KR20080075990A - Apparatus and method for automatically converting an air in a t-dmb - Google Patents

Apparatus and method for automatically converting an air in a t-dmb Download PDF

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Publication number
KR20080075990A
KR20080075990A KR1020070015299A KR20070015299A KR20080075990A KR 20080075990 A KR20080075990 A KR 20080075990A KR 1020070015299 A KR1020070015299 A KR 1020070015299A KR 20070015299 A KR20070015299 A KR 20070015299A KR 20080075990 A KR20080075990 A KR 20080075990A
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KR
South Korea
Prior art keywords
broadcast
signal strength
information
module
stream
Prior art date
Application number
KR1020070015299A
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Korean (ko)
Inventor
정우석
Original Assignee
주식회사 대우일렉트로닉스
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Priority to KR1020070015299A priority Critical patent/KR20080075990A/en
Publication of KR20080075990A publication Critical patent/KR20080075990A/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H03J1/0058—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with channel identification means
    • H03J1/0066—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with channel identification means with means for analysing the received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/26—Arrangements for switching distribution systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/38—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space
    • H04H60/41—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas
    • H04H60/44—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas for identifying broadcast stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/11—Aspects of broadcast communication characterised by the type of broadcast system digital multimedia broadcasting [DMB]

Abstract

An apparatus and a method for automatically converting broadcasting in a T-DMB(Terrestrial-Digital Multimedia Broadcasting) receiver are provided to measure signal strength of a broadcasting stream outputted within a predetermined range by using TII(Transmitter Identification Information) timing information when a user moves between regions, and automatically convert a frequency band through an identifier ID in TII of a broadcasting stream having the biggest signal strength as well as automatically changing broadcasting channel information. A table(208) stores frequency band information by identifier ID(Identification). An RF(Radio Frequency) module(200) receives a broadcasting stream broadcasted from at least one or more transmitters within a preset range if a broadcasting stream having signal strength lower than a preset value is received from an arbitrary transmitter while receiving the broadcasting stream from the arbitrary transmitter. A signal strength measuring module(204) detects signal strength of each broadcasting stream, and extracts information about a broadcasting stream having the biggest signal strength among the broadcasting streams. An information detecting module(206) extracts an identifier ID from the broadcasting stream extracted by the signal strength detecting module, and searches the table to extract frequency band information corresponding to the extracted identifier ID. A controller(210) scans a broadcasting channel by controlling the RF module through the extracted frequency band information.

Description

Broadcasting automatic switching device and method of terrestrial DMB receiver {APPARATUS AND METHOD FOR AUTOMATICALLY CONVERTING AN AIR IN A T-DMB}

1 is a diagram illustrating a method of granting a transmitter identifier ID (ID) for serving a terrestrial DMB broadcast, which is a technical basis for implementing the present invention;

2 is a block diagram showing an internal configuration of a broadcast automatic switching device of a terrestrial DMB receiver according to an embodiment of the present invention;

3 is a flowchart illustrating a broadcast switching process in a terrestrial DMB service according to an exemplary embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

200: RF module 202: TII parsing module

204: signal strength measurement module 206: information detection module

208 table 210 control unit

212: memory 214: MPEG decoder

The present invention relates to an apparatus and method for automatically switching broadcasting of a terrestrial DMB broadcasting receiver.

Terrestrial DMB is a proposed system that can receive multimedia information or data through a terminal while moving, and is already being piloted.

DMB is a system that is proposed to receive multimedia information or data through a portable broadcast receiver equipped with an individual while moving. The DMB has been separately developed into a terrestrial DMB and a satellite DMB, and some of them have already been prototyped.

The terrestrial DMB and the satellite DMB are different from each other in managing channels. Here, the channel management method of the terrestrial DMB will be described.

First, the terrestrial DMB allocates separate frequency blocks to broadcasters, and each broadcaster allocates a plurality of video channels, audio channels, and data channels by dividing the frequency blocks given to the broadcasters. Therefore, since one frequency block can be divided into several channels, channels for one such frequency block are called ensemble.

