WO2005117008A1

WO2005117008A1 - Method and apparatus for type determination of digital versatile discs

Info

Publication number: WO2005117008A1
Application number: PCT/CN2004/001409
Authority: WO
Inventors: Ricky Chang; Allen Lu
Original assignee: Via Technologies, Inc.
Priority date: 2004-05-25
Filing date: 2004-12-03
Publication date: 2005-12-08
Also published as: WO2005117008A8; BRPI0418819A

Abstract

A method and its corresponding apparatus for type determination of digital versatile discs (DVD), whose advantage is higher probability of correct type determination. The main steps of the method include: initializing the related parameters, getting a wobble signal from a DVD, choosing a number for dividing the frequency of the wobble signal, and then counting the divided wobble frequency, taking the time interval for the spindle motor to bring the DVD to rotate a full circle as the time unit, and finally determine the type of the DVD based on the divided wobble frequency.

Description

Method and device for judging digital multi-function disc type

The invention relates to a method and a device for judging the type of a digital multi-function optical disc, in particular to a method and a device for judging and distinguishing a type of a digital multi-function optical disc of DVD-ROM, DVD-, and DVD + disc. Background technique

Digital versatile discs (dig i talversat i ledi sc, DVD) are very popular nowadays, except for DVD-ROMs which can only read data ("ROM" in the following stands for read-only memory, that is, readonlymemory), there are also types of data that can be burned. The DVDs that can be used for recording materials are divided into DVD- and DVD + because of different specifications. At present, most DVD players are compatible with a variety of different specifications, so judging the type of optical discs that users put in has become an important technology.

The current method is to use the position information contained in a pre-groovewobbles ignal (hereinafter referred to as a wobble signal) to determine the type of DVD. According to the DVD specifications, DVD-ROM does not have a wobble signal, and DVD- and DVD + will have wobble signals in addition to the normal track. Please refer to Figure 1 for the source. When the optical disc rotates inside the DVD drive, the read-write head 101 will slide out along the track 102, as shown in the figure. At this time, the photodiodeIC of the read-write head 101 is arranged as shown in Figure 1. Display, the four areas of people, B, C, and D will each sense signals of different strengths, and the swing signal is obtained according to the following formula:

GX [ _gl X (A + D)-g ₂ (B + C)]

Among them, G, _§1 and _g2 are all adjustable gain values (ga in).

DVD- and DVD + each have a set of positioning methods that are mixed in the wobble signal. The current position information can be obtained after interpretation by logical operation circuits. Figure 2 shows the wobble signal of DVD +. The wobble signal 201 contains multiple phase change regions 202. After the wobble signal is interpreted by the logic operation circuit, position information can be obtained. As for the wobble signal of DVD-, please refer to FIG. 3. The wobble signal 301 contains a plurality of land-preset holes 302. Similarly, the position information can be obtained by interpreting the logic circuit. It can be seen from FIG. 2 and FIG. 3 that the wobble signals of DVD + and DVD- are different, and the interpretation function of the logic operation circuit is also different, so it can be used to judge the type of DVD.

Please refer to FIG. 4, which is a flowchart of a method for judging the type of a digital multi-function disc currently used. First, step 402 will first guess the disc inserted by the user as DVD +, so set the relevant parameters used by DVD +, and then step 404 will try to read the current location information. If the reading is successful, step 406 will determine the type of the disc. DVD +. Otherwise, the next step 408 will guess the disc is DVD-, and set the relevant parameters for DVD-, and then step 410 will try to read again If the current location information is successful, step 412 determines that the type of the optical disc is DVD-; otherwise, step 414 determines that the type of the optical disc is DVD-ROM.

The disadvantage of this method is that the relevant parameters of DVD + and DVD- used must be able to cover most optical discs, especially the discs with recorded data. The quality of the position information on the discs 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 versatile disc.

It can be seen that, the above-mentioned existing method and device for determining the type of a digital multifunctional optical disc still have inconveniences and defects, and further improvement is urgently needed. In order to solve the problems of the method and device for judging the type of digital multi-function discs, the relevant manufacturers have made every effort to find a solution, but for a long time no applicable design has been developed, and the general product has no suitable structure. Solving the above-mentioned problems is obviously a problem that relevant industry operators are anxious to solve.

