20053量。c/c 九、發明說明： 【發明所屬之技術領域】 本發明是關於一種判斯翁朽夕 崎数位夕功能光碟種類的方法 與裝置，且特別是關於-種判斷分辨dvD-r〇m、 DVD—、以及DVD+光碟片的方法與裝置。 【先前技術】 •時下已經非常普及的數位多功能光碟（出㈣ disc’簡稱為DVD) ’除了只能用來讀取資料的dvd_r〇m (後面的“ROM”代表唯讀式記憶體，也就是代“ me励ry)以外，也有可供燒錄資料的種類。而可供燒錄 資料的DVD，因為規格不同，又分為DVD一與DVD+兩 種。目别大部分的DVD光碟機都相容於多種不同規格， 因此判斷使用者放入的光碟片種類，就成為一項重要技 術0 目前的方法是使用預設槽擺動訊號（pre_gr〇〇ve wobble signal，以下簡稱擺動訊號）内含的位置資訊來判 斷DVD種類。根據DVD的規格，dvd_r〇m沒有擺動 訊號，而DVD—與DVD+除了 一般執道之外，還會有擺 動訊號，其來源請參照圖1。當光碟片在DVD光碟機裡 面旋轉時，讀寫頭101會沿著於執道102向外滑出，如圖 所示’此日t項寫頭101的感光—極體(photo diode 1C)排列 如圖1所示，則A、B、C、D四個區域，會各自感應到 不同強度的訊號，而擺動訊號係根據如下之公式獲得： G X [ gj X (A + D) - g2 x (B + C)] 20053m〇c/c 其中G、gi與&皆為可調整之增益值(gain)。 DVD—與DVD+各有一套定位方式是混在擺動訊號 之内，可經由邏輯運算電路經解譯後取得目前位置資訊。 圖2繪示DVD+的擺動訊號，在擺動訊號2〇1之中含有 多個相變區202，此擺動訊號經邏輯運算電路解譯後便可 以取得位置資訊。至於DVD—的擺動訊號請參照圖3， 在擺動訊號301之中含有多個凸紋預設孔(land pre_pit) 302，同理，位置資訊可經由邏輯電路解譯後取得。由圖 2與圖3可知，DVD+與DVD—的擺動訊號不同，邏輯 運异電路的解譯功能也不同，因此可用來判斷DVD種類。 圖4為目前使用的數位多功能光碟種類判斷方法的 程圖。首先步驟402會先猜測使用者放入的光碟片為 DVD+ ’因此設定DVD+使用的相關參數，然後步驟404 會I試讀取目前位置資訊，如果讀取成功，步驟4〇6會判 斷光碟片的種類為DVD+。否則，接下來的步驟4〇8會猜 ’則光碟片為DVD—，並設定DVD—使用的相關參數，然 後步驟410會再度嘗試讀取目前位置資訊，如果成功，步 驟412會判斷光碟片的種類為DVD—,否則步驟414會 判斷光碟片的種類為DVD-ROM。 曰 這種方法的缺點是DVD+與DVD —使用的相關參 ^，必須能涵蓋大多數的光碟片，特別是燒錄過資料的光 碟片’上面的位置資訊品質會變差，經常容易誤判。因此， ，們需要一種方法來解決這個問題，以提高正確判斷數位 夕功能光碟種類的機率。 2005miL·, 【發明内容】 本發明提供一種數位多功 克服先前技術的缺點，解決容易誤判的=判斷方法，以 本發明也提供一種數位多、 以克服切技術的缺點，提“確斷裝置， 類的機率。 j所數位多功能光碟種 為達成上述及其他内容，本發 出-種數位多功能光碟種類^佳實施例提 設;相關參數，自-數位多功能光碟操取!=驟包括： 设定除頻因子，以除頻因子將 他動況7虎，並 以光碟機之錄馬料㈣/ /4的擺動峨_。然後， 日守間為早位時間’計算除頻後之 ^圈所而之 據除頻後之擺動簡之頻^ ，最後’根 種類。 低判断數位多功能光碟之 另提及力其Λ内容，本發明之又一較佳實施例 狀署，夕功月b光碟種類判斷裝置，包括：一操取 : (位乡魏柄#1取—擺動訊號，將擺動訊號 ^位化，並輸出數位化之擺動訊號，·以及-判斷裝置。，耦^ 裂置’根據擺動訊號之頻率，判斷並輸出 數^夕料先碟之種類。其中，上述之判斷裝置更包括： -渡波裔’墟於上述之判斷裝置之輸入端，接收數位化 之擺動訊號’濾除擺動訊號之雜訊，並輸出濾、除雜訊後之 擺=訊號^計頻器，麵接於上述之滤波器，根據滤除雜 Λ後之擺動喊’計算並輸出擺動訊號之頻率；以及一判 20053§8y^d^ 1了、’，她於上述之計，根據擺動訊號之頻率高低， 、斷並輸出數位多功能光碟之種類。 &…本啦明係根據擺動訊號之頻率高低，判斷數位多功 月b光石樂之種類’而非如同先前技術根據内含於擺動訊動之 位置二汛，因此可避免先前技術容易誤判與不易提供適用 所有光碟機之資訊的缺點，提高正確判斷數位多功能光碟 種類的機率。 為瓖本發明之上述和其他内容、特徵和優點能更明 顯易懂，下文特舉較佳實施例，並配合所附圖式，作詳細 說明如下。 【實施方式】 本發明疋利用數位多功能光碟（digital versatile disc， 簡稱為DVD)之擺動訊號(wobble signai)頻率，來區分 DVD-ROM (後面的“r0M”代表唯讀式記憶體，也就是 read only memory)、DVD—、與 DVD+ 這三種數位多功 能光碟。下面特舉實施例，以說明本發明提出的數位多功 能光碟種類判斷方法與裝置。 不同種類的DVD有不同的擺動訊號頻率，在資料傳 輸倍率(data transfer rate)為一倍速（1349 KB/s)的情況下， 以光碟機主軸馬達(spindle motor)帶動光碟片旋轉一圈的 時間為單位時間，則DVD+的擺動訊號頻率為 817·5ΚΗζ，DVD —的擺動訊號頻率為140·6ΚΗζ，而 DVD-ROM並無任何擺動頻率記載於碟片上，因此頻率為 零。這個頻率上的差別，正是本發明的判斷依據。20053 volume. c / c IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to a method and a device for judging the type of a digital disc with a functional disc, and in particular, it relates to a kind of judging and discriminating dvD-r0m, Method and device for DVD-, and DVD + disc. [Previous technology] • A digital multi-function disc (disc called "DVD" for short) that has become very popular nowadays, except for dvd_r〇m, which can only be used to read data ("ROM" in the following stands for read-only memory, In other words, there are also types of data that can be burned in addition to "Meiliry". DVDs that can be burned are divided into two types: DVD1 and DVD + because of different specifications. Most DVD players All are compatible with a variety of different specifications, so judging the type of disc that the user puts in has become an important technology. 