WO2005117009A1

WO2005117009A1 - Method of judging the type of digital versatile disc

Info

Publication number: WO2005117009A1
Application number: PCT/CN2004/001531
Authority: WO
Inventors: Bryan Tai
Original assignee: Via Technologies, Inc.
Priority date: 2004-05-25
Filing date: 2004-12-27
Publication date: 2005-12-08
Also published as: RU2006140292A; CN100367367C; CN1312690C; TW200539114A; BRPI0418821A; TWI340964B; TWI253060B; TWI307494B; TW200539116A; CN1700311A; CN1637909A; RU2006141413A; TW200539115A; CN1601639A; CN1324597C

Abstract

The present invention relates to a method of judging the type of digital versatile disc (DVD) to discriminate it is DVD-ROM (Read Only Memory DVD), DVD-R Once Recordable DVD, including DVD-R and DVD+R) or DVD-RW (Rewritable many times DVD, including DVD-RW and DVD+RW), the main steps include: reading out a tracking error signal from DVD disc, if the amplitude of the tracking error signal is over a first predetermined value, then it is judged that the disc is DVD-R, else reading out a RECD signal, if the RECD signal is zero, then determining that the disc is blank DVD-RW, else reading out a total strength signal, if the total strength signal is over a second predetermined value, then determining that the disc is DVD-ROM, else determining that the disc is DVD-RW which has been recorded with some information.

Description

Digital multi-disc disc judging method TECHNICAL FIELD

The present invention relates to a method for judging the type of a digital multi-function optical disc, and more particularly to a method for judging the type of a digital multi-function disc that distinguishes a read-only type, a single-write type, and a multiple-write type. Background technique

Digital versatile disc (DVD) is a very common data storage format. It was first used to store videos. Later it was gradually used to store other data, such as programs and files used on personal computers. Traditional read-only optical discs cannot meet the needs of backup programs and files. Therefore, many types of digital multi-function discs that can record data have been derived. The common types are as follows:

1. A read-only digital multi-function disc, referred to as DVD ROM, where ROM stands for read-only memory, that is, read only memory »This type of optical disc can only be read and cannot be used to burn data.

2. Single-write digital multi-function discs are divided into DVD-R and DVD + R specifications, where R means recordable. As the name implies, this disc can only be burned once.

3. Multi-burning digital multi-function discs are divided into two specifications: DVD-RW and DVD + RW, which means re- _W ritable. This disc can be re-burned and is the most convenient to use.

For the convenience of users, various manufacturers have optical disc drives compatible with a variety of digital versatile discs. However, the reading and writing methods of each digital function disc are different, so the first one after the user inserts the disc The matter is to judge the type of the optical disc, that is, to distinguish between a read-only type, a single-write type, and a multiple-write type digital multi-function disc.

The traditional method is to judge the disc type in two stages. The first stage is to use the amplitude of the focus error signal to separate the multi-burning digital multi-function disc. First, turn on the laser beam of the optical disc drive, and then move the pick-up head (PUH for short) to generate a focus error signal. The amplitude of the focus error signal is directly proportional to the reflectivity of the disc, and the reflectivity of the multi-burning digital multi-function disc is the lowest, so it can be separated using a smaller focus error signal amplitude.

Please refer to FIG. 1, the focus error signal is a curve labeled 101, 102 is the limit value of a read-only and single-write digital multi-function disc, 103 is the limit value of a multi-write digital multi-function disc . As long as the peak-to-peak voltage of the focus error signal is less than the limit value 103 of the multi-burning digital multi-function disc, it can be judged that the previously inserted disc is a multi-burning digital multi-function disc .

After the multi-burning digital versatile disc is divided, the second stage of the traditional method is to use land pre-pit iiif ormation unique to DVD-R and DVD-RW, and DVD + R and DVD + RW unique address in pre-groove informat ion) to distinguish between read-only and single-write digital versatile discs. Multi-burning digital multi-function discs have been distinguished in the first stage and need not be considered at this stage. Therefore, as long as the embossed preset hole data or preset slot address data can be read, it is a single-write digital multi-function disc, otherwise it is a read-only digital multi-function disc.

