JP2009181653A - Optical disk determining method, optical disk device and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily determine a blank disk conforming to a DVD Download standard. <P>SOLUTION: The optical disk device is provided with a first identifying means 4 for identifying disk information written in the lead-in zone of an optical disk 1, second identifying means 4 for identifying that data is not recorded in a data zone of the optical disk 1, and a determining means 5 for determining that the optical disk is a blank disk conforming to the DVD Download standard from an output from the first identifying means and an output from the second identifying means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a discriminating method for an optical disc, an optical disc apparatus and a program for realizing the discriminating method.

There are various standards for a DVD (Digital Versatile Disc) which is one form of an optical disk, and new standards are set according to changes in usage forms. For this reason, it is necessary to determine the type of the loaded DVD when the DVD is loaded in the optical disc apparatus. As a technique for determining the type of the DVD, proposals disclosed in the following patent documents are known. ing.
JP 2004-246990 A JP 2000-315355 A

  Incidentally, the DVD Download standard has been proposed as a new DVD standard. In this DVD Download standard, the content supplier does not supply the DVD to the consumer, but the service provider authorized by the content supplier records the content on the DVD and provides the consumer with the DVD, or is authorized. This is a standard that assumes each usage mode, such as writing content to a DVD blank disc purchased by a user at the store of a vendor.

  The DVD Download standard protects copyrights by preventing illegal copying and illegal content playback in the DVD control data zone (which is almost synonymous with the control information zone where the control information is recorded). There is a standard (EST2 standard) in which a control signal for recording is recorded in advance.

That is, the following four pieces of information are made in the control data zone.
1) Book Type
2) Compatible part version 3) Disc indicator 4) Maximum recorded address

  Here, if DVD-ROM is described in the Book Type of the control data zone, it is logically recognized as a DVD-ROM, and it is recognized that data is recorded in the data zone. Is done.

  For this reason, if a blank disc in which no data is recorded in the data zone is loaded in the optical disc playback device, the optical disc playback device reads the control data zone and reads the blank disc on the basis of the description of Book Type. Logically, it is recognized as a DVD-ROM. Therefore, the optical disk playback device next seeks the data zone and moves to a process for reading recorded data.

  However, since no data is recorded in the data zone of the blank disc, data cannot be read even if the data zone is read. For this reason, the optical disk reproducing device may fall into an infinite loop operation that continues the data reading operation indefinitely. In addition, since there is no data to be read, there is a risk of malfunction such as misidentifying that a failure has occurred on the data processing apparatus side.

  An object of the present invention is to solve the above-described problem and to easily determine that the disc is a DVD Download standard blank disc in which no data is recorded in a data zone.

  The present invention relates to an optical disc discrimination method for discriminating the type of an optical disc loaded, wherein the disc information described in the lead-in zone of the optical disc detects logically a DVD-ROM, and the optical disc data zone When it is detected that no data is recorded, the optical disc is determined to be a blank disc of the DVD Download standard.

  When no tracking error signal with a predetermined amplitude or more is detected from the data zone, it can be determined that no data is recorded in the data zone.

  Further, when tracking on control is performed in the data zone and tracking on is disabled, it can be determined that no data is recorded in the data zone.

  Further, the logical detection of the DVD-ROM can be detected based on the Book Type described in the control data zone in the lead-in zone of the optical disc.

  According to another aspect of the present invention, in an optical disc apparatus that records and / or reproduces information on a loaded optical disc, the first identification for logically identifying the DVD-ROM based on the information described in the lead-in zone of the optical disc. Means, a second identification means for identifying that no data is recorded in the data zone of the optical disc, a logical DVD-ROM output by the first identification means, and data in the data zone by the second identification means Discriminating means for judging that the optical disc is a blank disc of the DVD Download standard when there is an output indicating that no is recorded.

  The second identification unit can determine that no data is recorded in the data zone when a tracking error signal having a predetermined amplitude or more cannot be detected.

  The second identification means performs tracking-on control in the data zone, and can determine that no data is recorded in the data zone when tracking-on is disabled.

  The logical identification of the DVD-ROM can be determined based on the Book Type described in the control data zone in the lead-in zone of the optical disc.

  Another aspect of the present invention is a program that, when installed in an information processing apparatus, causes the information processing apparatus to realize the functions of a first identification unit, a second identification unit, and a determination unit.

