KR20020077631A - Automatic tuning method for portable digital television set - Google Patents
Automatic tuning method for portable digital television set Download PDFInfo
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- KR20020077631A KR20020077631A KR1020010017408A KR20010017408A KR20020077631A KR 20020077631 A KR20020077631 A KR 20020077631A KR 1020010017408 A KR1020010017408 A KR 1020010017408A KR 20010017408 A KR20010017408 A KR 20010017408A KR 20020077631 A KR20020077631 A KR 20020077631A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4383—Accessing a communication channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/02—Arrangements for relaying broadcast information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream
Abstract
Description
본 발명은 휴대형 디지털 티브이의 자동 튜닝 기술에 관한 것으로, 특히 사용자가 휴대용 디지털 티브이를 휴대하고 다른 중계국의 관할 지역으로 이동할 때 이전에 시청하고 있던 방송을 계속해서 시청할 수 있도록 해당 채널을 자동으로 튜닝할 수 있도록 한 휴대형 디지털 티브이의 자동 선국 방법에 관한 것이다.The present invention relates to an automatic tuning technology of a portable digital TV, and more particularly, to automatically tune a channel so that a user can carry the portable digital TV and continue to watch a broadcast previously watched when moving to a jurisdiction of another relay station. It relates to a method of automatic tuning of a portable digital TV.
전자, 통신 및 반도체 등 관련기술의 꾸준한 발전에 힘입어 각종 전파 수신장치들이 소형화 및 고급화되고 있는 추세에 있으며, 이러한 기술 발전에 힘입어 향후 휴대 가능한 디지털 티브이가 등장할 것으로 예측된다.Due to the steady development of related technologies such as electronics, communications, and semiconductors, various radio receivers are being miniaturized and advanced, and portable digital TVs are expected to emerge in the future.
통상의 지상파 티브이 또는 라디오와 마찬가지로, 지상파 수신형 디지털 티브이 시스템의 경우에도 분할된 각 지역에 중계국을 설치하고 이들을 통해 방송을 중계하게 되는데, 이때 동일한 방송에 대해 각기 다른 반송주파수(carrier frequency)를 사용하여 중계하게 되어 있다. 왜냐하면, 인접 지역간에 유사한 반송주파수를 사용하는 경우 간섭현상이 발생되기 때문이다. 따라서, 사용자가 디지털 티브이를 휴대하고 다른 지역으로 이동하는 경우, 바로 이전 지역에서 시청하던 방송프로그램을 계속 시청하기 위해서는 해당 채널을 선국해야 한다.As in the conventional terrestrial TV or radio, a terrestrial digital TV system has a relay station installed in each divided region and broadcasts through them, using different carrier frequencies for the same broadcast. It is to be relayed. This is because interference occurs when similar carrier frequencies are used between adjacent areas. Therefore, when the user carries the digital TV and moves to another area, the channel must be tuned in order to continue watching the broadcasting program that was watched in the previous area.
예로써, 도 1에서와 같이 인접된 3개의 지역(Z1),(Z2),(Z3)의 중심부에 각각 중계국이 설치되어 서로 다른 반송주파수(예: Z1=100MHz, Z2=150MHz,Z3=170MHz)로 동일 방송(예: KBS1)을 중계하고, 사용자가 디지털 티브이를 휴대하고 이지역(Z1),(Z2),(Z3)을 차례대로(화살표 방향으로) 지나간다고 하자.For example, as shown in FIG. 1, relay stations are installed at the centers of three adjacent zones Z1, Z2, and Z3, respectively, and have different carrier frequencies (for example, Z1 = 100 MHz, Z2 = 150 MHz, and Z3 = 170 MHz). Let's say we broadcast the same broadcast (e.g. KBS1), and the user carries a digital TV and passes through this region (Z1), (Z2), and (Z3) in order (in the direction of the arrow).
