KR100970590B1 - Apparatus and method of discrimating media kind of optical recording media - Google Patents

Abstract

Disclosed are an apparatus and method for determining an optical recording medium. The discriminating apparatus of the disclosed optical recording medium makes it possible to determine the recording method of the optical recording medium more quickly so that the recording / reproducing apparatus of the optical recording medium can enter the reproducing or recordable state faster.

Description

Apparatus and method of discrimating media kind of optical recording media

The present invention relates to an apparatus and method for determining a recording method of an optical recording medium.

Background Art Optical recording media are widely used as media for recording data such as audio, images, and graphics. As such an optical recording medium, various media such as CD (Compact Disc), DVD (Digital Versatile Disc) and BD (Blue-ray Disc) have been proposed.

Such an optical recording medium typically has a recording layer having a land / groove structure, and may be divided into a land recording method or a groove recording method depending on where recording is performed. In the case of a conventional optical recording medium, a groove recording method is used. However, as a medium such as low-to-high media has been proposed, the need for a land recording method has emerged.

As such different recording methods are mixed, the apparatus for recording / reproducing the optical recording medium is required to determine the recording method. A conventional recording / reproducing apparatus determines a land / groove recording method by reading a signal flag recorded in a predetermined area (e.g., Disc Information area) on an optical recording medium, and then grooves. Alternatively, the recording / reproduction is started by tracking the land, but this method has a problem in that it takes a long time to start recording / reproducing.

Accordingly, the present invention provides an apparatus and method for determining an optical recording medium capable of determining the recording method of the optical recording medium more quickly so that the recording / reproducing apparatus of the optical recording medium can enter the reproducing or recordable state faster. To provide.

An apparatus for determining an optical recording medium according to an aspect of the present invention includes: an optical pickup for irradiating light onto an optical recording medium; A control unit for setting a reproduction method corresponding to any one of the first recording method and the second recording method, and controlling the optical pickup to irradiate light to the optical recording medium in response to the set reproduction method; A signal processor for processing signals from the optical pickup and outputting a first signal and a second signal; An optical recording medium discriminating unit including a medium recording method discriminating unit for determining whether the first recording method and the second signal are output and determining which of the first and second recording methods the optical recording medium has; It includes.

The first recording method may be a groove recording method, and the second recording method may be a land recording method. Alternatively, the first recording method may be an in-pit recording method, and the second recording method may be an on-pit recording method.

The first signal may be a sum signal, and the second signal may be a difference signal. Alternatively, the first signal may be an RF signal, and the second signal may be a wobble signal.

The control unit controls the optical pickup so that the optical pickup tracks on the optical recording medium in accordance with the tracking polarity information corresponding to either of the first recording method and the second recording method. It features.

The medium recording method discriminator may be configured to determine whether the output first and second signals are at least one of phase locked, whether a sync signal is detected, and whether an error occurs in the RF signal. It is characterized by determining the presence or absence of each signal.

For example, the medium recording method determination unit may determine the presence or absence of the RF signal based on at least one of whether the phase of the RF signal is fixed, whether the frame sync signal is detected, or whether an error occurs. The medium recording method determination unit may determine whether the wobble signal is present or not based on at least one of whether the wobble signal is fixed in phase, whether the wobble sync signal is detected, or whether an error has occurred.

The control unit defaults to a reproducing method corresponding to one of the first recording method and the second recording method, and the first and second signals based on the reproducing method set as the default are set by the medium recording method discriminator. If it is determined that there is no, the default reproducing method is changed to a reproducing method corresponding to another of the first recording method and the second recording method, and the optical pickup is controlled in response to the changed reproducing method.

The medium recording method discriminator may repeatedly determine whether the first signal and the second signal are present based on the changed reproduction method.

The medium recording method determination unit stops the determination of the presence or absence of the first signal and the second signal when the number of repetitions of the determination of the presence or absence of the first signal and the second signal is equal to or greater than a preset number. And the quality of the second signal obtained by the reproduction method corresponding to the quality of the second signal obtained by the reproduction method corresponding to the second recording method to determine the recording method of the optical recording medium.

The optical recording medium discriminating unit may further include a medium type discriminating unit which determines the type of the optical recording medium.

The signal processing unit processes the signals obtained from the optical pickup to generate a focus error signal and a sum signal, and the medium type determination unit detects a time interval at which any one of the S-waveform and the sum signal of the focus error signal is generated. And the type of the optical recording medium is determined based on the detected time interval.

