1307083 :九、發明說明： ' 【發明所屬之技術領域】 此發明是一種DVD-RAM光碟格式的資料偵測系統，待 別是根據DVD-RAM光碟格式之預同步數據，發出一個假的 同步脈衝信號，來幫助光碟機解碼。 【先前技術】 數位多功能光碟片（digital versatile disc，DVD) _ 具有高容量、高晝質等規格，不論應用在大型檔案的備份 儲存’或是影音資料的記錄與播放，均為當前市場上的最 佳方案。數位多功能光碟片格式之規格包含了 DVD-ROM(digital versatile disk read only memory)以 及 DVD-RAM(digital versatile disk random access memory)等。 第1圖為DVD-RAM的資料執格式，該資料軌上分成數 • 個區段（Sector)，每一區段都由標頭區（Header)及記錄區 (Recording Area)等所組成，其中標頭區為製造光碟片時 即刻錄在光碟片上，記錄區則為可記錄資料的區域。記錄 區中包含一變頻振盪（variable frequency oscillator， VF03)數據、一預同步（Pre sync，ps)數據、一資料區域 (Data Field)等等攔位，其中資料區域用來記載使用者寫 入的資料，其他的部分則留作保護、識別資料區域等，而 6 1307083 資料區域又可分為26個訊框（frame) ’每一個訊框又由一 同步數據（sync pattern)及一資料塊所組成，其中資料魔 用來存放使用者寫入的資料，同步數據則用以保護資料塊。 請參考第2圖為習知光碟機20之架構圖，以第2圖為 例來說明DVD-RAM格式的解碼原理。習知光碟機2〇包括一 光i s買取頭202、一光碟資料债測系統204及一解碼器 2〇6。光學讀取頭202讀取DVD-RAM格式之光碟片2〇〇中的 來源資料後，則光碟資料偵測系統204根據來源資料偵測 —資料區域中2 6個訊框的同步數據。每當光碟資料偵測系 統204偵測到資料區域中—訊框的同步數據時，則產生一 訊框的同步脈衝錢，純示該訊框之資料料位置，因 此偵測-個資料區域時，會產生26個同步脈衝信號，並輸 出這些同步脈衝信號到解碼器·。最後解碼器施根據 "26個同步脈衝信號與來源資料，來解碼出這個資料區 而習知技術在_⑽區域中的㈣訊框的同步數 义須*“碩區起在後偵測’由於標頭區距離資料逼 ;二如糊過程中有誤差，而無法偵測到資料㈣ 框之—個雜之同步數據時，將導致無法發出第-個If =步脈衝錢，來標示第—個訊框之資料塊的 使件解碼器206無法解瑪出該資料區域。 1307083 . 【發明内容】 光碟!=:本發明提供ι__資料區域之 柄負湘•敍方法，麵法偵咖資料_中】 個訊框之同步數據時，則發出—個傻同步 應輸出的第-個訊框之同步脈衝信號，來炉示^。代替 的第-個訊框之資料塊位置，使解‘哭仍二 域’ 區域。 使解碼為仍可解碼出該資料 本發明揭露一種光碟資料偵測系統，適用於偵測 2讀格式的光碟資料。其中_—讀格式的光碟資料 =括步數據及資料區域，而資料區域包括複數個訊 ==:個訊框又包括-同步數據及一資料塊。此光碟資 =測糸統包括-預同步信號產生器、一假同步信號產生 °°以及一同步信號產生器。當預同步信號產生器偵測到預 同步數據，則產生-預同步脈衝信號。而當假同步信號產 生器接收到麵步脈衝信號，則在—第—特定時間長度u 後’產生一假同步脈衝信號。而當同步信號產生器接收到 預同步脈衝信號後，則每於偵測到複數個訊框的一訊框之 同步數據，產生一個訊框之同步脈衝信號。 "本發明揭露一種訊號產生方法，根據DVD-RAM格式的 光碟資料以產生訊號。其中MD_RAM格式的光碟資料包括 預同步數據及貢料區域，而資料區域包括複數個訊框，每 ^307083 -—個訊框又包括一回半紅& ''包括·# "纽―#料塊。此訊號產生方法 匕括·虽偵測到預同步數據 在子才則座生預同步脈衝信號； 時=2 產生後’產生一時間長度為一第-特定 牛矿u吐—#—特定時間長度的同步_窗：在預同 衝信、 間長度後’產生—假同步脈 墙士，母於债測到複數個訊框中的-訊框之同步數 據4 ’則產生一個同步脈衝信號。 【實施方式】 η考第3圖為依據本發明實施例光碟機別之架構 =^碟機3G包括—光學讀取頭3Q2、—光碟細貞測系 、、先304及-解㉞寫。光學讀取頭柳讀取_侧格 ^之光碟片卿中的來源f料後’則光碟資料_系 '统3 04 母偵测來源貧料的一資料區域，會產生數個訊框的同步脈 衝訊號、-假同步脈衝訊號與—資料區域信號，並輪出到 解碼器306。最後，解碼器寫則根據此數個同步脈衝信 \此假同v脈衝況號與此貧料區域信號，將此資料區域 解碼以下以第4圖與第5圖來詳細說明光碟資料伯測系 統304，及其產生的信號。 第4圖係表示依據本發明實施例光碟資料_系、统 304之架構圖。光碟資料偵測系統3〇4包括一預同步信號 產生器術、-時脈計數器綱、—鎖相迴路⑽咖= 1307083 - l〇〇p，PLL)406、-同步偵測窗產生器彻、一同步信號產 生器410、一訊框計數器412、一假同步信號產生器4U以 及-資料區域信號產生器416。光碟資料债測系統綱所 產生的信號之時序圖如第5圖所示。預同步信號產生器402 根據來源資料制—預同步數據，而預同步數據共有犯位 位兀（channel bit)，其樣式（pa1;tern)為刚〇 〇⑽ 0100 1000 00100001 0010 〇〇〇〇 1000 〇〇1〇 〇〇〇1 〇〇〇〇 〇 當預同步信號產生器402债測到下列四種情況之一時，則 判斷制到預同步數據，並且發出一預同步脈衝信號（即第 5圖之⑷），來通知假同步信號產生器414、同步_窗產 生斋彻、同步信號產生器41()以及資料區域信號產 416。 第—種情況是#_龍式為1_ 1_的8位通道 位心接著偵測到與預同步數據之樣式全部相同的48位通 逞位兀後，立即發出預同步脈衝信號。第二種情況是當偵 測到樣式為1000 _的8位通道位元，接著偵測到鱼預 ]月“4位通迢位兀（即_〇 0100 0100 =_麵）相同的位通道位元時，則在時脈計數 益404計數24個時脈的時間後，發出預同步 三種情況是當偵測到樣式為麵簡的8位通道位元 接著偵剩與_步輯之樣式中的末24位魏位元（即 20 1307083 « :刚〇 looootnoo, Q_相同的24位通道位元時 立即發出預同步脈衝信號。第四種情況是當偵測樣式為 1_ 1GG0的8位通道位元，接㈣剩與預同步數據之 ，式的前6位通道位元（即麵⑴相同的6位通道位元 —則在日守脈汁數盗404計數42個時脈的時間後，發出預 同步，衝信號。其中上述每個時脈由鎖相迴路伽產生。、 一 >饭同义（號產生益414收到預同步脈衝信號，延遲 —第特騎間長度（Τ1)後，假同步信號產生器似產生 :同步脈衝信號(即第5圖的㈦),並且通知訊框計數器 12由1開始計數。 當同步偵測窗產生器彻收到預同步脈衝信號時，則 =長度為第-狀時間長度㈤加上—第二特定時 ::的―同步摘測窗(即第5圖的⑹)。其中第-特 疋知間長度可為時脈計數器2 第二特定_且“士 τ制個犄脈的時間，而 的時門 ^脈計數器212計數不超過90個時脈 ^而3^時脈與90個時脈係由鎖相迴路406產生。 據來IS:號ίί、器410收到預同步脈衝信號後，則根 並於每:福'、: ' 貝料區域中的每—個訊框之同步數據， 則立即二區域中的每-個訊框之同步數據時， 而同步信號產生:並通知訊框計數器412。 410僅在同步偵測窗的時間長度（TUT2) !3〇7083 ••内谓測資料區域中第-個訊框之同步數據。若偵測到第一 個訊框之同步數據時，則同步信號產生器410立即發出一 個同步脈衝信號，並且通知訊框計數器似由！開始計數。 以第5圖為例，第一個訊框之同步數據最快被侧到的位 置，是在同步偵測窗的第—特定時間長度後，其位置在位 $置⑷’而若在同步_窗的第二特"間長度内才㈣測 例如在位置（e)被偵測到時，則立即在位置⑷發出 步脈衝信號。 