이때, 사용자가 제1지역(Z1)에서 100MHz의 반송파를 수신하는 채널을 선국하여 KBS1 방송을 수신하다가 제2지역(Z2)으로 진입하면 주파수 간섭지역에서부터 화면이 불안정해진다. 이후 제2지역(Z2)으로 완전히 진입하면 이전의 채널을 통해서는 KBS1 방송을 수신할 수 없으므로 150MHz의 반송파를 수신하는 채널을 선국하여야 한다. 이후, 제3지역(Z3)으로 진입하여 KBS1 방송을 계속 시청하고자 하는 경우에는 170MHz의 반송파를 수신하는 채널을 선국하여야 한다.At this time, when the user selects a channel receiving a 100 MHz carrier wave in the first region Z1 to receive KBS1 broadcast and enters the second region Z2, the screen becomes unstable from the frequency interference region. After the second zone (Z2) is completely entered, the KBS1 broadcast cannot be received through the previous channel, so the channel receiving the 150 MHz carrier should be tuned. Subsequently, when entering the third region Z3 and continuing to watch the KBS1 broadcast, a channel receiving a 170 MHz carrier should be tuned.
이와 같이 종래 기술에 의한 지상파 수신형 디지털 티브이에 있어서는 다른 중계국 관할 지역으로 이동할 때 이전에 시청하던 방송을 계속 시청하기 위해 해당 반송 주파수를 수신하는 채널을 직접 선국해야 하므로 그에 따른 불편함이 수반되고, 더욱이 해당 채널을 기억하고 있지 못하거나 전파 인접지역에 위치한 경우 수 회에 걸쳐 다른 채널들을 선국해 보아야 하는 불편함이 있었다.As described above, in the conventional terrestrial-type digital TV, when moving to another relay station jurisdiction, the channel receiving the corresponding carrier frequency must be directly tuned in order to continue watching the previously watched broadcast. Moreover, there was an inconvenience of having to tune to other channels several times when the channel was not remembered or located in the vicinity of radio waves.
따라서, 본 발명의 목적은 디지털 티브이의 PSIP 정보 중 VCT로부터 현재 시청중인 채널의 고유정보를 취득하고, 중계국이 변경될 때 그 고유정보를 근거로 하여 해당 채널을 자동 선국하는 디지털 티브이의 자동 선국 방법을 제공함에 있다.Accordingly, an object of the present invention is to acquire the unique information of the channel currently being watched from the VCT among the PSTV information of the digital TV, and automatically tune the channel based on the unique information when the relay station is changed. In providing.
도 1은 무선 방송수신기에서 동일 방송을 수신하기 위한 채널 변경예를 보인 설명도.1 is an explanatory diagram showing an example of changing a channel for receiving the same broadcast in a wireless broadcast receiver;
도 2는 본 발명에 의한 휴대형 디지털 티브이의 자동 선국 방법의 신호 흐름도.2 is a signal flowchart of a method for automatic tuning of a portable digital TV according to the present invention;
도 3은 PSIP의 구조도.3 is a structural diagram of PSIP.
도 4는 VCT의 정보 테이블.4 is an information table of the VCT.
***도면의 주요 부분에 대한 부호의 설명****** Description of the symbols for the main parts of the drawings ***
Z1-Z3 : 제1-3지역 S1-S6 : 제1-6단계Z1-Z3: Area 1-3 S1-S6: Steps 1-6
본 발명에 의한 디지털 티브이의 자동 선국 방법은, 임의의 채널이 선국되면 그 채널을 통해 수신되는 VCT 정보 중 고유 정보를 검출하여 저장하는 제1과정과; 현재 채널을 통해 수신되는 반송주파수의 신호 감도를 주기적으로 체크하여 기 설정된 드레쉬홀드값 이하로 검출될 때, 다른 채널들을 순차적으로 스캐닝하여 상기 저장된 고유 정보와 동일한 정보가 존재하는 채널을 찾아내는 제2과정과; 이전에 시청중인 채널을 상기 동일한 정보가 존재하는 채널로 변경하는 제3과정으로 이루어지는 것으로, 이와 같은 본 발명의 작용을 첨부한 도 2 내지 도 4를 참조하여 상세히 설명하면 다음과 같다.The automatic TV tuning method according to the present invention includes a first step of detecting and storing unique information among VCT information received through a channel when a channel is tuned; A second step of periodically checking a signal sensitivity of a carrier frequency received through a current channel to detect a channel having the same information as the stored unique information by sequentially scanning other channels when detected below a preset threshold value; Process; A third process of changing a previously viewed channel to a channel in which the same information exists is described in detail with reference to FIGS. 2 to 4 attached to the operation of the present invention.