Therefore, the terrestrial DMB analyzes the ensemble information corresponding to all frequency blocks at the time of initial driving, acquires configuration information about all channels that can be actually watched therein, and then manages it as channel information. The initial purchase of a DMB may be done by a service center or a seller. That is, through this process, configuration information of all channels is stored in a table or database form to continuously provide information to be used when a user selects a channel.

The user can check a list of channels that can be actually watched, and select a desired channel to watch the channel.

Meanwhile, the terrestrial DMB service is provided through a transmitter installed in each region, for example, a repeater, and each transmitter serving the terrestrial DMB broadcasts video, audio, and data through a predetermined number of channels using different frequencies.

In addition, the terrestrial DMB service is a unidirectional service system in which a transmitter unilaterally transmits a broadcast and a receiving terminal receives the corresponding broadcast.

As described above, since the terrestrial DMB service provides a transmitter installed in each region, a user may have to perform a channel search to find a channel provided by a transmitter installed in a corresponding region when the region moves.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art, and to provide an apparatus and method for automatically switching a terrestrial DMB receiver capable of automatically switching a frequency and a broadcast channel according to local movement.

In order to achieve the above object, the present invention provides a broadcast automatic switching device of a terrestrial DMB receiver for receiving the broadcast stream from a plurality of transmitters broadcasting a terrestrial DMB broadcast stream including different identifier IDs in different frequency bands. A table having the frequency band information for each identifier ID and a broadcast stream having a signal strength equal to or less than a predetermined value while receiving a broadcast stream from any transmitter are within the preset range. An RF module for receiving the broadcast streams broadcast from at least one transmitter, a signal strength measurement module for detecting the signal strength of each broadcast stream and extracting information on the broadcast stream having the largest signal strength among the broadcast streams; Signal strength detection module An information detection module for extracting an identifier ID from the broadcast stream extracted from the PDU, searching the table to extract frequency band information corresponding to the extracted identifier ID, and controlling the RF module with the extracted frequency band information for broadcasting. And a control unit for scanning the channel.

In addition, the present invention, (a) giving an identifier ID for each transmitter, (b) each transmitter includes a unique identifier ID assigned to them in the broadcast stream within a predetermined range of different frequency bands Broadcasting; and (c) if the broadcast stream having a signal strength less than or equal to a predetermined value is received from the arbitrary transmitter during the reception of the broadcast stream from any transmitter, the receiver is at least one within a preset range. Receiving a broadcast stream broadcast from a transmitter, (d) measuring signal strength of each received broadcast stream, (e) selecting any one broadcast stream based on the measured signal strength, The frequency band corresponding to the identifier ID in the broadcast stream is searched in the table in the receiver. Phase and, (f) includes the step of scanning the broadcast channel using the detected frequency band.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a method of assigning a transmitter identifier ID (ID) for serving a terrestrial DMB broadcast, which is a technical basis for implementing the present invention, and is a transmitter in Eureka-147 that forms the basis of a terrestrial DB scheme. This is an example of identifier assignment.

As shown in FIG. 1, each transmitter is assigned a plurality of subclass type identifiers consisting of a main ID and a sub ID. That is, to distinguish the entire region from other regions, it may be distinguished by the main ID "00", and may be distinguished by "00_xx" to distinguish individual transmissions.

Although Eureka-147 does not specifically provide a transmitter identifier, a method of transmitting a transmitter identifier in a null symbol section of TII (Transmitter Identification Information), which is a header part of TS (Transport Stream) data, which is a broadcast stream, is known. In addition, it is known that accurate latitude and longitude information of each transmitter is installed in the service information field.

That is, a terrestrial DMB transmitter installed in each region broadcasts a terrestrial DMB broadcast stream to different frequency bands, and is shown in FIG. 1 in a channel symbol section of TS (Transport Stream) data that is a broadcast stream when the terrestrial DMB broadcast stream is transmitted. Broadcast with the same different identifier ID.

Each broadcast stream thus broadcasted is received at a terrestrial DMB receiver within the range of each terrestrial DMB transmitter. The terrestrial DMB receiver may receive a broadcast stream transmitted from at least one terrestrial DMB transmitter at its location, and its internal configuration will be described with reference to FIG. 2.

