JP2004335102A - Optical disk player - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform angle switching of the video recorded by an interleave unit such as multi-angle prescribed in a video play-back format of a DVD or the like at high speed. <P>SOLUTION: This player is provided with a servo adjustment start means 7c prohibiting the start of the servo adjustment for a servo adjusting means 6 for a fixed time when a play-back system change receiving means 13 receives a play-back system change request. Seamless play-back is realized keeping always the optimum adjustment state by deciding the timing at which the servo adjustment start means 7c performs servo adjustment and deciding information quantity to be stored, also, a switching time of information can be shortened when a play-back system of video and sound is changed though an information storing means 3 functioning as a buffer is enlarged more than that required for the time necessary for adjustment. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disk device for optically recording and reproducing data, such as a compact disk (CD), a digital video disk (DVD), etc., and in particular, an information storage means mainly functioning as a data buffer the start timing of servo system adjustment. Optical disc reproducing apparatus that enables seamless reproduction while periodically correcting physical characteristic variations due to the position of the disk-type storage medium and characteristic deterioration caused by tilt of the disk by determining the adjustment timing according to the state of It is about. Further, the present invention relates to an optical disc reproducing apparatus in which a video recorded by an interleave unit such as a multi-angle specified in a video reproducing format such as a DVD is switched at a high speed.

2. Description of the Related Art Conventionally, a disk-type recording / reproducing apparatus with a servo adjustment function at the time of reading information has a driving device for rotating a disk-type storage medium, an optical pickup for optically reading information, and an information reading position detection for detecting an information reading position of the optical pickup. Means, and a focus offset adjusting means, so that the optimal reading can be performed at any position on the optical disk without being affected by the offset deviation due to the position of the disk, the aging, and the offset deviation due to the temperature change. Servo adjustment at the time of reading information is performed (for example, see Patent Document 1).
JP-A-11-007638

  However, in the conventional disk-type recording / reproducing apparatus with a servo adjustment function at the time of reading information, focus offset adjustment is performed regardless of the storage amount of information used for reproducing video and sound stored in the information storage means. In the case of focus offset adjustment in which the storage of information is interrupted, the first problem is that all the information in the information storage means is consumed and the video and sound are interrupted. Further, in an optical disk such as a DVD, in addition to the above-described focus offset adjustment, a tilt adjustment for correcting a tilt of the disk is required.

  FIG. 11 shows an example of a focus offset characteristic of an optical disc reproduced by a DVD video reproducing apparatus. In FIG. 11, the horizontal axis represents the distance in the radial direction of the disk, the vertical axis represents the distance from the focus point to the optimum reading point (that is, focus offset), (a) is the focus offset near the inner circumference, and (a) is The focus offset near the middle circumference and (C) show the focus offset near the outer circumference. As is apparent from this figure, the optical disk has different focus offset characteristics depending on the position of the disk in the radial direction, and it is necessary to always adjust the focus offset when reading the optical disk optimally.

  FIG. 12 shows an example of a radial tilt characteristic of an optical disc reproduced by a DVD video reproducing apparatus. In FIG. 12, the horizontal axis represents the radial distance of the disk, the vertical axis represents the radial tilt characteristics, (d) radial tilt near the inner circumference, (o) radial tilt near the middle circumference, and (f) outer circumference. The radial tilt in the vicinity is shown. As is apparent from this figure, the optical disk has different tilt characteristics depending on the position of the disk in the radial direction, and it is necessary to always perform tilt adjustment when reading the optical disk optimally.

  On the other hand, DVD video has a function called multi-angle playback that seamlessly switches images shot from a plurality of camera angles. This function plays back a disc in which a continuously recorded area of a predetermined data size is divided by the number of angles and recorded, and reads only the video information of the angle specified by the operator while repeatedly accessing. Play back. When a desired angle is changed by the operator during reproduction, the angle is switched by reading a data string of the corresponding angle.

  When performing such reproduction, when the information storage means is configured with a buffer size necessary for performing servo adjustment during reproduction, an angle switching request is received and stored in the information storage means as in the conventional case. When the data is changed, there is a second problem that the video of the new angle cannot be reproduced unless all the data already stored in the information storage means has been reproduced.

  FIG. 13 is a conceptual diagram showing a recording method and a reproducing method of a multi-angle video of a video disc reproduced by a DVD video reproducing apparatus. In the figure, (g) is a first recording area of an angle 1, (h) is a first recording area of an angle 2, (q) is a first recording area of an angle 3, and (ko) is a second recording area of an angle 1. , (S) is a second recording area of Angle 2, (S) is a second recording area of Angle 3, (S) is a third recording area of Angle 1, (C) is a third recording area of Angle 2, (S). (G) is a third recording area of the angle 3, (ta) is a fourth recording area of the angle 1, and (g) is a line indicating an access when the DVD video reproducing apparatus reproduces.

  When the DVD video playback apparatus performs section playback of a multi-angle video, for example, in the case of a video signal having three angles, the DVD video playback apparatus divides the data into predetermined data amounts and records the data in order on the disk. When such a disc is played back, every time the playback of one angle recording area is completed, the following is performed based on the angle number designated by the operator (in the case of the example, angle 2 is designated). Are accessed up to the recording position of the same angle and reproduced sequentially.

