KR100621736B1 - Method and apparatus for auto-switching of transmission line in a tv transmission line - Google Patents

Abstract

The present invention relates to a transmission path automatic switching method and apparatus therefor in a transmission network system. The present invention relates to a dual network consisting of a ring network, and implements a detector having a positive and negative determination function for each digital signal. According to the detection result, the signal is connected to a good transmission network in a dual network consisting of a ring network, that is, a main transmission path and a spare transmission path, thereby enabling a trouble-free TV signal transmission to a subscriber. The TV upstream line insertion device receives and analyzes motion data to prevent malfunction such as occupying the same transmission path at the same time, thereby improving reliability of the automatic protection device.

Description

METHOD AND APPARATUS FOR AUTO-SWITCHING OF TRANSMISSION LINE IN A TV TRANSMISSION LINE}

1 is a system configuration diagram of an over-the-air broadcasting network of a TV downstream automatic switching device to which the present invention is applied.

Figure 2 is a system configuration of a wired transmission network of the TV downstream automatic switching device to which the present invention is applied.

3 is a structural diagram of a digital transmission network including a TV transmission system to which the present invention is applied.

Figure 4 is a detailed configuration of the TV downstream automatic switching device according to the invention.

     <Description of Symbols for Major Parts of Drawings>

110: first relay station 111: second relay station

112: third relay station 114: uplink TV transmission signal

122: downlink TV transmission signal 150: broadcasting station

300: automatic switching 311: first TV wireless transceiver

321: second TV wireless transmitter and receiver 313: first signal distribution

314: upstream TV transmission signal 491: transmission signal switching unit

492: first DS-3 analyzer 493: second DS-3 analyzer

495 microprocessor

The present invention relates to a transmission path switching for improving the reliability of the downstream TV line in the operation of the transmission path, and more particularly, a transmission network being used in a relay station or a TV main control room receiving TV signals in a dual network of a TV transmission path configured in a ring shape. The present invention relates to a transmission network automatic switching method and apparatus for a TV transmission network that automatically switches to a preliminary transmission in the event of a failure.

In general, the TV transmission network relay method increases the reliability by the dual transmission system of the main transmission path, and this method provides the same two TV signals to a user such as a relay station or a TV control room operating an actual transmission path. Therefore, in case of some transmission line failures, the transmission line of the poor transmission line to the good transmission line is used to cope with TV transmission network failure.

However, such a line switching operation is performed by the operator's manual operation, and when the operator does not recognize the poor line condition of the transmission line, a situation such as interruption of TV broadcasting occurs for a long time. In the foundry, there are monitors for the monitoring of transmission networks and TV lines.

In addition, when the transmission line is defective, the operation of switching the line is performed by the operating personnel with individual differences, so an unreasonable operation method such as causing an error and causing another broadcasting accident or excessive switching time is applied until now. In particular, in order to improve management, the protection measures for TV lines have always been an obstacle when the automation plan such as unmanned relay facilities or remote centralized operation is promoted.

That is, in the operation of a conventional TV transmission network system, in case of a failure in the transmission network used in a dual network consisting of a ring network in a relay station or broadcasting foundry, the operation of switching between the main transmission path and the preliminary transmission channel is dependent on manual operation by a worker. As a result, there is a risk of large broadcasting accidents due to errors in circuit switching due to delays in recovery time as well as the operational capacity of the workers. There was this.

The present invention has been made to solve the problems described above, it is installed in the TV transmission network facilities to monitor the main transmission line and the preliminary transmission line to analyze the quality of the TV transmission line in real time analysis of the transmission line failure situation itself occurs According to the result, it is possible to automatically perform the circuit switching to the good transmission line, which makes it possible to reduce the accuracy and time required for the circuit switching, thereby improving the reliability of the TV transmission network and providing the optimal environment for the operation of the TV transmission network. It is an object of the present invention to provide a transmission network automatic switching method and apparatus in a TV transmission network.

The present invention for achieving the above object, a) converting a broadcast signal into a digital signal from the main transmission path in operation receiving in real time; b) converting the broadcast signal from the preliminary transmission in operation into a digital signal and receiving in real time; c) data processing and detecting respective digital signals received from the main transmission path and the preliminary transmission; d) comparing the detected digitalized digital signals with a set threshold value to determine a state of each transmission path; And e) performing a switching operation of the main transmission path or the preliminary transmission path according to the result determined in step (d).

In addition, the present invention for achieving the above object is the switching operation in step (d) is characterized in that the switching time is determined by the algorithm for protecting the circuit in various types of error occurrence that can occur in the transmission path It is done.