According to another aspect of the present invention, there is provided a method of determining an optical recording medium, comprising: a reproduction method setting step of setting a reproduction method corresponding to any one of a first recording method and a second recording method; A signal determination step of determining the presence or absence of the first signal and the second signal obtained based on the set reproduction method; And a recording method discrimination step of determining which of the first and second recording methods the optical recording medium is based on the presence or absence of the first signal and the second signal.

The first recording method may be a groove recording method, and the second recording method may be a land recording method. Alternatively, the first recording method may be an in-pit recording method, and the second recording method may be an on-pit recording method.

The first signal may be a sum signal, and the second signal may be a difference signal. Alternatively, the first signal may be an RF signal and the second signal may be a wobble signal.

The reproducing method setting step may include setting a reproducing method corresponding to any one of a first recording method and a second recording method as a default, and a first signal and a second signal based on the default reproducing method. And if it is determined that there is no information, changing the default playback method to a playback method corresponding to another one of the first recording method and the second recording method.

In the reproducing method setting step, the tracking polarity information corresponding to any one of the first recording method and the second recording method is set, and the optical pickup is tracked on so as to correspond to the set tracking polarity information.

The signal determining step may include determining whether each of the first and second signals is present based on at least one of whether a phase is fixed, whether a sync signal is detected, and whether an error occurs. It characterized in that it further comprises.

In the recording method determination step, when it is determined that there is at least one signal of the first signal and the second signal, the optical recording medium is characterized as determining that the recording method corresponds to the set reproduction method.

According to another aspect of the present invention, if it is determined that the first signal and the second signal are absent based on the set reproduction method, the method of determining the optical recording medium may be changed to one of the first recording method and the second recording method. The method may further include a repetition step of changing to a reproduction method corresponding to the scheme, and repeating a signal determination step of determining at least one of the first signal and the second signal.

At this time, when the number of repetitions of the repetition step is equal to or greater than a predetermined number of times, the repetition step is stopped, and the reproduction corresponding to the second recording method and the quality of the second signal obtained by the reproducing method corresponding to the first recording method are stopped. The quality of the second signal obtained by the method is compared to determine the recording method of the optical recording medium.

The method for discriminating an optical recording medium according to another aspect of the present invention may further include a medium type discrimination step of discriminating the type of the optical recording medium.

The medium type determining step includes determining the type of the optical recording medium on the basis of a time interval in which at least one of the surface layer of the optical recording medium obtained in the focus search process and the S-waveform and sum signal of the focus error signal in the recording layer is generated. It is characterized by determining.

A computer-readable recording medium according to another aspect of the present invention records a program for executing the above-described methods on a computer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the examples exemplified below are not intended to limit the scope of the present invention, but are provided to fully explain the present invention to those skilled in the art. In the drawings, like reference numerals refer to like elements, and the size of each element in the drawings may be exaggerated for clarity and convenience of description.

1 shows a schematic configuration diagram of an apparatus for determining an optical recording medium according to an embodiment of the present invention.

Referring to FIG. 1, the apparatus for determining an optical recording medium according to the present embodiment includes an optical pickup 120, a spindle motor 130, a sled motor 140, a servo driver 150, a signal processor 160, and a memory. 170, a control unit 180, and an optical recording medium discrimination unit 190 are provided. Such an optical recording medium discriminating apparatus can be an optical recording medium recording / reproducing apparatus itself capable of performing the discriminating mode of the optical recording medium.

The optical recording medium 110 usable in the apparatus of this embodiment is a medium which takes the first recording method or the second recording method according to the standard. Such first and second recording methods include groove recording methods and land recording methods. Alternatively, there are an in-pit method and an on-pit method as the first and second recording methods. For example, the optical recording medium 110 may be an optical disc such as a CD, a DVD, a BD, or the like. Regardless of the type, CDs, DVDs, and BDs each have a thickness of 1.2 mm, but the distances from the surface layer to the recording layer are different. Depending on the standard, a land recording method or a groove recording method may be used.

2 shows a recordable optical recording medium having a land / groove structure. Referring to FIG. 2, the optical recording medium 110 has a configuration in which a reflective layer 113 and a recording layer 115 are interposed between the transparent substrates 111 and 119, and the land 115a is provided in the recording layer 115. And a groove 115b. When the optical recording medium 110 follows the groove recording method, recording is performed while the center of the beam spot is formed in the groove 115b, and the land 115a serves to guide the beam spot. On the other hand, when the optical recording medium 110 follows the land recording method, recording is performed on the land 115a, and the groove 111b serves to guide. On the other hand, the wobble 115c is formed on the sidewall of the groove 115b to contain the sync signal of the track, address information, and the like.

