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【發明領域】 本發明是有關於-種數位電視字幕選擇方法及其系 統，特別是指-種能供使用者在接收無線廣播站輸出各個 具有多國語言字幕資料的子頻道中，選擇字幕語言的方法 5 及系統。 【發明背景】 數位電視是將節目資訊中的動態視訊與語音壓縮標準 依照MEPG-2 W見訊壓縮標|，壓縮成數位型態的傳播串 流（Transport Stream)傳播，而在一個頻道可分出多數個子 10頻道，每-個子頻道提供一個節目，相較於一般類比電視 一個頻道僅能提供一個節目，可提供更多的節目播放。另 外，數位電視除了上述之優勢，更可較類比電視提供更多 之服務，如提供節目表單，及加入各種不同語言之字幕。 就加入不同浯吕子幕之服務而言，由於一般類比電視是將 15字幕壓在影像訊號中，於收視戶端一起與影像一起播出， 所以目刖類比電視之收視戶僅能觀看固定壓縮在影像中之 子幕，無法選擇所欲觀看之語言字幕，而目前Dvb標準之 數位電視無線廣播站雖提供了可在一個節目中，加入多種 不同語言之字幕，但目前在收視戶端的視訊轉換盒（Set_t〇p 20 Box)並無相對提供選擇字幕語言之功能，所以在收視戶端 並無法進行字幕語言之選擇。 【發明概要】 因此，本發明之一目的，即在提供一種可供使用者在 各子頻道之節目中選擇字幕語言之方法及系統。 本紙張尺度適奸涵家標準（CNS) A4規格（21〇χ 297公餐） 第4頁 576110[Field of the Invention] The present invention relates to a digital television subtitle selection method and a system thereof, and particularly to a digital subtitle channel that allows users to select subtitle languages in sub-channels with multilingual subtitle data received by wireless broadcast stations. Method 5 and system. [Background of the Invention] Digital television compresses dynamic video and voice compression standards in program information according to the MEPG-2 W compression standard, and compresses it into a digital type of transmission stream (Transport Stream), which can be divided in one channel. There are a large number of sub-10 channels, and each sub-channel provides one program. Compared with the general analog TV, one channel can only provide one program, which can provide more program playback. In addition, in addition to the above advantages, digital TV can provide more services than analog TV, such as providing program forms and adding subtitles in various languages. In terms of joining the services of different TV stations, because analog TV generally presses 15 subtitles into the video signal and broadcasts it with the video at the viewing client, the viewers of the analog TV can only watch fixed compression. The sub-screen in the video cannot choose the language subtitles you want to watch. Although the current Dvb standard digital TV radio station provides subtitles that can add multiple different languages to a program, it is currently in the video conversion box of the viewing client. (Set_top 20 Box) There is no relative function to select the subtitle language, so the subtitle language cannot be selected in the viewing client. [Summary of the Invention] Therefore, an object of the present invention is to provide a method and system for a user to select a subtitle language in a program of each subchannel. This paper is compliant with CNS Standard A4 (21〇χ 297 meals) Page 4 576110
本發明之另一目的，即在提供一種可配合頻道切換及 2播映節目之時間’以可於適當時間顯示字幕之方法及系 於是，本發明數位電視字幕選擇方法，是在無線廣播 5 =之發廷端送出字幕資料流，於接收端接收到該字幕資料 =，即可利用本發明進行選擇字幕語言之動作，其方法包 :有接收字幕資料步驟，所接收之字幕資料具有紀錄一 節目各種語言字幕的一語言辨識碼；一接收選擇訊號步 驟、，接收使用者輸入所欲觀看字幕語言之選擇訊號，並依 10該選擇訊號選出其一語言辨識碼；最後在一顯示字幕步驟 中，將所選出之語言辨識碼所對應的語言字幕顯示出；因 此在各個子頻道之節目中，依上述之方法選擇所欲觀看之 字幕語言。 再者’本發明可利用上述方法進行數位電視字幕選擇 15之系統，包含有一字幕資料接收模組，用以接收具有語言 辨識碼之字幕資料；一與字幕資料接收模組連接的字幕切 換模組，以接收上述之語言辨識碼，並依照外界輸入之選 擇訊號選出一語言辨識碼之語言字幕輸出；再藉由一對時 模組將該字幕資料之顯示時間與影像、聲音顯示時間進行 20比對，而輸出一顯示訊號至一字幕顯示模組，將選出的語 言辨識碼所對應之語言字幕顯示出，控制各子頻道之字幕 顯示時間得以配合各節目的影像及聲音適時播出。 