Please refer to FIG. 2, which is a flowchart of a method for judging the type of a digital versatile disc according to the prior art. As for the detailed steps of the traditional judgment method, first, step 202 turns on the laser beam, moves the read-write head up and down to generate a focus error signal, then step 204 detects the maximum and minimum values of the focus error signal, and step 206 checks Whether the peak-to-peak voltage of the focus error signal is less than the limit of no disc. If yes, step 208 determines that no optical disc is placed in the optical disc drive.

If the peak-to-peak voltage of the focus error signal is greater than or equal to the limit of the disc-less disc, the next step 210 is to check whether the peak-to-peak voltage of the focus error signal is less than the limit of the multi-burning digital multi-function disc. If so, step 212 determines that the inserted optical disc is a multi-burning digital multi-function disc.

After distinguishing the multi-burning type digital multi-function disc, step 214 will perform actions such as cal ibrat ion and tracking. This is to prepare for the subsequent reading of data. Next, step 216 checks whether the inserted disc can read the embossed preset hole data or the preset slot address data. If it can, step 218 determines that the inserted disc is a single-burning digital multi-function disc, otherwise In step 220, the inserted optical disc is judged to be a read-only digital multi-function optical disc.

Traditional judgment methods have many disadvantages. One is that when the quality of the read / write head is not good, the quality of the read focus error signal also decreases (such as the deviation of the signal amplitude), so the probability of misjudgment is increased. The second is that occasionally a multi-burning digital multi-function disc with a particularly high reflectance, or a read-only or single-burning digital multi-function disc with a particularly low reflectance, and the traditional method is likely to be wrong at this time. Sentence. Third, if it is difficult to read the embossed preset hole data or preset slot address data due to hardware or firmware problems, single-write or multi-write digital multi-function discs are likely to be Misjudged as a read-only digital versatile disc. The fourth disadvantage is that the step of reading the embossed preset hole data and the preset slot address data is located in the middle of the servo-on proces s, so the read-only digital multi-function disc must go through many steps to The type is determined, and after the type of the disc is determined, it is necessary to re-enter the startup process to read the disc, which will waste a lot of time.

From the above description, we know that we need a better method to overcome the many shortcomings of traditional methods, improve the accuracy of judgment, and shorten the judgment time.

It can be seen that there are still many shortcomings in the above existing digital multi-function disc type determination methods, and further improvements are urgently needed. In order to solve the shortcomings of the existing methods for determining 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. This is obviously a problem that the relevant industry is anxious to solve. .

There are defects in the above-mentioned existing digital multi-function disc type determination method, and the present invention Based on many years of rich practical experience and professional knowledge in the design and manufacture of such products, people actively research and innovate in order to create a new digital multi-function disc type judgment method, which can improve the existing digital multi-function disc type judgment methods. Make it more practical. After continuous research, design, and repeated trial and error and improvement, the invention has finally been 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 enable it to overcome the disc and read and write The influence of factors such as head quality improves the accuracy of judgment, and shortens the time required to judge a read-only digital multi-function disc, which is more suitable for practical use and has industrial use value.

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 disc according to the present invention includes the following steps: reading a tracking error signal from a digital multi-function disc; and if the amplitude of the tracking error signal is greater than a first preset value , It is judged that the digital multi-function disc is a single-write digital multi-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 multi-function disc, the tracking error signal generation method is selected from one of the following: a differential push-pull method and a differential phase detection method.

The foregoing method for determining the type of a digital multi-function disc further includes: reading a RECD signal from the digital multi-function disc; and if the RECD signal is zero, determining that the digital multi-function disc is a blank multi-burning type Digital Versatile Disc.