下來同步^號產生益41 〇繼續偵測資料區域中第2 7到^ 26個訊框之同步數據’每於伯測到-個訊框的同步 ^康日寸’則立即發出一個同步脈衝信號，並且通知訊框計 盗412計數增加1，當計數為26時，則訊框計數哭412 通知資料區域信號產生器416。 =區域信號產生器416用以產生一資料區域信號 信二圖^當資料區域信號產生器416收到預同步脈衝 輯’貝枓區域信號產生器416將資料區域信號由低邏 提升為高邏輯準位⑻，而當訊框計數器412的 261’則通知資料區域信號產生器仙延遲-特定 Y將貝料區域信號由高邏輯準位降回低邏輯準位。 在賢料區域作硖泛丄、严^ 料是資料的位置，即代表此時來源資 的貝料’而在資料區域信號為低邏輯位準的 12 1307083 =置’即代表此時收到的來源資料不是資料區域的資料。 ^解碼器寫可以利用資料區域信號的高低邏輯位準來 找出資料區域的位置。 ^發明在發出步脈彳驗號後，再延遲第—特定時 嶋後，發出假同步脈衝信號，即使在無糊到資料 域中卜個訊框之同步數據時，亦可用假同步脈衝信 ^來取代應發出的第—個訊框之同步脈衝信號，而解碼 根據假同步脈衡信號發出的位置，來解碼資料區 域。而若在假同步脈衝信號發出後，才偵測到第一個訊框 之同步數據，而發出第一個却 弟個汛框之同步脈衝信號時，則解 馬u⑽忽略假同步脈衝信號，而根據第一個訊框之同步 脈衝信號發出的位置，來解碼資料區域。 第6a、6b、6c圖係依據本發明實施例之光碟資料偵測 去之流程圖。光碟資料_方法包括步驟S6G1〜S617。 ^參考第6a、6b圖’光碟資料_方法首先於步驟S601 =一預同步數據，接著於步驟咖中，判斷是否先偵測 1樣式為1酬_的8位通道位元，以及後來偵測到鱼 2步數據之樣式全部相_4δ位通道位元。衫先偵測 [式為酬1000的8位通道位元，以及後來偵測到與 ，同步數狀樣式相_ 48位通道位元時m卩於步驟 S606中，發出一預同步脈衝信號。 13 1307083 若沒有先偵測到樣式為1000 1 000的8位通道位元， 以及後來偵測到與預同步數據之樣式相同的48位通道位 元，則於步驟S603中，判斷是否先偵測到樣式為1000 1000 的8位通道位元，以及後來偵測到與預同步數據之樣式中 的前24位通道位元相同的24位通道位元。若有先偵測到 樣式為1000 1000的8位通道位元，以及後來偵測到與預 同步數據之樣式中的前24位通道位元相同的24位通道位 元，則於步驟S607中累計24時脈，再於步驟S606中發出 預同步脈衝信號。 若沒有先偵測到樣式為1000 1000的8位通道位元， 以及後來偵測到與預同步數據之樣式中的前24位通道位 元相同的24位通道位元，則於步驟S604中，判斷是否先 偵測到樣式為10 0 0 10 0 0的8位通道位元，以及後來彳貞測 到與預同步數據之樣式中的末24位通道位元相同的24位 通道位元。若有先偵測到樣式為1000 1000的8位通道位 元，以及後來偵測到與預同步數據之樣式中的末24位通道 位元相同的24位通道位元，則立即於步驟S606中發出預 同步脈衝信號。 若沒有先偵測到樣式為1000 1000的8位通道位元， 以及後來偵測到與預同步數據之樣式中的末24位通道位 元相同的24位通道位元，則於步驟S605中，判斷是否先 14 1307083 :偵測到樣式為1_ 1000的8位通道位元，以及後來偵測 到與預同步數據之樣式中的前6位通道位元相同的6位通 道位元。若有先偵測到樣式為刪1000的8位通道位元， 以及後來侦測到與預同步數據之樣式中的前6位通道位元 相同的6位通道位元，則於步鄉S6⑽中，累計42時脈， 再於步驟S606中發出預同步脈衝信號。 若沒有先制到樣式為麵！_的8位通道位元， 以及後耗測到與預同步數據之樣式中的前6位通道位元 相同的6位通道位元，則結束光碟資料偵測方法。在步驟 S6〇l中發出預同步脈衝信號後，於步驟侧中將資料區 域^虎設定為高邏輯準位後，接著到步驟S610。 請參考第6c圖，於步驟如〇中偵測資料區域中第一 個訊框之同步數據。接著於步驟S6u中，延遲一第 時間長度（例如32個時脈）輸—假同步脈衝信號，並二 步驟順中判斷是否在—第二特定時間長度㈣測到第於 一個訊框步數據。若有仙m第—個訊框之同步數 據，則立即於步驟Sin q & π r 屬613中發出一同步脈衝信號； 測到第-個訊框之同步數據，則接著於步驟如 、 開始計數。 田— 然後於步驟邮中，偵測資料區域中第2個到 個訊框之时數據。於步驟如6中，每於制到〜個同步 15 1307083 數據時，則發出一個同步脈衝信號並且計數增加一。接著 於步驟S617中當計數為26時，則資料區域信號設定為低 邏輯準位，最後結束光碟資料偵測方法。 雖然本發明之實施例揭露如上，然其並非用以限定本 發明，任何熟悉此項技藝者，在不脫離本發明之精神和範 圍内，當可做些許更動與潤飾，因此本發明之保護範圍當 視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 為使本發明之上述目的、特徵和優點能更明顯易懂， 下文特舉實施例，並配合所附圖示，進行詳細說明如下： 第1圖係DVD-RAM的資料軌格式。 第2圖係習知光碟機20之架構圖。 第3圖係依據本發明實施例光碟機30之架構圖。 第4圖係依據本發明實施例光碟資料偵測系統304之 架構圖。 第5圖係依據本發明之光碟資料偵測系統304所產生 的信號之時序圖。 第6a、6b、6c圖係依據本發明實施例之光碟資料偵測 方法之流程圖。 【主要元件符號說明】 200-DVD-RAM格式之光碟片；202-光學讀取頭；204- 16 1307083 . 光碟資料偵測系統；206-解碼器。 300-DVD-RAM格式之光碟片；302-光學讀取頭；304-光碟資料偵測系統；306-解碼器。 402-預同步信號產生器；404-時脈計數器；406-鎖相 迴路；408-同步偵測窗產生器；410-同步信號產生器；412-訊框計數器；414-假同步信號產生器；416-資料區域信號 產生器。 S601 〜S617-步驟。1307083 : Nine, invention description: 'Technical field of invention】 This invention is a data detection system of DVD-RAM disc format, which sends out a false sync pulse according to the pre-synchronization data of the DVD-RAM disc format. Signal to help the disc player decode. [Prior Art] Digital versatile disc (DVD) _ has high-capacity, high-quality and other specifications, regardless of the application in the backup storage of large files' or the recording and playback of audio and video materials, are currently on the market. The best solution. The specifications of the digital versatile disc format include a DVD-ROM (digital versatile disk read only memory) and a DVD-RAM (digital versatile disk random access memory). The first picture shows the data format of the DVD-RAM. The data track is divided into several sectors, each of which is composed of a header and a recording