected to the image distribution center via an optical cable to perform an interface with a subscriber side; A subscriber premises device connected to the optical terminator 4 through a telephone line to supply corresponding service information to an ISDN terminal, a telephone and a TV receiver in a subscriber's home, and to transmit a service request signal of the subscriber side to the optical terminator 4 side ( 5) was provided.

In addition, the video distribution center 3 uses a PSTN / ISDN matching unit 31 for interfacing a telephone and narrowband comprehensive information service with the telephone network 1, and a network synchronizer clock through the PSTN / ISDN matching unit 31. A network synchronizer 32 for generating and providing a system clock, a communication channel mapper / demapper 33 for mapping / demapping a signal exchanged with the PSTN / ISDN matching unit 31, and the communication channel The communication multiplexer (MUX) 310 for multiplexing and outputting information through the mapper / demapper 33 and the communication channel information from the subscriber side are demultiplexed and provided to the communication channel mapper / demapper 33. 2.5 Gbps for receiving and outputting a communication channel demultiplexer (DMX) 39 and a TV signal and a video program signal from the head end 2 and transmitting a new program registration signal at the subscriber side to the head end 2. Request for new program registration on the optical transmission device 34 and subscriber side Network management and maintenance device 36 for receiving and transmitting to the 2.5Gbps optical transmission device 34, and the transmission DMX 35 for demultiplexing and outputting the output from the 2.5Gbps optical transmission device 34 And a video server 37 which receives and stores video program information during output of the transmission DMX 35, and provides TV signals 1 to k and outputs the video server during output of the transmission DMX 35. A multiplexing switch 314 for switching and transmitting the video signals 1 to L of the video signal 37, and communication information from the communication MUX 310 and video information from the space dividing switch 314 are multiplexed and outputted. A plurality of channel MUX 311, a plurality of channel DMX 312 for demultiplexing the communication information of the subscriber side to the communication DMX 39, and converts the output of the channel MUX 311 to an optical signal Electrical communication of optical communication information from the subscriber side to the subscriber side through the optical cable Control the plurality of 155 Mbps optical transmitters 313, the communication channel mapper / demapper 33, the video server 37, and the spatial partition switch 314, which are converted to the channel DMX 312 and transmitted to the channel DMX 312. The control device provides a communication operation signal to the subscriber to the communication MUX 310 and receives a new program request signal from the subscriber through the communication DMX 39 and provides the signal to the network management and maintenance device 36. 38 is provided.

Further, each optical terminator 4 is a 155 Mbps optical transmitter 41 in the optical terminator 1 (4) which communicates one-to-one with the 155M optical transmitter 313 in the image distribution center 3 via an optical cable. ), A channel DMX 42 for demultiplexing and outputting a signal output from the 155M optical transmitter 41, and an output signal of the channel DMX 42 for high frequency modulation to be output to a subscriber's telephone line, A plurality of high frequency demodulation / demodulation devices 44 for demodulating and outputting a signal from the plurality of signals, and a channel MUX for multiplexing the subscriber side signals through the high frequency modulation / demodulation device 44 and outputting them to the 155M optical transmission device 41. 43 is provided.

In addition, each subscriber premises 5 is connected one-to-one with the high frequency modulation / demodulation device 51 in the optical terminator 4 through a telephone line to demodulate and provide a signal from the optical terminator 4 side. And a channel matching interface for interfacing a signal between the high frequency modulation / demodulation device 51 which modulates the signal of the subscriber side and transmits it to the optical terminator 4, and the telephone and ISDN terminal of the subscriber. And a set top 53 for modulating the digital program data demodulated by the high frequency modulation / demodulation device 51 into an analog signal of an NTSC signal and providing it to a subscriber's TV receiver.

On the other hand, in the network according to the present invention, the 155 Mbps optical transmission devices 313 in the image distribution center 3 are connected to the 155 Mbps optical transmission devices 41 in the optical terminator 4 by one-to-one optical cable to M pieces. In the optical terminator 4, up to N subscriber premises devices are connected by one-to-one telephone line. Accordingly, the video distribution center 3 may expand the subscriber premises 5 to MN (MxN).

Here, the video distribution center 3 is located in the telephone company, and remotely installs up to M optical terminators 4 remotely with optical cables, and the power required by the optical terminators 4 is a power supply device of the video distribution center. At 315 is supplied to the power conversion device 45 of the optical terminator 4 directly with the optical cable. The optical terminal 4 is located near the subscriber's single or multi-unit residential area, and is directly connected to the subscriber's home device 5 located at a short distance by a telephone line from the high frequency modulator / demodulator 44 within the optical terminal 4. It is possible to simultaneously receive narrowband comprehensive information service (ISDN), and through TV receiver, select one program among K broadcast TV program K program and receive reception service or on-demand provided by video server 37. One program from among L video programs can be selected to receive a reception service.