The foregoing method for determining the type of a digital multifunctional optical disc, wherein the ¹ RECD signal is generated by analyzing an RF signal from the digital optical disc, and if the RF signal strength is greater than a predetermined value, the RECD signal is set Is high or its value is one, otherwise the RECD signal is set to low or its value is zero.

The foregoing method for determining the type of a digital multi-function disc further includes: reading a total intensity signal from the digital multi-function disc; and if the total intensity signal is greater than a second preset value, determining that the digital multi-function disc is only Read the digital multi-function disc, otherwise it is judged that the digital multi-function disc is a multi-burning type digital multi-function disc that has already recorded data.

In the foregoing method for determining the type of a digital multifunctional optical disk, the total intensity signal is a sum of at least one signal obtained by detecting the digital multifunctional optical disk by an optical pickup.

The object of the present invention and its technical problems are also achieved by the following technical solutions. A method for determining the type of a digital multifunctional optical disc according to the present invention includes the following steps: reading a tracking error signal from a digital multifunctional disc; and when the size of the tracking error signal is greater than a critical value, The digital versatile disc is judged to be a single-write digital versatile 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 multi-function optical disc, the tracking error signal generation method is selected from one of the following: differential push-pull and differential phase detection.

The object of the present invention and its technical problems are also achieved by the following technical solutions. A method for determining the type of a digital multifunctional optical disc according to the present invention includes the following steps: A multi-function disc reads a RECD signal; and if the RECD signal is zero, it is determined that the digital multi-function disc is a blank multi-burning digital multi-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 multi-function optical disc, the RECD signal is generated by analyzing an RF signal from the digital optical disc. If the intensity of the RF signal is greater than a predetermined value, the RECD signal is set as High or its value is one, otherwise set the RECD signal to low or its value to order.

The object of the present invention and its technical problems are also achieved by the following technical solutions. A method for determining the type of a digital multifunctional disc according to the present invention includes the following: reading a total intensity signal from a digital multifunction disc; and determining the digital multifunction if the total intensity signal is greater than a preset value The optical disc is a read-only digital multi-function disc, otherwise it is determined that the digital multi-function disc is a multi-burning type digital multi-function disc that has been recorded with data.

The object of the present invention and its technical problems are further achieved by the following technical measures. In the foregoing method for determining the type of a digital multifunctional optical disc, the total intensity signal is a sum of at least one signal obtained by detecting the digital multifunctional optical disc by an optical reading head.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. It can be known from the foregoing technical solutions that, in order to achieve the foregoing objectives of the present invention, the main technical contents of the present invention are as follows:

The present invention provides a method for determining the type of a digital multi-function disc. The main steps are: reading a tracking error signal from a digital multi-function disc; if the amplitude of the tracking error signal is greater than a first preset value, determining the above-mentioned The digital multi-function disc is a single-write digital multi-function disc; otherwise, a RECD signal is read. If the RBCD signal is zero, it is judged that the digital multi-function disc is a blank multi-burning digital multi-function disc; Otherwise, read a total intensity signal. If the total intensity signal is greater than the "-" second preset value, determine that the digital multi-function disc is a read-only digital multi-function optical butterfly. Otherwise, determine that the data has been burned multiple times. According to another point of view, the present invention further proposes several types of digital multi-function disc type judgment methods, each of which includes the following main steps: judging whether a digital multi-function disc is single or not according to a tracking error signal. Multi-burning digital multi-disc; according to a RECD signal, determining whether the above-mentioned digital multi-function optical disk is blank or not Versatile discs; and judging the type of digital Versatile discs based on a total intensity signal among multiple-recorded digital Versatile discs and read-only digital Versatile discs that have recorded data.-By the above technology Solution, the present invention has at least the following advantages: The digital multi-function optical disc type determination method of the present invention uses a judgment basis different from that of the prior art, and the signal used for the judgment is less susceptible to changes in the quality of the disc and the read / write head. In addition, the method proposed by the present invention can distinguish a read-only digital multi-function disc at the beginning of the startup program. Unlike the prior art, it takes time to perform tracking and calibration steps. Therefore, it can overcome the shortcomings of the prior art, and has extremely High judgment accuracy, and can significantly reduce the time required to judge a read-only digital versatile disc. In summary, the special digital multi-function disc type determination method of the present invention has extremely high judgment accuracy, and can greatly reduce the time required to judge a read-only digital multi-function disc. It has many of the above advantages and practical values, and has not seen similar designs published or used in similar methods. It is indeed an innovation. It has made great improvements in both methods and functions. Great progress has produced useful and practical effects, and it has a number of improved functions over the existing digital multifunctional optical fiber type determination methods, making it more suitable for practical use, and has a wide range of industrial use value. Sincerely A new, progressive and practical new design.