The optical pickup 120 is normally tracked on, in the case of the optical recording medium 110 according to the groove recording method, the focus of the optical pickup 120 is set to the groove 115b or the land. In the case of the optical recording medium 110 that follows the recording method, this means that the focus of the optical pickup 120 is set to the land 115a. When the optical pickup 120 tracks normally, the sum signal, the difference signal, the radio frequency signal, or the wobble signal will be normally read.

On the other hand, when the optical pickup 120 is tracked incorrectly, that is, in the case of the optical recording medium 110 that follows the groove recording method, the focus of the optical pickup 120 is set to the land 115a. Or in the case of the optical recording medium 110 according to the land recording method, when the focus of the optical pickup 120 is set to the groove 115b, the sum signal, the difference signal, the RF signal and the wobble signal are missing or incorrectly recorded. Will appear.

In FIG. 2, a land / groove structure of the recordable optical recording medium 110 is illustrated, but is not limited thereto. In the case of a reproduction-only optical recording medium, the in-pit method and the on-pit method may correspond to the groove recording method and the land recording method, respectively, and the optical recording medium discriminating apparatus and method of this embodiment may be applied as it is.

Referring back to FIG. 1, the optical pickup 120 projects the optical signal onto the optical recording medium 110 and detects the optical signal reflected from the disk 110. For example, the light source of the optical pickup 120 may include a CD light source for generating an infrared beam, a DVD light source for generating a red laser beam and a BD light source for generating a blue laser beam. One light source can be selected according to the determination result of the same optical recording medium type. Prior to the determination of the optical recording medium, a specific light source may be selected as a default value. As an example, a light source for a DVD may be set as a default value.

The spindle motor 130 rotates the optical recording medium 110, and the sled motor 140 moves the optical pickup 120 on the optical recording medium 110.

The servo driver 150 generates driving signals for driving the spindle motor 130 and the sled motor 140 based on various control signals input from the controller 180. In addition, the servo driver 150 generates a drive signal for driving an actuator (not shown) of the optical pickup 120 for focus control and tracking control.

The signal processor 160 processes the signals output from an optical detector (not shown) in the optical pickup 120 to combine the sum signal and the difference signal, and the RF signal, the wobble signal, the focus error signal, and the tracking signal. Generates a tracking error signal and the like. The signal processor 160 also performs a series of signal processing for processing the RF signal to restore the original data before recording. Here, the RF signal may be given as a sum signal obtained by adding up signals output from a plurality of regions of the photo detector, and a wobble signal. The focus error signal, the tracking error, and the like may be given as a difference signal of signals output from a plurality of regions of the photo detector.

The controller 180 collectively controls the components of the optical recording medium recording / reproducing apparatus. When the discriminant mode of the optical recording medium starts, the controller 180 controls the objective lens (not shown) of the optical pickup 120 to the surface of the optical recording medium 110. Generate an actuator drive control signal for moving in the vertical direction of the optical signal, generate a focus control signal for executing the focus search process, further follow the optical pickup 120 to the track of the optical recording medium 110, A wobble signal, a focus error signal, a tracking error signal, and the like are generated, and a series of optical recording medium discrimination control processes are executed. The controller 180 includes hardware and software for executing the flowcharts of FIGS. 3 to 5. Control operations for determining the optical recording medium in the controller 180 will be described in detail with reference to FIGS. 3 to 5.

The memory 190 stores program and parameter information necessary for controlling the optical recording medium recording / reproducing apparatus, as well as information necessary for discriminating the optical recording medium.

The optical recording medium discriminating unit 170 is composed of a medium type determining unit 171 and a medium recording method determining unit 172 in detail. The optical recording medium discrimination unit 170 is enabled only in the optical recording medium discrimination mode and is disabled in other modes. As an example, the optical recording medium discrimination mode can be executed when the optical recording medium is loaded into the optical recording medium recording / reproducing apparatus and when the optical recording medium recording / reproducing apparatus is turned on with the optical recording medium loaded.

The medium type determining unit 171 determines the type of optical recording medium such as CD, DVD or BD. For example, the medium type determination unit 171 detects an S-waveform and / or a sum signal in a focus search process performed immediately after the optical pickup 120 is loaded onto the optical recording medium 110, and detects the detected S-waveform. And / or the optical recording medium type can be determined based on the time interval of occurrence of the sum signal.