0 The current method is to use a pre-groove wobble signal (hereinafter referred to as a wobble signal). The location information is included to determine the type of DVD. According to the specifications of DVD, dvd_rom has no wobble signal, and DVD- and DVD + have wobble signals in addition to the general channel, please refer to Figure 1. When the disc is in When the DVD drive rotates inside, the read / write head 101 will slide out along the guideway 102, as shown in the figure. 'The photodiode 1C of the t-term write head 101 is arranged as shown in Figure 1. Display, then A, B, C, D four areas, Signals of different intensities are sensed separately, and the wobble signal is obtained according to the following formula: GX [gj X (A + D)-g2 x (B + C)] 20053m〇c / c where G, gi and & are all It is an adjustable gain value. DVD- and DVD + each have a set of positioning methods that are mixed in the wobble signal, and the current position information can be obtained after interpretation by the logical operation circuit. Figure 2 shows the DVD + wobble signal. The wobble signal 201 includes a plurality of phase change regions 202. This wobble signal can be obtained by interpreting the logic operation circuit. As for the DVD-wobble signal, please refer to FIG. 3, and the wobble signal 301 contains multiple A land pre_pit 302. Similarly, the position information can be obtained by interpreting the logic circuit. As can be seen from Figures 2 and 3, the wobble signals of DVD + and DVD- are different, and the logic operation circuit is interpreted differently. The functions are also different, so it can be used to determine the type of DVD. Figure 4 is a flowchart of the current method for determining the type of digital multi-function discs. First, step 402 will first guess the disc that the user puts in is DVD + ', so set the relevant DVD + use Parameters, then step Step 404 will try to read the current location information. If the reading is successful, step 406 will determine the type of the disc as DVD +. Otherwise, the next step 408 will guess 'the disc is DVD-' and set DVD—the relevant parameters used, and then step 410 will try to read the current location information again. If successful, step 412 will determine the type of the optical disc as DVD— otherwise, step 414 will determine the type of the optical disc as DVD-ROM. The disadvantage of this method is that the relevant parameters used by DVD + and DVD ^ must be able to cover most optical discs, especially the discs that have recorded data. The quality of the position information on the disc will deteriorate, and it is often easy to misjudge. Therefore, we need a method to solve this problem in order to increase the probability of correctly judging the type of digital function disc. 2005miL ·, [Summary of the Invention] The present invention provides a digital multi-function to overcome the shortcomings of the prior art, to solve the = judging method that is easy to be misjudged. The present invention also provides a digital multi-function to overcome the shortcomings of the cutting technology. Probability of category. In order to achieve the above and other contents of the digital multi-function disc type, this issue is a kind of digital multi-function disc type ^ The preferred embodiment is provided; related parameters, self-digital multi-function disc operation! = Steps include: Set the frequency