1271100 九、發明說明： 【發明所屬之技術領域】 本發明係有關於垂直空白區間(VBI)，尤指一種偵測 VBI之裝置及方法。 【先前技術】 垂直空白區間(vertical blanking interval，VBI)是電視 訊號中所保留的空白區間，各種使用者資訊可被附加於 VBI中。第1圖係顯示不同電視規格中，各種類型之VBI 所使用的掃描線位置。在NTSC (National Television System Committee)規格中，每個畫面有525條掃描線； PAL ( Phase Alternating Line )規格則是每一晝面有 625 條 掃描線。第1圖顯示了隱藏字幕(Closed Caption，CC)、副 本衍生管理系統(Copy Generation Management System5 CGMS)、寬螢幕訊號(Widescreen Signaling, WSS)、視訊 編程系統(Video Programming System，VPS)及圖文電視 (Teletext, TTX)625B 等不同的 VBI 類型。1271100 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a vertical blanking interval (VBI), and more particularly to an apparatus and method for detecting a VBI. [Prior Art] A vertical blanking interval (VBI) is a blank space reserved in a television signal, and various user information can be attached to the VBI. Figure 1 shows the scan line positions used by various types of VBIs in different TV specifications. In the NTSC (National Television System Committee) specification, there are 525 scan lines per picture; the PAL (Phase Alternating Line) specification has 625 scan lines per side. Figure 1 shows Closed Caption (CC), Copy Generation Management System 5 (CGMS), Widescreen Signaling (WSS), Video Programming System (VPS), and Teletext Different VBI types (Teletext, TTX) 625B.
第2圖係一典型VBI訊號之示意圖。如第2圖所示， 一條掃描線所包含的VBI訊號依序具有下列部分：水平 同步訊號(1%11(〇、繫色((；〇1〇1^11悦)訊號、前導時脈((：1〇(± run-in)訊號、視框碼(frame code)及資料部分。其中，不同 的VBI類型具有不同的前導時脈訊號與視框碼。習知的 VBI解碼器係依據電視訊號中VBI訊號出現的掃描線位 置來設定，例如，接收到第幾條掃描線時開始進行VBI 1271100 解碼。並且，對於每—條有VBI訊號出現的掃描線，習 知聰解挪_分_歧定其vm _之對應規格 參數，才能正確地進行解碼。 所以，在f用技術巾，需絲知道有VBI訊號出現 的掃描線位置及VBI訊號之類型，先做好相關設定，後 續才能正確進行VBI的解碼。如此，使用時極為不便， 且缺乏應用上的彈性。 【發明内容】 因此，本發明之一目的，在於提供一種VBI偵測裝 置及方法，其可自動偵測VBI訊號的存在及其類型，作 為後續進行VBI解碼的依據。 本發明之一目的，在於提供一種VBI偵測裝置及方 法其不需預知含VBI訊號的掃描線位置，而可自動偵 測任何掃描線位置出現的VBI訊號，以增加應用上的彈 性。 依據本發明之一實施例，其係揭露一種VBI偵測裝 置，其包含有：一數位化模組，依據一準位值，將電視訊 號轉換成數位化訊號；及一偵測模組，麵接至數位化單 兀’用以偵測該數位化訊號是否為一 VBI訊號，若是， 則進一步鉀斷該VBI訊號之類型。 依據本發明之一實施例，其係揭露一種VBI偵測方 法，其包含有：依據一準位值，將電視訊號轉換為數位化 汛唬，偵測該數位化訊號是否為一 VBI訊號；以及若該 1271100 數位化訊號為該VBI訊號，判斷該vbI訊號之類型。 【實施方式】 請參閱第3圖，其係本發明之vbi偵測裝置3〇之方 塊圖。VBI偵測裝置30係用以自動偵測電視訊號中，任 何掃描線位置出現的VBI訊號，並判斷其VBI類型，如 CC、CGMS、WSS、VPS、TTX625B 等類型。如第 3 圖 所示’ VBI偵測裝置30包含複數個數位化模組31、複數 個偵測模組32及雜訊濾波器33。雜訊濾波器33接收電 視訊號，並濾除其中高頻的雜訊，然後將濾波後的電視訊 號分別送入該複數個數位化模組31。前述電視訊號可為 CVBS訊號、Y/C訊號、VGA訊號或γ/Pb/Pr訊號。接著， 該些數位化模組31分別依據對應不同類型VBI訊號之準 位值，將濾、除雜訊之電視訊號數位化(出幽细幻，亦即高 於该準位值者即視為1，反之則視為〇，藉以產生複數個 數位化訊號。該準位值之決定方式並無限制，因此，該準 位值可為預設之固定值，亦可為因應實際接收之電視訊號 而動態調整之值，例如，若電視訊號包含有視框碼，則可 依據该視框碼所對應之訊號強度來決定準位值。在一實施 例中，如述a亥些數位化模組31係整合為一，以依據預設 之固定準位值或動態破之準錄，_顧之電視訊號 轉成數位化訊號。 第3圖中，該複數個偵測模組32從該些數位化模組 31分別接收該些數位化訊號，並分別判斷其中是否包含 1271100 視框碼右可解出任何視框碼，則進一步將其與各VBi 類型之視框碼做比對。各種常見Vgj類型之視框碼如第4 圖所不，圖中b表二進位值，h表十六進位值。若比對後 發現所解出之視框碼與任一種yg〗類型之視框碼(不限於 第4圖所列)一致’則判斷所接收之電視訊號包含有聰 訊號’同時亦得知其為何種VBI類型。若電視訊號包含 vm訊號，則將該聰訊號送至資料分割器(data slice顧 未顯進行後續處理。請注意，第3圖中，所使用之數 位化模，、且31與偵測模組％的數量，係依所要偵測之乂別 類型而定。在—實施例中，係使用一組數位化模組31盥 偵測模組32，以偵測-或數種特定類型之彻訊號。 第3圖之實施例巾，在整個VBI偵測裝置3〇運作過 ^田去分騎魏之魏域為·掃描線，而 ⑴述方式’自動偵_在任何掃描線出現的VBI °此外’在制過程中’侦測模組32係依 __ ’此預定時間係依據所要侧之 而疋’舉例而言，偵測模組32可輪接至一叶數 於圖中)，該計數器可由電視訊號之水平同步 j概及重置，藉以開始計數一參考時脈之時脈數， 糾脈數之乡寡係鱗要侧之侧 特定時_= 32 ’使其開始執行:貞:數挪發运-訊號至偵測模組 第5圖係本發明之VBI偵測裳置知之方塊圖。與第 1271100 3圖她，主要差異點在於VBI偵姆置％ +，每一數 位化模組5i還包含前導時脈侧單元m，刻貞測電視 訊號是否包讀導時脈職。若包含前料脈訊號，表示 電視訊號可能内含vm訊號，此時數位化模組51會進行 將電視訊賴換成數位化訊號_作。請注意，無前 脈訊號之f視峨亦可能為彻訊號，如cgms訊號。 因此，在第5圖中，亦可依據實際所要_的VBI類型， 搭配使用無前導時脈偵測單元511之數位化模組。在一實 施例中’料時脈侧單心㈣包含第-_單元及計 ΐΐ元。第二貞測單元係依據電視訊號產生侧訊號，計 开單元則。丨异此細彳訊號之斜率，藉以判斷電視訊號是否 包含則導時脈訊號’且第—侧單元可進—步依據前導時 =訊號鎖定-直流(Dc)電壓值，以作為數位化模組51所 需之準位值，例如依據前導時脈訊麟應賴1及邏輯〇 之值來決準錄。單元及計算單元之原理及 運作方式係揭露於本案申請人之巾華民國專利申請案第 094121572就「垂直空白區間偵測裝置及方法」，於此不 再贅述。 、“第6 ®係本發明之谓_方法之—較佳實施例的 流程圖。