JP3853810B2 - Optical disk playback device - Google Patents

Description

  The present invention relates to an optical disc apparatus for optically recording / reproducing data such as a compact disc (CD) and a digital video disc (DVD), and in particular, an information storage means that mainly functions as a data buffer at the start timing of servo system adjustment. An optical disc playback apparatus that allows seamless playback while periodically correcting variations in physical characteristics depending on the position of the disk type storage medium and characteristics deterioration caused by the tilt of the disk by determining the adjustment timing according to the state of It is about. In addition, the present invention relates to an optical disk reproducing apparatus in which angle switching of video recorded by an interleave unit such as a multi-angle defined in a video reproduction format such as a DVD is performed at high speed.

Conventionally, a disk-type recording / reproducing apparatus with a servo adjustment function at the time of reading information is a drive device that rotates a disk-type storage medium, an optical pickup that optically reads information, and an information reading position detection that detects an information reading position of the optical pickup Means, and a focus offset adjustment means, so that optimum reading can be performed at any position on the optical disk without being affected by offset deviation due to the position of the disk, change with time, offset deviation due to temperature change, Servo adjustment at the time of reading information is performed (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 11-007638

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

  FIG. 11 shows an example of the focus offset characteristic of an optical disc that is played back by a DVD video playback device. In FIG. 11, the horizontal axis is the distance in the radial direction of the disc, the vertical axis is the distance from the focus point to the optimum reading point (ie, focus offset), (A) is the focus offset near the inner periphery, and (A) is The focus offset near the middle circumference and (c) shows the focus offset near the outer circumference. As is apparent from this figure, the optical disc has different focus offset characteristics depending on the radial position of the disc, and it is necessary to always perform focus offset adjustment when reading the optical disc optimally.

  FIG. 12 shows an example of the radial tilt characteristic of the optical disc played by the DVD video playback device. In FIG. 12, the horizontal axis is the radial distance of the disk, the vertical axis is the radial tilt characteristic, (D) is the radial tilt near the inner circumference, (E) is the radial tilt near the middle circumference, and (F) is the outer circumference. The radial tilt in the vicinity is shown. As is apparent from this figure, the optical disc has different tilt characteristics depending on the radial position of the disc, and it is necessary to always perform tilt adjustment when reading the optical disc optimally.

  On the other hand, DVD video has a function called multi-angle playback that seamlessly switches videos shot from a plurality of camera angles. This function plays back a disc that is recorded by dividing an area continuously recorded of a predetermined data size by the number of angles, and reads only the video information of the angle specified by the operator while repeatedly accessing it. , Will play. If the operator changes the desired angle during playback, the angle is switched by reading the data string of the corresponding angle.

  When performing such reproduction, if the information storage means is configured with a buffer size necessary for performing servo adjustment during reproduction, the angle storage request is received and stored in the information storage means as in the prior art. When the data is changed, there is a second problem that a video of a new angle is not reproduced unless all the data already stored in the information storage means is reproduced.

  FIG. 13 is a conceptual diagram showing a method for recording and reproducing a multi-angle video on a video disc reproduced by a DVD video reproducing apparatus. In the figure, (K) is the first recording area of Angle 1, (K) is the first recording area of Angle 2, (K) is the first recording area of Angle 3, and (K) is the second recording area of Angle 1. , (Sa) is the second recording area of angle 2, (si) is the second recording area of angle 3, (su) is the third recording area of angle 1, (c) is the third recording area of angle 2, ( S) is the third recording area of angle 3, (T) is the fourth recording area of angle 1, and (G) is a line indicating access when the DVD video playback apparatus plays back.

  When the DVD video playback apparatus plays back a multi-angle video section, for example, in the case of a video signal having three angles, the DVD video playback device is divided into predetermined data amounts and each is recorded on the disc in order. When playing back such a disc, the following is performed every time playback of one angle recording area is completed based on the angle number specified by the operator (in the example shown, the angle 2 is specified). Access to the recording position of the same angle, and play sequentially.