【圖式之簡單說明】 本發明之其他技術内容、特徵及優點，在以了配合參 本紙張尺度適用中國國家標準（CNS) A4規格（210x 297公釐） 第5頁 576110 五、發明說明（3 ) ΠΓ較佳實施例的詳細說”，將可清楚的呈現，在 園式τ : 之 圖是本發明數位電視字幕選擇方法較佳實 流程圖； 5 10 15 20 第二圖，第一圖中判斷有無字幕資料之示意圖； ^ 冑是第冑中對時顯示步驟進行字幕顯示時間與 節目資料顯示時間比對之示意圖；及 第四圖是本發明數位電視字幕選擇系統較佳實施例之 示意圖。 【發明之詳細說明】 目别，數位視訊廣播（DVB)標準之數位電視無線廣播 3 ’已提供可在各子頻道之節目中加入多國語言字幕的機 ^而與各節目之影像、聲音資料經過編碼後成為基本資 料流（Elementary stream)，再經過分封（packetiser)分成較小 的封包，而成為Packetised Elementary Stream(以下簡稱 PES)，並將PES送至一傳輸器，做成MpEG_2資料流之一 種負料型態一傳播串流（Transport Stream簡稱TS)傳送，該 傳播串流是由多數個188位元組的傳送封包所組成，而每 一個傳送封包前面四個位元組為檔頭（Header)，後面其他位 元組為荷載（Payload)之部分，於荷載中的資料亦分為兩 種’ 一種是由影像、音頻及文字等元素資料流所組成基本 資料流封包（PES packets)，而字幕資料則是附於該基本資 料流封包中，且是屬於文字元素資料流；荷載中之另一種 資料是節目格式資料（PSI Data)，其具有節目圖表（PMT)、 本紙張尺度適用中國國家標準（CNS) A4規格（210x 297公釐） 第6頁 576110 A7 -------- B7 五、發明說明（4 ) 節目連結表（PAT)，以及其他紀錄節目相關資訊之表單，該 郎目圖表是紀錄每一節目的影像、聲音及資料等元素的辨 識碼，且該辨識碼是用以指示每一節目之影像、聲音及資 料元素於基本資料流封包（PES packets)中的位置；而該節 5目連結表是紀錄系統中系統各種節目的節目編號及與節目 圖表中對應的辨識碼。 另外，上述具有多國語言字幕的DVB標準數位電視的 子幕資料具有紀錄每一子頻道節目各種語言字幕的語言辨 識碼、一定義字幕顯示範圍與時間的頁面編排區段（Page 10 Composition Segment)、一定義該字幕顯示範圍的長度與圖 素相關> sfL之區域編排區段（Regi〇n c〇mp0siti〇n Segment)、一具有定義每一圖素顏色的顏色對照表之區段 (color look-up table definition segment)，及一定義字幕資 料之性質的物件資料區段（〇bject Data segment)。 15 上述是對於目前DVB標準之數位電視無線廣播站所傳 送出的資料型態與字幕資料作概略之說明，以使熟習該技 術領域之人士能先瞭解本發明運用在DVB標準數位電視上 之選擇字幕的技術背景，而能更進一步能輕易暸解下面所 述的本發明應用在DVB標準之數位電視的具體實施例。 20 本發明數位電視字幕選擇方法及系統，是在發送端之 無線廣播站送出多種語言之字幕資料時，才可供使用者進 行選擇所欲觀看之語言字幕，進而顯示。所以本發明進行 之流程如第一圖所示，首先是以步驟31，接收無線廣播站 輸出包含有複數個子頻道之節目資訊所形成的數位訊號， 本紙張尺度適用中國國家標準（CNS) A4規格（21〇x 297公餐) 第7頁 576110 A7 ____B7 五、發明說明C 5 ) 且該數位訊號是以DVB標準之傳輸格式（傳播串流TS)傳 送，當然，步驟3 1所接收之數位訊號的内容及形態就如上 面所述，包含有檔頭及荷載兩部分，且荷載中具有各個節 目資料的基本為料封包（PES packets)與節目格式資料（pSI 5 Data)，已於上面敘述中介紹過，所以在此不再一一敘述。 當使用者選到一頻道中的一節目，即一子頻道，則進 行步驟32,判斷有無字幕資料，其過程請參閱第二圖所示， 由該數位訊號之節目格式資料PSI (圖中標示321)中該節目 之編號PID，本實施例中所選節目的psi編號為〇，並依此 10編號找到對應之節目連結表PAT(圖中標示322)，再根據節 目連結表322中所紀錄該節目的辨識碼pMT piD(在本實施 例中所紀錄的辨識碼為〇 1)，取回辨識碼pMT piD所對應 之節目圖表323,並將該節目圖表323中之資訊分類成圖中 所示之影像（Video)、音頻（Audi0)，及文字（Data)元素再 15依節目圖表323中該節目之資料元素的辨識碼piD 〇4，以 可得到此節目之文字元素324於基本資料流封包（pEs packets)中的位置，進而擷取出文字元素，分析是否具有字 幕資料’當判斷出具有字幕資料時，則將該字幕資料取出， 則於步驟33中，得以接收到字幕資料。若沒有字幕資料則 20此流程停止，而無法進行選擇字幕之動作，待使用者轉至 經上述流程判斷出具有字幕資料的另一子頻道時，則可進 行下面之流程。另外，在使用者選到一節目時，除了進行 步驟32判斷有無字幕資料之動作外，亦同時將基本資料流 封包（PES packets)中該節目之影像資料325、音頻資料Another object of the present invention is to provide a method capable of displaying subtitles at an appropriate time in accordance with the time of channel switching and 2 broadcasting of programs, and the method for selecting digital television subtitles of the present invention is in wireless broadcasting 5 = The sending end sends the subtitle data stream, and when receiving the subtitle data at the receiving end, the subtitle language can be selected by using the present invention. The method includes the steps of receiving the subtitle data, and the received subtitle data has a variety of records and programs. A language identification code for language subtitles; a receiving selection signal step, receiving a user inputting a selection signal for a desired subtitle language, and selecting one of the language identification codes according to the 10 selection signals; finally, in a subtitle displaying step, The language subtitles corresponding to the selected language identification code are displayed; therefore, in each sub-channel program, the subtitle language to be watched is selected according to the method described