KR100386570B1 - Method for control equal function of digital TV translator - Google Patents

Abstract

The present invention relates to a duplication method of a digital TV repeater, which is suitable for performing duplication of a controller for controlling a digital TV repeater. The duplexing method of the digital TV repeater according to the present invention includes a first step of checking whether the main controller is in a normal state in a digital TV repeater having a main controller and an auxiliary controller, and the main controller according to the check result. Is in an abnormal state, the second step of the secondary controller corrects an error occurring in the main controller, a third step of checking whether the main controller is constantly in an abnormal state, and the main controller according to the check result If the abnormal state is continuously, the fourth step of the secondary controller generates an alarm indicating the irrecoverability of the main controller and performs the operation of the main controller device, and the main devices under the control of the main controller A fifth step of checking whether it is in a normal state, and wherein the main devices are abnormal according to the check result In this case, the auxiliary controller has a sixth step of switching the operation of the main devices to perform the auxiliary devices, thereby preventing malfunction of the control unit, thereby minimizing the impact when an error occurs, and thus providing a stable digital broadcasting service. have.

Description

Redundancy method of digital TV repeater {Method for control equal function of digital TV translator}

The present invention relates to a digital TV repeater, and more particularly, to a duplication method of a digital TV repeater adapted to perform a duplication of a controller for controlling a digital TV repeater.

In general, the digital TV repeater is provided to service a radio shadow area where the digital broadcast signal does not reach, and serves to expand the viewing rights of the digital TV.

To this end, the digital TV repeater receives a broadcast signal transmitted from a digital TV transmitter and amplifies and transmits the received broadcast signal to a level that can be received by a subscriber located in a radio shadow area.

The digital TV repeater will be described in more detail.

1 is a block diagram illustrating a general digital TV broadcasting system.

Referring to FIG. 1, the digital TV broadcasting system amplifies a digital TV transmitter 100 for transmitting a broadcast signal input from a broadcasting station (not shown), and amplifies the broadcast signal transmitted from the digital TV transmitter 100 to a radio wave shadow area. It consists of digital TV repeaters 101-106 that transmit to located subscribers.

The operation of the digital broadcasting system configured as described above is as follows.

First, the digital broadcast transmitter 100 transmits a digital broadcast signal through the frequency F1. The digital broadcast transmitter 100 is generally located in a mountain or high building to transmit digital broadcast signals to subscribers. Accordingly, subscribers located around the digital broadcast transmitter 100 may receive a digital broadcast signal through an antenna installed on a roof or a TV antenna embedded in a digital TV.

However, subscribers in an astigmatism zone, which are located in a radio wave region such as a mountain or a hill, or are far from the digital broadcast transmitter 100 and receive a weak signal, may receive broadcast signals transmitted from the digital broadcast transmitter 100. You cannot watch it directly.

Digital TV repeaters (101 to 106) are installed for the subscribers in the blind spot. Here, the digital TV repeaters 101 to 104 located around the digital TV transmitter 100 relay the digital broadcast signals using the frequencies F2 or F3, respectively, and the other digital TV repeaters 105 and 106 are connected to their surroundings. The broadcast signals of the located digital TV repeaters 103 and 104 are respectively relayed.

FIG. 2 is a block diagram illustrating the digital TV repeater shown in FIG. 1.

Referring to FIG. 2, the digital TV repeater demodulates a received digital broadcast signal into an intermediate frequency (IF) signal, demodulates the demodulated signal, and outputs an MPEG-II transport stream. A modulator 201 for modulating the MPEG-II transport stream output from the modulator to output an intermediate frequency (IF) signal, and a filter for up-converting the intermediate frequency signal output from the modulator 201 to a VHF or UHF band. 202, a power amplifier 203 for power amplifying the broadcast signal output from the filter unit 202, and a controller 204 for controlling each device.

The digital TV repeater configured as described above receives a digital broadcast signal transmitted from the digital TV transmitter, demodulates it through the demodulator 200, converts it into a baseband signal, and performs error correction. Subsequently, the demodulated broadcast signal is subjected to 8VSB modulation by the modulator 201, the modulated broadcast signal is up-converted by the filter 202, and then amplified by the power amplifier 203 to provide subscribers located in the blind spot. Send to Herein, the controller 204 controls the demodulator 200, the modulator 201, the filter 202, and the power amplifier 203.

