JP5217466B2 - Optical disc discrimination method, optical disc apparatus and program - Google Patents

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 directly 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. It is a standard that assumes each usage mode, such as writing contents on a blank disc purchased by a DVD user at a store of a commercial company.

  In this DVD Download standard, copyrights such as prevention of illegal copying and illegal content reproduction are prevented in the DVD control data zone (the area where control information is recorded, which is almost synonymous with the lead-in zone described below). There is a standard (EST2 standard) in which control signals for protection are recorded in advance.

That is, the following four pieces of information are recorded 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 logically reads the optical disc based on the description of Book Type. Is recognized as a DVD-ROM. Therefore, the data zone is next sought, and the recorded data reading process is started.

  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 apparatus 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 possibility that a malfunction may occur as a failure occurs 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 a type of an optical disc loaded, and after detecting that the disc is a DVD-ROM from disc information described in the lead-in zone of the optical disc, tracking in a data zone of the optical disc is performed. judged to be tracking on Call by performing an operation command, when the tracking error signal from the data start address area definitive data zone by performing the focus-on is determined not to be detected, an optical disk and a blank disc that conforms to the DVD Download standards determined In addition, the optical disk reading operation is stopped.

  The tracking operation can be performed while moving in the radial direction of the optical disc.

Another aspect of the present invention is an optical disc apparatus for recording and / or reproducing information of a loaded optical disc, wherein the discriminating information is a DVD-ROM based on disc information described in a lead-in zone of the optical disc. A tracking control unit that performs tracking-on control in the data zone of the optical disk and determines that tracking-on is not possible. a second identifying means for determining whether the tracking error signal subjected to focus on the data start address area of definitive data zone, if it is identified as being logically DVD-ROM by the first identification means, said tracking control Second identification means based on the output of the means Together when the tracking error signal is determined not to determine the optical disk to be a blank disc conforms to the DVD Download standards, it is characterized in that a discriminating means for stopping the reading operation of the optical disk.

  The tracking control means can perform tracking-on control while moving in the radial direction 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 tracking control unit, a second identification unit, and a determination unit of the optical disc apparatus.

  According to the present invention, it is possible to easily determine that the DVD download standard Bunrank disc and to 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. It has functions for detecting / outputting Book Type information, detecting / outputting other control signals, and detecting / outputting tracking error signals. This signal processing / servo control unit 4 has functions of an RF front end and digital signal processing, a focus servo driving unit that is an actuator of the optical pickup 3, and a servo control unit that gives a servo control signal to the tracking servo driving unit. It has.

  The signal processing / servo control unit 4 identifies the disk information recorded in the lead-in zone, instructs the optical pickup to perform a tracking operation, and outputs a tracking-on disabled output when tracking fails. It corresponds to the first identification means, the tracking control means, and the second identification means in that an output that cannot be turned on is obtained and focus is turned on in the data zone to detect the presence or absence of a tracking error signal.

  The disc discriminating unit 5 receives the disc information detection signal, the tracking-on disabled signal and the TE (tracking error) detection signal output from the signal processing / servo control unit 4, and discriminates what type of DVD 1 is. And determining means for outputting the determination. 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 DVD 1 and that the DVD 1 is a DVD Download standard DVD and is a blank disc in which no data is 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 determines 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, when it is detected that the Book Type is a DVD-ROM, the DVD 1 is logically determined to be a DVD-ROM, so the signal processing / servo control unit 4 moves the optical pickup 3 to the data zone, A tracking operation command is issued (step S3). This tracking operation is performed while the optical pickup 3 seeks in the radial direction of the optical disc 1. The signal processing / servo control unit 4 determines whether tracking is possible based on the tracking operation command (step S4). When tracking-on is impossible (tracking failure), the signal processing / servo control unit 4 outputs a message to that effect to the disk discrimination unit 5. The signal processing / servo control unit 4 performs focus on a predetermined area of the data zone and reads data from the data zone (step S5). For example, if the predetermined area is 30000h which is the start address of the data zone, or if it is the outermost track, the focus on addressing is fixed, and the tracking error signal detection control can be simplified. is there.