above. Furthermore, the present invention can use the above method to perform digital television subtitle selection system 15. It includes a subtitle data receiving module for receiving subtitle data with a language identification code; a subtitle switching module connected to the subtitle data receiving module In order to receive the above-mentioned language identification code, and select a language subtitle for the language subtitle output according to the externally input selection signal, and then use a pair of time modules to compare the display time of the subtitle data with the video and audio display time by 20 Yes, and output a display signal to a subtitle display module to display the language subtitles corresponding to the selected language identification code, and control the subtitle display time of each sub-channel to be broadcast in time with the video and sound of each program. [Brief description of the drawings] Other technical contents, features and advantages of the present invention are adapted to the Chinese paper standard (CNS) A4 specification (210x 297 mm) in accordance with the paper size of the reference. Page 5 576110 V. Description of the invention ( 3) The detailed description of the preferred embodiment of "ΠΓ" will be clearly presented. In the garden-style τ: the diagram is a preferred flowchart of the digital television subtitle selection method of the present invention; 5 10 15 20 second diagram, first diagram ^ 胄 is a schematic diagram of comparing the subtitle display time with the program data display time in the second time display step; and the fourth diagram is a schematic diagram of the preferred embodiment of the digital television subtitle selection system of the present invention [Detailed description of the invention] For the purpose, digital video broadcasting (DVB) standard digital TV wireless broadcasting 3 'has provided a machine that can add subtitles in multiple languages to the programs of each sub-channel, and the video and sound of each program The data is encoded into an elementary stream, which is then divided into smaller packets through packetiser, and becomes a Packetised Elementary Stream (using (Referred to as PES), and send the PES to a transmitter to make a negative type of MpEG_2 data stream-Transport Stream (TS) for transmission, which is transmitted by a majority of 188 bytes It is composed of packets, and the first four bytes of each transmission packet are headers, and the other bytes are the payload part. The data in the payload is also divided into two types. Elementary data stream (PES packets) composed of elementary data streams such as audio, audio, and text, and subtitle data is attached to the elementary data stream packet and belongs to the textual element data stream; another type of data in the payload is the program format Data (PSI Data), which has a program chart (PMT), this paper size applies Chinese National Standard (CNS) A4 specifications (210x 297 mm) Page 6 576110 A7 -------- B7 V. Description of the invention (4) Program link table (PAT) and other forms for recording program-related information. The Langmu chart is an identification code that records the video, audio, and data elements of each program, and