디지털 티브이 방송 시스템에서 PSIP(PSIP: Program and System Information Protocol)가 사용되는데, 이의 구조를 도 3에 나타내었다. 도 3에서와 같이 PSIP 정보에 VCT(VCT: Virtual Channel Table) 정보가 포함되어 있는데, 이 VCT로부터 현재 시청중인 채널의 고유 정보를 얻을 수 있다.PSIP (Program and System Information Protocol) is used in a digital TV broadcasting system, and its structure is shown in FIG. 3. As shown in FIG. 3, the PSIP information includes VCT (VCT) information. From this VCT, unique information of a channel currently being viewed can be obtained.
사용자가 휴대용 디지털 티브이를 휴대하고 임의의 방송 채널을 선국하여 시청하면서 다른 중계국 관할의 지역으로 이동하는 경우, 상기 VCT 정보에서 반송 주파수가 변경된다. 이와 같이 대부분의 방송 정보들은 지역에 따라 또는 시간에 따라 변경되지만 하나의 채널에서 절대로 변경되지 않는 고유 정보가 있다.When a user carries a portable digital TV and tunes to and watches a certain broadcast channel, the carrier frequency is changed in the VCT information. As such, most broadcast information is unique according to region or time, but never changes in one channel.
도 4는 상기 VCT의 테이블 섹션을 나타낸 것으로 여기서, 쇼트 네임(short_name), 메이저 채널번호(major_channel_number), 마이너 채널번호 (minor_channel_number)는 동일 방송인 경우 시간과 수신지역에 관계 없이 고정되는 고유 정보이다.4 shows a table section of the VCT, where a short name (short_name), a major channel number (major_channel_number), and a minor channel number (minor_channel_number) are unique information fixed regardless of time and reception area in the same broadcast.
사용자가 디지털 티브이의 파워를 온시키고 임의의 채널을 선택하여 원하는 방송 프로그램을 시청하고 있을 때, 그 티브이 내의 제어부에서는 상기 현재 선국된 채널을 통해 수신되는 VCT에서 쇼트 네임, 메이저 채널번호, 마이너 채널번호를검출하여 저장해 둔다.(S1,S2)When the user turns on the digital TV and selects an arbitrary channel to watch a desired broadcast program, the control unit in the TV controls a short name, a major channel number, and a minor channel number in a VCT received through the currently tuned channel. To be detected and stored. (S1, S2)
이때, 현재 채널을 통해 수신되는 반송주파수의 신호 감도를 주기적으로 체크하여 기 설정된 드레쉬홀드값 이상이면 사용자가 요구하지 않는 이상 현재의 채널을 변경하지 않고 그대로 유지하게 된다.(S3)At this time, the signal sensitivity of the carrier frequency received through the current channel is periodically checked and if the threshold value is greater than or equal to the preset threshold value, the current channel is maintained without changing unless it is requested by the user (S3).
하지만, 사용자가 현재의 중계국 관할 지역에서 다른 중계국의 관할 지역으로 이동하거나, 기타 다른 이유로 인하여 상기 반송주파수의 신호 감도가 드레쉬홀드값 이하로 떨어지면, 다른 채널들을 순차적으로 스캐닝하여 상기 쇼트 네임, 메이저 채널번호, 마이너 채널번호와 동일한 정보가 존재하는지 확인한다.(S4,S5)However, if the user moves from the current relay station jurisdiction to the other relay station, or if for some other reason the signal sensitivity of the carrier frequency falls below the threshold value, other channels are sequentially scanned to detect the short name, major Check whether the same information as the channel number and minor channel number exists (S4, S5).