For example, in the case of a CD, the distance from the surface to which the light is incident is 1.2 mm, in the case of a DVD, the distance from the surface to the recording layer is 0.6 mm, and in the case of a BD, the distance from the surface to the recording layer is 0.1mm. Thus, CD, DVD, and BD in the time interval between the S-waveform and / or sum signal generated in the optical recording medium surface layer and the S-waveform and / or sum signal generated in the recording layer closest to the optical recording medium surface layer. There is not much difference. Accordingly, the medium type discriminating unit 171 of the present embodiment determines which type of optical recording medium among CD, DVD, and BD corresponds to the loaded optical recording medium based on the time interval of the S-waveform and / or the sum signal. Can be determined.

More specifically, the controller 180 generates a control signal for enabling the media type determination unit 171 when the focus search mode is started, and also controls the objective lens of the optical pickup 120 on the surface of the optical recording medium 110. The actuator driving control signal for moving in the vertical direction is generated, and when the media type determination unit 171 is enabled, the S-waveform and / or sum signal is detected by detecting a point where the sign of the input focus error signal is changed. Detect the generated position and measure the time interval between the S-waveform and / or sum signal generated in the surface layer of the optical recording medium and the S-waveform and / or sum signal generated in the recording layer closest to the surface layer of the optical recording medium. . As an example, the clock signal may be counted from the time point at which the first S-waveform and / or sum signal is generated to the time point at which the next S-waveform and / or sum signal is generated. Next, the medium type discrimination unit 171 performs time intervals between the measured S-waveforms and / or the sum signal and standard time intervals of the S-waveforms and / or the sum signal for each type of optical recording medium read from the memory 190. The information is compared to determine the optical recording medium type. That is, the optical recording medium type having the time interval between the measured S-waveform and / or the sum signal and the closest standard time interval information is determined as the loaded optical recording medium type, and the type discrimination informing the determined optical recording medium type is indicated. The signal is output to the controller 180.

The controller 180 selects various parameters used for the light source and the signal processing of the optical pickup 120 to be suitable for the optical recording medium type corresponding to the input type determination signal.

The medium recording method determination unit 172 determines whether the recording method of the optical recording medium 110 is a land recording method or a groove recording method.

The media recording method discrimination unit 172 of this embodiment determines the recording method by determining the presence of the RF signal and the wobble signal.

The presence or absence of the RF signal may be determined from the quality of the RF signal. For example, the presence or absence of the RF signal may be determined by determining the quality of the RF signal based on at least one of whether the signal phase is fixed, whether the frame sync signal of the RF signal is detected, and whether an error occurs in the RF signal.

As an example of the determination of the presence or absence of the RF signal, the presence or absence of the RF signal may be determined based on whether or not the phase of the RF signal path generated by the signal processor 160 is fixed. That is, the quality of the RF signal may be determined from the RF phase locked loop (PLL). For example, if the RF PLL of the generated RF signal can be fixed, it is determined that there is an RF signal, and if the RF PLL is not fixed, the RF signal can no longer be processed, and thus it can be determined that there is no RF signal.

According to another example, the presence or absence of the RF signal may be determined in various stages. For example, even if the RF PLL is fixed, there may be substantially no RF signal. For example, even if the optical pickup 120 tracks correctly on the optical recording medium 110, there will be no RF signal if no data is recorded on the optical recording medium 110 itself. In this case, the presence or absence of the RF signal can be determined by properly detecting the frame sync signal obtained from the RF signal.

Furthermore, the presence or absence of an RF signal may be determined based on a decoding error rate of the input RF signal. For example, when the bER (block error rate) of the input RF signal is compared with the allowable bER of the RF signal read out from the memory 190, and when the bER of the input RF signal becomes more than the allowable bER, the data is read from the RF signal. Since it cannot be input, it can be determined that the RF signal is substantially absent. As described above, the determination of the presence or absence of the RF signal may be made in various ways, and the determination criteria may be set differently depending on which level the quality of the RF signal, which is the determination criteria, is placed.

On the other hand, the presence or absence of the wobble signal can be determined from the quality of the wobble signal. For example, the presence or absence of the wobble signal may be determined from the quality of the wobble signal based on at least one of whether the wobble signal is fixed in phase, whether the wobble signal detects the wobble sync signal, and whether the wobble signal has an error.

For example, the presence or absence of the wobble signal may be determined based on whether the wobble signal generated by the signal processor 160 is fixed in phase. That is, the quality of the wobble signal can be determined from the wobble PLL. For example, if the wobble PLL for the wobble signal can be fixed, it can be determined that there is a wobble signal, and if the wobble PLL is not fixed, it can be determined that there is no wobble signal.