However, such a conventional digital TV repeater does not control each device when an error occurs in the control unit does not provide a stable digital broadcast service.

Accordingly, an object of the present invention is to provide a duplication method of a digital TV repeater to minimize the occurrence of errors by duplication of the control unit in the digital TV repeater in view of the problems of the prior art mentioned above.

According to an aspect of the present invention for achieving the above object, a duplication method of a digital TV repeater is a first step of checking whether the main controller is in a normal state in a digital TV repeater having a main controller and an auxiliary controller; A second step of correcting an error occurring in the main controller by the auxiliary controller if the main controller is in an abnormal state according to the check result, and a third step of checking whether the main controller is constantly in an abnormal state; A fourth step of, when the main controller is constantly in an abnormal state according to the check result, the sub-controller generates an alarm indicating an inability to recover the main controller and performs an operation of the main controller; A fifth step of checking whether the main devices under the control of the main controller are in a normal state; As a result, when the main devices are in an abnormal state, the sub-controller may perform a sixth step of switching the auxiliary devices to perform operations of the main devices.

Preferably, in the second step, if the main controller is in a normal state according to the check result, the main controller checks whether the main devices are in a normal state, and the main devices are in an abnormal state according to the check result. And a step of notifying the occurrence of errors of the main devices to the outside, and the main controller controlling the operation of the failed main devices. Also, in the fourth step, the main controller is in a normal state. The auxiliary controller checking whether the main devices are in a normal state; switching the auxiliary devices to perform operations of the main devices when the main devices are in an abnormal state according to a result of the check; Generating an alarm informing that the devices have been transferred.

1 is a block diagram showing a general digital TV broadcasting system.

FIG. 2 is a block diagram illustrating a digital TV repeater shown in FIG. 1.

3 is a view showing a central control system of the digital TV repeater according to the present invention.

Figure 4 is a block diagram showing a digital TV repeater according to the present invention.

5 is a flowchart illustrating a duplication method of a digital TV repeater according to a first embodiment of the present invention.

6 is a flowchart illustrating a duplication method of a digital TV repeater according to a second embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

400: power supply unit 401: demodulation unit

402: modulator 403: filter

404: temperature sensing unit 405: first switch

406: power amplifier 407: second switch

408: power synthesizer 409: control unit

410: control unit

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

The present invention proposes a duplication method of a digital TV repeater which minimizes an error of a control unit in a digital TV repeater.

To this end, in the present invention, the control unit includes a main controller and a PLD controller, and when the main controller malfunctions, the PLD controller performs the operation of the main controller instead. In addition, the PLD controller reconfirms the error information of the main devices to prevent unnecessary switching between the main device and the sub device.

3 is a view showing a central control system of the digital TV repeater according to the present invention.

Referring to FIG. 3, the digital TV repeater according to the present invention connects to an Internet network or a public communication network (PSTN) using Ethernet / Modem, and is located at a long distance through such an internet network or a public communication network. It is connected to the central control unit.

Therefore, the central control unit controls the operation of the digital TV repeater through the Internet network / PSTN.

Figure 4 is a block diagram showing a digital TV repeater according to the present invention.

Referring to FIG. 4, the digital TV repeater according to the present invention includes a demodulator 401 which frequency-converts a received digital broadcast signal into an intermediate frequency (IF) signal and demodulates it to output an MPEG-II transport stream. A modulator 402 for modulating the MPEG-II transport stream output from the grandfather 401 and outputting an intermediate frequency (IF) signal, and a frequency uplink of the intermediate frequency signal output from the modulator 402 to the VHF or UHF band The power of the first switch 405 for switching the filtering unit 403 to convert, the broadcast signal output from the filtering unit 403 to the power amplifier 406, and the broadcast signal switched by the first switch 405 A power amplifier 406 for amplifying, a second switch 407 for switching the broadcast signal output from the power amplifier 406 to the power synthesizer 408, and a broadcast signal switched in the second switch 407 A power synthesizer 408 for synthesizing the power of The control unit 409 for controlling the. Here, the power supply unit 400 supplies power required for each device, and the temperature reduction unit 404 adjusts the temperature of each device. The control device 410 is connected to the control unit 409 using RS232 to monitor the operation of the digital TV repeater to report to the system operator, and the system operator controls the digital TV repeater through the control device 410.