area. The middle header area is recorded on the optical disc when the optical disc is manufactured, and the recording area is an area in which the data can be recorded. The recording area includes a variable frequency oscillator (VF03) data, a pre-sync (ps) data, a data field, and the like, wherein the data area is used to record the user's write. The data, other parts are reserved for protection, identification of data areas, etc., and the 6 1307083 data area can be further divided into 26 frames. [Each frame is composed of a sync pattern and a data block. Composition, in which the data magic is used to store the data written by the user, and the synchronization data is used to protect the data block. Please refer to FIG. 2 for the architecture diagram of the conventional optical disk drive 20, and FIG. 2 is used as an example to illustrate the decoding principle of the DVD-RAM format. The conventional optical disc drive 2 includes a light i s purchase head 202, a disc data debt measurement system 204 and a decoder 2 〇 6. After the optical pickup 202 reads the source data in the DVD-RAM format of the DVD-RAM format, the optical disk data detecting system 204 detects the synchronization data of the 26 frames in the data area based on the source data. Whenever the disc data detecting system 204 detects the sync data of the frame in the data area, a sync pulse of the frame is generated, and the data material position of the frame is purely displayed, so when detecting the data area , 26 sync pulse signals are generated, and these sync pulse signals are output to the decoder. Finally, the decoder applies the "26 sync pulse signal and the source data to decode the data area. The synchronization number of the (four) frame in the _(10) area of the conventional technology is required to be *" Because the header area is far from the data; if there is an error in the paste process, and the data cannot be detected (4), the mixed data of the miscellaneous data will result in the failure to issue the first If = step pulse to indicate the first The decoder decoder 206 of the data block of the frame cannot solve the data area. 1307083 . [Summary of the Invention] CD:=: The present invention provides a method for the ι__ data area, the method of detecting the coffee, and the method of detecting the coffee _中】 When the synchronization data of the frame is sent, the synchronization pulse signal of the first frame that should be outputted by a silly synchronization is sent to the furnace. The position of the data block of the first frame is replaced by the solution. The invention also discloses a disc data detecting system, which is suitable for detecting disc data in a 2-read format, wherein the _-read format disc data = step data and Data area, and the data area includes a plurality of The message ==: the frame further includes - synchronization data and a data block. The optical disk system includes a pre-synchronization signal generator, a false synchronization signal generation ° and a synchronization signal generator. When the pre-synchronization signal When the generator detects the pre-synchronization data, it generates a pre-synchronization pulse signal, and when the pseudo-synchronization signal generator receives the surface-synchronization signal, it generates a pseudo-synchronization pulse signal after the -first specific time length u. After the synchronization