The present invention for processing such services by type will be described in detail with reference to FIGS. 2 to 5 for each system structure processing the corresponding service.

2 is a system structural diagram of the present invention for simultaneously processing a telephone and narrowband comprehensive information service.

The service channels (hereinafter referred to as communication channels) received from the telephone network 1 located in the same telephone company to the Public Services Telecommunication Network (PSTN) / Integrated Services Data Network (ISDN) matching unit 31 are referred to as communication channel mapper / D. Mapper 33 is delivered to the device. The communication channels are semi-permanently exchanged and connected to the subscriber indoor device 5 of the corresponding subscriber upon receiving the command of the control device 38, and through the output of the communication channel mapper / demapper 33, the communication multiplexing (MUX) device 310 Is entered. The communication MUX device 310 serves to multiplex a communication channel together with a request signal for selecting a broadcast TV or an on-demand video program. The channel MUX device 311 is a device that multiplexes the video data of the switched program and the signal output from the communication MUX device 310.

The communication DMX (demultiplexing) device 39 has a demultiplexing function that performs the reverse function of the communication MUX device 310, and the channel DMX 312 has a demultiplexing function that performs the opposite function of the channel MUX 311. Have When the communication channel for the telephone and narrowband integrated information service output from the communication MUX 310 is input to the channel MUX 311, and the output of the channel MUX 311 is transmitted to the 155M optical transmitter 311, an electrical signal is transmitted to the optical signal. Is converted to. The communication channel converted to the optical signal is transmitted to the 155M optical transmission device 41 in the optical terminal 4 via the optical cable.

The communication channel shown at the output end of the 155M optical transmission of the optical terminator 4 is demultiplexed in the channel DMX 42, and the demultiplexed communication channel is modulated with an analog signal by the digital data in the high frequency modulation / demodulation device 44, thereby providing a general telephone line. It is delivered to the subscriber premises (5) through.

The high frequency modulation / demodulation device 51 of the subscriber indoor device 5 demodulates the analog signal through the telephone line into digital data and outputs it to the channel matching device 52. Here, the communication channel input to the channel matching device 52 is divided into a telephone channel and a narrowband synthesis information channel, and the separated channels are respectively input to the telephone and the ISDN terminal.

The channels output from the telephone and the ISDN terminal are inputted back to the channel matching device 52, and the digital data merged into the communication channel is modulated into an analog signal by the high frequency modulator / demodulator 51. The communication channel modulated with the analog signal is transmitted to the high frequency modulator / demodulator 44 of the optical terminator 4 via a telephone line. Here again, the communication channel of the analog signal is converted into digital data, input to the channel MUX device 43, and multiplexed. In the multiplexed communication channel, the electrical digital data is transmitted from the 155M optical transmission device 41 to the video distribution center 3 via the optical cable as a digital optical signal.

The communication channel converted into an electrical signal by the 155M optical transmission device 313 of the image distribution center 3 is input to the communication channel mapper / demufer 33 via the channel DMX 312 and the communication DMX 39. In this case, in order to confirm that the corresponding subscriber is transmitted as an HDB3 signal through the PSTN / ISDN matching unit 31 according to a confirmation command of the control unit 38, it is inputted to an electronic switchboard (not shown) of the telephone network 1. .

FIG. 3 is a system diagram of the present invention in which a TV program is serviced when a subscriber home apparatus views a menu of a TV receiver and selects a channel to watch from K broadcast TV programs.

When a subscriber applies for a channel of a broadcast type TV program to be watched, the set top 53 transmits a program selection signal (hereinafter referred to as a request signal) to the high frequency modulation / demodulation device 51, and the high frequency modulation / demodulation device. In 51, digital data is modulated into an analog signal and then transmitted to the optical terminator 4 via a telephone line. The analog request signal received by the optical terminator 4 is demodulated back into digital data by the high frequency modulation / demodulation device 44, multiplexed together with the communication channel described above by the channel MUX device 43, and sent to the 155M optical transmission device 41. Is entered. The electrical request signal is then converted into an optical signal and input to the 155M optical transmission device 313 of the image distribution center 3 via the optical cable.

The request signal input to the 155M optical transmission device 313 of the image distribution center 3 as an optical signal is converted into an electrical signal and transmitted to the channel DMX 312. In the channel DMX device 312, the communication channel and the request signal are demultiplexed and input to the communication DMX 39. The input communication channel and the request signal are separated from each other while being demultiplexed in the communication DMX device 39. The separated request signal is transmitted to the control device 39, and the control device 38 transmits a command to the space division switch device 314 to switch the broadcast type TV program requested by the subscriber. At this time, K broadcast programs are multiplexed and received from the head-end device 2 through the 2.5G optical transmission device 34, and are demultiplexed by the transmission DMX device 35 and input to the space division switch 314. The program according to the request command requested by the subscriber among the K programs is switched to the corresponding output terminal of the space division switch 314. Therefore, the switched TV program is multiplexed together with the communication channel in the channel MUX 311 device, and the multiplexed TV program is converted into an optical signal by the 155M optical transmission device 313 to the optical terminator 4 through the optical cable. Is sent.