  FIGS. 14 and 15 show the data structure of the information storage means in the DVD-Video playback device when the DVD-Video playback device receives an angle change request from the operator. 14 and 15, (h) indicates the position where the current data is reproduced, and (tsu) indicates the position where the current data is stored. FIG. 14 shows a state in which the angle 2 is being reproduced, and FIG. 15 shows a state immediately after the angle 1 has been designated by the operator. In FIG. 14, the optical disk reproducing apparatus has already completed the storage up to the third recording area (S) of the angle 2. After that, the specification of the angle 1 is received, and the optical disc reproducing apparatus stores the fourth recording area (ta) of the angle 1 next to the area of the third recording area (se) of the angle 2. In this case, the video currently being reproduced is the second recording area of angle 2 and the second recording area of angle 2 and the third recording area of angle 2 after the change request of the operator is received. After the reproduction of the recording area is completed, the angle 1 is reproduced, and there is a problem that the time from the angle change of the operator to the angle change of the video actually reproduced increases. . In FIGS. 13, 14, and 15, the recording areas (G) to (T) each correspond to an interleave unit.

  The present invention solves the above-mentioned conventional problems, and determines the timing of performing the servo adjustment, and also determines the amount of information to be stored, thereby realizing seamless playback while always maintaining the optimum adjustment state, Also, an object of the present invention is to provide an excellent optical disc reproducing apparatus capable of shortening the information switching time when changing the video or audio reproduction sequence even if the information storage means functioning as a buffer is made longer than the time required for adjustment. Aim.

  In the present invention, a plurality of streams of video and audio are recorded as interleaved units, which are continuous data of a plurality of arbitrary sizes, and the plurality of interleaved units are recorded so as to be reproduced continuously without interruption during reproduction. Means for reading information from an optical disc, information storage means for storing information read from the optical disc, servo means for controlling rotation, focusing and tracking of the optical disc, and adjusting servo characteristics in the servo means. Servo adjustment means, a reproduction sequence change reception means for receiving a reproduction sequence change request specified by an operator, and a servo adjustment for the servo adjustment means when the reproduction sequence change reception means receives the reproduction sequence change request. Servo adjustment starting means that prohibits starting for a certain period of time Eteiru.

  According to this configuration, when the operator changes the reproduction sequence, the reproduction sequence change receiving means receives the change and prohibits the start of the servo adjustment for a certain period of time. Since data is no longer stored in the information storage means, all data in the information storage means can be reproduced, and video and audio can be prevented from being temporarily interrupted.

  The present invention further includes a servo adjustment starter for prohibiting the start of the servo adjustment to the servo adjuster for a certain period of time when the reproduction sequence change acceptor receives the reproduction sequence change request from the operator. Determines the timing to perform servo adjustment and determines the amount of information to be stored, so that seamless playback can be achieved while always maintaining the optimum adjustment state, and information storage means that functions as a buffer is required for adjustment. Even if the time is longer than a certain time, it is possible to provide an optical disc reproducing apparatus which has an effect of reducing the information switching time when changing the video and audio reproduction sequences.

  Hereinafter, an embodiment of an optical disk reproducing apparatus of the present invention will be described with reference to the drawings, taking a DVD video reproducing apparatus as an example. In the following description, a part corresponding to the description in the claims is the tenth embodiment.

(Embodiment 1)
FIG. 1 is a block diagram illustrating a schematic configuration of a playback unit of the DVD playback device according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes an optical disk, 2 denotes a pickup for reading information from a recording surface of the optical disk 1, and disk reading means including a signal processing circuit for correcting errors from the read information, and 3 denotes an image read by the disk reading means 2. Or information storage means for storing audio information and providing audio and video information in the form of a ring buffer to the decoding means 4; decoding means 4 for decoding the information provided by the information storage means 3 for video and audio; Servo means for controlling the reading means 2 so that the information on the optical disc 1 can be read normally, 6 servo adjusting means for adjusting the focus offset or tilt so that the servo means 5 can always carry out appropriate control, and 7 for the optical disc 1 Adjustment items that have different characteristics depending on the radial position of the Servo adjustment starting unit for starting to adjust the adjusting means 6, 8 is a data amount detecting means for detecting the amount of data stored in the information storage unit 3.

  The operation of the optical disk reproducing apparatus configured as described above will be described with reference to FIG. First, the servo of the optical disk 1 is applied to the rotation thereof and the optical pickup in the disk reading unit 2 in the focus direction and the tracking direction by the servo unit 5. The audio or video signal recorded on the optical disc 1 is read by the disc reading means 2 and sent to the information storage means 3. The information storage unit 3 is a ring buffer, and performs an operation of sequentially storing information sent from the disk reading unit 2 and sending the information to the decoding unit 4. The decoding means 4 demodulates and outputs a video signal and an audio signal from the input data. The servo adjustment means 6 is an adjustment means for absorbing a difference in focus offset and a difference in tilt characteristics due to a difference in the radial position of the optical disc 1 as described above, and adds an offset to the position of the optical pickup in the focus direction, respectively. The servo means 5 is adjusted so that the optimum jitter value is obtained, skew is added to the optical axis of the optical pickup, and the optimum jitter value is obtained. The servo adjustment starting means 7 functions to instruct the servo adjustment means 6 to start adjustment based on the current reproduction position on the optical disc 1 in the radial direction and the elapsed time from the time when the previous adjustment was performed. The data amount detection means 8 detects the data amount stored in the information storage means 3 and, if the data amount is equal to or less than a predetermined amount, prohibits the servo adjustment start means 7 from starting the adjustment to the servo adjustment means 6. Works as follows. Conversely, when the amount of data stored in the information storage unit 3 exceeds a certain amount, the operation is performed so that the adjustment start unit 7 can be instructed to start adjustment to the adjustment unit 6.