The digital TV repeater configured as described above is implemented as a redundant system and has a primary transmission path and a secondary transmission path. Therefore, the digital TV repeater has a main device and an auxiliary device.

Here, the controller is composed of a main controller using a controller and a PLD controller that performs the operation of the controller when an error occurs in the controller. The PLD controller is implemented with PLD logic.

More specifically, the main controller in charge of the main control of the digital TV repeater is in charge of the central processing unit (CPU) and the memory, address encoding and decoding for operating the central processing unit (CPU). It consists of a logic circuit. This main controller exchanges the alarm signals of the peripheral devices through the logic control circuit and the signals necessary for control with each peripheral device through RS232 communication with each peripheral device. On the other hand, the logic control circuit for preventing the error signal generation of the main controller and performing the function of the main controller instead is a PLD circuit, which is composed of a peripheral circuit for receiving an alarm signal from the peripheral devices.

The operation of the digital TV repeater configured as described above is as follows.

First, the digital TV repeater receives a broadcast signal transmitted from a digital TV transmitter (not shown). Then, the received broadcast signal is input to the demodulator 401. The demodulator 401 demodulates the broadcast signal and outputs an MPEG-II transport stream of 19.39 Mbps.

The MPEG-II transport stream output from the demodulator 401 is input to the modulator 402. The modulator 402 minimizes interference in a radio channel to reduce an error occurrence rate and corrects an error that has occurred. 8 VSB (Vestigial Side Band) modulation is performed.

Subsequently, the filtering unit 403 collects the broadcast signal modulated by the modulator 402 into a radio frequency (RF) signal, and the power amplifier 406 and the power synthesizing unit 408 collect a radio frequency (RF) signal. The broadcast signal is amplified and transmitted to the subscriber through the antenna.

At this time, the control unit 409 is connected to each device constituting the digital TV repeater to control and monitor the operation of each device, and reports the operation state of the digital TV repeater accordingly to the control device 410, the system operator controls the device The control signal is provided to the controller 409 through 410 to control the operation of the digital TV repeater. Here, a remote central control unit (not shown) monitors and controls the digital TV repeater remotely from the outside through an Internet network or a public communication network (PSTN).

5 is a flowchart illustrating a duplication method of a digital TV repeater according to a first embodiment of the present invention.

Referring to FIG. 5, a duplication method of the controller in the digital TV repeater described with reference to FIG. 4 is as follows.

First, when the digital TV repeater is operated, the main controller using the controller and the PLD controller using the PLD circuit periodically exchange signals with each other. Therefore, the PLD controller checks whether a signal is generated from the main controller (S500), and if there is no signal from the main controller according to the check result, determines that an error has occurred in the main controller. Then, an alarm is generated to the front LCD and the central control unit, thereby notifying the occurrence of an error of the main controller to the outside (S501).

The PLD controller then recovers the main controller (S502). At this time, the PLD controller initializes the main controller or controls the central processing unit (CPU) of the main controller to correct the error.

Subsequently, the PLD controller checks whether an error of the main controller is continuously occurring (S503). If the main controller operates normally according to the check result of step S503, the PLD controller checks whether an error has occurred in the main devices (S504). Here, the main devices are peripheral devices of the main controller, for example, a demodulator, a modulator, a filter, a power amplifier, and a power synthesizer located in the current transmission path.

If an error occurs in the primary devices according to the check result of step S504, the PLD controller transmits a switch command to the secondary devices to each of the secondary devices (S505), and indicates the system switching state and the occurrence of the system error of the primary controller. Notify outputs an alarm to notify the system operator (S506).

Subsequently, the PLD controller transmits an alarm notifying the system switch to the secondary device to the central control unit (S507), and controls the alarm state (S508).

On the other hand, if a signal is generated from the main controller in step S500, the PLD controller determines that the main controller is in normal operation, and the main controller checks whether an error has occurred in the main devices (S509). If an error occurs in the main devices according to the check result of step S509, the main controller transmits an alarm indicating that an error has occurred in the main devices to an external central control unit (S510). The generated main devices are controlled (S511).

On the other hand, if a continuous error occurs in the main controller in step S503, the PLD controller sends an alarm indicating that the recovery of the main controller is impossible (S512), and the PLD controller replaces the main controller. The main devices are controlled (S513).