division factor to divide the dynamic situation of the 7 tigers by the frequency division factor, and use the recorder of the optical disc player to swing the 峨 / 4. Then, the daytime interval is the early time 'to calculate the frequency after division ^ According to the circle, the frequency of the swing is divided by the frequency ^, and finally the root type. The low-judgment digital multi-function disc also mentions its Λ content. Another preferred embodiment of the present invention is signed. b Disc type judging device, including: One operation: (Wei Xiangwei handle # 1 take-swing signal, digitize the swing signal ^, and output digital swing signal, and-judgment device., coupling ^ split 'Based on the frequency of the wobble signal, The types of the first discs are listed. Among them, the above-mentioned judging device further includes:-A wave crossing at the input terminal of the above-mentioned judging device, receiving a digitalized swing signal to filter out the noise of the swing signal and output Pendulum after filtering and noise removal = signal ^ frequency counter, connected to the above-mentioned filter, calculates and outputs the frequency of the wobble signal according to the wobble after filtering the noise Λ; and a judgment 20053§8y ^ d ^ "1,", in the above, she cut off and outputs the type of digital multi-function disc according to the frequency of the wobble signal. &Amp; ... Ben Laming judges the digital multi-function moonlight b light stone based on the frequency of the wobble signal. "The kind of music" is not the same as the previous technology based on the position contained in the wobble, so it can avoid the shortcomings of the previous technology, which is easy to misjudge and not easy to provide information applicable to all optical disc drives, and improve the probability of correctly judging the type of digital multifunctional disc In order to make the above and other contents, features, and advantages of the present invention more comprehensible, the following describes the preferred embodiments in detail with the accompanying drawings, as follows. The present invention uses the wobble signai frequency of a digital versatile disc (DVD for short) to distinguish a DVD-ROM ("r0M" on the back stands for read-only memory, that is, read only memory ), DVD—, and DVD + are three types of digital multi-function discs. The following examples are given to illustrate the method and device for determining the type of digital multi-function discs proposed by the present invention. Different types of DVDs have different wobble signal frequencies during data transmission. When the data transfer rate is a double speed (1349 KB / s), the time that the optical disc drive spins the disc to make one rotation is the unit time, and the DVD + wobble signal frequency is 817 · 5ΚΗζ , DVD — The wobble signal frequency is 140 · 6ΚΗζ, but DVD-ROM does not record any wobble frequency on the disc, so the frequency is zero. This difference in frequency is the basis of the judgment of the present invention.