  As described above, according to the first embodiment of the present invention, the data amount detection unit 8 detects that the information in the information storage unit 3 is equal to or more than a certain amount, and performs a servo adjustment such as a focus offset adjustment. Therefore, even if reading of continuous information for reproducing video and audio is interrupted by servo adjustment, video and audio can be reproduced without interruption.

(Embodiment 2)
FIG. 2 is a block diagram illustrating a schematic configuration of a playback unit of the DVD playback device according to Embodiment 2 of the present invention. In FIG. 2, 1 is an optical disk, 2 is a disk reading unit, 3 is an information storage unit, 4 is a decoding unit, 5 is a servo unit, 6 is a servo adjustment unit, 7A is a servo adjustment start unit, and 9 is an information storage unit 3. Reproduction time detecting means 10 for calculating the time when all the stored data is converted into audio and video by the decoding means 4, and reproduction time comparison means 10 for comparing the reproduction time output from the reproduction time detection means 9 with a fixed value. Means.

  The operation of the optical disk reproducing apparatus configured as described above will be described with reference to FIG. First, the servo of the optical disk 1 is applied to the rotation thereof and the optical pickup in the disk reading unit 2 in the focus direction and the tracking direction by the servo unit 5. The audio or video signal recorded on the optical disc 1 is read by the disc reading means 2 and sent to the information storage means 3. The information storage unit 3 is a ring buffer, and performs an operation of sequentially storing information sent from the disk reading unit 2 and sending the information to the decoding unit 4. The decoding means 4 demodulates and outputs a video signal and an audio signal from the input data. The servo adjusting means 6 is an adjusting means for absorbing a difference in focus offset and a tilt characteristic due to a difference in a radial position of the optical disc 1, and adds an offset to a position of the optical pickup in a focus direction to respectively provide an optimum jitter value. And the skew is added to the optical axis of the optical pickup, and the servo means 5 is adjusted so as to obtain an optimum jitter value. The servo adjustment activating unit 7A functions to instruct the servo adjusting unit 6 to start the adjustment based on the current reproduction position on the optical disc 1 in the radial direction and the elapsed time from the time when the previous adjustment was performed.

  The reproduction time detection means 9 analyzes the data stored in the information storage means 3 and calculates the time when the data is demodulated into video and audio by the decoding means 4. In the case of a DVD video device, video data stored in the information storage means 3 is encoded by MPEG2. Time information to be decoded is added to each packet information coded by MPEG2, and the time information is retrieved from the data in the information storage means 3 to easily calculate the reproduction time. Can be. The reproduction time comparison means 10 compares the time when all the data in the information storage means 3 calculated by the reproduction time detection means 9 is reproduced with a certain time required for the servo adjustment. Is shorter than the predetermined time, the servo adjustment starting means 7A prohibits the servo adjustment means 6 from starting the servo adjustment. Conversely, when the reproduction time of all data in the information storage means 3 is longer than a certain time, the servo adjustment starting means 7A enables the servo adjustment means 6 to start servo adjustment.

  As described above, according to the second embodiment of the present invention, it is detected that the reproduction time by the information in the information storage means 3 is longer than a certain time or longer than the time required for servo adjustment. Since the servo adjustment such as the focus offset adjustment is performed, the video and the sound can be reproduced without interruption even if the reading of the continuous information for reproducing the video and the sound is interrupted by the servo adjustment.

(Embodiment 3)
FIG. 3 is a block diagram showing a schematic configuration of a playback unit of a DVD playback device according to Embodiment 3 of the present invention. In FIG. 3, reference numeral 1 indicates that a plurality of streams of video and audio are recorded as interleave units, which are continuous data of a plurality of arbitrary sizes, and the plurality of interleave units are continuously reproduced without interruption during reproduction. An optical disk on which (referred to as seamless playback) is recorded, 2 is a disk reading unit, 3 is an information storage unit, 4 is a decoding unit, and 5 is a servo unit. Reference numeral 11 denotes an address management unit that constantly manages a head address as table data for each interleave unit stored in the information storage unit 3, 12 denotes an address generation unit that generates a next storage address in the information storage unit 3, and 13 denotes an operation. This is a change request receiving means for detecting an angle change request made by a user.