만약, 상기의 스캐닝 결과 동일한 정보가 존재하는 채널을 발견하면 바로 그 채널이 바로 이전 지역에서 시청하던 방송을 수신하는 채널로 판단하여 즉, 기존의 시청중인 채널의 주파수가 변경된 것으로 판단하여 해당 채널을 튜닝하게 된다.(S6)If the channel is found to have the same information as a result of the scanning, it is determined that the channel is a channel for receiving a broadcast that was previously watched in the previous region, that is, it is determined that the frequency of the existing channel has been changed. Tuning is performed (S6).
따라서, 사용자는 별다른 조치를 취하지 않고도 이전 지역에서 시청하던 방송을 계속해서 시청할 수 있게 된다.Thus, the user can continue to watch the broadcasts that he was watching in the previous region without taking any action.
이상에서 상세히 설명한 바와 같이 본 발명은 디지털 티브이의 PSIP 정보 중 VCT로부터 현재 시청중인 채널의 고유정보를 취득하고, 중계국이 변경될 때 그 고유정보를 근거로 해당 채널을 자동 선국하게 되므로, 사용자 입장에서 볼 때 중계국이 변경되는 경우 별다른 조치를 취하지 않고도 이전 지역에서 시청하던 방송을 계속해서 시청할 수 있는 편리함이 있다.As described in detail above, the present invention acquires the unique information of the channel currently being watched from the VCT among the PSIP information of the digital TV, and automatically selects the corresponding channel based on the unique information when the relay station is changed. When the relay station changes, it is convenient to continue watching the broadcasts that were being watched in the previous region without any action.
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20060034555A (en) * | 2004-10-19 | 2006-04-24 | 엘지전자 주식회사 | A method and a apparatus of automatic searching channel on broadcasting for mobile phone |
KR100770870B1 (en) * | 2005-12-22 | 2007-10-26 | 삼성전자주식회사 | Apparatus and method for updating broadcasting service information in digital multimedia broadcasting terminal |
WO2009072729A1 (en) * | 2007-12-03 | 2009-06-11 | Daewoo Electronics Corporation | Method for switching between minor channels for digital televisions |
US7688800B2 (en) | 2005-07-15 | 2010-03-30 | Samsung Electronics Co., Ltd. | Digital broadcast receiver and directed channel change method thereof |
CN1968025B (en) * | 2005-11-18 | 2011-09-28 | 鸿富锦精密工业(深圳)有限公司 | Radio receiving set and method |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100253207B1 (en) * | 1997-11-13 | 2000-04-15 | 구자홍 | Method for automatic selection of broadcasting system using auto search |
KR19990048282A (en) * | 1997-12-09 | 1999-07-05 | 김영환 | Broadcasting channel automatic tuning device using `` GE '' code when moving to other regions |
KR19990036100U (en) * | 1998-02-13 | 1999-09-15 | 전주범 | Automatic Channel Tuning Device for Portable Television |
KR100317296B1 (en) * | 1999-11-11 | 2001-12-24 | 구자홍 | Method and apparatus for controlling channel of a digital TV |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20060034555A (en) * | 2004-10-19 | 2006-04-24 | 엘지전자 주식회사 | A method and a apparatus of automatic searching channel on broadcasting for mobile phone |
US7688800B2 (en) | 2005-07-15 | 2010-03-30 | Samsung Electronics Co., Ltd. | Digital broadcast receiver and directed channel change method thereof |
CN1968025B (en) * | 2005-11-18 | 2011-09-28 | 鸿富锦精密工业(深圳)有限公司 | Radio receiving set and method |
KR100770870B1 (en) * | 2005-12-22 | 2007-10-26 | 삼성전자주식회사 | Apparatus and method for updating broadcasting service information in digital multimedia broadcasting terminal |
WO2009072729A1 (en) * | 2007-12-03 | 2009-06-11 | Daewoo Electronics Corporation | Method for switching between minor channels for digital televisions |
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