KR100396651B1 - Local broadcasting Service method using Digital TV translator - Google Patents

Abstract

The present invention relates to a local broadcast service method using a digital TV repeater adapted to transmit a local broadcast signal in a digital TV repeater. The local broadcasting service method using the digital TV repeater according to the present invention includes a first requesting step for requesting local broadcasting from a local broadcasting station to a digital TV repeater, and granting the requested local broadcasting to the central control unit from the digital TV repeater. A second request step of requesting, receiving a local broadcast signal from the local broadcasting station as the central control unit permits the requested local broadcast, and a central broadcast received from the input local broadcast signal and the digital TV transmitter. Changing the program and system information (PSIP) of the signal; inserting and inputting the input local broadcast signal into the central broadcast signal according to the changed program and system information (PSIP), or transmitting the input local broadcast signal. It consists of sending separately While increasing the efficiency of use of digital television repeaters has the effect of quickly delivering the information needed by region to subscribers.

Description

Local broadcasting service method using digital TV repeater

The present invention relates to a digital TV repeater, and more particularly, to a local broadcast service method using a digital TV repeater adapted to transmit a local broadcast signal in 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 near 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 outputting an intermediate frequency (IF) signal by modulating the MPEG-II transport stream output from the modulator, and a filter for up-converting the intermediate frequency signal output from the modulator 201 to a VHF or UHF band. 202 and a power amplifying unit 203 for power amplifying the signal output from the filtering unit 202.

The digital TV repeater configured as described above receives a digital broadcast signal transmitted from the digital TV transmitter 100, demodulates it through the demodulator 200, converts it into a baseband signal, and performs error correction. Subsequently, the demodulated broadcast signal is modulated by the modulator 201 and amplified by the power amplifier 203 and then transmitted to subscribers located in an astigmatism zone.

However, the digital TV repeater which relays the conventional digital broadcast signal as described above has a problem in that it cannot transmit unique information of a region where it is located or a local broadcast signal provided by a local broadcasting station to subscribers. This not only does not effectively utilize digital TV repeaters installed in each region of astigmatism, but also provides inconvenience to local subscribers not quickly providing necessary information for each region.

Accordingly, an object of the present invention is to provide a local broadcast service method using a digital TV repeater for transmitting a local broadcast signal to subscribers in the digital TV repeater.

According to an aspect of the present invention for achieving the above object, the local broadcast service method using a digital TV repeater is a first request step for requesting a local broadcast from the local broadcast station to the digital TV repeater, and the central in the digital TV repeater A second requesting step of requesting permission of the requested local broadcast to a control unit, receiving a local broadcast signal from the local broadcasting station in accordance with the permission of the requested local broadcast from the central control unit, and inputting the local broadcast signal; Changing the program and system information (PSIP) of the central broadcast signal received from the signal and the digital TV transmitter, and inserting the input local broadcast signal into the central broadcast signal according to the changed program and system information (PSIP). Transmit or separately configure the inputted local broadcast signal. And a step of transmitting.

Preferably, when the local broadcast signal is not input for a predetermined time period, the digital TV repeater notifies the local broadcasting station of an error occurrence.

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.

Figure 3 is a block diagram showing a digital TV repeater according to the present invention.

4 is a diagram illustrating a central control system of a digital TV repeater according to the present invention.

5 is a flowchart illustrating a local broadcast service method using a digital TV repeater according to the present invention.

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

300: demodulation unit 301: PSIP conversion unit

302: multiplexer 303: modulator

304: filtration unit 305: power amplification unit

306: power synthesis unit 307: local broadcasting station

308 control unit 309 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 local broadcast service method using a digital TV repeater that transmits additional information provided from a central control unit to a subscriber through a local broadcast signal provided from a local broadcast station or an internet network / public network in a digital TV repeater.

To this end, the digital TV repeater according to the present invention is a program and information system protocol (hereinafter abbreviated as PSIP) of a broadcast signal according to a local broadcast signal provided by a local broadcast station or additional information provided by a central control unit. Change and insert the local broadcast signal into the central broadcast signal through the multiplexer, or selectively transmit only the local broadcast signal. Therefore, each digital TV repeater can program a unique program for each region and broadcast separately from the central broadcasting.

3 is a block diagram illustrating a digital TV repeater according to the present invention.