the identification code is used to indicate each section. The position of the video, audio and data elements in the PES packets; and the 5 item link table in this section is the program number of the various programs in the recording system and the identification code corresponding to the program chart. In addition, the above Sub-screen data of DVB standard digital TV with multi-language subtitles has a language identification code that records subtitles in each language of each sub-channel program, a page composition segment (Page 10 Composition Segment) that defines the subtitle display range and time, and a definition The length of the subtitle display range is pixel-dependent.> SfL's region layout segment (Regi〇nc〇mp0siti〇n Segment), a segment with a color look-up table defining the color of each pixel (color look-up table definition segment), and an object data segment that defines the nature of the subtitle data. 15 The above is a brief description of the data types and subtitle data transmitted by the current digital television wireless broadcast stations of the DVB standard, so that those skilled in the technical field can first understand the choices of the present invention applied to the DVB standard digital television. The technical background of subtitles, and can further understand the specific embodiments of the digital television of the present invention applied to the DVB standard described below. 20 The digital television subtitle selection method and system of the present invention are only available when the wireless broadcast station on the transmitting end sends subtitle data in multiple languages, so that the user can select the language subtitle to watch and display it. Therefore, the process of the present invention is as shown in the first figure. First, in step 31, the digital signal formed by the wireless broadcast station outputting the program information including a plurality of sub-channels is received. This paper size applies the Chinese National Standard (CNS) A4 specification. (21〇x 297 meals) Page 7 576110 A7 ____B7 V. Description of the invention C 5) And the digital signal is transmitted in the DVB standard transmission format (transmission stream TS). Of course, the digital signal received in step 3 1 The content and form are as described above, including the header and the load, and the program information in the load is basically PES packets and program format data (pSI 5 Data), which have been described above. It has been introduced, so it will not be described one by one here. When the user selects a program in a channel, that is, a sub-channel, then proceed to step 32 to determine whether there is subtitle data. For the process, please refer to the second figure. The program format data PSI of the digital signal (labeled in the figure) 321) of the program number PID, the psi number of the selected program in this embodiment is 0, and the corresponding program link table PAT (labeled 322 in the figure) is found based on the 10 number, and then recorded in the program link table 322 The program identification code pMT piD (the identification code recorded in this embodiment is 0), retrieve the program chart 323 corresponding to the identification