signal generator receives the pre-synchronization pulse signal, a synchronization pulse signal of the frame is generated every time the synchronization data of the frame of the plurality of frames is detected. The present invention discloses a signal generation method. According to the disc data in the DVD-RAM format, the optical disc data includes pre-synchronized data and a tribute area, and the data area includes a plurality of frames, each of which includes a half red. &''Include·#"New-#block. This signal generation method includes: Although the pre-synchronized data is detected, the pre-synchronization pulse signal is generated; when the time = 2 is generated, the generation is generated. The length is a first-specific cattle mine u sp—#—synchronization_window of a certain length of time: after the pre-same letter, the length of the 'generating-false synchronization wall, the mother in the debt to the multiple frames The synchronous data of the frame 4' generates a synchronization pulse signal. [Embodiment] FIG. 3 is a diagram of an optical disk drive according to an embodiment of the present invention. The optical disk drive 3G includes an optical pickup 3Q2, Optical disc fine measurement system, first 304 and - solution 34 write. Optical reading head Liu read _ side grid ^ light disc film Qing in the source f material 'then disc information _ system' system 3 04 mother detection source A data area of the poor material generates a plurality of frames of the sync pulse signal, the -synchronous pulse signal and the data area signal, and rotates to the decoder 306. Finally, the decoder writes the data area according to the number of synchronization pulse signals, the false-synchronization v-pulse condition and the poor-dish region signal. The following describes the optical disk data detection system in detail in FIG. 4 and FIG. 304, and the signals it produces. Figure 4 is a block diagram showing the optical disc data system 304 according to an embodiment of the present invention. The optical disc data detecting system 3〇4 includes a pre-synchronization signal generator, a clock counter, a phase-locked loop (10), a coffee, a 1307083 - l〇〇p, a PLL) 406, a synchronous detection window generator, A sync signal generator 410, a frame counter 412, a pseudo sync signal generator 4U, and a data area signal generator 416. The timing diagram of the signals generated by the Disc Data System is shown in Figure 5. The pre-synchronization signal generator 402 is based on the source data system - pre-synchronization data, and the pre-synchronization data has a common bit bit (channel bit), and its pattern (pa1; tern) is just 〇〇 (10) 0100 1000 00100001 0010 〇〇〇〇 1000 〇〇1〇〇〇〇1 When the pre-synchronization signal generator 402 detects one of the following four conditions, it judges that the pre-synchronization data is made, and issues a pre-synchronization pulse signal (ie, FIG. 5). (4)) to notify the fake sync signal generator 414, the sync_window generation, the sync signal generator 41 (), and the data area signal generator 416. The first case is that the #_龙 is an 8-bit channel of 1_1_. The bit center then detects the same 48-bit pass position as the pre-synchronized data, and immediately issues a pre-sync pulse signal. The second case is when an 8-bit channel bit with a pattern of 1000 _ is detected, and then the same bit channel bit of the 4-bit address 兀 (ie _〇0100 