In view of the shortcomings of the existing methods and devices for judging the types of digital multi-function discs, the inventor is actively researching and innovating based on the rich practical experience and professional knowledge of designing and manufacturing such products for many years. A novel structured method and device for determining the type of a digital multifunctional optical disc can improve the existing methods and devices for determining the type of a digital multifunctional optical disc, and make it more practical. After continuous research and design, and after repeated trial production of samples and improvements, the present invention was finally created with practical value. Summary of the invention

The purpose of the present invention is to overcome the shortcomings of the existing digital multi-function disc type determination method and provide a new digital multi-function disc type determination method. The technical problem to be solved is to make it easy to misjudge. It is more suitable for practical use, and has industrial use value.

Another object of the present invention is to provide a digital multi-function disc type judging device. The technical problem to be solved is to overcome the disadvantages of the prior art, improve the probability of correctly judging the type of digital multi-function discs, and thus be more suitable for practical use.

The object of the present invention and the solution of its technical problems are achieved by using the following technical solutions. A method for determining the type of a digital multi-function optical disc according to the present invention includes the following steps: (a) retrieving a wobble signal from a digital multi-function disc; and (b) judging the number of digital bits based on the frequency of the wobble signal. Type of function disc.

The objective of the present invention and its technical problems can be further achieved by using the following technical measures. In the foregoing method for determining the type of a digital multifunctional disc, the step (b) further includes: if the frequency of the wobble signal is less than a first frequency, determining that the type of the digital multifunctional disc is a first type; if the The frequency of the wobble signal is between a second frequency multiplied by the data transmission magnification of the innermost circle of the digital multi-function disc and the second frequency multiplied by the data transmission magnification of the outermost circle of the digital multi-function disc. The type of the multifunctional light beam is a second type; and if the The frequency of the wobble signal is between a third frequency multiplied by the data transmission magnification of the innermost circle of the digital multi-function disc and the third frequency multiplied by the data transmission magnification of the outermost circle of the digital multi-function disc. The type of the multi-function disc is a third type.

The foregoing digital multi-function disc type determination method, wherein the second frequency is

140. 6KHz, the third frequency is 817.5KHz, in addition the first type is DVD-ROM, the second type is DVD-, and the third type is DVD +.

The foregoing method for determining the type of a digital multi-function optical disc, wherein the step (b) further includes: calculating the wobble by taking a time required by the spindle motor of the optical disc drive to rotate the digital multi-function disc by a predetermined number of revolutions as a unit time. The frequency of the signal.

In the foregoing method for determining the type of a digital multifunctional optical disc, the step (b) further includes: dividing the wobble signal by a division factor; and the frequency of the wobble signal calculated in step (b) is to divide The frequency of the wobble signal after the frequency.

In the foregoing method for determining the type of a digital multi-function disc, the step (b) further includes: if the frequency of the wobble signal after the frequency division is smaller than the first frequency, determining the type of the digital multi-function disc as the first Type; if the frequency of the wobble signal after frequency division is located at the second frequency multiplied by the innermost data transmission rate of the digital multi-function disc multiplied by the frequency division factor, and the second frequency multiplied by the digital multi-function disc The data transmission ratio of the outermost circle is multiplied by the frequency division factor, it is determined that the type of the digital multifunctional optical fiber is the second type; and if the frequency of the wobble signal after frequency division is located at the third frequency multiplied by The data transmission magnification of the innermost circle of the digital multi-function disc is multiplied by the frequency division factor, and the third frequency is multiplied by the data transmission magnification of the outermost circle of the digital multi-function disc by the frequency division factor. The type of the digital versatile disc is this third type.

The object of the present invention and its technical problems are also achieved by the following technical solutions. According to the present invention, a digital multi-function disc type judging device includes: an acquisition device, which captures a wobble signal from a digital multi-function disc, digitizes the wobble signal, and outputs the digitized wobble signal And a judging device, coupled to the capturing device, judging and outputting the type of the digital multifunctional optical disc according to the frequency of the wobble signal.