  14 and 15 show the data structure of the information storage means in the DVD video playback apparatus when the DVD video playback apparatus accepts an angle change request from the operator. 14 and 15, (H) indicates the position where the current data is reproduced, and (T) indicates the position where the current data is stored. FIG. 14 shows a state in which the reproduction of the angle 2 is being performed, and FIG. 15 shows a state immediately after the designation of the angle 1 is received from the operator. In FIG. 14, the optical disk reproducing apparatus has already completed the storage up to the third recording area (second) of the angle 2. After that, the designation of angle 1 is accepted, and the optical disc reproducing apparatus stores the fourth recording area (angle) of angle 1 next to the third recording area (cell) of angle 2. In this case, the video currently being played is the second recording area (angle) of angle 2, and after accepting the operator's change request, the second recording area of angle 2 and the third recording area of angle 2 After the reproduction of the recording area is completed, the angle 1 is reproduced, and there is a problem that the time from the change of the angle of the operator to the change of the angle of the actually reproduced image becomes long. . In FIG. 13, FIG. 14, and FIG. 15, recording areas (K) to (T) correspond to interleave units, respectively.

  The present invention solves the above-mentioned conventional problems, and by determining the timing for performing servo adjustment and determining the amount of information to be stored, it is possible to achieve seamless reproduction while always maintaining the optimum adjustment state. An object of the present invention is to provide an optical disc reproducing apparatus.

  The present invention relates to a disk reading means for reading information from an optical disk, an information storage means for storing information read from the optical disk, a servo means for controlling rotation, focusing and tracking of the optical disk, and a servo in the servo means. First and second servo adjustment means having different servo adjustment times for adjusting characteristics, data amount detection means for detecting the amount of information stored in the information storage means, and information amount detected by the data amount detection means Servo adjustment activation means for activating the first servo adjustment means having a long servo adjustment time when the value exceeds a certain amount; It has.

  With this configuration, the first and second servo adjustment means are provided, the first servo adjustment means has a longer adjustment time than the second adjustment means, and the data amount comparison means is provided in the information storage means. Compare the data amount. If the data amount is larger than a certain amount, start the first servo adjustment means with a long adjustment time. If the data amount is small, start the second servo adjustment means with a short adjustment time. Thus, the servo adjustment can always be started without interruption of the reproduction data of the information storage means.

  The present invention also provides a disk reading means for reading information from an optical disk, an information storage means for storing information read from the optical disk, a servo means for controlling rotation, focusing and tracking of the optical disk, and a servo means First and second servo adjustment means having different servo adjustment times for adjusting servo characteristics, reproduction time detection means for calculating a time for reproducing all information stored in the information storage means, and the reproduction A reproduction time comparison means for comparing the reproduction time detected by the time detection means with a fixed time; and a first servo having a long servo adjustment time when the reproduction time detected by the reproduction time detection means exceeds the fixed time. Start the adjustment means, and if the time is less than a certain time, the second servo adjustment with a short servo adjustment time And a servo adjustment starting unit to start the stage.

  With this configuration, the first and second servo adjustment units are provided, and the first servo adjustment unit has a longer adjustment time than the second adjustment unit, and the reproduction time comparison / comparison unit is included in the information storage unit. If the time is longer than a certain time, the first servo adjustment means with a long adjustment time is started. If the time is short, the second servo adjustment with a short adjustment time is started. By starting the means, the servo adjustment can always be started without interruption of the reproduction data of the information storage means.

  The present invention is based on the first and second servo adjustment means having different servo adjustment times for adjusting the servo characteristics, the amount of data in the information storage means, or the time during which the data is reproduced. Servo adjustment activation means that selects the optimal one of the servo adjustment means and determines the activation timing, and determines the timing when the servo adjustment activation means performs servo adjustment, and also determines the amount of information to be stored By doing so, it is possible to provide an optical disc reproducing apparatus having an effect that seamless reproduction can be realized while always maintaining an optimal adjustment state.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an optical disk playback apparatus according to the present invention will be described below with reference to the drawings, taking a DVD video playback apparatus as an example. In the following description, the parts corresponding to the description of the claims are the eighth and ninth embodiments.