  According to the present invention, it is possible to easily determine that the disc is a DVD Download standard blank disc and prevent malfunction.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a part of the configuration of an optical disc apparatus. This optical disk apparatus is an example of a reproducing apparatus in which a loaded DVD 1 is rotated by a motor 2 and this is recorded on the DVD 1 by an optical pickup (indicated as P / U in FIG. 1) 3.

  The optical pickup 3 is connected to a signal processing / servo control unit 4 that processes the read signal and performs servo control of the optical pickup 3 based on the processed signal. The signal processing / servo control unit 4 processes a signal read by the optical pickup 3 and outputs a processing result thereof, and based on the read signal, the focus / tracking of the optical pickup 3 is performed. Servo control function to perform servo control. The signal processing function has the function of processing and outputting the signals read in the lead-in zone and data zone, detecting / outputting Book Type information, detecting / outputting other control signals, and detecting tracking error signals / Has a function to output. The signal processing / servo control unit 4 has an RF front end and digital signal processing function, a focus servo driving unit that is an actuator of the optical pickup 3, and a servo control function that gives a servo control signal to the tracking servo driving unit. Is.

  The signal processing / servo control unit 4 identifies the disc information described in the lead-in zone and identifies that no data is recorded in the data zone. Corresponds to the means.

  The disc discriminating unit 5 receives the disc information detection signal and the TE (tracking error) detection signal output from the signal processing / servo control unit 4, discriminates what kind of DVD 1 is, and outputs the discrimination output. It is means to do. If it is determined by this determination output that the loaded DVD 1 is a blank disk of the DVD Download standard, the reading operation of the DVD 1 is stopped and the playback stop operation or the process of ejecting the DVD 1 itself is performed. be able to.

  Next, a method for discriminating an optical disc will be described with reference to the flowchart of FIG.

  FIG. 2 is a flowchart showing a series of processes for determining that the loaded optical disc is the DVD 1 after determining that the loaded optical disc is a DVD 1 and that the disc is a blank disc with no data written in the data zone.

First, the optical disk apparatus seeks the optical pickup 3 to the lead-in zone where the control data inside the DVD 1 is recorded, and reads the lead-in zone (step S1). The signal processing / servo control unit 4 reads the Book Type described in the control data zone in the lead-in zone, and discriminates logical disk information (step S2). When disc information other than DVD-ROM is described in Book Type, it is described as DVD-R, DVD-RW, etc., and it is determined that the disc is such disc (step S7).

  On the other hand, if it is detected that the Book Type is a DVD-ROM, the DVD 1 is logically determined to be a DVD-ROM, so the optical disc apparatus moves the optical pickup 3 to the data zone, and the data in the data zone is read. Reading is performed (step S3). For example, since address 30000h is the start address of the data zone, data is read from this address 30000h. At this time, the signal processing / servo control unit 4 also detects the tracking error signal by the phase difference method (DPD differencial phase detection), and determines the presence or absence of the tracking error signal (step S4). If no tracking error signal exceeding a predetermined amplitude (level) is detected as a result of this determination, the signal processing / servo control unit 4 outputs an output indicating that there is no tracking error signal to the disk determination unit 5.

  The disc discriminating unit 5 detects that the Book Type is a DVD-ROM in the lead-in zone, and if no tracking error signal is detected in the data zone, the loaded DVD 1 is a blank disc of the DVD Download standard. Determine (step S5). The optical disk apparatus stops the reproduction operation or performs an ejection process or the like by determining that the disk is the blank disk (step S6).

  On the other hand, if a tracking error signal is detected as a result of the determination in step S4, since data is recorded in the data zone, it is determined that the DVD 1 is a DVD-ROM (step S8), and the process proceeds to the reproduction operation. (Step S9).

  When data is recorded in the data zone, the data contents are recorded as pits indicating “1” or “0” in each track. By detecting this pit, the normal tracking error signal has a predetermined width. Amplitude variation, for example, a sawtooth waveform having an output fluctuation width of several hundred milliV. However, when no data is recorded in the data zone, no pit is formed, so that only a minute level signal is detected as the tracking error signal. For this reason, when only a signal having a level where no pit is formed is detected as a tracking error signal in the blank disc, the signal processing / servo control unit 4 outputs that the tracking error signal is not detected.