The program input to the 155M optical transmission device 41 of the optical terminator 4 is converted into an electrical signal, the converted subscriber request TV program is demultiplexed in the channel DMX 42 device, and the demultiplexed program is a high frequency modulation / demodulation. Device 44 is modulated from digital data to analog signal. The modulated TV program is delivered to the subscriber premises 5 via the telephone line, and the selected TV program is demodulated back into digital data in the high frequency modulation / demodulation device 51 of the subscriber premises. The digital data of the demodulated program is transmitted from the digital data in the set top device 53 to the analog signal of the NTSC signal and then transmitted to the TV receiver. Eventually, the subscriber can watch the broadcast-type TV program.

4 is a system structure diagram of the present invention in which a video program is serviced when a subscriber home apparatus 5 views a menu of a TV receiver and selects a channel to be watched from among L video programs L stored in the video server 37.

When a subscriber applies for a channel of an on-demand video program to be watched, a program selection signal (hereinafter referred to as a request signal) is set on the set top 53 and then modulated from digital data to an analog signal by the high frequency modulation / demodulation device 51. It is transmitted to the optical terminal 4 through the telephone line. The analog request signal received by the optical terminator 4 is demodulated back into digital data by the high frequency modulation / demodulation device 44, multiplexed together with the communication channel described above by the channel MUX device 43, and sent to the 155M optical transmission device 41. Is entered. The electrical request signal is converted into an optical signal and input to the 155M optical transmission device 313 of the image distribution center 3 through the optical cable.

The request signal input to the 155M optical transmission device 313 of the image distribution center 3 as an optical signal is converted into an electrical signal and transmitted to the channel DMX 312. In the channel DMX device 312, the communication channel and the request signal are demultiplexed and input to the communication DMX 39. The input communication channel and the request signal are separated from each other while being demultiplexed in the communication DMX device 39. The separated request signal is transmitted to the control unit 38, and the control unit 38 transmits a command to the space division switch unit 314 to switch the on-demand video program requested by the subscriber, and simultaneously to the video server 37. Pass the command.

At this time, the L video programs stored in the video server 37 are input to the space division switch 314. Among the video programs, the video program is switched to the corresponding output terminal of the space division switch 314 according to a request command requested by the subscriber.

The switched on-demand video program is multiplexed together with the communication channel in the channel MUX device 311, and the multiplexed on-demand video program is converted from the electrical signal to the optical signal in the 155M optical transmission device 313 and is connected to the optical terminal 4 through the optical cable. Is sent to.

On-demand video programs input to the 155M optical transmission device 41 of the optical terminator 4 are converted into electrical signals, and video programs converted to digital data requested by the subscriber are demultiplexed and demultiplexed in the channel DMX device 42. The programmed program is modulated from the digital data into an analog signal through the high frequency modulator / demodulator 44. The modulated TV program is delivered to the subscriber premises 5 via a telephone line, and the selected on-demand video program is demodulated back into digital data in the high frequency modulator / demodulator 51 of the subscriber premises 5.

The demodulated program is modulated from digital data to an analog signal of NTSC signal in the set-top device 53 and then transferred to the TV receiver, so that the subscriber can watch the video program on demand.

5 is a program registration system structure diagram of the present invention for storing a new on-demand video program in the video server 37. As shown in FIG.

When the request signal of the subscriber is input to the control device 38, the control device 38 notifies the network management and maintenance device 36, and the network management and maintenance device 36 sends the 2.5G optical transmitter 34 to it. The new program data is notified to the head end 2 through the head end 2, and when the new program data is input from the head end 2 to the 2.5G optical transmission device 34 of the image distribution center 3 as an optical signal, the transmission DMX device 35 Is delivered. The newly registered on-demand video program is stored in the video server 37 after demultiplexing in the transmitting DMX device 35.

The new on-demand video program stored in the video server 37 communicates with the control device 38 to transmit and receive information such as a storage location, a broadcast time length and type of the program, and the registration is completed. The registered on-demand video program serves to readjust the program menu in the control unit 38 to guide the subscriber premises 5.

Therefore, the re-adjusted menu is stored in the video server 37 that was originally recorded and a new menu is provided to the subscriber premises 5 when necessary, so that subscribers can receive the newly registered on-demand video program.