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

FIG. 1 is a diagram illustrating a structure of a transmission system of a relay station for relaying or distributing over-the-air TV broadcasts to which the present invention is applied. In addition, the third relay station 112 is another example of a transmission network relay station configured based on the first relay station 110. In addition, the fourth relay station 140 performs broadcast distribution in a specific area, and the broadcasting station 150 means that the broadcaster is a local broadcaster who receives a broadcast in the aforementioned fourth relay station 140.

The downlink TV transmission signal 121 is a signal received at the fourth relay station 140, and the uplink TV transmission signal 114 is a signal returned to the first relay station 110 via the third relay station 112. to be. The downlink TV transmission signal 122 is a signal received at the fourth relay station 140 via the third relay station 112, and the uplink TV transmission signal 124 is received at the fourth relay station 140. Is a signal back to the first relay station 110 along the transmission network.

The TV transmission signal 115 is a signal that is distributed through the third relay 112 and connected to the broadcasting station 150, and the TV transmission signal 125 distributes the downlink TV transmission signal 122 to the broadcasting station ( It is the signal waiting in the transfer selector to make the connection to 150). The output TV transmission signal 135 refers to a signal in which a good line is selected and output from TV transmission signals received in both directions.

The fourth relay station 140 includes an automatic switching unit 300 so as to analyze the signals received in the main transmission path and the preliminary transmission path, and by selecting and connecting a good line, the stabilized TV which is a transmission signal of the broadcasting station 150. The transmission signal 135 may be secured.

2 is a system of a cable TV transmission network to which the present invention is applied, and includes a program provider 210, a first transmission network relay facility 211, a second transmission network relay facility 221, and a local CATV broadcasting station 260. .

The TV transmission signal provided from the program provider 210 is transmitted to the first transmission network relay facility 211 and the second transmission network relay facility 221 by different transmission methods and transmission paths, respectively. That is, the first transmission network relay facility 211 receives and amplifies a broadcast program using a transmission medium and transmits the broadcast program to the optical end station device 214 of the local CATV broadcasting station 260 in the same optical relay method. Transmission network relay facility 221 receives the microwave (M / W) as a transmission medium and amplified and then transmitted to the dual channel (224) of the local CATV broadcasting station 260 to the same microwave (M / W) do.

In this way, the broadcast signal transmitted to the local CATV broadcasting station 260 is analyzed by the signal received from the main transmission path (here, optical cable) and the preliminary transmission path (here, microwave) through a relay device including an automatic switching unit. By selecting and connecting a good line, the local CATV broadcasting station 260 can secure the stabilized TV transmission signal 235.

On the other hand, Figure 3 is a configuration specifically showing the automatic switching in the TV transmission system to which the present invention is applied, the first TV wireless transmitter and receiver 311, the second TV wireless transmitter and receiver 321, the first signal distribution unit 313 And a second signal distribution unit 323, a TV downstream automatic switching unit 351, and a peripheral device unit 390.

The first TV wireless transmitter / receiver 311 receives a radio signal including a TV transmission signal received from one side and applies a demodulated TV transmission signal 312 to the first signal distribution unit 313 to be described later. The second TV wireless transmitter / receiver 321 receives a radio signal including a TV transmission signal received from the other side, and applies a demodulated TV broadcast signal 322 to the second signal distributor 323 which will be described later.

The first signal distribution unit 313 distributes the signal and transmits the uplink TV transmission signal 314 for retransmission in the received reverse direction to the second TV radio transmission and reception unit 321, and the TV transmission signal distributed for connection to a broadcasting station. 315 is transmitted to the TV downstream automatic switching unit 351. Here, the transmission line of the TV transmission signal 315 at this time is called a main transmission path. The second signal distribution unit 323 transmits the uplink TV transmission signal 324 for distributing the signal and retransmitting it in the received reverse direction to the second TV wireless transmission / reception unit 311 and transmitting the TV for distribution to the broadcasting station. The signal 325 is transmitted to the TV downstream automatic switching unit 351. In this case, the transmission line of the TV transmission signal 325 at this time is called a preliminary transmission path.

Therefore, the TV downstream automatic switching unit 351 detects a bad transmission signal by comparing the TV transmission signal 315 received through the main transmission path and the TV transmission signal 325 received through the preliminary transmission path with preset data. And automatically performs the switching operation so that a good transmission signal is output.

On the other hand, the TV downstream automatic switching unit 351 is connected to the manual control device 361, the data processor 371 and the peripheral data unit 381, the auxiliary data for determining the switching time of the switching device and manually A control signal for switching is applied.