20053HC 在光碟機等裝置中，實際上的頻率計算較為複雜， 由於光碟機大多採用固定角速率（constant angular velocity，簡稱為CAV)模式，因此光碟片最内圈與最外 圈的資料傳輸倍率顯然不同，也就是說’ DVD —與DVD+ 的擺動訊號頻率會是一個範圍，而非單一數字。此外在分 析擺動訊號的邏輯電路之中，可能會有一個「除頻」動作， 就是以一個固定的除頻因子，降低擺動訊號的頻率，例如 除頻因子若為1/2,則除頻後的擺動訊號頻率就是原來的 1/2。顯然地，在DVD+最内圈讀取到的擺動訊號頻率應 為· 817·5ΚΗζχ最内圈資料傳輸倍率X除頻因子 在DVD+最外圈讀取到的擺動訊號頻率應為： 817·5ΚΗζχ最夕卜圈資料傳輸倍率X除頻因子 同理，在DVD—最内圈讀取到的擺動訊號頻率應為： 140.6ΚΗζχ最内圈資料傳輸倍率X除頻因子 在DVD—最外圈讀取到的擺動訊號頻率應為： 140.6ΚΗζχ最夕卜圈資料傳輸倍率X除頻因子 在本實施例中，光碟機是以四倍速的CAV模式旋轉， 因此最内圈的資料傳輸倍率大約為2倍，最外圈的資料傳 輸倍率大約為4倍，而除頻因子為1/2。經過簡單的計算 之後可以得知，DVD+的擺動訊號頻率範圍為800ΚΗζ〜 1.6MHz，DVD —的擺動訊號頻率範圍為HOKHz〜 280KHz，而DVD-ROM為〇，如圖5所示。實際上， DVD-ROM可能因為真實環境的誤差而出現微小的擺動訊 2005亀。c/c 號頻率，這不會影響本發明的判斷。 由圖5可知’在固定轉速的前提下，這三種光 的頻率範圍並無重疊，而且相隔甚遠，因此無須擔心在石片 片上的不同位置讀取到不同的擺動頻率而造成誤判。’、 本實施例包含了除頻動作，所有的相關數字與細… 都已經將除頻列入考慮，而實際上這個動作可以省略20053HC In optical disc drives and other devices, the actual frequency calculation is more complicated. Because optical disc drives mostly use constant angular velocity (CAV) mode, the data transmission ratio of the innermost and outermost circles of the optical disc is obviously The difference is that the wobble signal frequency of 'DVD — and DVD + will be a range, not a single number. In addition, in the logic circuit that analyzes the wobble signal, there may be a "frequency division" action, which is to reduce the frequency of the wobble signal by a fixed frequency division factor. For example, if the frequency division factor is 1/2, The frequency of the wobble signal is 1/2 of the original. Obviously, the frequency of the wobble signal read on the innermost circle of DVD + should be · 817 · 5ΚΗζχ The data transmission magnification of the innermost circle X division factor The frequency of the wobble signal read on the outermost circle of DVD + should be: 817 · 5ΚΗζχ most In the same way, the frequency of the data transmission magnification X division factor in the DVD circle is the same. The frequency of the wobble signal read in the innermost circle of the DVD should be: 140.6ΚΗζχ The data transmission magnification factor X of the innermost circle is read in the outermost circle of the DVD. The frequency of the wobble signal should be: 140.6ΚΗζχ the maximum data transmission rate X division factor. In this embodiment, the optical disc drive rotates in the CAV mode at four times the speed, so the data transmission rate of the innermost circle is about 2 times. The outermost data transmission ratio is about 4 times, and the division factor is 1/2. After a simple calculation, it can be known that the wobble signal frequency range of DVD + is 800KΗζ ~ 1.6MHz, the wobble signal frequency range of DVD- is HOKHz ~ 280KHz, and DVD-ROM is 0, as shown in Figure 5. In fact, DVD-ROM may show slight wobble due to the error of the real environment. c / c frequency, this will not affect the judgment of the present invention. It can be seen from Fig. 5 that under the premise of fixed rotation speed, the frequency ranges of the three types of light do not overlap and are far apart, so there is no need to worry about reading different wobble frequencies at different positions on the stone and causing misjudgment. ’This embodiment includes a frequency division operation, all relevant numbers and details have been taken into consideration, but in fact this operation can be omitted