According to another example, the presence or absence of the wobble signal may be determined in various stages. For example, even if the wobble PLL is fixed, there may be substantially no wobble signal. In this case, the number of wobble sync signals obtained from the wobble signals for a predetermined period is compared with the minimum number S of wobble sync signals read from the memory 190, and the number of wobble sync signals obtained from the wobble signals is the minimum number (S). ), It can be determined that there is a wobble signal. In addition, when an address is detected, it is possible to determine that a reliable address is detected and determine that there is a wobble signal. For example, it is possible to confirm that a reliable scan is not detected by checking the error correction code of the detected address or by checking whether the detected address is detected as a continuous value. Further, by comparing the decoding error rate of the wobble signal and the allowable error rate R read from the memory 190, if the decoding error rate of the wobble signal is larger than the allowable error rate R, it can be determined that there is no wobble signal. The determination of the presence or absence of such a wobble signal may vary depending on the level at which the quality of the wobble signal to be discriminated is placed, and the level of the wobble signal quality depends on the required accuracy and time required for discriminating the optical recording medium. It can be set differently.

The presence of the RF signal means that the optical pickup 120 has tracked normally. On the other hand, the absence of the RF signal means that the optical pickup 120 is tracked incorrectly so that the RF signal is not read or the optical pickup ( Even if 120 is normally tracked on, data may not be recorded on the optical recording medium 110. As described above, when there is no RF signal, it is possible to determine whether or not the optical pickup 120 tracks normally based on the presence or absence of the wobble signal. That is, the presence of a wobble signal means that the optical pickup 120 tracks normally even without the RF signal, and the absence of a wobble signal means that the optical pickup 120 has tracked incorrectly. . By determining the presence or absence of the RF signal and the wobble signal in this way, it is possible to know whether the optical pickup 120 is correctly tracked on, and according to which of the groove recording method and the land recording method are reproduced by the optical pickup 120 at this time? The recording method of the optical recording medium 110 can be determined accordingly.

Next, with reference to Figs. 3 to 5, an optical recording medium discrimination method according to an embodiment of the present invention will be described in time series. FIG. 3 is a flowchart showing the overall optical recording medium discrimination process of this embodiment, FIG. 4 is a flowchart showing only the recording method discrimination process of the optical recording medium, and FIG. 5 is a flowchart showing the quality evaluation process of the wobble signal.

Referring to FIG. 3, first, it is determined whether the optical recording medium recording / reproducing apparatus is switched to the optical recording medium discrimination mode (S100). For example, when the optical recording medium is loaded into the optical recording medium recording / reproducing apparatus or the optical recording medium is loaded, the power of the optical recording medium recording / reproducing apparatus is changed from the OFF state to the ON state. It happens when

If the optical recording medium discrimination mode is changed, the optical recording medium recording / reproducing apparatus executes a process of determining the type of the optical recording medium (S200). This process can be done, for example, in a focus search mode. For example, by detecting the point where the sign of the focus error signal generated in the focus search mode is changed, the position where the S-waveform is generated is detected, and the S-waveform generated from the surface layer of the optical recording medium and the surface layer of the optical recording medium. By measuring the time interval between the S-waveform and the sum signal generated in the nearest recording layer, the time interval between the measured S-waveform and the sum signal is measured and the standard time interval information of the S-wave and the sum signal for each type of optical recording medium. The optical recording medium type can be determined by comparing them.

Next, the recording method of the optical recording medium is determined (S300). The process of determining the recording method of such an optical recording medium may be performed immediately before the focus search and before the step of recording or reproducing the data. The recording method determination process of the optical recording medium will be described in more detail with reference to FIG. 4.

Referring to FIG. 4, a recording method determination process of an optical recording medium according to an embodiment of the present invention may include a polarity of a tracking error (TE) signal (hereinafter, referred to as tracking error polarity) before determining a recording method of the optical recording medium. The first polarity is set to a default value of S310. The first polarity may be, for example, a tracking error polarity obtained when the groove writing method is taken.

Next, the actuator is controlled to put the optical pickup in the track on state (S320). For example, when the first polarity is set to the tracking error polarity in the groove recording manner, the optical pickup is controlled to be positioned on the groove.

Next, it is determined whether or not the RF signal (S330). If there is an RF signal, the recording method of the optical recording medium is determined in such a manner as to be a reference of the track on state (S380). For example, when the first polarity is set to the tracking error polarity in the groove recording method, when the RF signal is normally read from the groove, the optical recording medium is determined as the groove recording method. The determination of the presence or absence of the RF signal may be determined, for example, from an RF phase locked loop (PLL) obtained from the RF signal, a frame sync signal, or a decoding error rate as described above. If it is determined that there is no RF signal, it is then determined whether the wobble signal exists (S340).