The objective of the present invention and its technical problems can be further achieved by using the following technical measures. The foregoing digital multifunctional disc type determination device further includes: a filter coupled to the input end of the determination device, receiving the digitized wobble signal, filtering out noise of the wobble signal, and outputting filtering noise The wobble signal after the signal; a frequency counter coupled to the filter, calculating and outputting the frequency of the wobble signal according to the wobble signal after filtering out noise; and a judger coupled to the frequency counter The device judges and outputs the type of the digital multi-function disc according to the frequency of the wobble signal.

In the aforementioned digital multifunctional disc type determining device, the frequency counter also receives an activation signal, and determines when to start calculating the frequency of the wobble signal according to the activation signal. In addition, the frequency counter also receives A speed signal sent by a spindle motor, and according to the speed signal The frequency of the wobble signal is calculated by taking the time required for the spindle motor to drive the digital multi-function disc to rotate a preset number of revolutions as a unit time.

'' The aforementioned digital multi-function disc type determination device, wherein the judgement is that when the frequency of the wobble signal is less than a first frequency, the type of the digital multi-function disc is a first type; in addition, the determiner is When the frequency of the wobble signal is between a second frequency multiplied by the data transmission magnification of the innermost circle of the digital multi-function disc and the second frequency multiplied by the data transmission magnification of the outermost circle of the digital multi-function disc, The type of the digital multi-function disc is a second type; in addition, the determiner is a third frequency multiplied by the data transmission magnification of the innermost circle of the digital multi-function disc at the frequency of the wobble signal and multiplied by the third frequency. When the data transmission magnification of the outermost circle of the digital multi-function disc is determined, the type of the digital multi-function disc is determined to be a third type.

The foregoing digital multi-function disc type determining device, wherein the second frequency is

140.6KHz, the third frequency is 817.5Hz, and the first type is DVD-ROM, the second type is DVD-, and the third type is DVD +.

The foregoing digital multi-function optical disc type judging device, wherein the judging device further includes: a frequency divider coupled between the filter and the frequency counter, and receiving the filtered noise output by the filter. The wobble signal is frequency-divided by a frequency dividing factor, and the wobble signal after frequency division is output to the frequency counter.

In the foregoing digital multi-function disc type determining device, the judging device judges that the type of the digital multi-function disc is the first type when the frequency of the wobble signal is less than the first frequency; The frequency of the wobble signal is located at the second frequency multiplied by the data transmission magnification of the innermost circle of the digital versatile disc multiplied by the frequency division factor, and the second frequency multiplied by the data transmission magnification of the outermost circle of the digital versatile disc. When multiplied by the frequency division factor, it is judged that the type of the digital multi-function disc is the second type; in addition, the frequency of the wobble signal is located at the third frequency multiplied by the innermost circle of the digital multi-function disc Multiplying the data transmission magnification by the frequency division factor and the third frequency multiplied by the data transmission magnification of the outermost circle of the digital multifunctional disc by the frequency dividing factor, determining the type of the digital multifunctional disc as the The third category.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. It can be known from the above technical solutions that, in order to achieve the foregoing object of the present invention, a preferred embodiment of the present invention proposes a method for determining the type of a digital multi-function optical disc. The main steps include: setting related parameters, and capturing from a digital multi-function optical disc. A wobble signal, and a frequency division factor is set to divide the above-mentioned wobble signal by the frequency division factor. Then, the time required for the digital multi-function disc to rotate once by the spindle motor of the optical disc drive as a unit time is used to calculate the frequency of the wobble signal after the frequency division. Finally, according to the frequency of the wobble signal after frequency division, the type of the digital multi-function disc is determined.