The PLD controller checks whether an error has occurred with respect to the primary devices (S514), and if an error occurs in the primary devices according to the check result of the step S514, transmits a switch command to the secondary devices to each secondary device. To switch the operation of the main devices. However, if an error does not occur in the main devices according to the check result of step S514, the PLD controller continuously controls the main devices.

On the other hand, the main controller detects an error of the PLD controller. That is, since the main controller and the PLD controller exchange signals with each other to monitor the operation of the other party, the main controller initializes the PLD controller when an error occurs in the PLD controller, thereby correcting the error of the PLD controller and performing normal system control.

6 is a flowchart illustrating a duplication method of a digital TV repeater according to a second embodiment of the present invention.

Referring to FIG. 6, in the second embodiment, a duplication method of a digital TV repeater for correcting an incorrect error message under the control of the PLD controller when an incorrect error message is generated in the main controller will be described.

First, when a switch command from the main controller to the secondary device occurs (S600), the PLD controller receives the switch command generated from the main controller (S601).

Subsequently, upon receiving the switch command, the PLD controller checks the operation of the main devices to check whether the error information is correct (S602). If the error information generated in the main device is correct according to the check result, that is, if an error occurs in the main devices, the PLD controller transmits a switching command generated in the main controller to the sub device (S603), and accordingly the sub device in the main device. The system switching to is performed (S604).

However, if no error occurs in the main device according to the check result, the PLD controller requests confirmation of the error information to the main controller (S605).

According to the request of the PLD controller, the main controller checks the error information generated in the main device by using RS232 communication between the devices (S606).

If an error occurs in the main devices according to the check result of step S606, the main controller transmits a switch command to the sub device (S607). However, if an error has not occurred in the main devices according to the check result of the step S606, the main controller cancels the switching command and corrects the occurrence of the error (S608).

In the second embodiment described so far, the main controller and the PLD controller confirm the error occurring in the system together, thereby preventing unnecessary system switching due to an error in the error occurrence message.

As described above, according to the duplexing method of the digital TV repeater according to the present invention, in the digital TV repeater, the control unit is duplicated by using the main controller and the PLD controller using the controller to prevent the malfunction of the control unit, thereby minimizing the impact when an error occurs. It is effective in providing stable digital broadcasting service.

In particular, when the redundancy method of the digital TV repeater according to the present invention is applied, it is possible to satisfy the high reliability required for the digital TV repeater which is a broadcasting equipment.

Claims (4)

In a digital TV repeater having a main controller and a secondary controller, A first step of checking whether the main controller is in a normal state; A second step of correcting an error occurring in the main controller if the main controller is in an abnormal state according to the check result; A third step of continuously checking whether the main controller is in an abnormal state; A fourth step of, if the main controller is constantly in an abnormal state according to the check result, the sub-controller generates an alarm indicating an inability to recover the main controller and performs an operation of the main controller; A fifth step of the auxiliary controller checking whether the main devices controlled by the main controller are in a normal state; And a sixth step of switching, by the auxiliary controller, the auxiliary devices to perform operations of the main devices when the main devices are in an abnormal state according to the check result. The method of claim 1, wherein in the second step, If the main controller is in a normal state according to a result of the check, the main controller checking whether the main devices are in a normal state; Notifying the occurrence of errors of the main devices to the outside when the main devices are abnormal according to the check result; And controlling the operation of an error-prone main device by the main controller. The method of claim 1, wherein in the fourth step, When the main controller is in a normal state, the auxiliary controller checking whether the main devices are in a normal state; Switching the auxiliary devices to perform operations of the main devices when the main devices are in an abnormal state according to the check result; And generating an alarm informing that the auxiliary devices are transferred to the auxiliary devices. In a digital TV repeater having a main controller and a secondary controller, A first step of generating a switch command from the primary controller to a secondary device; A second step of the auxiliary controller checking whether the main devices are in error as the switching command is generated; A third step of requesting the main controller to reconfirm the error of the main devices, if an error has not occurred in the main devices according to the check result; A fourth step of the main controller checking whether the main devices are in error according to the request; And if the main device does not have an error according to a result of the check, the main controller canceling the generated switch command and correcting its own error.