Referring to FIG. 5, the presence or absence of a wobble signal can be determined based on the RF PLL, the frame sync signal, or the decoding error rate obtained from the RF signal as described above. First, it is determined whether the wobble PLL of the wobble signal is fixed (S341). If the wobble PLL cannot be fixed, signal processing can no longer proceed, and it can be determined that there is no wobble signal.

Even if the wobble PLL is fixed, the wobble signal may not be read normally. Accordingly, the presence of the wobble signal may be determined by detecting the wobble sync signal from the wobble signal (S343). For example, when the number of wobble sync signals obtained from the wobble signals for a predetermined period is compared with the minimum number S of the preset wobble sync signals, and the number of wobble sync signals obtained from the wobble signals is equal to or greater than the preset minimum number S, It may be determined that there is a wobble signal. If the number of detected wobble sync signals is smaller than the predetermined minimum number S during a predetermined period, since address information cannot be obtained from the wobble signal, it can be determined that there is no wobble signal.

Further, even when the wobble sync signal is normally read from the wobble signal, it is possible to determine whether the wobble signal exists from the decoding error rate of the wobble signal (S345). If the decoding error rate of the wobble signal is larger than the predetermined error rate R, information cannot be read from the wobble signal, and it can be determined that there is no wobble signal.

The above-described steps S341, S343, and S345 are not limited thereto as an example. Further, the wobble signal may be determined only in step S341, and the wobble signal may be determined in steps S341 and S343. The method of determining the wobble signal may be optional, and may be determined by the manufacturer or the user's choice.

Referring back to FIG. 4, when it is determined that there is a wobble signal (S340), that is, when the wobble signal is normally read from the groove, the optical recording medium determines the groove recording method (S380).

If there is a wobble signal, the recording method of the optical recording medium is determined in such a manner as a reference of the track-on state (S380). For example, when the first polarity is set to the tracking error polarity in the groove recording method, when the wobble signal is normally read in the groove, the optical recording medium is determined as the groove recording method.

If it is determined that there is no wobble signal (S340), it is determined whether to retry (S350). Whether or not to retry may be determined by comparing the number of attempts performed in steps S330 and S340 with a preset limit number N. If the number of attempts performed in steps S330 and S340 is less than the preset limit number N, the polarity of the tracking error (TE) signal is reversed (S360), and steps S320 to S340 are repeated. In this way, when the polarity of the tracking error (TE) signal is reversed, the reference position of the track on state is changed between the groove and the land. For example, if the optical pickup was in the groove side in the previous step S320 to S340, the optical pickup is placed on the land side in the step S320 to S340 which is retried (S320). Next, steps S330 to S340 are repeated to determine whether the RF signal is present and whether the wobble signal is present. If it is determined that there is an RF signal in step S330 that is retried or that there is a wobble signal in step S340 that is retried, the recording method is determined based on the groove or land that is the track on reference in steps S320 to S340 that are retried. (S380).

If it is determined in step S330 to step S340 that there is no RF signal or wobble signal, it is determined whether to repeat the retry (S350). If the number of attempts performed in steps S330 and S340 is smaller than the preset limit number N, the polarity of the tracking error (TE) signal is inverted again (S360), and steps S320 to S340 are repeated. As described above, by repeating steps S320 to S340 a predetermined number of times, an error that may occur when the presence of the RF signal or the wobble signal is determined can be suppressed.

If the number of attempts of steps S330 and S340 currently performed in step S350 is equal to the preset limit number N, the repetition is no longer performed and the first wobble signal at the first polarity and the second inverted at the first polarity are performed. The quality of the second wobble signal in polarity is compared to determine the recording method of the optical recording medium based on the polarity corresponding to the better wobble signal. That is, the recording method of the optical recording medium is determined by comparing the groove wobble signal obtained when the polarity in the groove recording method is taken with the land wobble signal obtained when the polarity in the land recording method is taken. For example, if the groove wobble signal is better than the land wobble signal, the optical recording medium can be determined to be a medium having a groove recording method.

In the case of this embodiment, when it is determined in step S330 that there is an RF signal, a case in which the process goes directly to the determination step of the optical recording medium is described, but the present invention is not limited thereto. Since the criterion for the determination of the presence or absence of the RF signal is determined by the manufacturer or the user's choice, it can be determined that the RF signal exists even if there is no RF signal or is incorrectly read. In preparation for such a case, even if it is determined that there is an RF signal in step S330, in order to secure the reliability of the determination, step S340 may be performed to determine the presence or absence of a wobble signal. Even when it is determined that there is an RF signal, if the presence or absence of the wobble signal is determined, in S380, the recording method of the optical recording medium is determined based on both the presence or absence of the RF signal and the presence or absence of the wobble signal.