In order to achieve the above and other contents, another preferred embodiment of the present invention further proposes a digital multifunctional disc type judging device, including: an acquisition device, which captures a wobble signal from a digital multifunctional disc, and swings the wobble signal Digitize and output a digitized wobble signal; and a judgment device It is coupled to the above-mentioned capturing device, and judges and outputs the type of the digital multi-function optical disc according to the frequency of the wobble signal. The judgment device further includes: a filter coupled to the input end of the judgment device, receiving a digital wobble signal, filtering noise of the wobble signal, and outputting the wobble signal after filtering the noise; A frequency counter coupled to the above-mentioned filter, calculating and outputting the frequency of the swing signal based on the noise-filtered swing signal; and a judger coupled to the above-mentioned frequency counter, based on the swing signal High and low frequency, judge and output the type of digital multi-function disc.

In summary, the method and device for determining the type of a digital multi-function optical disc with a special structure of the present invention solve the problem of easy misjudgment and increase the probability of correctly determining the type of a digital multi-function optical disc. It has many of the above advantages and practical values, and has not seen similar designs and methods published or used in similar products and methods. It is indeed an innovation. It has great improvements in both products and functions. It has made great progress, and has produced useful and practical effects, and has a number of improved functions over the existing digital multi-function disc type determination methods and devices, which is more suitable for practical use and has extensive industrial use. Value, sincerely a new, progressive and practical new design.

The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more comprehensible. In the following, a plurality of preferred embodiments are specifically listed and described in detail with reference to the accompanying drawings. Brief description of the drawings

Figure 1 is a schematic diagram of the source of the wobble signal.

Figure 2 is a schematic diagram of a DVD + wobble signal.

Figure 3 is a schematic diagram of a DVD-wobble signal.

FIG. 4 is a flowchart of a conventional method for judging the type of a digital multifunctional optical beam.

FIG. 5 is a frequency range of wobble signals of three digital multi-function optical discs according to an embodiment of the present invention. FIG. 6 is a structural diagram of an embodiment of a digital multi-function disc type judging device according to the present invention. FIG. 7 is a flowchart of an embodiment of a method for determining a type of a digital multi-function optical disc according to the present invention.

A, B, C, D: Four areas of the optical disk drive read / write head

101: Read / write head of DVD player 102: Tracks on DVD disc

201: DVD + wobble signal 202: DVD + wobble signal contains phase change area

301: DVD-Wobble Signal

302: DVD-Wobble Signal Convex Preset Hole

402: Set the relevant parameters for DVD +. 404 Read the current position?

406: DVD + 408 Set DVD-related parameters

410: Did you read the current position? 412 DVD-

414: DVD-ROM 601 capture device

602: judging device 603 604: Frequency divider 605: Frequency counter

606: Evaluator 607: Swing signal

608: Start signal 609: Speed signal

610: Light type signal 702: Set related parameters

704: Capture the wobble signal 706: Set the divide factor to 1/2

708: Divide 710: Calculate the frequency of the wobble signal after division

712: Determine the type of the optical disc according to the frequency after frequency division

714: DVD-ROM 716: DVD-

718: The Best Way to Invent DVD +

In order to further explain the technical means and effects adopted by the present invention to achieve the intended purpose of the present invention, the following describes the method and device for determining the type of a digital multi-function optical disc according to the present invention with reference to the accompanying drawings and preferred embodiments. , Method steps, features and effects, detailed description: ¾ mouth.

The present invention uses a wobbl es igna l frequency of a digital multi-function optical disc (digi ta lversa ti ledi sc, abbreviated as DVD) to distinguish a DVD-ROM ("ROM" in the following stands for read-only memory, also Readonlymemory), DVD-, and DVD +. The following specifically introduces embodiments to describe the method and device for determining the type of a digital multifunctional optical disc according to the present invention.

Different types of DVDs have different wobble signal frequencies. In the case where the data transfer rate is doubled (1349KB / S), the time taken by the spindle motor of the optical disc drive to rotate the disc for a unit of time, Then the wobble signal frequency of DVD + is 817 · 5K ， ζ, and the wobble signal frequency of DVD- is 140.6KΗζ, but DVD-ROM does not record any wobble frequency on the cymbal, so the frequency is zero. This difference in frequency is the basis of the judgment of the present invention.