Referring to FIG. 3, the digital TV repeater according to the present invention includes a demodulator 300 which frequency-converts a received central broadcast signal into an intermediate frequency (IF) signal and demodulates it to output an MPEG-II transport stream. A PSIP converter 301 for converting PSIP information of the MPEG-II transport stream output from the demodulator 300 according to a local broadcast signal provided by the broadcasting station 307 or additional information provided by the central control unit; A multiplexer 302 for selectively outputting any one of the central broadcast signal and the local broadcast signal output from the converter 301 or inserting the local broadcast signal into the central broadcast signal, and the multiplexer 302 A modulator 303 for modulating a broadcast signal and outputting it as an intermediate frequency (IF) signal, and a filtering unit 304 for up-converting an intermediate frequency (IF) signal output from the modulator 303 to a VHF or UHF band. ), A power amplifying unit 305 and a power synthesizing unit 306 for power amplifying the broadcast signal output from the filtering unit 304, and a control unit 308 for performing system control for local broadcasting.

The control unit 308 is connected to the control unit 309 by RS-232, and also connected to the Internet network or the public communication network (PSTN) via Ethernet or Modem (Modem) to the central control unit (not shown) Is connected to At this time, the central control unit located at a far distance may transmit a control signal to the controller 308 through the Internet network or the public switched network (PSTN) to control the digital TV repeater or transmit additional information desired for broadcasting.

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

First, an operation in which the digital TV repeater transmits the central broadcast signal transmitted from the digital TV transmitter will be described.

First, the digital TV repeater receives a central broadcast signal transmitted from a digital TV transmitter (not shown). Then, the received central broadcast signal is input to the demodulator 300. The demodulator 300 then demodulates the central broadcast signal and outputs an MPEG-II transport stream of 19.39 Mbps.

The MPEG-II transport stream output from the demodulator 300 is input to the modulator 303 through the PSIP converter 301 and the multiplexer (MUX) 302, and the modulator 303 is connected to the wireless channel. 8 VSB (Vestigial Side Band) type modulation is performed to reduce the error occurrence rate by minimizing the interference and to correct the error on the receiving side.

Subsequently, the filter unit 304 collects the central broadcast signal modulated by the modulator 303 into a radio frequency (RF) signal, and the power amplifier 305 and the power synthesizer 306 convert into a radio frequency (RF) signal. The amplified center broadcast signal is amplified and transmitted through the antenna.

At this time, the control unit 308 is connected to each module constituting the digital TV repeater to control and monitor the operation of each module, and reports the operation state of the digital TV repeater according to the control device 309, the control device 309 The control unit 308 provides a control signal to control the operation of the digital TV repeater. The remote central control unit controls the digital TV repeater remotely from the outside through the Internet network or the public telecommunication network (PSTN).

As described above, the PSIP converter 301 and the multiplexer 302 merely transmit the MPEG-II transmission strum output from the demodulator 300 to the modulator 303 when the central broadcast signal is transmitted. .

On the other hand, when the digital TV repeater transmits the local broadcast signal, the operation is as follows.

Local broadcasting according to the present invention can be implemented in two forms. The first is to input local broadcast signal at local broadcasting station, and the second is to input additional information through internet network / public telecommunication network (PSTN) at central control unit.

First, when the local broadcast signal is input from the local broadcast station, the controller 308 notifies the PSIP converter 301 that the local broadcast signal is input and generates a control signal accordingly. Then, the PSIP converter 301 converts the PSIP information of the received central broadcast signal and the input local broadcast signal under the control of the controller 301. In this case, the PSIP conversion unit 301 determines whether to insert the local broadcast signal into the central broadcast signal or configure the local broadcast signal as a separate program and transmit the converted PSIP information accordingly, and the multiplexer 302 The local broadcast signal is inserted into the central broadcast signal according to the converted PSIP information, or the central broadcast signal and the local broadcast signal are selected and output respectively.

Subsequently, the central broadcast signal or the local broadcast signal output from the multiplexer 302 is transmitted to the subscriber via the modulator 303, the filter 304, the power amplifier 305, and the power synthesizer 306.

Here, the PSIP information is a set of tables already inserted in the MPEG-II transport stream for describing the system information and each event of the virtual channel for the central broadcasting.