code pMT piD, and classify the information in the program chart 323 into The displayed video (Video), audio (Audi0), and text (Data) elements are then 15 according to the identification code piD 〇4 of the data element of the program in the program chart 323 to obtain the text element 324 of the program in the basic data stream. Position in the packet (pEs packets), and then extract text elements and analyze whether there is subtitle data. When it is determined that there is subtitle data, the subtitle data is taken out, and in step 33, the subtitle data can be received. If there is no subtitle data, then this process stops, and the action of selecting subtitles cannot be performed. When the user transfers to another sub-channel that is determined to have subtitle data through the above process, the following process can be performed. In addition, when the user selects a program, in addition to the action of determining whether there is subtitle data in step 32, the program also includes the image data 325 and audio data of the program in the basic data stream (PES packets).
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之:’其節目播出之處理過程為現有之㈣h 之重：，所以在此不再詳細說明。有之技術’且非本發明 當使用者以遙控器 行步驟34，啟動^ 一 、雨一顯示字幕訊號，則進 5 幕語言選擇表„子顯不功能，而於電視螢幕上顯示出字 字幕，則2二該節目具有中、英、曰文三種語言 使用者選擇， 中”肩不出三種語言字幕以供 言辨識碼所子頻道之每-種語言所代表的語 的代碼，例如卜2=辨識碼即為代表每-種語言字幕 進行步驟35，解出刀別代表中文、英文、日文，接著， 語言_ 解出料頻道之字幕資料，分別㈣每一種 前、背哥海“興伶邊時間、位置、長寬、物件，及 所解出I;暮“字幕相關資料’再於步㈣，分別將上述 儲存，以文字或圖形檀案形式儲存。 (如中田文H進行步驟37,輸人選擇表單中其—字幕語言 而選出中文字η即可對應至中文字幕的語言辨識碼， 料，最二 出上述所儲存的中文字幕之構案資 昭字幕顯-4不步驟38，利用第三圖所示之方式，依 ⑽子=不時間之區塊381上所紀錄每一字幕出現的 (即£塊3 81上印料从《c ] 上、、己錄的5、5、…·、U、η、….、25、 與節目資料顯示時間進行比對，並令此子頻道節目開始顯 間為1下一時間依序為2、3、4、…，隨著節 播放同時進打時間的計數，即如區塊382所示，區塊M2 中之數字代表節目播出時’在每間格1秒之計數，當區塊 382之節目播映至5時’則區塊381中標$ 5的所有字幕同 20 57611〇Zhi: ’The process of broadcasting the program is the most important one: so it will not be described in detail here. Some technologies' and not the present invention. When the user uses the remote control to perform step 34 and activates ^ 1. Rain 1 displays the subtitle signal, then enters the 5-screen language selection table „Sub-display function, and displays the subtitle on the TV screen. Then, the program has Chinese, English, and Japanese languages for users to choose. The Chinese language ca n’t shoulder subtitles in three languages to provide a code for the language represented by each language of the subchannels identified by the identification code. = The identification code is to perform step 35 on behalf of the subtitles in each language, and to extract the subtitles representing Chinese, English, and Japanese. Then, the language_Understand the subtitle data of the material channel, and ㈣ each front and back brother "Xing Ling" Side time, location, length and width, objects, and the solution I; twilight "subtitle-related data" and then step by step, respectively, save the above, in the form of text or graphics. (Such as Nakata H. Go to step 37. Enter the subtitle language in the input selection form and select the Chinese character η to correspond to the language identification code of Chinese subtitles. It is expected that the stored Chinese subtitles will be the second most significant. The subtitle display-4 does not go to step 38. Using the method shown