Although the above-described embodiment has been described with reference to the recordable optical recording medium, the in-pit recording method and the on-pit recording method, which are recording methods of the read-only optical recording medium, can be discriminated through the substantially same recording method discrimination process. will be. However, in the case of the optical recording medium for regeneration, since there is no wobble formed on the groove sidewall, there is only an RF signal and no wobble signal. Therefore, if the in-pit recording method and the on-pit recording method are to be distinguished from the groove recording method and the land recording method, it is necessary to determine the recording method of the optical recording medium based on both the presence of the RF signal and the presence of the wobble signal. have.

For example, referring to FIG. 4, even if it is determined in step S330 that there is an RF signal, a step of determining whether or not there is a wobble signal after step S340 is performed to determine whether both the RF signal and the wobble signal are present. The tracking error polarity has the same polarity for the in-pit recording method and the groove recording method, and the same polarity for the on-pit recording method or the land recording method. Therefore, when the first polarity is set to the tracking error polarity of the in-pit recording method and tracked on to detect the RF signal and the wobble signal, it is determined that both the RF signal and the wobble signal are present, and thus the target optical recording medium. If it is determined that the groove recording method is a recordable optical recording medium, and if there is an RF signal and there is no wobble signal, it can be determined that the target optical recording medium is a reproduction-only optical recording medium of the in-pit recording method. If it is determined that neither the RF signal nor the wobble signal is found, the tracking error polarity is inverted and then tracked on again to detect the RF signal and the wobble signal. If it is determined that both the detected RF signal and the wobble signal are present, the target optical recording medium is determined to be a land-type recordable optical recording medium. If it is determined that there is an RF signal and there is no wobble signal, the target optical recording medium is It may be determined that the read-only optical recording medium of the on-pit recording method.

Further, the above-described embodiment discriminates the optical recording medium through the process of determining the type of the optical recording medium and the process of determining the recording method of the optical recording medium. However, the optical recording medium discrimination process of the present invention may include only the process of discriminating the recording method of the optical recording medium. For example, when the optical recording medium recording / reproducing apparatus is dedicated to recording / reproducing only a predetermined type of optical recording medium such as BD, etc., since the type of optical recording medium is already known, without the optical recording medium type determination process, Only the recording method determination process of the optical recording medium may be performed.

As in the above-described embodiment, the process of determining the optical recording medium may be performed by using signals read immediately after the focus search, and thus the process of separately reading information on the recording method in the optical recording medium may be omitted. It is possible to reach a state where data can be recorded or played back at a faster rate.

The invention can be practiced as a method, apparatus, system, or the like. When implemented in software, the constituent means of the present invention are code segments that necessarily perform the necessary work. The program or code segments may be stored in a processor readable medium or transmitted by a computer data signal coupled with a carrier on a transmission medium or network. Processor readable media includes any medium that can store or transmit information. Examples of processor-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memory, erasable ROM (EROM), floppy disks, optical disks, hard disks, optical fiber media, radio frequency (RF) networks, Etc. Computer data signals include any signal that can propagate over transmission media such as electronic network channels, optical fibers, air, electromagnetic fields, RF networks, and the like.

Such an apparatus and method for determining an optical recording medium of the present invention has been described with reference to the embodiment shown in the drawings for clarity, but it is merely an example, and those skilled in the art can various modifications and equivalents therefrom. It will be appreciated that other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

1 is a schematic structural diagram of an apparatus for determining an optical recording medium according to an embodiment of the present invention.

2 shows an optical recording medium having a land / groove structure.

3 is a flowchart showing a method of determining an optical recording medium according to an embodiment of the present invention.

FIG. 4 is a flowchart showing a recording method determination process of the optical recording medium in FIG.

FIG. 5 is a flowchart illustrating a quality estimation process of a wobble signal in FIG. 4.

<Description of the symbols for the main parts of the drawings>

110 Optical recording medium 120 Optical pickup

150 Servo driver 160 Signal processor

170 ... disc discrimination unit 180 ... control unit

190 ... Memory

Claims (26)