Therefore, the present invention configured and operated as described above can provide subscribers with broadcast TV programs and on-demand video programs as opposed to the method of serving only broadcast-type TV programs in comprehensive cable broadcasting, and also provides telephone and narrowband services. As a video network capable of simultaneously providing comprehensive information services, it is easy to design a network of an outside plant and has an effect of establishing a service network at low cost. In addition, in the integrated cable system, the use of a tree and branch coaxial cable makes it difficult to wire the premises line due to the convergence noise of the upstream channel, but the present invention has the effect of using an existing telephone line as it is. It also has the advantage of eliminating the cost of premises lines.

Claims (8)

It is connected to the telephone network 1 and the head end device 2 and receives telephone service, narrowband comprehensive information service and TV broadcasting service information and distributes the information to the desired subscribers. And an optical terminator (4) which is provided according to the optical distribution terminal (3), which is connected to the image distribution center via an optical cable to interface with a subscriber side, and is connected to the optical terminator (4) via a telephone line. A low cost video network comprising a subscriber premises device (5) for supplying corresponding service information to an ISDN terminal, a telephone, and a TV receiver in a subscriber premises, and for transmitting a service request signal of a subscriber to the optical terminator (4). rescue. 2. The video distribution center (3) according to claim 1, wherein the video distribution center (3) reverses the communication multiplexer (MUX) 310, which multiplexes and outputs the communication information from the telephone network 1, and the communication channel information from the subscriber side. The communication channel demultiplexer (DMX) 39, which is multiplexed and transmitted to the telephone network 1 side, receives and outputs a TV signal and a video program signal from the head end 2, and outputs a new program registration signal of the subscriber side. A first optical transmitter 34 for transmitting to the head end 2, a transmission DMX 35 for demultiplexing and outputting the output from the first optical transmitter 34, and a transmission DMX 35 for The video server 39 receives and stores video program information during output, and a space partitioning switch for switching and transmitting a TV signal and a video signal of the video server 37 during output of the transmission DMX 35 ( 314, and communication information from the communication MUX 310. And a plurality of channel MUX 311 for multiplexing and outputting video information from the space division switch 314, and a plurality of channel DMX 312 for demultiplexing communication information of a subscriber side and delivering the same to the communication DMX 39. And a plurality of second optical signals that convert the output of the channel MUX 311 into an optical signal and convert the optical communication information from the subscriber side into an electrical signal through the optical cable to the channel DMX 312. And a control device 38 for controlling the transmission device 313, the video server 37, and the space division switch 314, and providing a communication operation signal to a subscriber to the communication MUX 310. Low-cost video network architecture. The network management according to claim 2, wherein the new program registration request signal from the subscriber side is received and managed through the control device 38 and transmitted to the head end 2 through the first optical transmission device 34. The structure of a low-cost video network, characterized in that it further comprises a holding device (36). 4. The PSTN / ISDN matching unit 31 for interfacing the telephone and narrowband comprehensive information service with the telephone network 1 and the signal from the PSTN / ISDN matching unit 31 are de-mapped. And a communication channel mapper / demapper 33 for transmitting to the communication MUX 310 and mapping the signal from the communication DMX 39 to the PSTN / ISDN matching unit 31. Low-cost video network architecture. 5. The low cost video network structure according to claim 4, wherein the first optical transmission device is 2.5 Gbps. 5. The low cost video network structure according to claim 4, wherein the second optical transmission device (313) is 155 Mbps. The third optical transmission according to claim 3 or 4, wherein each of the optical terminators (4) communicates one-to-one with a second optical transmission device (313) in the image distribution center (3) via an optical cable. A device 41, a channel DMX 42 for demultiplexing and outputting a signal output from the third optical transmission device 41, and an output signal of the channel DMX 42 are subjected to high frequency modulation and output to a subscriber's telephone line And a plurality of high frequency demodulation / demodulation devices 44 for demodulating and outputting a signal from the subscriber side, and multiplexing the subscriber side signals through the high frequency modulation / demodulation device 44 to the 155M optical transmission device 41. A low cost video network structure including a channel MUX 43 for outputting. 8. The subscriber station apparatus (5) according to claim 7, wherein each subscriber premises (5) is connected one-to-one with a high-frequency modulation / demodulation device (51) in the optical terminator (4) via a telephone line, and signals from the optical terminator (4) side. And demodulate the signal on the subscriber side, and modulate the signal on the subscriber side and transmit the signal to the optical terminator 4 side, and the signal between the high frequency modulation / demodulation unit 51 and the subscriber's telephone and the ISDN terminal. And a set top 53 which modulates the digital program data demodulated by the high frequency modulation / demodulation device 51 into an analog signal of an NTSC signal and provides it to the subscriber's TV receiver. Low-cost video network structure.