2 is a block diagram illustrating an internal configuration of an apparatus for automatically switching broadcasting of a terrestrial DMB receiver according to an exemplary embodiment of the present invention.

Referring to FIG. 2, a broadcast switching device of a terrestrial DMB receiver includes: an RF module 200 for receiving a broadcast stream to be broadcast, a TII parsing module 202 for parsing a broadcast stream to extract TII information, and each broadcast stream. After extracting the identifier ID in the TII information extracted by the signal strength measurement module 204 and the TII parsing module 206 for measuring the strength of the signal, the search for the frequency band information corresponding to the extracted identifier ID in the table 208. A control unit for scanning the broadcast channel information provided with the detected frequency band information by controlling the information detection module 206, a table 208 storing frequency band information for each identifier ID for each transmitter, and the RF module 200. 210, a memory 212 in which broadcast channel information is stored, and an MPEG decoder 214 for decoding a broadcast stream received through the RF module 200.

When the broadcast stream is not received, that is, when a broadcast stream having a predetermined signal strength or less is received through the RF module 200 and the MPEG decoder 214 does not operate, the controller 210 controls the RF module 200. Control the broadcast auto switching mode. Accordingly, the RF module 200 receives a broadcast stream transmitted from at least one transmitter under the control of the controller 210 and provides it to the TII parsing module 202.

The TII parsing module 202 parses the TII portion in the broadcast stream and provides it to the signal strength measurement module 204.

The signal strength measurement module 204 detects timing information of the TII signal using a null symbol section of each TII, detects each carrier power of the detected timing information, and then detects TII information having the largest carrier power. To module 206.

The information detection module 206 extracts the identifier ID from the TII portion, searches the table 208, extracts frequency band information corresponding to the extracted identifier ID, and provides the extracted information to the controller 210.

The controller 210 controls the RF module 200 with the frequency band information, scans the broadcast channel information for providing the terrestrial DMB service in the frequency band, and stores the scanned broadcast channel information in the memory 212. That is, the RF module 200 changes the transmitter to receive the broadcast.

A process of operating the broadcast switching device of the terrestrial DMB receiver having the above configuration will be described with reference to FIG. 3.

3 is a flowchart illustrating a broadcast switching process in a terrestrial DMB service according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the terrestrial DMB receiver receives a broadcast stream output from an arbitrary transmitter in an arbitrary region, decodes it through an MPEG decoder 214, and receives a broadcast service (S300). It is determined whether the signal intensity of the broadcast stream received by the module 200 falls below a preset value, that is, whether the MPEG decoder 214 is not operated to enter a shadowed area (area of poor reception sensitivity) (S302). ).

As a result of the determination in step S302, when entering the shadow area, the controller 210 enters the broadcast automatic switching mode and controls the RF module 200, thereby existing within a preset range of the terrestrial DMB receiver through the RF module 200. In step S304, a broadcast stream transmitted from at least one transmitter is received.

The RF module 200 provides each broadcast stream received under the control of the controller 210 to the TII parsing module 202, and the TII parsing module 202 parses the TII portion of each broadcast stream to measure signal strength. It provides to 204 (S306).

The signal strength measurement module 204 detects timing information using a null symbol section of each TII, and detects carrier power for each broadcast stream based on the detected timing information. Then, the signal strength measuring module 204 provides the information detecting module 206 with the TII of the broadcast stream transmitted from the transmitter having the largest signal strength, that is, the closest to the terrestrial DMB receiver, based on the detected carrier power ( S308).

The information detection module 206 searches for the TII provided by the signal strength measurement module 204 to extract the identifier ID, searches the frequency band information corresponding to the identifier ID through a table search, and provides the same to the controller 210. (S310, S312).

The control unit 210 controls the RF module 200 based on the frequency band information provided by the information detection module 206, so that the RF module 200 scans a broadcast channel serviced by a transmitter using the frequency band information and controls the control unit. Provided at 210. Accordingly, the controller 210 updates the broadcast channel stored in the memory 212 (S314).

Meanwhile, although a preferred embodiment of the present invention has been described as an example of scanning a broadcast channel based on frequency band information, as another embodiment, an ensemble structure according to a frequency block output in the process of being decoded by the MPEG decoder 214 is analyzed. In this case, all channel configuration information provided by the transmitter can be obtained.