果不除頻，圖5的擺動訊號頻率範圍必須去掉除頻因 D 影響，在下面的裝置架構圖（圖6)中，必須去掉、陕的 相關元件，在下面的方法流程圖（圖7)中，也必的 除頻的相關步驟。對熟習此技術領域的人而言，這此= 應該不難做到。 σ二调土 圖6為本實施例的裝置架構圖。如圖所示， 置601會從數位多功能光碟擷取擺動訊號6〇7，抨= 號607數位化之後，輸出至判斷裝置6〇2。判斷穿=⑹ 會根據擺動訊號6()7的解，判斷數位多功、 類’並輸出光碟的種類訊號。 ”、 判斷裝置繼當中包含了幾個元件，首先， 607^ ^ 矾不大或不會造成判斷困難時， 田α在雜 除頻器604會以預設的除頻因子略^慮波器㈤）。 緊接著，計頻器605备接 〜、，口。十頻态605。 中並未繪示）所發送的轉^ I機的料馬達（圖 心虎609 ’並根據轉速訊號 20053鳳 oc/c 609 ’以主軸馬達帶動數位多功能光碟旋轉一圈所需日卞 間為單位時間，計算除頻後的擺動訊號頻率，將這:頻= 輸出至判斷器606。至於啟動訊號608的作用，^通矣、率 頻器605何時開始計算頻率。最後，判斷器6〇6二二° = 頻605輸出的頻率高低，以及圖5繪示的各種光 σ 率範圍，判斷數位多功能光碟的種類，並輸 種^ 號610。 犬員矾 圖7為本實施例的方法流程圖。首先， 數，步驟7()4會從數位多功能光碟二= 用除頻因子將擺動=可 光碟於Μ二Υ 會以光碟機的主軸馬達帶動數位多功处 ，、疋轉一圈所需的時間為單 月匕 訊號頻率。 彳守Π #除頻後的擺動 號頻712會根據除頻後的擺動訊 判斷數位多==;類。如果頻率為零，步㈣會 140邮與280nf7 DVD-R0M。如果頻率位於 碟的種類為D 乂驟7丨6會判斷數位多功能光 之間，步驟718合判斷率位於8〇〇KHz與1.6職 在此，料J畊數位多功能光碟的種類為DVD+。 除頻因子是Ί功能光碟片是勵+或誦―，常用之 未能頻利判斷出/^即在使用某種除頻因子後，若 除頻因子來計管。 九碟片之内容，便可以使用另一種 2〇〇53mw5f,oc/c 由以上說明可知，本發明係根據擺動訊號之頻 低，判斷數位彡魏光叙麵，_如同切技術根】 内含於擺動訊動之位置資訊，因此可避免先前技術容易】 判的缺點，提高正確判斷數位多功能光碟 、 實施例揭露如上非 以限定本發明’任何熟習此技藝者，在不脫離本發明之二 神和範圍内，當可作些許之更動與潤_，因此本發明之^ 濩乾圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 圖1為擺動訊號的來源示意圖。 圖2為DVD+的擺動訊號示意圖。 圖3為DVD—的擺動訊號示意圖。 圖4為先前的數位多功能光碟種類判斷方法流程圖。 圖—5為本發賴出的餘^力能光碟觀判斷裝置 网”仏例巾，二觀位彡魏光麵軸訊號頻率範 圖6 的某一實㈣魏㈣觀判斷裝置 種類判斷方法 圖7為本發明提出的數位多功能光碟 的某一實施例的流程圖。 ” 【主要元件符號說明】 A B、C、D ·光碟機讀寫頭的四個區域 101 : DVD光碟機的讀寫頭 102 : DVD光碟片上的執道 200539115 13830twf.doc/c 201 ： D VD+的擺動訊號 202 ： DVD+的擺動訊號内含的相變區 301 ： DVD—的擺動訊號 302 ： D V D —的擺動訊號内含的凸紋預設孔 402 ： 設定DVD+使用的相關參數 404 ： 是否讀取到目前位置？ 406 ： DVD+ 408 ： 設定DVD—使用的相關參數 410 ： 是否讀取到目前位置？ 412 ： DVD- 414 ： DVD-ROM 601 ： 擷取裝置 602 ： 判斷裝置 603 ： 溏波器 604 ： 除頻器 605 ： 計頻器 606 ： 判斷器 607 ： 擺動訊號 608 ： 啟動訊號 609 ： 轉速訊號 610 ： 光碟種類訊號 702 ： 設定相關參數 704 ： 擷取擺動訊號 706 ： 設定除頻因子為1/2 200539115 13830twf.doc/c 708 :除頻 710 :計算除頻後之擺動訊號頻率 712 :根據除頻後之頻率，判斷光碟種類 714 ： DVD-ROM 716 : DVD — 718 ： DVD+If the frequency is not removed, the frequency range of the wobble signal in Figure 5 must be removed due to the influence of frequency D. In the following device architecture diagram (Figure 6), the relevant components of Shaanxi must be removed. The following method flowchart (Figure 7) In addition, the relevant steps of frequency division must also be performed. For those familiar with this technical field, this = should not be difficult to do. σ two-toning soil FIG. 6 is a device architecture diagram of this embodiment. As shown in the figure, the device 601 captures the wobble signal 607 from the digital multi-function disc, and after the signal = 607 is digitized, it is output to the judgment device 602. Judging wear = ⑹ will judge the digital multi-function, class ′ and output the type signal of the disc according to the solution of the wobble signal 6 () 7. The judging device includes several components. First, when 607 ^^ is not large or does not cause difficulty in judging, the field α in the hybrid frequency divider 604 will consider the wave filter with a preset frequency division factor. ). Then, the frequency counter 605 is ready to be connected to the port, the ten-frequency state 605. (not shown in the figure). / c 609 'Using the spindle motor to drive the digital multi-function disc to make one full revolution of the unit of time, calculate the frequency of the swing signal after frequency division, and output this: frequency = output to the judge 606. As for the role of the start signal 608 When the frequency-frequency generator 605 starts to calculate the frequency. Finally, the determiner 6026 ° = the frequency of the output of the frequency 605, and the various optical σ rate ranges shown in Figure 5, determine the digital multi-function disc. Type, and type ^ No. 610. Figure 7 shows the method flow chart of this embodiment. First, count, step 7 () 4 will start from the digital multi-function disc. Μ 二 Υ will use the spindle motor of the optical disc drive to drive the digital multi-function, The required time is the single-month signal frequency. 