  The operation of the optical disk reproducing device configured as described above will be described with reference to FIGS. 3, 13, 14, and 16. FIG. 16 shows an example of the data structure in the information storage means 3. In FIG. 16, (h) shows a first recording area of angle 2 and (ko) shows a second recording area of angle 1. First, the information in the optical disc 1 is configured as shown in FIG. That is, a multi-angle section of angles 1 to 3 is formed. The servo of the optical disk 1 is applied to the rotation thereof and the optical pickup in the disk reading unit 2 in the focus direction and the tracking direction by the servo unit 5. The audio or video signal recorded on the optical disc 1 is read by the disc reading means 2 and sent to the information storage means 3. The information storage unit 3 is a ring buffer, and performs an operation of sequentially storing information sent from the disk reading unit 2 and sending the information to the decoding unit 4. In the state of FIG. 14, the first recording area (h) of the angle 2, the second recording area (h) of the angle 2, and the third recording area (h) of the angle 2 are stored. The data being sent is the information recorded at the position (T), that is, the first recording area of the angle 2. The decoding means 4 demodulates and outputs a video signal and an audio signal from the input data.

  The reproduction sequence change receiving means 13 receives a change in the reproduction angle from the operator. For example, as shown in FIG. 14, when a request to change to the angle 1 is received during the reproduction of the first recording area (h) of the angle 2, the second recording area of the angle 2 managed by the address management means 11 The address generation means 12 generates the oldest address, that is, the start address of the second recording area (sa) of the angle 2 from the start address of the (sa) and the start address of the third area (se) of the angle 2. Then, it is passed to the disk reading means 2. The disk reading means 2 reads data from the optical disk 1 according to the new address. Thus, after the change to the angle 1 is received, the information stored in the information storage means 3 has a data structure as shown in FIG. That is, after the head address of the first recording area (h) of the angle 2 so far, the information of the second recording area (h) of the angle 1 is stored again.

  As described above, according to the third embodiment of the present invention, when a change in the reproduction angle is received, the data is re-stored in the information storage unit 3 so that the information in the information storage unit 3 is switched at the highest speed. , High-speed angle switching reproduction can be realized.

(Embodiment 4)
FIG. 4 is a block diagram illustrating a schematic configuration of a playback unit of a DVD playback device according to Embodiment 4 of the present invention. In FIG. 4, reference numeral 1 denotes an optical disc in which a plurality of streams of video and audio are recorded as interleave units, which are continuous data of a plurality of arbitrary sizes, and are recorded such that the plurality of interleave units are seamlessly reproduced at the time of reproduction. 2 is a disk reading means, 3 is an information storage means, 4 is a decoding means, and 5 is a servo means. Reference numeral 11 denotes an address management means for managing the head address of each interleave unit buffered in the information storage means 3, and reference numeral 14 denotes a time until the head address of each interleave unit managed by the address management means 11 is output from the information storage means 3. A reproduction time detecting means for calculating a time, a reproduction sequence change receiving means for receiving a reproduction sequence change request designated by an operator, and a reproduction time change means for starting the writing of data read from the optical disk 1 to the information storage means 3. , Address generating means for generating a write address to the information storage means 3.

  The operation of the optical disk reproducing device configured as described above will be described with reference to FIGS. 4, 13, 14, and 17. FIG. FIG. 17 shows an example of the data structure in the information storage means 3. In FIG. 17, (h) shows a first recording area of the angle 2, (b) shows a second recording area of the angle 2, and (s) shows a third recording area of the angle 1. First, the information in the optical disc 1 is configured as shown in FIG. That is, a multi-angle section of angles 1 to 3 is formed. The servo of the optical disk 1 is applied to the rotation thereof and the optical pickup in the disk reading unit 2 in the focus direction and the tracking direction by the servo unit 5. The audio or video signal recorded on the optical disc 1 is read by the disc reading means 2 and sent to the information storage means 3. The information storage unit 3 is a ring buffer, and performs an operation of sequentially storing information sent from the disk reading unit 2 and sending the information to the decoding unit 4. In the state of FIG. 14, the first recording area (h) of the angle 2, the second recording area (h) of the angle 2, and the third recording area (h) of the angle 2 are stored. The data being sent is the information recorded at the position (T), that is, the first recording area of the angle 2. The decoding means 4 demodulates and outputs a video signal and an audio signal from the input data.

  The reproduction sequence change receiving means 13 receives a change in the reproduction angle from the operator. For example, when a request to change to the angle 1 is received during the reproduction of the angle 2 as shown in FIG. 14, the reproduction time detecting means 14 sets the second recording area (servo) of the angle 2 managed by the address management means 11. ) And the start address of the third area (S) of the angle 2 to calculate the time until each interleave unit start address is output from the information storage means 3, and the address generation means 12 The oldest address among the conditions for which the calculation result is longer than a predetermined time, that is, the head address of the third recording area (S) of the angle 2 is generated and passed to the disk reading means 2. The disk reading means 2 reads data from the optical disk 1 according to the new address. Thus, after the change to the angle 1 is received, the information storage means 3 has a data structure as shown in FIG. That is, the information of the third recording area (s) of the angle 1 is stored again after the head address of the second recording area (s) of the angle 2 until now.

  As described above, according to the fourth embodiment of the present invention, when a change in the playback angle is received, the data in the information storage means 3 is deficient due to access, adjustment, etc., and no sound cutout or picture cutout occurs. In addition, by re-storing data in the information storage means 3 so that the information in the information storage means 3 is switched at the fastest speed, high-speed and seamless angle switching reproduction can be realized.