0100 = _ plane) is detected. When the time is counted, after the time count of the clock counts 404 counts 24 clocks, the pre-synchronization is issued in the case where the 8-bit channel bit whose pattern is simple is detected, and then the pattern of the residual and _ step series is detected. The last 24 Wei Weiyuan (ie 20 1307083 « : 〇 looootnoo, Q_ the same 24-bit channel bit immediately issued a pre-synchronization pulse signal. The fourth case is when the detection pattern is 1_ 1GG0 8-bit channel bit, Connect (4) with the pre-synchronized data, the first 6-bit channel bit (that is, the same 6-bit channel bit as the face (1)), then pre-synchronize after the time of the day-to-day sneak 404 count 42 clocks , the rushing signal, wherein each of the above clocks is generated by the phase-locked loop gamma., a > rice synonym (No. 414 receives the pre-synchronization pulse signal, delay - the length of the first riding interval (Τ1), false synchronization The signal generator appears to generate: a sync pulse signal (ie, (7) in FIG. 5), and the notification frame counter 12 starts from 1 When the sync detection window generator receives the pre-sync pulse signal, the length is the length of the first-form time (five) plus - the second specific time:: the synchronous pick-up window (ie, (6) of Figure 5 The length of the first-specific knowledge may be the time when the clock counter 2 is second specific _ and "the time of the τ τ pulse, and the time gate pulse counter 212 counts no more than 90 clocks ^ and 3^ The clock and 90 clock systems are generated by the phase-locked loop 406. According to the IS: ίί, the device 410 receives the pre-synchronization pulse signal, and then the root is in each: Fu', : ' each in the bedding area The synchronization data of the frames immediately synchronizes the data of each frame in the two areas, and the synchronization signal is generated: and the frame counter 412 is notified. 410 only the length of the synchronization detection window (TUT2) !3 〇7083 •• The synchronization data of the first frame in the data area. If the synchronization data of the first frame is detected, the synchronization signal generator 410 immediately sends a synchronization pulse signal, and the notification frame The counter seems to start counting! Taking Figure 5 as an example, the synchronous data of the first frame is the fastest side to the bit. After the first certain length of time of the sync detection window, its position is in the position of $ (4)' and if it is within the second special length of the sync_window (4), for example, the position (e) is detected. When it arrives, it immediately sends a step pulse signal at position (4). Synchronize the ^ number to generate the benefit 41 〇 Continue to detect the synchronization data of the 2nd to 26th frames in the data area. Synchronization immediately sends a sync pulse signal, and the notification frame thief 412 count increases by 1. When the count is 26, the frame counts cry 412 to notify the data area signal generator 416. The area signal generator 416 is configured to generate a data area signal 2. When the data area signal generator 416 receives the pre-synchronization pulse, the signal area signal generator 416 boosts the data area signal from low logic to high logic level. (8), and when the frame counter 412 261' informs the data area signal generator that the delay - specific