如第6圖所示，此流程包含下列步驟： 步驟61 ··依據一準位值，將電視訊號轉換為數位化 訊號； 步驟62 :偵測數位化訊號是否包含視框碼，若是則 執行步驟63，否則跳回步驟61; 1271100Figure 2 is a schematic diagram of a typical VBI signal. As shown in Figure 2, the VBI signal contained in one scan line has the following parts: horizontal sync signal (1%11 (〇, 系1〇1^11悦) signal, leading clock ( (:1〇(± run-in) signal, frame code and data part. Among them, different VBI types have different leading clock signals and frame codes. The conventional VBI decoder is based on TV. The position of the scan line where the VBI signal appears in the signal is set, for example, when the first scan line is received, the VBI 1271100 is decoded, and for each scan line with the VBI signal appearing, the learned line is resolved. The corresponding specification parameters of vm_ can be correctly decoded. Therefore, in the technical towel for f, it is necessary to know the type of scan line and the type of VBI signal in which the VBI signal appears, and then make relevant settings first, and then the VBI can be correctly performed. Therefore, it is extremely inconvenient to use and lacks flexibility in application. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a VBI detecting apparatus and method that can automatically detect the presence of a VBI signal and Type, made A basis for subsequent VBI decoding. One object of the present invention is to provide a VBI detecting apparatus and method that can automatically detect the position of a scan line containing a VBI signal, and can automatically detect a VBI signal appearing at any scan line position to increase The flexibility of the application. According to an embodiment of the present invention, a VBI detecting apparatus includes: a digitizing module that converts a television signal into a digitized signal according to a level value; and The measuring module is connected to the digitizing unit to detect whether the digitized signal is a VBI signal, and if so, further types the type of the VBI signal. According to an embodiment of the present invention, a method is disclosed. The VBI detection method includes: converting a television signal into a digitized signal according to a level value, detecting whether the digitized signal is a VBI signal; and determining if the 1271100 digitized signal is the VBI signal; The type of the vbI signal is used. [Embodiment] Please refer to FIG. 3, which is a block diagram of the vbi detecting device of the present invention. The VBI detecting device 30 is used for automatically detecting a television signal. The VBI signal appears at any scan line position and determines its VBI type, such as CC, CGMS, WSS, VPS, TTX625B, etc. As shown in Figure 3, the VBI detection device 30 includes a plurality of digital modules 31, plural The detection module 32 and the noise filter 33. The noise filter 33 receives the television signal, filters out the high frequency noise, and then sends the filtered television signal to the plurality of digital modules 31. The foregoing television signal may be a CVBS signal, a Y/C signal, a VGA signal or a γ/Pb/Pr signal. Then, the digitizing modules 31 respectively filter and remove the impurities according to the level values of the different types of VBI signals. The digital signal of the TV is digitized (that is, the illusion is higher, that is, the one above the level is regarded as 1 and the opposite is regarded as 〇, thereby generating a plurality of digitized signals. There is no limit to the method for determining the level value. Therefore, the level value can be a preset fixed value or a value that is dynamically adjusted according to the actual received television signal. For example, if the television signal includes a frame code , the level value can be determined according to the signal strength corresponding to the frame code. In one embodiment, the digital display module 31 is integrated into one to convert the television signal into a digital signal according to a preset fixed level value or a dynamic break record. In FIG. 3, the plurality of detection modules 32 respectively receive the digitized signals from the digitization modules 31, and