(Embodiment 5)
FIG. 5 is a block diagram showing a schematic configuration of a playback unit of a DVD playback device according to Embodiment 5 of the present invention. In FIG. 5, reference numeral 1 denotes an optical disc on which a plurality of streams of video and audio are recorded as interleave units, which are continuous data of a plurality of arbitrary sizes, and at the time of reproduction, the plurality of interleave units are recorded so as to be seamlessly reproduced. 2 is a disk reading means, 3 is an information storage means, 4 is a decoding means, 5 is a servo means, 11 is an address management means, 12 is an address generation means, 13 is a reproduction sequence change request receiving means, 14 is a reproduction time detection means, Reference numeral 15 denotes access time calculation means.

  The operation of the optical disk reproducing device configured as described above will be described with reference to FIGS. 5, 13, 14, and 17. FIG. First, the information in the optical disc 1 is configured as shown in FIG. That is, a multi-angle section of angles 1 to 3 is formed. The servo of the optical disk 1 is performed by the servo unit 5 in the focus direction and the tracking direction for the rotation thereof and for the optical pickup in the disk reading unit 2. The audio or video signal recorded on the optical disc 1 is read by the disc reading means 2 and sent to the information storage means 3. The information storage unit 3 is a ring buffer, and performs an operation of sequentially storing information sent from the disk reading unit 2 and sending the information to the decoding unit 4. In the state of FIG. 14, the first recording area (h) of the angle 2, the second recording area (h) of the angle 2, and the third recording area (h) of the angle 2 are stored. The data sent to is the information recorded in the position (T), that is, the first recording area of the angle 2. The decoding means 4 demodulates and outputs a video signal and an audio signal from the input data.

  The reproduction sequence change receiving means 13 receives a change in the reproduction angle from the operator. For example, when a request to change to the angle 1 is received during the reproduction of the angle 2 as shown in FIG. 14, the reproduction time detecting means 14 sets the second recording area (servo) of the angle 2 managed by the address management means 11. ), And the time until each interleave unit start address is output from the information storage means 3 with reference to the start address of the third area (S) of the angle 2 and the access time calculation means 15 Calculates the access time up to the start address of the next interleave unit, and the address generation means 12 detects that the detection time output by the reproduction time detection means 14 is longer than the access time to the next interleave unit output by the access time detection means 15 The oldest address where the condition is satisfied, that is, the head of the third recording area (sec) of angle 2 It generates a dress, and passes the disk read unit 2. The disk reading means 2 reads data from the optical disk 1 according to the new address. Thus, after the change to the angle 1 is received, the information storage means 3 has a data structure as shown in FIG. That is, the information of the third recording area (s) of the angle 1 is stored again after the head address of the second recording area (s) of the angle 2 until now.

  As described above, according to the fifth embodiment of the present invention, when a change in the reproduction angle is received, the data in the information storage unit 3 is deficient due to access, adjustment, and the like, and no sound cutout or picture cutout occurs. In addition, by re-storing data in the information storage means 3 so that the information in the information storage means 3 is switched at the fastest speed, high-speed and seamless angle switching reproduction can be realized.

(Embodiment 6)
FIG. 6 is a block diagram showing a schematic configuration of a playback unit of a DVD playback device according to Embodiment 6 of the present invention. In FIG. 6, reference numeral 1 denotes an optical disc in which a plurality of streams of video and audio are recorded as interleave units, which are continuous data of a plurality of arbitrary sizes, and are recorded such that the plurality of interleave units are seamlessly reproduced at the time of reproduction. 2 is a disk reading unit, 3 is an information storage unit, 4 is a decoding unit, 5 is a servo unit, 6 is a servo adjustment unit, 7B is a servo adjustment start unit, and 9 is all the information stored in the information storage unit 3. Reproduction time detecting means 16 for calculating the time required to perform the operation is an interleave unit size detecting means.

  The operation of the optical disk reproducing apparatus configured as described above will be described with reference to FIGS. FIG. 18 is a data structure diagram in the information storage means 3 during reproduction of the disc recorded as shown in FIG. In FIG. 18, (h) is the first recording area of the angle 2, (h) is the data currently being transferred to the decoding means 4, (z) is the data currently being read, and (te) is the interleave currently being read. Indicates the last address of the unit. First, the information in the optical disc 1 is configured as shown in FIG. That is, a multi-angle section of angles 1 to 3 is formed. The servo of the optical disk 1 is applied to the rotation thereof and the optical pickup in the disk reading unit 2 in the focus direction and the tracking direction by the servo unit 5. The audio or video signal recorded on the optical disc 1 is read by the disc reading means 2 and sent to the information storage means 3. The information storage unit 3 is a ring buffer, and performs an operation of sequentially storing information sent from the disk reading unit 2 and sending the information to the decoding unit 4. The servo adjustment means 6 is periodically activated by the servo adjustment activation means 7B, and functions to absorb variations in focus offset characteristics and tilt characteristics depending on the position of the disk. The reproduction time detecting means 9 calculates the time required for reproducing all the data currently stored in the information storage means 3. The interleave unit size detecting means 16 obtains the size of the interleave unit currently being read, as shown in FIG. 18, based on the information recorded in the management information on the disk. At this time, if the sum of the data reproduction time of the information storage means 3 and the time required for servo adjustment is larger than the read time up to the end of the interleave unit currently being read, the servo adjustment starting means 7B determines the adjustment time and the access time. Operates so as not to perform servo adjustment only when the data playback time is shorter than the sum, and when the sum of the playback time output by the playback time detection means and the servo adjustment time is smaller than the read time to the end of the interleave unit currently being read. Operates so as not to perform servo adjustment only when the data reproduction time is shorter than the servo adjustment time.