Y reduces the bedding area signal from the high logic level back to the low logic level. In the area of Yinxian, the location of the data is the location of the data, that is, the material of the source at this time, and the signal in the data area is the low logic level of 12 1307083 = set, which means that it is received at this time. Source material is not information in the data area. ^ Decoder write can use the high and low logic levels of the data area signal to find the location of the data area. ^Invented after the issuance of the pulse test, after delaying the first-specific time, the false sync pulse signal is sent, even if there is no paste to the data in the data field, the false sync pulse can be used. The sync pulse signal of the first frame to be sent is replaced, and the position of the pseudo sync signal is decoded to decode the data area. If the synchronization data of the first frame is detected after the false sync pulse signal is sent, and the first sync signal of the frame is sent, the solution u(10) ignores the false sync pulse signal, and The data area is decoded according to the position of the sync pulse signal of the first frame. 6a, 6b, and 6c are flowcharts of optical disc data detection according to an embodiment of the present invention. The disc data_method includes steps S6G1 to S617. ^Refer to the 6th, 6b picture 'disc data_method first in step S601 = a pre-synchronization data, then in the step coffee, determine whether to first detect the 1 style of the 1 bit channel bit, and then detect The pattern of the fish 2 step data is all _4 δ bit channel bits. The shirt first detects [8-bit channel bit of the formula 1000, and then detects and synchronizes the digital pattern phase _ 48-bit channel bit. In step S606, a pre-sync pulse signal is issued. 13 1307083 If the 8-bit channel bit with the style of 1000 1 000 is not detected first, and then the 48-bit channel bit with the same pattern as the pre-synchronized data is detected, then in step S603, it is determined whether to detect first. Go to 8-bit channel bits of style 1000 1000, and then detect the same 24-bit channel bits as the first 24 bit channels in the pre-synchronized data pattern. If the 8-bit channel bit of the style 1000 1000 is detected first, and the 24-bit channel bit of the same 24-bit channel bit in the pattern of the pre-sync data is detected later, it is accumulated in step S607. At 24 hours, a pre-sync pulse signal is sent in step S606. If the 8-bit channel bit of the style 1000 1000 is not detected first, and then the 24-bit channel bit of the same 24-bit channel bit in the pattern of the pre-sync data is detected, then in step S604, It is judged whether the 8-bit channel bit of the pattern of 10 0 0 10 0 0 is detected first, and then the 24-bit channel bit of the same 24-bit channel bit in the pattern of the pre-synchronized data is detected. If the 8-bit channel bit of the style 1000 1000 is detected first, and the 24-bit channel bit of the last 24-bit channel bit in the pattern of the pre-sync data is detected later, immediately in step S606 A pre-sync pulse signal is issued. If the 8-bit channel bit of the style 1000 1000 is not detected first, and then the 24-bit channel bit of the last 24-bit channel bit in the pattern of the pre-sync data is detected, then in step S605, Determine if 14 1307083 is detected first: an 8-bit channel bit with a pattern