  The signal processing / servo control unit 4 detects a tracking error signal from a predetermined address by a phase difference method (DPD type differencial phase detection), and determines the presence or absence of the tracking error signal (step S6). As a result of this determination, when a tracking error signal exceeding a predetermined amplitude (level) is not detected, the signal processing / servo control unit 4 outputs an output without a tracking error signal to the disk determination unit 5.

  The disc discriminating unit 5 is loaded when it is detected that the Book Type is DVD-ROM in the lead-in zone, the tracking fails, the focus is on a predetermined area of the data zone, and no tracking error signal is detected. It is determined that the DVD 1 that has been read is a blank disk of the DVD Download standard (step S7). The optical disc apparatus stops the reproduction operation or performs processing such as ejection by determining that the DVD 1 is a blank disc (step S8). If a tracking error signal is detected in step S6, or if tracking is not turned off in step S4, data is recorded in the data zone, so it is determined that DVD1 is a DVD-ROM. Then (step S10), the process proceeds to the reproduction operation (step S11).

  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 the above-described embodiment, after disc information is detected from the lead-in zone, a tracking operation command (tracking on) is once performed, and when tracking on is impossible (tracking failure), focus on is performed on the data zone. Since the order of detecting the tracking error signal is taken, there is an advantage that it is possible to reliably detect that data is not recorded in the data zone.

  When disc information is detected from this lead-in zone, tracking to the data zone is not possible. Therefore, the data zone is focused on and a tracking error signal is detected, and the disc is a blank disc of the DVD Download standard. The invention for performing the determination can also be realized by installing a control program in the information processing apparatus. As a part of the disc discriminating software of the conventional DVD player, the discriminating function for disc disc information from the lead-in zone, the tracking control function for performing the tracking impossible output in response to the tracking operation command, and the tracking impossible output of the tracking control means A control program for realizing a tracking error signal identification function for detecting the presence or absence of a tracking error signal by focusing on a predetermined area of the data zone, and a discrimination function for discriminating that the disc is a DVD Download standard blank disc based on these outputs By installing, it is possible to determine that the disc is a blank disc of the DVD Download standard 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 apparatus via a 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, tracking control means)
5 Disc discriminator (disc discriminating means)

Claims (5)

In a method of discriminating an optical disc for discriminating the type of optical disc loaded,
After detecting that the disc is a DVD-ROM from the disc information described in the lead-in zone of the optical disc, a tracking operation command is issued in the data zone of the optical disc, and it is determined that tracking on is not possible. When it is determined that the tracking error signal is not detected by performing focus-on from the data start address area in the optical disc, the optical disc is determined to be a DVD Download standard blank disc, and the reading operation of the optical disc is stopped.
A method of discriminating an optical disc characterized by the above.   2. The optical disc identification method according to claim 1, wherein the tracking operation is performed while moving in a radial direction of the optical disc. An optical disc apparatus for recording and / or reproducing information of a loaded optical disc,
First identifying means for identifying a DVD-ROM by the disc information described in the lead-in zone of the optical disc;
Tracking control means for performing tracking-on control in the data zone of the optical disc, and determining that tracking-on is impossible;
The tracking-on not the output of the tracking control means, and a second identification means for determining the presence or absence of the tracking error signal subjected to focus on the data start address area of definitive data zone of the optical disc,
When the first discriminating means logically discriminates that it is a DVD-ROM, when it is judged that there is no tracking error signal of the second discriminating means based on the output from the tracking control means, the optical disc is taken as a DVD. An optical disc apparatus comprising: a discriminating unit that discriminates that the disc is a download standard blank disc and stops the reading operation of the optical disc. 4. The optical disk apparatus according to claim 3 , wherein the tracking control means performs tracking-on control while moving in the radial direction of the optical disk. 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 tracking control unit, a second identification unit, and a determination unit of the optical disc apparatus according to claim 3 or 4 .

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