respectively determine whether the 1271100 view frame code is right to solve any frame code, and then further Compare it to the frame code of each VBi type. The frame codes of various common Vgj types are as shown in Fig. 4, in the figure, the table b binary value, the h table hexadecimal value. If the frame code obtained by the comparison is found to be consistent with any of the frame codes of the yg type (not limited to the one shown in FIG. 4), it is judged that the received television signal contains the Conghao number and also knows that For what type of VBI. If the TV signal contains a vm signal, the smart signal is sent to the data splitter (data slice is not displayed for subsequent processing. Please note that in the third figure, the digital model used, and 31 and the detection module The number of % depends on the type of screening to be detected. In the embodiment, a set of digital modules 31 is used to detect the module 32 to detect - or a plurality of specific types of signals. In the embodiment of Fig. 3, the entire VBI detecting device 3 has been operated by the field to divide the Wei Wei area into the scanning line, and (1) the method of 'automatic detection' appears in any scanning line VBI ° In the process of the process, the detection module 32 is based on the __', and the predetermined time is based on the desired side. For example, the detection module 32 can be rotated to a leaf number in the figure. It can be reset by the horizontal synchronization of the TV signal, so as to start counting the number of clocks of a reference clock, and the side of the correction pulse is to be side-specific _= 32 'to make it start: 贞: The digital transmission-signal-to-detection module picture 5 is a block diagram of the VBI detection of the present invention. In contrast to the 1271100 3, the main difference is that the VBI Detector sets % +, and each digitization module 5i also includes a leading clock-side unit m, which inspects whether the TV signal is read or not. If the pre-sense signal is included, it indicates that the TV signal may contain a vm signal, and the digital module 51 will perform the conversion of the television signal into a digital signal. Please note that a video with no preamble may also be a signal, such as a cgms signal. Therefore, in FIG. 5, the digitalization module without the preamble clock detecting unit 511 can also be used in accordance with the actual VBI type. In one embodiment, the "single clock center" (4) contains the -th unit and the unit. The second detection unit generates a side signal according to the television signal, and counts the unit. The slope of this detailed signal is used to determine whether the TV signal contains a clock signal and the first-side unit can advance according to the preamble = signal lock-DC (Dc) voltage value as a digital module. The required level value of 51, for example, is determined based on the value of the preamble clock and the logical value. The principle and operation mode of the unit and the calculation unit are disclosed in the applicant's patent application No. 094121572, the "Vertical Blank Space Detection Device and Method", which will not be repeated here. "6th ® is a flowchart of the preferred embodiment of the present invention. As shown in FIG. 6, the flow includes the following steps: Step 61 · Convert a television signal to a level value Digitizing signal; Step 62: detecting whether the digitized signal includes a frame code, if yes, executing step 63, otherwise jumping back to step 61; 1271100
步驟63 :依據該視框碼判斷電視訊號是否包含VBI 訊唬，若是則執行步驟64，否則跳回步驟 61； 步驟64 :依據該視框碼判斷該VBI訊號之類型。Step 63: Determine whether the TV signal includes the VBI signal according to the frame code, if yes, execute step 64, otherwise, jump back to step 61; Step 64: Determine the type of the VBI signal according to the view frame code.