In devices such as optical disc players, the actual frequency calculation is more complicated. Because optical disc drives mostly use a constant angular rate (cons tantangularveloci ty, CAV) mode, the data transmission ratio of the innermost and outermost circles of the optical disc is obviously Different, that is, 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, then the frequency is divided. The frequency of the wobble signal is 1/2 of the original. Obviously, the wobble signal frequency read in the innermost circle of DVD + should be:

817. 5KHz X innermost data transmission magnification X division factor The frequency of the wobble signal read on the outermost DVD + should be:

817. 5KHz outermost circle data transmission rate X frequency division factor Similarly, the frequency of the wobble signal read on the DVD-inner circle should be:

140. 6KHz innermost data transmission rate X frequency division factor The frequency of the wobble signal read on DVD-outermost circle should be:

140. 6KHz X outermost circle data transmission magnification X division factor In this embodiment, the optical disc drive rotates in a four-speed CAV mode, so the innermost circle data transmission ratio is approximately 2 times, and the outermost circle data transmission about 4-fold magnification, and the frequency dividing factor of ^1/2. After calculation of the tube, we can know that the wobble signal frequency range of DVD + is from KHz to 1.6MHz, the wobble signal frequency range of DVD- is from HOKHz to 280KHz, and DVD-ROM is 0, as shown in Figure 5. In fact, the DVD-ROM may have a small wobble signal frequency due to the error of the real environment, which will not affect the judgment of the present invention.

Please refer to FIG. 5, which shows the wobble signal frequency range of three digital multi-function discs according to an embodiment of the present invention. Under the premise of fixed speed, the frequency ranges of the three types of optical discs do not overlap, and they are far apart. Therefore, there is no need to worry about reading different wobble frequencies at different positions on the disc and causing misjudgment.

Please refer to FIG. 6 and FIG. 7. FIG. 6 is a structural diagram of an embodiment of a digital multi-function disc type judging device according to the present invention, and FIG. 7 is an embodiment of a digital multi-function disc type judging method according to the present invention. flow chart. This embodiment includes a frequency division operation. All relevant numbers and details have taken frequency division into consideration. In fact, this operation can be omitted. If the frequency is not divided, the frequency range of the wobble signal in Fig. 5 must be removed. In the following device architecture diagram (Fig. 6), the relevant components of the frequency division must be removed. The following method flowchart (Fig. 7) In addition, the steps related to frequency division must also be removed.

Please refer to FIG. 6, the capturing device 601 captures the wobble signal 607 from the digital multi-function disc, digitizes the wobble signal 607 and outputs it to the judging device 602. The judging device 602 judges the type of the digital multi-function disc according to the frequency of the swing signal 607, and outputs the type signal 610 of the disc.

The judging device 602 includes several components. First, the filter 603 receives a digitalized wobble signal 607, filters out the noise of the wobble signal, and outputs the filtered wobble signal to the frequency divider 604 (of course, in the When the noise is not large or does not cause difficult judgment, the filter 603 can be omitted. The frequency divider 604 divides the wobble signal by a preset frequency division factor (1/2 in this embodiment), and outputs the frequency division. The post-frequency swing signal is provided to the frequency counter 605.

Next, the frequency counter 605 will receive the rotation speed signal 609 sent by the spindle motor (not shown) of the optical disc drive, and according to the rotation speed signal 609, the time required for the spindle motor to drive the digital multi-function disc to rotate once is taken as a unit. Time, calculate the frequency of the wobble signal after frequency division, and output this frequency to the judger 606. The function of the start signal 608 is to notify the frequency counter 605 when to start calculating the frequency. Finally, the judger 606 judges the type of the digital multi-function disc according to the frequency of the frequency output from the frequency counter 605 and the frequency range of various discs shown in FIG. 5 and outputs the disc type. Class signal 610.

Please refer to FIG. 7. First, step 702 sets related parameters, and step 704 captures a wobble signal from a digital multi-function disc. Then step 706 will set the frequency division factor (for example, it can be set to 1/2 in the above example), and step 708 will use the frequency division factor to divide the wobble signal. Next, in step 710, the time required by the spindle motor of the optical disc drive to drive the digital multi-function disc to rotate once is taken as a unit time to calculate the frequency of the wobble signal after the frequency division.