in the third figure, each subtitle recorded on the block 381 according to Xunzi = Timelessness appears (that is, the printed material on the block 3 81 is from "c", , The recorded 5, 5, ..., U, η, ...., 25, and the program data display time to compare, and make this sub-channel program start time between 1 and next time sequentially 2, 3, 4, ..., the count of the time of simultaneous play as the festival is played, that is, as shown in block 382, the number in block M2 represents the time of the program's broadcast 'counting at 1 second in each box, when the program in block 382 At 5 o'clock, then all subtitles of $ 5 won in block 381 are the same as 20 57611.
576110576110
字幕切換模組44與一字幕顯示部45。 該字幕顯示部45包含有一字幕解碼單元45丨、播映時 間標示模組452、一與字幕解碼單元451之輸出端連接的儲 存模組453、一連接於儲存模組453輸出端的圖形處理模組 5 454、一與該播映時間標示模組452連接的對時模組456， 及一分別連接於圖形處理模組454與對時模組456與字幕 切換模組44之輸出端的字幕顯示模組455。 該字幕解碼單元45 1包含有一可解出字幕資料中定義 字幕顯不範圍及時間的頁面編排解碼模組45丨a、一可解出 10子幕為料中定義字幕顯不範圍的長度與圖素相關資料的區 域編排解碼模組45 lb、一可解出字幕資料中每一圖素顏色 的顏色對照解碼模組451c，及一可解出字幕資料之性質的 物件資料解碼模組45 1 d。 另外，上述之對時模組456更外接至一 STc(System Time Clock)模組6，該STC模組6是根據所接收之傳播串 流中讓影像與聲音同步之時間參考資料（咖），經視訊轉換 盒（Set-top Box)修正及補償後產生一個參考時間標準，提供 給視訊轉換盒作為資料處理及傳送之參考時間桿準。 15 當使用者選擇其中一子頻道時’該字幕索引模組則 可接收該子頻道節目資才斗’並在傳播串流中，掏取出節目 圖表之資訊，並依該節目圖表中的辨識碼將其資訊分類 成音頻、影像及文字各類元素’並輸出—指示訊號^ 該判讀模組42該文字元素中所紀錄字幕資料的 ： 置。判讀模組42則依照指示訊號，掏取出該位置之字幕辨 20 A7 五、發明說明（9 ) 識碼，並判斷是否有字幕資料，在判斷出具有字幕資料時， 輪出一擷取訊號至該字幕資料接收模組C，將字幕資料取 出。在字幕資料接收模組43取得字幕資料的同時，一方面 通知該圖形處理模組454啟動，另一方面則將該字幕資料 之内谷分類’將該字幕資料中標示各種語言字幕代號的語 言辨識碼送至該字幕切換模組44 ;另外，將字幕資料中顯 不時間輸至該播映時間標示模組452，並且將該字幕顯示相 關資訊，如範圍、圖素、顏色與位置等資訊，輸入至字幕 解碼單元451。 1〇 當使用者以遙控器5輸出一顯示字幕訊號至字幕切換 模組44,則字幕切換模組44輸出一訊號，啟動字幕顯示功 月b，並使子幕顯示模組455顯示出字幕語言選擇表單，以 供使用者在表單上選擇所欲觀看的語言字幕，同時該字幕 切換模組44解出該子頻道之每一種語言所代表的語言辨識 15碼，且由解碼單元451中之各個解碼模組451a、451b、451c、 451d將字幕位置、長度、顏色··等各資訊，解碼形成文字 或圖形之檔案結構，再分別地儲存至儲存模組453中，另 外，該播映時間標示模組452將字幕顯示與停留時間資料 解出，上述之字幕解碼單元45丨中所包含的各解碼模組 20 451a、451b、451c、451d均是依照DVB標準所規定之數位 電視子幕處理系統規格所製作。在使用者以遙控器輸入選 擇其一語言字幕的選擇訊號至該字幕切換模組44，該選擇 訊號所對應之語言辨識碼則被選出，而輸出至字幕顯示模 組455,再通知該圖形處理模組454至儲存模組453取出所 本紙張尺度適用中國國家標準（CNS) A4規格（21〇x 297公釐） -------- 第12頁 B7 五、發明說明（10 =:提幕:的?广，同時該對時模組456依…模 顯干考時間作標準，進行比對該字幕資料中之 顯不時間與該子頻道之影像 诚筮-国士士 1 车日顯不的時間，並依照上 述第二圖之方式，在該子頻道 ^ ^ ^ ^ ^ - * 、之〜像、聲音顯示時間大於 寺於子幕顯不時間時，則輪屮 „ 4S, 則輸出一顯示訊號至該字幕顯示模 組455，以將字幕顯示出。 歸納上述，本發明數位電 〜曾# 电优子幕選擇方法及系統，在 子幕處理系統中加入多語古牢 夕口0子幕身料解碼與選擇功能，並 10 配=道切換及節目播映之時間，可依使用者所欲觀看之 浯a子幕於適當時間顯示，確實達到本發明之目的。 惟以上所述者，僅為本發明之較佳實施例而已，當不 月包以此限定本發明會絲夕益阁 卜 货3貫施之靶圍，即大凡依本發明申請專利 祀圍及發明說明書内容所作之簡單的等效變化與修飾，皆 應仍屬本發明專利涵蓋之範圍内。 本紙張尺度適用中國國家標準（CNS) A4規格（210χ 297公釐） 第13頁 576110 五、發明說明（11 ) 元件標號對照】 3 1〜38步驟 322節目連結表 324 PES中之文字資料 326 PES中之音頻資料 381字幕顯示時間之區塊 3 82節目播放之計時區塊 4字幕選擇系統 42判讀模組 44字幕切換模组 451字幕解碼單元 4 5 1 b區域編排解碼模組 45 Id物件資料編碼模組 4 5 3儲存模組 456對時模組 5遙控器 3 2 1節目格式資料 323節目圖表 325 PES中之影像資料 41字幕索引模組 43字幕資料接收模組 4 5字幕顯示部 4 5 1 a頁面編排解碼模組 45 1c顏色對照解碼模組 452播映時間標示模組 4 5 4圖形處理模組 455字幕顯示模組 6 STC模組 訂 線 本紙張尺度適用中國國家標準（CNS) A4規格（210x 297公釐） 第14頁The subtitle switching module 44 and a subtitle display unit 45. The caption display unit 45 includes a caption decoding unit 45, a play time marking module 452, a storage module 453 connected to the output terminal of the caption decoding unit 451, and a graphics processing module 5 connected to the output terminal of the storage module 453. 