The above description is only an overview of the technical solutions of the present invention. In order to understand the technical means of the present invention more clearly and can be implemented in accordance with the contents of the description, the following describes in detail the preferred embodiments of the present invention and the accompanying drawings. Brief description of the drawings

FIG. 1 is a schematic diagram of a focus error signal.

FIG. 2 is a flowchart of a method for judging a type of a digital versatile disc according to the prior art.

FIG. 3 is a flowchart of an embodiment of a method for determining a type of a digital multi-function disc according to the present invention. 101: Focus error signal

102 Limits for read-only and single-write digital versatile discs

103 Limitations of Multi-Recording Digital Versatile Discs

202 Generate focus error signal

204 Detecting the size of the focus error signal

206 The peak-to-peak voltage is less than the limit of the matte diaphragm?

208 no disc

210 The peak-to-peak voltage is less than the limit of the multi-burning digital versatile disc?

212 Multi-programming digital multi-function optical card

214 Correction and tracking actions

216 Can read convex preset hole data or preset slot address.

218 Single-write digital. Versatile disc ''

220 Read Only Digital Versatile Disc

302 Read tracking error signal

30 Is the amplitude of the tracking error signal greater than the preset value?

306 single-write digital versatile disc

308: Read the RECD signal

310: RECD = 0?

312 Blank Multi-Recording Digital Versatile Disc

314 Read total intensity signal

316 Is the total intensity signal greater than the preset value? 318: Read Only Digital Versatile Disc

320: Multi-Recording Digital Versatile Disc with Burned Data Best Way to Realize Invention

The specific method steps, features and functions of the digital multi-function disc type judging method proposed in accordance with the present invention will be described in detail below with reference to the drawings and preferred embodiments.

The method for judging the type of a digital versatile disc (digi tal versat i le di sc (abbreviated to DVD)) proposed by the present invention is described below in a preferred embodiment. This embodiment distinguishes a read-only digital versatile disc (DVD ROM, ROM is an abbreviation of read only memory), a single-write digital versatile disc (DVD-R and DVD + R) in three stages, and Multi-Recording Digital Versatile Disc (DVD-RW and DVD + RW). The three steps are explained below.

The first stage is to distinguish single-write digital multi-function discs by using the amplitude of the tracking error signal before the track is locked. There are two ways to generate the tracking error signal. The default method is differential ial push-pull (DPP), which is based on the reflected beams read from the various areas on the pick-up head. The difference in intensity is used to calculate the tracking error signal. The other method is differential phase detection (DPD), which calculates the tracking error signal based on the phase difference of the reflected beam read from each area of the read / write head. These two methods (DPP and DPD) are all known: 支支术, which will not be described in detail here.

According to the specifications of the three types of DVDs, the track pitch of the read-only digital versatile disc is small and close to a perfect circle, so the tracking error signal generated is very small. The multi-burning type digital multi-function disc has a very small tracking error signal due to the low reflectivity and the relationship between the initial gain setting and initial gains setting. However, the tracking error signal of a single-write digital multi-function disc is larger than that of the other two types. Therefore, it is easy to correctly determine a single-write digital versatile disc.