After the frequency is calculated, step 712 determines the type of the optical disc according to the frequency of the wobble signal after the frequency division. If the frequency is zero, step 714 determines the type is a digital versatile disc DVD-R0M _o If the frequency is between 280kHz and 140KHZ, step 716 determines the type is a digital versatile disc DVD -. If the frequency is between 800 KHz and 1.6 MHz, step 718 determines that the type of the digital multi-function disc is DVD +.

Here, if the multi-function disc is DVD + or DVD-, the common frequency division factor is 2/23 or 1/2. That is, after using a certain frequency division factor, if the content of the multifunctional disc cannot be determined successfully, another frequency division factor can be used for calculation.

As can be seen from the above description, the present invention determines the type of the digital multi-function disc according to the frequency of the wobble signal, rather than the position information contained in the wobble motion as in the prior art, so the shortcomings of the prior technology that can be easily misjudged can be avoided. Increase the probability of correctly judging the type of digital versatile disc.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above with the preferred embodiments, they are not intended to limit the present invention. Technical personnel, without departing from the scope of the technical solution of the present invention, when the method and technical content disclosed above can be used to make a few changes or modifications to equivalent equivalent embodiments, but without departing from the content of the technical solution of the present invention, Any simple modifications, equivalent changes, and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention. Industrial applicability

With the above technical solution, the method and device for determining the type of a digital multi-function optical disc of the present invention have at least the following advantages:

The present invention judges the type of the digital multi-function optical disc according to the frequency of the wobble signal, rather than the position information contained in the wobble motion as in the prior art, so it can avoid the previous technology's easy misjudgment and the difficulty of providing all optical disc drives. The shortcomings of information increase the probability of correctly judging the type of digital versatile disc.

Claims

Rights request

1. A method for determining the type of a digital multi-functional optical fiber, which is characterized in that it includes the following steps:

(a) capturing a wobble signal from a digital versatile disc; and

(b) judging the type of the digital versatile disc according to the frequency of the wobble signal.

2. The method for determining the type of a digital multi-function disc according to claim 1, wherein step (b) further comprises:

If the frequency of the wobble signal is less than a first frequency, determining that the type of the digital multi-function disc is a first type;

If the frequency of the wobble signal is between a second frequency multiplied by the data transmission magnification of the innermost circle of the digital multi-function disc and the second frequency multiplied by the data transmission magnification of the outermost circle of the digital multi-function disc, then judge The type of the digital versatile disc is a second type; and

If the frequency of the wobble signal is between a third frequency multiplied by the data transmission magnification of the innermost circle of the digital multi-function disc and the third frequency multiplied by the data transmission magnification of the outermost circle of the digital multi-function disc, then judge The type of the digital multifunctional optical fiber is a third type.

3. The method for determining the type of a digital multi-function optical disc according to claim 2, wherein the second frequency is 140.6KHz, the third frequency is 817.5KHz, and the first type is DVD-ROM , The second type is DVD-, and the third type is DVD +.

4. The method for determining the type of a digital multi-function optical disc according to claim 1, wherein step (b) further comprises:

Calculate the frequency of the wobble signal by taking the time required for the digital multi-function disc to rotate a preset number of turns as the unit time by the spindle motor of the optical disc drive.

5. The method for determining the type of a digital multi-function optical disc according to claim 4, wherein the step (b) further comprises:

Divide the wobble signal by a division factor;

The frequency of the wobble signal calculated in step (b) is the frequency of the wobble signal after frequency division.