Here, the operation of the TV downstream automatic switching unit 351 as described above will be described with reference to FIG. 4.

The TV transmission signal 315 received through the main transmission path is analyzed by the first DS-3 analyzer 492 for analysis by the DS-3 analyzer. In addition, the TV transmission signal 325 received through the preliminary transmission path is analyzed by the second DS-3 analyzer 493 for analysis by the DS-3 analyzer. The output signal 435 of the transmission signal switching unit 491 to be described later is analyzed by the third DS-3 analyzer 494 for analysis by the DS-3 analyzer. Therefore, the microprocessor 455 including the result output from each of the analyzers 492, 493, 494, and data for performing tasks such as requesting the start or release of a circuit change according to a preset state transition algorithm, may transmit the transfer control signal. The signal is transmitted to the transmission signal switching unit 491. Accordingly, the transmission signal switching unit 491 may transmit a good TV transmission signal to a broadcasting station through the switching operation.

As described in detail above, the present invention is implemented as an auxiliary device of a system in a TV transmission network, and has a function of connecting a broadcast program provider, a transmission network provider side, and a user side, and is effective in a failure situation caused by a failure of the program provider side transmission network. It provides the switching function to improve the reliability and improves the quality control function by using the accumulated transmission network system performance information, thereby providing efficient service and operation management.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the following claims You will have to look.

Claims (6)

a) converting and distributing a TV signal from a main transmission path into a digital signal and transmitting in real time; b) converting and distributing the broadcast signal from the preliminary transmission into a digital signal and transmitting in real time; c) analyzing and outputting the digital TV signal transmitted in steps (a) and (b); d) determining the state of each transmission path by comparing the analyzed digital TV signals with preset threshold values; And and e) automatically switching the main transmission path or the preliminary transmission path according to the result determined in step (d). The method of claim 1, The switching operation in the step (d) is a switching network automatic switching method in the TV transmission network, characterized in that the switching time is determined by an algorithm for protecting the circuit in the various types of error that can occur in the transmission path. a) means for converting and distributing a TV signal from a main transmission path into a digital signal for transmission in real time; b) means for converting and distributing the broadcast signal from the preliminary transmission into a digital signal and transmitting in real time; c) means for analyzing and outputting the digital TV signal transmitted from the means (a) and (b); d) means for determining the state of each transmission path by comparing the analyzed digital TV signals with preset threshold values; And and e) means for automatically performing a switching operation of the main transmission path or the preliminary transmission path according to the result determined by the means (d). A first TV radio transmitter / receiver 311 for receiving and demodulating a radio signal including a TV transmission signal received from one direction; A second TV radio transmitter / receiver 321 for receiving and demodulating a radio signal including a TV transmission signal received from the other direction; A first signal distribution unit (313) for distributing the demodulated signal from the first TV radio transmission / reception unit (311) to the second TV radio transmission / reception unit (321) and a broadcast station for retransmission in a received reverse direction; A second signal distribution unit 323 for distributing the demodulated signal from the second TV radio transmission and reception unit 321 to the first TV radio transmission and reception unit 311 and a broadcast station to retransmit the received signal in a reverse direction; And By comparing the TV transmission signals received through the first signal distribution unit 313 and the second signal distribution unit 323 with preset data, a bad transmission signal is detected and a transfer operation is automatically performed so that a good transmission signal is output. Transmission network automatic switching system in the TV transmission network, characterized in that comprises a TV downstream automatic switching unit 351 to perform. The method of claim 4, wherein The TV downstream automatic switching unit 351 is connected to the manual control device 361, the data processor 371 and the peripheral data unit 381, so that the auxiliary data for determining the switching time of the switching device and manual switching Transmission network automatic switching system in a TV transmission network, characterized in that for applying a control signal for. The method of claim 4, wherein The TV downstream automatic switching unit 351 may include a first DS-3 analyzer 492 for analyzing the TV transmission signal 315 inputted through the first signal distribution unit 313; A second DS-3 analyzer 493 for analyzing the TV transmission signal 325 distributed and input through the second signal distribution unit 323; A third DS-3 analyzer 494 for analyzing the output side transmission signal 435; A microprocessor 455 for outputting a control signal such as a start or release request for circuit switching according to a result output from each of the analyzers 492, 493, and 494 and a preset state transition algorithm; And The transmission network automatic switching system in a TV transmission network, characterized in that the transfer signal switching unit (491) for outputting a good TV transmission signal by switching in accordance with the control signal of the microprocessor (455).

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