The second stage of this embodiment is to use the RECD signal to distinguish blank multi-burning digital multi-function discs. Here, the RECD signal is a signal generated by detecting the laser light reflected from the optical disc. Because the stored data will change the characteristics of the stored data portion of the optical disc, the RF signal generated by the stored optical disc will be larger than that of the optical disc without stored data. In this way, the RECD signal is generated by analyzing the size of the RF signal from the optical disc. If the RF signal value is greater than a predetermined value, the RECD signal is set to "high" or its value is one, otherwise it is set to "low" or Its value is zero. Therefore, in this embodiment, it is possible to directly distinguish whether the multi-burning digital multi-function disc is blank through the RECD signal.

The third stage of this embodiment is to use the RF level signal, that is, the sum of the reflection intensities read by each area of the read-write head, to distinguish between read-only and multiple-time recording of already-recorded data. Digital versatile disc. Because the burning process will change the physical shield of the DVD surface material, the reflectivity of DVDs that have not been burned varies widely, resulting in multiple burns of already burned data The total intensity signal of a digital multi-function disc is much smaller than that of a read-only digital multi-function disc, so it is easy to accurately distinguish between the two types. Here, the RF level signal refers to the sum of the signals obtained by the optical pickup head (which can be the sum of all signals or the sum of some signals).

Please refer to FIG. 3, which is a detailed process of this embodiment. First, step 302 reads the tracking error signal from the digital multi-function disc that needs to be determined, and then step 304 checks whether the amplitude of the tracking error signal is greater than a predetermined value. If so, step 306 determines that the result of the determination is a single-write digital multi-function optical disk. So far, this is the first stage mentioned above.

If it is not a single-write digital versatile disc, step 308 reads the RECD signal from the digital versatile disc described above, and then step 310 checks whether the RECD signal is zero. If so, step 312 determines the multi-burning digital multi-function light source whose judgment result is blank. From step 308 to here, it is the second phase mentioned above.

If the multi-burning digital multi-function disc is not blank, step 314 will read the total intensity signal from the above-mentioned digital multi-function disc, and then step 316 will check whether the total intensity signal is greater than a preset value. Set the value different from step 304. If so, step 318 determines that the judgment result is a read-only digital multifunctional optical table, otherwise step 320 determines that the judgment result is a multi-burning digital multifunctional disc that has recorded data. From step 314 to here, this is the third stage described above.

As can be seen from the description of the above embodiments, the judgment basis of the present invention is the tracking error signal, the RECD signal, and the total intensity signal, which are completely different from those used in the prior art. These three signals are less susceptible to the quality of the disc and the read / write head. And other factors, and the difference in signal size between different types of DVD discs is also obvious. In addition, the signals used in the present invention are all related to the size of the signal reflected by the laser from the disc, and unlike the embossed preset hole data and preset slot address data used in conventional technology, further analysis is required. Only the signals reflected from the optical disc can be known, so the present invention can distinguish the read-only digital multi-function disc at the beginning of the servo-on process. Unlike the prior art, it takes time to track and Calibration (cal ibrat ion) and other steps. Therefore, the present invention can overcome the shortcomings of the prior art, has extremely high judgment accuracy, and can greatly reduce the time required for judging a read-only digital multi-function disc.

In addition, although the above embodiment uses the tracking error signal, the RECD signal, and the total intensity signal in order to distinguish the type of the new optical diaphragm, the present invention is not limited to this. In other embodiments of the present invention, only the tracking error signal, the RECD signal, or the total intensity signal may be used to determine the type of the optical disc, or at least two of the above three signals may be used to determine the type of the optical disc in any order. The few differences are that the more types of signals are used, the better the type of photocell can be judged; moreover, when the same signals are used in different orders, the effect of the judgment may be different.