  As described above, according to the sixth embodiment of the present invention, even when an interleave unit section such as an angle section is being reproduced, all the information in the information storage unit 3 has been reproduced by the servo adjustment, and audio and video The servo adjustment is periodically started while performing the reproduction without interruption, and stable reproduction can be realized.

(Embodiment 7)
FIG. 7 is a block diagram showing a schematic configuration of a playback unit of a DVD playback device according to Embodiment 7 of the present invention. In FIG. 7, 1 is an optical disk, 2 is a disk reading unit, 3 is an information storage unit, 4 is a decoding unit, 5 is a servo unit, 6 is a servo adjustment unit, and 17 determines whether servo adjustment is necessary. When an area for which servo adjustment is determined to be unnecessary is being reproduced, a servo adjustment state determination means for limiting the size of the storage area in the information storage means 3.

  The operation of the optical disk reproducing device configured as described above will be described with reference to FIG. The servo of the optical disk 1 is applied to the rotation thereof and the optical pickup in the disk reading unit 2 in the focus direction and the tracking direction by the servo unit 5. The audio or video signal recorded on the optical disc 1 is read by the disc reading means 2 and sent to the information storage means 3. The information storage unit 3 is a ring buffer, and performs an operation of sequentially storing information sent from the disk reading unit 2 and sending the information to the decoding unit 4. The servo means 5 is adjusted periodically by the servo adjustment means 6 and functions to absorb variations in focus offset characteristics and tilt characteristics depending on the position of the disk. The servo adjustment state determination means 17 manages information as to whether or not adjustment has been performed in the past in the radial direction of the disk as table information, and determines whether or not servo adjustment is required at the position where the disk is currently being read. If it is determined that the radial position of the currently reproduced disc has already been adjusted in the past and no adjustment is necessary in the future, the size of the maximum storage area of the information storage means 3 is limited.

  As described above, according to the seventh embodiment of the present invention, when an interleave unit section such as an angle section is being reproduced, when it is determined that servo adjustment is not necessary, the maximum storage Even if the angle is changed in order to reduce the size of the area, since the amount of the reproduction data of the previous angle remaining in the information storage means 3 is small, the reproduction data of the next angle is directly stored in the information. Even if the data is stored from the next address during reading by the means 3, the angle change can be realized with a simple configuration, and the delay time at the time of the angle change can be reduced.

(Embodiment 8)
FIG. 8 is a block diagram showing a schematic configuration of a playback unit of a DVD playback device according to Embodiment 8 of the present invention. 8, 1 is an optical disk, 2 is a disk reading means, 3 is an information storing means, 4 is a decoding means, 5 is a servo means, and 8 is a data amount detecting means for detecting the amount of information stored in the information storing means 3. And these are the same as in the first embodiment. Reference numeral 18 denotes a first servo adjustment unit having a long servo adjustment time, 19 denotes a second servo adjustment unit having a short servo adjustment time, and 20 denotes a case where the amount of information detected by the data amount detection unit 8 exceeds a certain amount. This is a servo adjustment start unit that starts the first servo adjustment unit 18 with a long servo adjustment time and starts the second servo adjustment unit 19 with a short servo adjustment time when the amount is equal to or less than a predetermined amount.

  The operation of the optical disk reproducing apparatus configured as described above will be described with reference to FIG. First, the servo of the optical disk 1 is applied to the rotation thereof and the optical pickup in the disk reading unit 2 in the focus direction and the tracking direction by the servo unit 5. The audio or video signal recorded on the optical disc 1 is read by the disc reading means 2 and sent to the information storage means 3. The information storage unit 3 is a ring buffer, and performs an operation of sequentially storing information sent from the disk reading unit 2 and sending the information to the decoding unit 4. The decoding means 4 demodulates and outputs a video signal and an audio signal from the input data. The first and second servo adjustment units 18 and 19 are adjustment units for absorbing differences in focus offset and tilt characteristics due to differences in the radial position of the optical disc 1, and are provided at positions in the focus direction of the optical pickup, respectively. The servo means 5 is adjusted so that an offset is added and an optimum jitter value is obtained, and a skew is added to an optical axis of the optical pickup to obtain an optimum jitter value. The first servo adjustment unit 18 takes a large number of samples for measuring the jitter value, and the second servo adjustment unit 19 takes a small number of samples. For this reason, the first servo adjustment unit 18 requires more time for the adjustment than the second servo adjustment unit 19. However, the first adjusting unit 18 has a feature that its adjusting accuracy is higher than that of the second adjusting unit 19. The servo adjustment starting means 20 controls the first and second servo adjustment means 18 and 19 for servo adjustment based on the current reproduction position on the optical disc 1 in the radial direction and the elapsed time from the time when the previous adjustment was performed. Functions to command start. The data amount detecting means 8 detects the amount of data stored in the information storage means 3 and, when the data amount is equal to or smaller than the first comparison value, sends the first and second servo adjusting means 18 to the servo adjustment starting means 20. , And 19 are operated so as to prohibit the start command of the servo adjustment for the second servo adjustment means 19 if the first comparison value or more and the second comparison value or less are selected. If the comparison value exceeds, the first servo adjustment means 18 is activated.