of 1_1000 is detected, and a 6-bit channel bit that is the same as the first 6-bit channel bit in the pre-synchronized data pattern is detected. If the 8-bit channel bit with the style of 1000 is detected first, and the 6-bit channel with the same 6-bit channel element in the pre-synchronized data pattern is detected, then in Step S6 (10) , 42 pulses are accumulated, and a pre-sync pulse signal is sent in step S606. If you don't make a style first! The 8-bit channel bit of _, and the 6-bit channel bit which is the same as the first 6-bit channel bit in the pre-synchronized data pattern, end the disc data detecting method. After the pre-sync pulse signal is issued in step S6〇1, the data area is set to the high logic level in the step side, and then to step S610. Please refer to Figure 6c to detect the synchronization data of the first frame in the data area in the step 〇. Next, in step S6u, a time-length (e.g., 32 clocks) input-synchronization pulse signal is delayed, and in the second step, it is judged whether or not the second frame time data is detected in the second specific time length (4). If there is synchronous data of the first frame of the frame, a synchronization pulse signal is immediately sent in the step Sin q & π r 613; the synchronization data of the first frame is detected, and then the steps are started. count. Field - Then in the step mail, detect the data from the second to the frame in the data area. In step 6, for example, each time a sync 15 1307083 data is generated, a sync pulse signal is issued and the count is incremented by one. Next, when the count is 26 in step S617, the data area signal is set to a low logic level, and finally the optical disc data detecting method is ended. Although the embodiments of the present invention are disclosed above, it is not intended to limit the present invention, and any one skilled in the art can make some modifications and retouchings without departing from the spirit and scope of the present invention. This is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS In order to make the above objects, features and advantages of the present invention more comprehensible, the following detailed description of the embodiments and the accompanying drawings Rail format. Figure 2 is a block diagram of a conventional optical disk drive 20. Figure 3 is a block diagram of an optical disk drive 30 in accordance with an embodiment of the present invention. Figure 4 is a block diagram of a disc data detecting system 304 in accordance with an embodiment of the present invention. Figure 5 is a timing diagram of signals generated by the optical disc data detection system 304 in accordance with the present invention. 6a, 6b, and 6c are flowcharts of a method for detecting a disc data according to an embodiment of the present invention. [Major component symbol description] 200-DVD-RAM format optical disc; 202-optical read head; 204- 16 1307083. Optical disc data detection system; 206-decoder. 300-DVD-RAM format optical disc; 302-optical read head; 304-disc data detection system; 306-decoder. 402-pre-synchronization signal generator; 404-clock counter; 406-phase-locked loop; 408-synchronous detection window generator; 410-synchronization signal generator; 412-frame counter; 414-false sync signal generator; 416 - Data area signal generator. S601 ~ S617 - steps.
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