An optical pickup for irradiating light onto the optical recording medium; A control unit for setting a reproduction method corresponding to any one of the first recording method and the second recording method, and controlling the optical pickup to irradiate light to the optical recording medium in response to the set reproduction method; A signal processor for outputting a first signal and a second signal obtained by processing signals from the optical pickup in different ways; An optical recording medium discriminating unit including a medium recording method discriminating unit for determining whether the first recording method and the second signal are output and determining which of the first and second recording methods the optical recording medium has; Including; The optical recording medium discriminating unit further includes a medium type discriminating unit which determines the type of the optical recording medium, The signal processor generates a focus error signal and a sum signal by processing signals obtained from the optical pickup, The medium type determining unit detects a time interval at which any one of an S-waveform and a sum signal of a focus error signal is generated, and determines the type of the optical recording medium based on the detected time interval. Media determination device. According to claim 1, And the first recording method is a groove recording method, and the second recording method is a land recording method. According to claim 1, And the first recording method is an in-pit recording method, and the second recording method is an on-pit recording method. According to claim 1, And said first signal is a sum signal and said second signal is a difference signal. According to claim 1, And the first signal is an RF signal, and the second signal is a wobble signal. According to claim 1, The control unit, And the optical pickup is controlled such that the optical pickup is tracked on the optical recording medium in accordance with the tracking polarity information corresponding to either of the first recording method and the second recording method. According to claim 1, The medium recording method determination unit, And determining whether each of the first and second signals is present based on at least one of whether the output first and second signals are locked in phase, whether or not a sync signal is detected, and whether an error occurs. Recording medium determination device. According to claim 1, The control unit, If a reproduction method corresponding to either of the first recording method and the second recording method is set as a default, and the medium recording method determination unit determines that there is no first signal and the second signal based on the playback method set as the default, And changing the default reproducing method into a reproducing method corresponding to another one of the first recording method and the second recording method, and controlling the optical pickup in response to the changed reproducing method. . The method of claim 8, And the medium recording method discrimination unit repeatedly determines whether a first signal and a second signal are present based on the changed reproduction method. The method of claim 9, The medium recording method determination unit, When the number of repetitions of the determination of the presence or absence of the first signal and the second signal is equal to or greater than a predetermined number of times, the determination of the presence or absence of the first signal and the second signal is stopped, and the result is obtained by a reproduction method corresponding to the first recording method. And recording quality of the optical recording medium by comparing the quality of the second signal with the quality of the second signal obtained by the reproduction method corresponding to the second recording method. delete delete A reproduction method setting step of setting a reproduction method corresponding to any one of the first recording method and the second recording method; A signal determination step of determining the presence or absence of the first signal and the second signal obtained by processing in different ways based on the set reproduction method; A recording method discrimination step of determining which of the first and second recording methods the optical recording medium is based on the presence or absence of the first signal and the second signal; And And a media type determination step of determining the type of the optical recording medium. The medium type determination step, And determining the type of the optical recording medium based on a time interval at which any one of the S-waveform and the sum signal of the focus error signal in the recording layer and the surface layer of the optical recording medium obtained in the focus search process is generated. How to determine the recording medium. The method of claim 13, Wherein the first recording method is a groove recording method, and the second recording method is a land recording method. The method of claim 13, And the first recording method is an in-pit recording method, and the second recording method is an on-pit recording method. The method of claim 13, And said first signal is a sum signal and said second signal is a difference signal. The method of claim 13, And the first signal is an RF signal, and the second signal is a wobble signal. The method of claim 13, The playing method setting step, Setting a reproduction method corresponding to any one of the first recording method and the second recording method as a default; If it is determined that there is no first signal and second signal based on the default reproducing method, changing the default reproducing method to a reproducing method corresponding to another of the first recording method and the second recording method; An optical recording medium discrimination method comprising: The method of claim 13, The playing method setting step, Setting tracking polarity information corresponding to either of the first recording method and the second recording method; And optically picking up the optical pickup so as to correspond to the set tracking polarity information. The method of claim 13, The signal determination step, Determining whether each of the first signal and the second signal is present based on at least one of whether a phase is fixed, whether a sync signal is detected, and whether an error occurs. An optical recording medium determination method. The method of claim 13, The recording method determination step, And if it is determined that there is at least one of the first signal and the second signal, the optical recording medium determines that it follows the recording method corresponding to the set reproduction method. The method of claim 13, If it is determined that the first signal and the second signal do not exist based on the set reproduction method, the set reproduction method is changed to a reproduction method corresponding to another one of the first recording method and the second recording method, and the first signal or And repeating the signal determining step of determining at least one of the second signals. 23. The method of claim 22, If the number of repetitions of the repetition step is equal to or greater than a predetermined number of times, the repetition step is stopped, and the reproducing method corresponding to the second recording method and the quality of the second signal obtained by the reproducing method corresponding to the first recording method are stopped. And a recording method of the optical recording medium is determined by comparing the quality of the obtained second signal. delete delete A computer-readable recording medium having recorded thereon a program for executing the method according to any one of claims 13 to 23 on a computer.

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