454. A time synchronization module 456 connected to the show time indication module 452, and a subtitle display module 455 connected to the output terminals of the graphics processing module 454, the time synchronization module 456, and the subtitle switching module 44 respectively. The subtitle decoding unit 45 1 includes a page layout decoding module 45 which can solve the subtitle display range and time defined in the subtitle data, and a sub-screen that can solve the length and figure of the subtitle display range defined in the material. 45 lb for regional arrangement and decoding of prime-related data, a color contrast decoding module 451c that can extract the color of each pixel in the subtitle data, and an object data decoding module 45 1 d that can extract the properties of the subtitle data . In addition, the above-mentioned time synchronization module 456 is further connected to an STc (System Time Clock) module 6, which is based on the time reference data (coffee) for synchronizing the image and sound in the received broadcast stream. After being corrected and compensated by the set-top box, a reference time standard is generated, which is provided to the set-top box as a reference time bar for data processing and transmission. 15 When the user selects one of the sub-channels, 'the subtitle index module can receive the program information of the sub-channel', and in the broadcast stream, extract the information of the program chart, and use the identification code in the program chart The information is classified into various elements of audio, video, and text 'and output-indicating signals ^ The interpretation module 42 subtitle data recorded in the text element: Set. The reading module 42 takes out the subtitle identification at the location according to the instruction signal. 20 A7 V. Description of the invention (9) Identification code, and determine whether there is subtitle data. When it is judged that there is subtitle data, it turns out a capture signal to The subtitle data receiving module C takes out the subtitle data. When the subtitle data receiving module 43 obtains the subtitle data, on the one hand, it informs the graphics processing module 454 to start, and on the other hand, it classifies the inner valley of the subtitle data. The code is sent to the caption switching module 44; In addition, the time displayed in the caption data is input to the play time labeling module 452, and the caption is displayed with related information, such as range, picture element, color, and position information, and input To subtitle decoding unit 451. 10. When the user outputs a display subtitle signal to the subtitle switching module 44 with the remote control 5, the subtitle switching module 44 outputs a signal, activates the subtitle display function b, and causes the sub-screen display module 455 to display the subtitle language. Choose a form for the user to select the language subtitles they want to watch on the form. At the same time, the subtitle switching module 44 decodes the language identification 15 codes represented by each language of the sub-channel, and each of them is decoded by the decoding unit 451. Decoding modules 451a, 451b, 451c, and 451d decode subtitle position, length, color, and other information