  As described above, according to the eighth embodiment of the present invention, when there is room in the information in the information storage unit 3, the first servo adjustment unit 18 with high accuracy is activated, and the amount of information has no room. In this case, by activating the second servo adjustment means 19 having a low accuracy but a short adjustment time, the video and the sound can be reproduced without interruption while the adjustment is always performed.

(Embodiment 9)
FIG. 9 is a block diagram illustrating a schematic configuration of a playback unit of the DVD playback device according to Embodiment 1 of the present invention. In FIG. 9, 1 is an optical disk, 2 is a disk reading means, 3 is an information storing means, 4 is a decoding means, 5 is a servo means, 9 is a reproducing time detecting means, and 10 is a reproducing time comparing means. Same as in mode 2. Reference numeral 18 denotes a first servo adjusting unit having a long servo adjusting time, 19 denotes a second servo adjusting unit having a short servo adjusting time, and 20A is detected by the reproducing time detecting unit 9 based on a comparison result of the reproducing time comparing unit 10. If the reproduction time exceeds a certain time, the first servo adjustment means 18 having a long servo adjustment time is activated, and if the reproduction time is less than a certain time, the second servo adjustment means 19 having a short servo adjustment time is activated. This is an adjustment starting means.

  The operation of the optical disk reproducing apparatus configured as described above will be described with reference to FIG. First, the servo of the optical disk 1 is applied to the rotation thereof and the optical pickup in the disk reading unit 2 in the focus direction and the tracking direction by the servo unit 5. The audio or video signal recorded on the optical disc 1 is read by the disc reading means 2 and sent to the information storage means 3. The information storage unit 3 is a ring buffer, and performs an operation of sequentially storing information sent from the disk reading unit 2 and sending the information to the decoding unit 4. The decoding means 4 demodulates and outputs a video signal and an audio signal from the input data. The first and second servo adjustment units 18 and 19 are adjustment units for absorbing differences in focus offset and tilt characteristics due to differences in the radial position of the optical disc 1, and are provided at positions in the focus direction of the optical pickup, respectively. The servo means 5 is adjusted so that an offset is added and an optimum jitter value is obtained, and a skew is added to an optical axis of the optical pickup to obtain an optimum jitter value. The first servo adjustment unit 18 takes a large number of samples for measuring the jitter value, and the second servo adjustment unit 19 takes a small number of samples. For this reason, the first servo adjustment unit 18 requires more time for the adjustment than the second servo adjustment unit 19. However, the first adjusting unit 18 has a feature that its adjusting accuracy is higher than that of the second adjusting unit 19. The servo adjustment starting means 20 controls the first and second servo adjustment means 18 and 19 for servo adjustment based on the current reproduction position on the optical disc 1 in the radial direction and the elapsed time from the time when the previous adjustment was performed. Functions to command start. The reproduction time detecting means 9 calculates a time when the data stored in the information storage means 3 is reproduced by the decoding means 4. The reproduction time comparing means 10 detects a time when the data amount stored in the information storage means 3 is reproduced, and when the data amount is equal to or less than the first comparison value, the reproduction time comparing means 10 sends the servo adjustment starting means 20A to the servo adjusting means 20A. The operation is performed so as to prohibit the start command of the servo adjustment for 18, 18 and, when it is equal to or more than the first comparison value and equal to or less than the second comparison value, the second servo adjustment means 19 is operated, and If it exceeds the second comparison value, the first servo adjusting means 18 operates to be activated.

  As described above, according to the ninth embodiment of the present invention, when there is room in the information in the information storage unit 3, the first servo adjustment unit 18 with high accuracy is activated, and there is no room in the amount of information. In this case, by activating the second servo adjustment means 19 having a low accuracy but a short adjustment time, the video and the sound can be reproduced without interruption while the adjustment is always performed.

(Embodiment 10)
FIG. 10 is a block diagram illustrating a schematic configuration of a playback unit of the DVD playback device according to Embodiment 1 of the present invention. In FIG. 10, reference numeral 1 denotes an optical disc on which a plurality of streams of video and audio are recorded as interleave units which are a plurality of continuous data of an arbitrary size, and which are recorded such that the plurality of interleave units are seamlessly reproduced at the time of reproduction. 2 is a disk reading unit, 3 is an information storage unit, 4 is a decoding unit, 5 is a servo unit, 6 is a servo adjustment unit, 7C is a servo adjustment start unit, and 13 receives a change request of a reproduction sequence designated by an operator. This is a reproduction sequence change receiving means.