  In addition, as a method for detecting the absence of data recording in the data zone, the signal processing / servo control unit 4 issues a tracking error signal detection instruction and determines whether the level does not reach a predetermined range. Instead of determining that there is no signal, it is also possible to determine that there is no data recording even when a tracking operation command (tracking on) is performed and tracking on is impossible (tracking OFF).

  Since it is logically determined to be a DVD-ROM from the record of the Book Type in the lead-in zone, tracking servo control and focus servo control are performed to perform data read control. However, since no data is recorded on the blank disc, a tracking error signal for performing tracking servo control cannot be obtained, only focus servo control is performed, and tracking is not turned on (tracking servo control is not turned on). Therefore, it can be determined that there is no data in the data zone. This determination has the advantage of being simple in that it can be determined by the tracking servo control behavior without comparing the amplitude level of the tracking error signal.

  In the above-described embodiment, the example in which the disc information is first detected from the lead-in zone and then the presence / absence of the tracking error signal in the data zone is described. However, before and after the detection operation is reversed. May be.

  Also, the invention for discriminating that the disc is a DVD Download standard blank disc based on the detection of disc information from the lead-in zone and the presence or absence of data recording in the data zone installs a control program in the information processing device. This can also be realized. As a part of the disc discriminating software of the conventional DVD player, disc discriminating function from the lead-in zone, discriminating presence / absence of data recording from the data zone, and a blank disc conforming to the DVD Download standard based on both discriminating results By installing a control program that realizes a discrimination function for discriminating the presence of a disc, it is possible to discriminate a DVD Download standard blank disc with a DVD player. Such a control program can be easily installed in the information processing apparatus by being recorded on a recording medium such as a CD-ROM. Further, the control program can be installed in the information processing apparatus via the network.

  Although the above embodiment has been described with reference to an example of a DVD playback apparatus, the present invention can be similarly applied to a DVD recording apparatus.

1 is a diagram showing a part of the configuration of an optical disc device according to an embodiment of the present invention. The flowchart which shows the processing operation of embodiment of this invention.

Explanation of symbols

1 DVD
2 Motor 3 Optical pickup 4 Signal processing / servo control unit (first identification means, second identification means)
5 Disc discriminator (disc discriminating means)

Claims (9)

In a method of discriminating an optical disc for discriminating the type of optical disc loaded,
When it is logically detected from the disc information described in the lead-in zone of the optical disc that the disc is a DVD-ROM and no data is recorded in the data zone of the optical disc, the optical disc is A method of discriminating an optical disc, wherein the disc is determined to be a blank disc of the DVD Download standard.   2. The method according to claim 1, wherein when no tracking error signal having a predetermined amplitude or more is detected from the data zone, no data is recorded in the data zone.   2. The method for discriminating an optical disk according to claim 1, wherein tracking-on control is performed in the data zone, and when tracking-on is disabled, it is determined that no data is recorded in the data zone. The detection of the logical DVD-ROM is as follows:
4. The method of discriminating an optical disc according to claim 1, wherein the detection is performed based on a book type described in a control data zone in a lead-in zone of the optical disc. In an optical disc apparatus for recording and / or reproducing information on a loaded optical disc,
First identification means for logically identifying a DVD-ROM from information described in the lead-in zone of the optical disc;
Second identifying means for identifying that no data is recorded in the data zone of the optical disc;
If there is an output from the first identification means that the data is logically a DVD-ROM and an output from the second identification means that no data is recorded in the data zone, the optical disk is blanked according to the DVD Download standard. An optical disc apparatus comprising: a discriminating means for judging that the disc is a disc.   6. The optical disc apparatus according to claim 5, wherein the second identification unit determines that no data is recorded in the data zone when a tracking error signal having a predetermined amplitude or more cannot be detected.   The said 2nd identification means performs control of tracking on in the said data zone, and when tracking on becomes impossible, it determines with the data not being recorded on the said data zone being characterized by the above-mentioned. Optical disk device. The logical identification of the DVD-ROM is
8. The optical disk apparatus according to claim 5, wherein the determination is made based on a book type described in a control data zone in a lead-in zone of the optical disk.   A program that causes the information processing apparatus to realize the functions of the first identification unit, the second identification unit, and the determination unit according to claim 5 by being installed in the information processing apparatus.

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