According to the present invention, the signal strength of a broadcast stream output within a predetermined range is measured by using TII timing information when moving between regions, and the frequency band is automatically adjusted through an identifier ID in the TII of the broadcast stream having the largest measured signal strength. Not only can it be switched to, it can also change the broadcast channel information automatically.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

As described above, the present invention measures the signal strength of a broadcast stream output within a predetermined range using TII timing information when moving between regions, and measures the frequency through the identifier ID in the TII of the broadcast stream having the largest measured signal strength. Not only can the band be automatically switched, but also the broadcasting channel information is automatically changed to provide the user's convenience.

Claims (6)

A broadcast automatic switching device of a terrestrial DMB receiver for receiving the broadcast streams from a plurality of transmitters broadcasting terrestrial DMB broadcast streams having different identifier IDs in different frequency bands, A table having frequency band information for each identifier ID; RF for receiving a broadcast stream broadcast from at least one transmitter within a preset range when the broadcast stream having a signal strength less than or equal to a predetermined value is received from the arbitrary transmitter while receiving a broadcast stream from any transmitter. Module, A signal strength measuring module for extracting information on the broadcast stream having the largest signal strength among the broadcast streams after detecting the signal strength of each broadcast stream; An information detection module extracting an identifier ID from the broadcast stream extracted by the signal strength detection module and searching the table to extract frequency band information corresponding to the extracted identifier ID; Control unit for scanning the broadcast channel by controlling the RF module with the extracted frequency band information Broadcast automatic switching device of the terrestrial DMB receiver comprising a. The method of claim 1, The broadcast automatic switching device, And a TII parsing module for parsing each broadcast stream received through the RF module to detect each TII. The signal strength measurement module detects timing information using a null symbol interval of each TII parsed by the TII parsing module, and measures signal strength of each broadcast stream using the detected timing information. Broadcast automatic switching device of the terrestrial DMB receiver, characterized in that. The method of claim 1, The control unit, And a broadcast channel information obtained by analyzing an ensemble structure in a broadcast stream received from the RF module through the extracted frequency band information. (a) assigning an identifier ID to each transmitter; (b) the transmitters including the unique identifier IDs assigned to the broadcasters in the broadcast stream and broadcasting them in different frequency bands within a preset range; (c) If the broadcast stream having a signal strength less than or equal to a predetermined value is received from the arbitrary transmitter while receiving the broadcast stream from any transmitter, the receiver broadcasts broadcast from at least one transmitter within a preset range. Receiving a stream, (d) measuring signal strength of each of the received broadcast streams; (e) selecting any one broadcast stream based on the measured signal strength and searching for a frequency band corresponding to an identifier ID in the broadcast stream in a table in the receiver; (f) scanning a broadcast channel using the searched frequency bands Broadcast automatic switching method of the terrestrial DMB receiver comprising a. The method of claim 4, wherein In step (d), Parsing TII information in each of the received broadcast streams; Detecting carrier power for each broadcast stream using timing information of each TII; Measuring the strength of the signal using the detected carrier power Broadcast automatic switching method of the terrestrial DMB receiver further comprising. The method of claim 5, wherein The automatic broadcast switching method, Acquiring broadcast channel information by analyzing an ensemble structure in the broadcast stream received from the RF module through the found frequency band; Broadcast automatic switching method of the terrestrial DMB receiver further comprising.
KR1020070015299A 2007-02-14 2007-02-14 Apparatus and method for automatically converting an air in a t-dmb KR20080075990A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009034218A1 (en) 2008-08-04 2010-02-11 Samsung Electronics Co., Ltd., Suwon fridge
KR101526570B1 (en) * 2008-10-30 2015-06-10 엘지이노텍 주식회사 Apparatus for Digital Multimedia Broadcasting and method of controlling the thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009034218A1 (en) 2008-08-04 2010-02-11 Samsung Electronics Co., Ltd., Suwon fridge
KR101526570B1 (en) * 2008-10-30 2015-06-10 엘지이노텍 주식회사 Apparatus for Digital Multimedia Broadcasting and method of controlling the thereof

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