彳 守 Π #The frequency of the wobble signal frequency 712 after the frequency division will determine the number of digits according to the frequency of the frequency-divided wobble signal ==; class. If the frequency is zero, the step will be 140 mail and 280nf7 DVD-R0M. If the type of the disc is D, step 7 丨 6 will judge the digital multi-function light. The combined judgment rate of step 718 is between 800KHz and 1.6. Here, the digital multi-function disc is expected. The type is DVD +. The frequency division factor is Ί function. The disc is excited + or chanting. It is often used to fail to determine the frequency / ^, that is, after using a certain frequency division factor, if the frequency division factor is counted. As for the content of the film, another 20053mw5f, oc / c can be used. As can be seen from the above description, the present invention judges the digital surface of Wei Guangxu based on the low frequency of the wobble signal. Location information, so it can avoid the shortcomings of the prior technology. Improve the correct judgment of digital multi-function discs. The embodiment exposes the above as not to limit the invention. Anyone skilled in this art will not deviate from the two spirits and scope of the invention. When something can be changed and _, Therefore, ^ Qianganwei of the present invention shall be determined by the scope of the attached patent application. [Simplified description of the drawings] Figure 1 is a schematic diagram of the source of the wobble signal. Figure 2 is a schematic diagram of the DVD + wobble signal. Figure 3 It is a schematic diagram of the wobble signal of DVD-. Figure 4 is a flowchart of the previous method for determining the type of digital multi-function discs. The frequency range of the Weiguang axis signal is shown in Figure 6. Figure 7 shows a method of determining the type of the device. Figure 7 is a flowchart of an embodiment of the digital multi-function disc proposed by the present invention. "[Description of main component symbols] AB , C, D · Four areas of the optical disk drive's read and write heads 101: DVD drive's read and write heads 102: DVD drive discs 200539115 13830twf.doc / c 201: D VD + wobble signal 202: DVD + wobble signal Built-in phase change area 301: DVD—wobble signal 302: DVD—wobble signal Convex preset hole 402: Set related parameters 404 used by DVD +: Did you read the current position? 406: DVD + 408: Set DVD-related parameters used 410: Did you read the current position? 412: DVD-414: DVD-ROM 601: Retrieval device 602: Judging device 603: Wavelengthr 604: Frequency divider 605: Frequency counter 606: Judging device 607: Swing signal 608: Start signal 609: Speed signal 610 : Disc type signal 702: Set related parameters 704: Capture wobble signal 706: Set the division factor to 1/2 200539115 13830twf.doc / c 708: Divide 710: Calculate the wobble signal frequency after division 712: According to the division Discrete frequency, determine the type of disc 714: DVD-ROM 716: DVD — 718: DVD +