  The operation of the optical disk reproducing apparatus configured as described above will be described with reference to FIG. First, the servo of the optical disk 1 is applied to the rotation thereof and the optical pickup in the disk reading unit 2 in the focus direction and the tracking direction by the servo unit 5. The audio or video signal recorded on the optical disc 1 is read by the disc reading means 2 and sent to the information storage means 3. The information storage unit 3 is a ring buffer, and performs an operation of sequentially storing information sent from the disk reading unit 2 and sending the information to the decoding unit 4. The decoding means 4 demodulates and outputs a video signal and an audio signal from the input data. The servo adjustment means 6 is an adjustment means for absorbing a difference in focus offset and a difference in tilt characteristics due to a difference in a radial position of the optical disc 1, and adds an offset to a position in the focus direction of the optical pickup to provide an optimum jitter. The servo means 5 is adjusted so as to obtain the optimum jitter value by adding a skew to the optical axis of the optical pickup. The reproduction sequence change request receiving means 13 receives a request regarding a change in the reproduction sequence in units of interleave units, such as an angle change of the operator. When the reproduction sequence change request receiving unit 13 receives the change of the reproduction sequence, the servo adjustment start unit 7C prohibits the servo adjustment unit 6 from starting the servo adjustment for a certain period of time.

  As described above, according to the tenth embodiment of the present invention, when a change in the reproduction angle is received, the servo adjustment is inhibited for a certain period of time, so that the information generated by the access generated by the angle switching and the servo adjustment are performed. Even if the operation of accumulating data in the storage means 3 is temporarily interrupted, it is possible to realize an optical disk reproducing apparatus in which reproduced video and audio are hardly interrupted.

  As described above, the optical disc reproducing apparatus according to the present invention determines the timing for performing the servo adjustment, and also determines the amount of information to be stored, thereby realizing seamless reproduction while always maintaining the optimum adjustment state, In addition, even if the information storage means functioning as a buffer is made longer than the time required for the adjustment, it has the effect of shortening the information switching time when changing the video or audio reproduction sequence. The start timing of the adjustment is determined by the state of the information storage means functioning as a data buffer, so that the physical characteristics variation due to the position of the disk-type storage medium and the characteristic deterioration caused by the tilt of the disk are periodically reduced. It enables seamless playback while making corrections, and is defined in the video playback format such as DVD. Angle switching of recorded video in an interleaved unit, such as multi-angle are useful as an optical disc reproducing apparatus or the like to be performed at high speed.

FIG. 1 is a block diagram of an optical disc reproducing apparatus according to Embodiment 1 of the present invention. Block diagram of an optical disc reproducing apparatus according to Embodiment 2 of the present invention Block diagram of an optical disc reproducing apparatus according to Embodiment 3 of the present invention Block diagram of optical disk reproducing apparatus according to Embodiment 4 of the present invention Block diagram of optical disk reproducing apparatus according to Embodiment 5 of the present invention Block diagram of optical disc reproducing apparatus according to Embodiment 6 of the present invention Block diagram of optical disc reproducing apparatus according to Embodiment 7 of the present invention Block diagram of optical disk reproducing apparatus according to Embodiment 8 of the present invention Block diagram of optical disc reproducing apparatus according to Embodiment 9 of the present invention Block diagram of optical disc reproducing apparatus according to Embodiment 10 of the present invention Characteristics diagram of focus offset value of optical disk Characteristics diagram of radial tilt value of optical disk Data structure diagram of multi-angle part on disk Diagram of data structure in information storage means during multi-angle playback Diagram of data structure in information storage means during multi-angle playback Diagram of data structure in information storage means during multi-angle playback Diagram of data structure in information storage means during multi-angle playback Diagram of data structure in information storage means during multi-angle playback

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Disk reading means 3 Information storage means 4 Decoding means 5 Servo means 6, 18, 19 Servo adjustment means 7, 7A, 7B, 7C, 20, 20A Servo adjustment activation means 8 Data amount detection means 9 Reproduction time detection means 10 Reproduction time comparison means 11 Address management means 12 Address generation means 13 Reproduction sequence change receiving means 14 Reproduction time detection means 15 Access time calculation means 16 Interleave unit size detection means 17 Servo adjustment state judgment means (A), (A), (C) Focus offset value (d), (o), (f) Tilt value (g) First recording area of angle 1 (h) First recording area of angle 2 (f) First recording area of angle 3 (K) Second recording area of Angle 1 (S) Second recording area of Angle 2 (S) Angle (3) Third recording area of Angle 1 (S) Third recording area of Angle 2 (S) Third recording area of Angle 3 (T) Fourth angle 1 Recording area

Claims (3)

  A plurality of streams of video and audio are recorded as interleave units, which are continuous data of a plurality of arbitrary sizes. At the time of reproduction, information is recorded from an optical disc that is recorded so that the plurality of interleave units are reproduced continuously without interruption. Disk reading means for reading information, information storage means for storing information read from the optical disk, servo means for controlling rotation, focusing and tracking of the optical disk, and servo adjustment means for adjusting servo characteristics of the servo means A reproduction sequence change receiving means for receiving a reproduction sequence change request specified by an operator; and, when the reproduction sequence change receiving means receives the reproduction sequence change request, activation of servo adjustment to the servo adjustment means for a predetermined time. An optical disk with a servo adjustment start-up means Disk reproducing apparatus.   2. The optical disk reproducing apparatus according to claim 1, wherein said servo adjusting means performs a focus offset adjustment.   3. The optical disk reproducing apparatus according to claim 1, wherein the servo adjustment unit performs tilt adjustment.

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