在一實施例中，於步驟61前，先判斷電視訊號是否 包含前導時脈訊號，若包含，表示電視訊號可能内含VBI 訊號，才繼續執行步驟61。在另—實施射，依據電視 訊號產生偵測訊號，並計算此偵測訊號之斜率，藉以判斷 電視訊號是否包含前導時脈訊號。若判斷電視訊號包含有 前導時脈訊號，則依據該前導時脈訊號鎖定一直流(Dc) 電壓值，以產生步驟61所需之準位值，例如依據前導時 脈訊號對應邏輯1及 〇之值來決定—準位值。前述準 位值之產生方式請見前揭巾華民國專利申請案第 094121572號，於此不再贅述。In an embodiment, before step 61, it is determined whether the television signal includes a leading clock signal. If it is included, it indicates that the television signal may contain a VBI signal, and then step 61 is continued. In another implementation, the detection signal is generated according to the television signal, and the slope of the detection signal is calculated to determine whether the television signal includes the leading clock signal. If it is determined that the television signal includes the leading pulse signal, the DC signal voltage is locked according to the leading pulse signal to generate the level value required by step 61, for example, according to the leading clock signal corresponding to logic 1 and The value is determined - the level value. For the method of generating the above-mentioned level value, please refer to the patent application No. 094121572, which is hereby incorporated by reference.
以上所述係細較佳實_詳細酬本發明，而非限 制本發明之侧。大凡熟知此類技藝人士皆能明瞭，適當 而作些微的改變及調整，仍將不失本發明之要義所在，亦 不脫離本發明之精神和範圍。 【圖式簡單說明】 第1圖係各種VBI類型所使用的掃描線位置。 第2圖係-典型她訊號之示意圖。 第3圖係本發明之彻彳貞測裝置之—較佳實施例的方塊 1271100 圖。 第4圖係顯示各種常見ye〗類型之視框碼。 第5圖係本發明之VBI偵測裝置之另—較佳實施例的方 塊圖。 第6圖係本發明之VBI侧方法之一較佳實施例的流程 圖。 【主要元件符號說明】 30、50 ·· VBI谓測裝置 ' 51 :數位化模組 32 :偵測模組 33 ·雜訊濾波器 511 ·前導時脈偵測單元 61〜64 · VBI偵測方法之一較佳實施例的流程The above is a better embodiment of the invention, and is not intended to limit the invention. It will be apparent to those skilled in the art that such modifications and adaptations may be made without departing from the spirit and scope of the invention. [Simple description of the drawing] Figure 1 shows the position of the scanning line used by various VBI types. Figure 2 is a schematic diagram of a typical her signal. Figure 3 is a block diagram of a preferred embodiment of the present invention, block 1271100. Figure 4 shows the frame codes of various common ye types. Figure 5 is a block diagram of another preferred embodiment of the VBI detecting device of the present invention. Figure 6 is a flow diagram of a preferred embodiment of the VBI side method of the present invention. [Main component symbol description] 30, 50 ·· VBI pre-measurement device ' 51 : digitalization module 32 : detection module 33 · noise filter 511 · preamble clock detection unit 61 to 64 · VBI detection method Process of one preferred embodiment