Meanwhile, when the central control unit inputs additional information through the Internet network / public switched network, the controller 308 notifies the PSIP conversion unit 301 that the additional information is input and generates a control signal accordingly. Then, the PSIP converter 301 converts the PSIP information of the central broadcast signal under the control of the controller 308. The multiplexer 302 inserts and outputs additional information into the central broadcast signal according to the converted PSIP information.

The central broadcast signal output from the multiplexer 302 is then transmitted to the subscriber via the modulator 303, the filter 304, the power amplifier 305, and the power synthesizer 306.

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

Referring to FIG. 4, the digital TV transmitter and the digital TV repeater according to the present invention are connected to the central control unit through an internet network or a public communication network (PSTN). Therefore, the central control unit transmits additional information of the desired area to the digital TV repeater through the Internet network or the public communication network (PSTN).

5 is a flowchart illustrating a local broadcast service method using a digital TV repeater according to the present invention.

Referring to FIG. 5, the digital TV repeater according to the present invention implements a local broadcast service in two ways as follows.

The first method is to provide local broadcasting signals from local broadcasting stations and to transmit local broadcasting signals provided by digital TV repeaters. Is inserted into the central broadcast signal and transmitted.

This local broadcast service method is performed according to the following procedure.

First, the local broadcasting station requests the control unit of the digital TV repeater to transmit the local broadcasting signal (S500). Then, the digital TV repeater requests permission to transmit the local broadcast signal requested by the central control unit (S501).

If the central control unit permits the transmission of the local broadcast signal (S502), the digital TV repeater requests the input of the local broadcast signal to the local broadcasting station (S503). However, if the central control unit does not allow the transmission of the local broadcast signal, the local broadcasting station notifies of broadcast (S510).

Subsequently, when the local broadcasting signal is input from the local broadcasting station according to the step S503 (S504), the digital TV repeater changes the PSIP information of the central broadcasting signal and the local broadcasting signal through the PSIP conversion unit and changes the broadcasting to the multiplexing unit (MUX). The signal is output (S505). However, if the local broadcast signal is not input from the local broadcasting station within the threshold time already set in the step S504, the digital TV repeater notifies the local broadcasting station that an error has occurred (S509).

Subsequently, the multiplexer MUX inserts and outputs the local broadcast signal into the central broadcast signal according to the changed PSIP information, or selects and outputs only the local broadcast signal to the modulator to transmit the local broadcast signal to the subscribers (S506).

Subsequently, the digital TV repeater is set to a control mode for the local broadcast signal to control transmission of the local broadcast signal (S507).

On the other hand, when the central control unit transmits the additional information for each region to the digital TV repeater through the Internet network or public communication network, the digital TV repeater inserts the additional information transmitted from the central control unit and transmits it to the central broadcast signal. In this case, the PSIP converter converts the PSIP information of the central broadcast signal, and the multiplexer inserts additional information transmitted in the central broadcast signal according to the changed PSIP information.

As described above, the local broadcasting service method using the digital TV repeater according to the present invention can broadcast desired information for each region in a digital TV repeater located in a small city and a radio wave shadow area, thereby increasing the use efficiency of the digital TV repeater. It is effective to deliver the necessary information to the subscriber quickly by region.

In addition, there is an effect that the central control unit located at a remote location can broadcast different information for each region through the digital TV repeater using the Internet network / public communication network.

Claims (3)

A first request step of requesting local broadcasting from a local broadcasting station to a digital TV repeater, A second requesting step of requesting permission of the requested local broadcast from the digital TV repeater to a central control unit, Receiving a local broadcasting signal from the local broadcasting station according to the central broadcasting unit allowing the requested local broadcasting; Changing program and system information (PSIP) of the central broadcasting signal received from the inputted local broadcasting signal and the digital TV transmitter; And inserting the input local broadcast signal into the central broadcast signal according to the changed program and system information (PSIP), or separately configuring and transmitting the input local broadcast signal. Local broadcasting service method using. The method of claim 1, wherein in the step of inputting the local broadcast signal, And the digital TV repeater notifies the local broadcasting station of the occurrence of an error when the local broadcasting signal is not input for a predetermined threshold time. Transmitting, by the central control unit, additional information by region to the digital TV repeater through an internet network or a public communication network; Changing the program and system information (PSIP) of the central broadcast signal received from the digital TV transmitter as the additional information is input; And inserting the transmitted additional information into the received central broadcast signal according to the changed program and system information, and transmitting the received additional information.