6. The method for determining the type of a digital multi-function optical disc according to claim 5, wherein said step (b) further comprises:

If the frequency of the wobble signal after frequency division is smaller than the first frequency, determining that the type of the digital multifunctional optical disc is the first type;

If the frequency of the wobble signal after frequency division is located at the second frequency multiplied by the data transmission magnification of the innermost circle of the digital versatile disc multiplied by the frequency division factor, and the second frequency multiplied by the outermost portion of the digital versatile disc Multiplying the data transmission magnification of the ring by the frequency division factor, determining that the type of the digital versatile disc is the second type; and

If the frequency of the wobble signal after division is at the third frequency multiplied by the digital multi-function disc The data transmission magnification of the innermost circle is multiplied by the frequency division factor, and the third frequency is multiplied by the data transmission magnification of the outermost circle of the digital multi-function disc multiplied by the frequency division factor. The kind is this third kind.

7. A digital multi-function optical disc type judging device, characterized in that it comprises: an acquisition device to throw a wobble signal from a digital multi-function disc, digitize the wobble signal, and output the digitalized wobble signal ; as well as

A judging device is coupled to the capturing device, and judges and outputs the type of the digital multi-function disc according to the frequency of the wobble signal.

8. The digital multi-function disc type judging device according to claim 7, further comprising:

A filter coupled to the input end of the judging device, receiving the digitized wobble signal, filtering the noise of the wobble signal, and outputting the wobble signal after filtering the noise;

A frequency counter coupled to the filter, calculating and outputting the frequency of the wobble signal according to the wobble signal after filtering out noise; and

A judging device is coupled to the frequency counter, and judges and outputs the type of the digital multifunctional optical disc according to the frequency of the wobble signal.

9. The digital multi-function disc type judging device according to claim 8, wherein the frequency counter also receives an activation signal, and uses the activation signal to determine when to start calculating the frequency of the wobble signal, and The frequency counter also receives a rotation speed signal sent by a spindle motor of the optical disc drive, and calculates, based on the rotation speed signal, the time required for the spindle motor to drive the digital multi-function disc to rotate a preset number of revolutions as a unit time, and calculates The frequency of the wobble signal.

10. The digital multi-function disc type judging device according to claim 9, wherein the judging device judges that the type of the digital multi-function disc is one when the frequency of the wobble signal is less than a first frequency. The first type; in addition, the judgement is that the frequency of the wobble signal is located at a second frequency multiplied by the data transmission magnification of the innermost circle of the digital multi-function disc, and the second frequency is multiplied by the outermost of the digital multi-function disc. When the data transmission magnification is between, the type of the digital multi-function disc is judged to be a second type; in addition, the determiner is the data where the frequency of the wobble signal is located at a third frequency multiplied by the innermost circle of the digital multi-function disc When the transmission magnification is multiplied by the third frequency multiplied by the data transmission magnification of the outermost circle of the digital versatile disc, the type of the digital versatile disc is determined to be a third type.

11. The digital multi-function disc type determining device according to claim 10, wherein the second frequency is 140.6 KHz, the third frequency is 817.5 KHz, and the first type is DVD-ROM , The second type is DVD-, and the third type is DVD +.

12. The digital multi-function disc type judging device according to claim 10, wherein the judging device further comprises:

A frequency divider is coupled between the filter and the frequency counter, and receives a filter output by the filter. The wobble signal after noise is removed, the wobble signal is divided by a frequency dividing factor, and the wobble signal after frequency division is output to the frequency counter.

13. The digital multi-function disc type judging device according to claim 12, wherein the judging device judges that the type of the digital multi-function disc is when the frequency of the wobble signal is less than the first frequency. The first type; in addition, the judgement is that the frequency of the wobble signal is located at the second frequency multiplied by the data transmission magnification of the innermost circle of the digital multi-function disc multiplied by the frequency division factor, and the second frequency is multiplied by the digital When the data transmission magnification of the outermost circle of the multifunctional disc is multiplied by the frequency division factor, it is determined that the type of the digital multifunctional disc is the second type; in addition, the judging device is located at the third frequency at the frequency of the wobble signal. Multiplying the data transmission magnification of the innermost circle of the digital multi-function disc by the frequency division factor, and multiplying the third frequency by the data transmission magnification of the outermost circle of the digital multi-function disc by the frequency division factor, It is determined that the type of the digital multifunctional light beam is the third type.