The above description is only the preferred embodiments of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with the preferred embodiments, it is not intended to limit the present invention. It is clear that any person skilled in the art can use the disclosed method and technical content to make a few changes or modifications to the equivalent embodiments without departing from the scope of the technical solution of the present invention. The content of the technical solution of the present invention, and 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 applications,)

The digital multi-function optical disc type determination method of the present invention uses a different judgment basis than the prior art, and the signals used for the determination are less susceptible to variables such as the quality of the disc and the head, and the method proposed by the present invention can be started at At the beginning of the program, a read-only digital multi-function disc is distinguished. Unlike the prior art, it takes time to perform tracking and calibration steps. Therefore, the shortcomings of the prior art can be overcome, the judgment accuracy is extremely high, and the time required for judging a read-only digital multi-function disc can be greatly reduced.

Claims

Rights request

1. A method for determining the type of a digital multi-function disc, comprising: the following steps: reading a tracking error signal from a digital multi-function disc; and

If the amplitude of the tracking error signal is greater than a first preset value, it is determined that the digital multi-function disc is a single-write digital multi-function disc.

2. The method for determining the type of a digital multi-function optical disc according to claim 1, wherein the generation method of the tracking error signal is selected from one of the following: a differential push-pull method and a differential phase detection method.

3. The method for determining the type of a digital multi-function optical disc according to claim 1, further comprising:

Reading a RECD signal from the digital versatile disc; and

If the RECD signal is zero, it is determined that the digital versatile disc is a blank multi-burning digital versatile disc.

4. The method for determining the type of a digital multi-function optical disc according to claim 3, wherein the RECD signal is generated by analyzing an RF signal from the digital disc, and if the RF signal strength is greater than one If it is a predetermined value, the RECD signal is set to high or its value is one; otherwise, the RECD signal is set to low or its value is zero.

5. The method for determining the type of a digital multi-function disc according to claim 3, further comprising:

Read a total intensity signal from the digital versatile disc; and

If the total intensity signal is greater than a second preset value, it is judged that the digital multi-function disc is a read-only digital multi-function disc; otherwise, it is judged that the digital multi-function disc is a multi-recording type of digital data that has been recorded. Function disc.

6. The method for determining the type of a digital multi-functional optical disk according to claim 5, wherein the total intensity signal is for at least one signal obtained by the optical read head to detect the digital multi-functional optical disk. Force p total.

7. A method for determining the type of a digital multi-function disc, which comprises the following steps: reading a tracking error signal from a digital multi-function disc; and

When the size of the tracking error signal is greater than a critical value, it is determined that the digital multi-function disc is a single-write digital multi-function disc.

8. The method for determining the type of a digital multi-function optical disc according to claim 7, wherein the method of generating the tracking error signal is selected from one of the following: differential push-pull and differential phase detection.

9. A method for determining the type of a digital multi-function disc, which comprises the following steps: reading a RECD signal from a digital multi-function disc; and

If the RBCD signal is zero, it is judged that the digital multi-function disc is a blank multi-burning digital multi-function light.

10. The method for determining the type of a digital multi-function optical disc according to claim 9, wherein the RECD signal is generated by analyzing an RF signal from the digital disc, and if the RF signal strength is greater than one For a predetermined value, the RECD signal is set to high or its value is one, otherwise the RECD signal is set to low or its value is zero.

11. A method for determining the type of a digital multi-function disc, which is characterized in that it includes the following: reading a total intensity signal from a digital multi-function disc; and

If the total intensity signal is greater than a preset value, the digital multi-function disc is determined to be a read-only digital multi-function disc; otherwise, the digital multi-function disc is determined to be a multi-burning digital multi-function which has already recorded data. CD.

12. The method for determining the type of a digital multi-function optical disc according to claim 11, wherein the total intensity signal is a sum of at least one signal obtained by detecting the digital multi-function disc by an optical pickup. .