to form a file structure of text or graphics, and then store them in the storage module 453 separately. In addition, the broadcast time marking module Group 452 decodes the subtitle display and dwell time data. Each of the decoding modules 20 451a, 451b, 451c, and 451d included in the above-mentioned subtitle decoding unit 45 丨 are in accordance with the digital TV sub-screen processing system specifications specified by the DVB standard. Made. When the user inputs a selection signal for selecting a language subtitle with the remote control to the subtitle switching module 44, the language identification code corresponding to the selection signal is selected and output to the subtitle display module 455, and then the graphic processing is notified. Module 454 to storage module 453 are taken out. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (21 × 297 mm) -------- Page 7 B7 V. Description of the invention (10 =: Summary: The time is wide, at the same time, the time module 456 is based on the standard time of the dry test, and compares the display time of the subtitle data with the image of the sub-channel sincerely-Guo Shishi 1 Che Rixian Time, and in accordance with the method of the second picture above, when the sub-channel ^ ^ ^ ^ ^-*, its ~ image, sound display time is greater than the display time of the sub-screen, then 屮 „4S, then output A display signal is displayed on the subtitle display module 455 to display the subtitles. In summary, the above-mentioned digital electricity ~ Zeng # electricity excellent sub-curtain selection method and system are added to the sub-curtain processing system. Sub-screen body decoding and selection function, and 10 matching = channel switching and programs The display time can be displayed at an appropriate time according to the user's desire to watch the sub-screen, which really achieves the purpose of the present invention. However, the above is only a preferred embodiment of the present invention. This defines the target range of the present invention, which can be used in the Sixiyi Pavilion, that is, the simple equivalent changes and modifications made according to the application of the invention and the contents of the description of the invention should still be covered by the invention patent. This paper size applies to the Chinese National Standard (CNS) A4 specification (210 x 297 mm) Page 13 576110 V. Description of the invention (11) Component label comparison] 3 1 ~ 38 steps 322 Program link table 324 PES text Data 326 Audio data in PES 381 Subtitle display time block 3 82 Timing block for program playback 4 Subtitle selection system 42 Interpretation module 44 Subtitle switching module 451 Subtitle decoding unit 4 5 1 b Region layout decoding module 45 Id Object data encoding module 4 5 3 Storage module 456 Time module 5 Remote control 3 2 1 Program format data 323 Program chart 325 Video data in PES 41 Subtitle index module 43 Subtitle data receiving module 4 5 Subtitle display section 4 5 1 a Page layout decoding module 45 1c Color contrast decoding module 452 Showtime marking module 4 5 4 Graphic processing module 455 Subtitle display module 6 STC module alignment National Standard (CNS) A4 Specification (210x 297 mm) Page 14