(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of a playback unit of a DVD playback apparatus according to Embodiment 1 of the present invention. In FIG. 1, 1 is an optical disk, 2 is a pickup for reading information from the recording surface of the optical disk 1, and disk reading means including a signal processing circuit for correcting an error from the read information, and 3 is an image read by the disk reading means 2. Alternatively, information storage means for storing audio information and providing audio and video information to the decoding means 4 in a ring buffer format, 4 is decoding means for decoding video, audio and the like provided by the information storage means 3, and 5 is a disk Servo means for performing control so that the reading means 2 can normally read information on the optical disk 1, 6 for servo adjustment means for adjusting focus offset or tilt so that the servo means 5 can always perform appropriate control, and 7 for optical disk 1. The adjustment items whose characteristics differ 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 optical disk 1 is servoed by the servo means 5 in the focus direction and the tracking direction with respect to the rotation and the optical pickup in the disk reading means 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 means 3 is a ring buffer, and sequentially stores information sent from the disk reading means 2 and sends it out to the decoding means 4. The decoding unit 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 the difference in focus offset and tilt characteristics due to the difference in radial position of the optical disc 1 as described above, and adds an offset to the position in the focus direction of the optical pickup, The servo means 5 is adjusted so that the optimum jitter value is obtained, and a skew is added to the optical axis of the optical pickup to obtain the optimum jitter value. The servo adjustment activation means 7 functions to instruct the servo adjustment means 6 to start adjustment based on the current reproduction position in the radial direction on the optical disc 1 and the time elapsed since the previous adjustment. The data amount detection means 8 detects the amount of data stored in the information storage means 3, and if it is less than a certain amount, the servo adjustment activation means 7 prohibits the adjustment start command for the servo adjustment means 6. To work. Conversely, when the amount of data stored in the information storage unit 3 exceeds a certain amount, the adjustment activation unit 7 operates so as to enable an adjustment activation command 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 greater than a certain amount, and performs servo adjustment such as focus offset adjustment. Therefore, even if reading of continuous information for reproducing video and sound is interrupted by servo adjustment, the video and sound can be reproduced without interruption.

(Embodiment 2)
FIG. 2 is a block diagram showing a schematic configuration of the playback unit of the DVD playback apparatus in the second embodiment of the present invention. In FIG. 2, 1 is an optical disk, 2 is a disk reading means, 3 is information storage means, 4 is decoding means, 5 is servo means, 6 is servo adjustment means, 7A is servo adjustment activation means, and 9 is information storage means 3. Reproduction time detecting means for calculating the time when all the accumulated data is converted into audio and video by the decoding means 4, and 10 is a reproduction time comparison for comparing the reproduction time output from the reproduction time detecting means 9 with a constant value. Means.

  The operation of the optical disk reproducing apparatus configured as described above will be described with reference to FIG. First, the optical disk 1 is servoed by the servo means 5 in the focus direction and the tracking direction with respect to the rotation and the optical pickup in the disk reading means 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 means 3 is a ring buffer, and sequentially stores information sent from the disk reading means 2 and sends it out to the decoding means 4. The decoding unit 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 the difference in focus offset and tilt characteristics due to the difference in radial position of the optical disk 1 and adds an offset to the position in the focus direction of the optical pickup, respectively, so that an optimum jitter value is obtained. In addition, the servo means 5 is adjusted so that an optimum jitter value is obtained by adding a skew to the optical axis of the optical pickup. The servo adjustment activation means 7A functions to instruct the servo adjustment means 6 to start adjustment based on the current reproduction position in the radial direction on the optical disc 1 and the time elapsed since the previous adjustment.

  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 apparatus, video data stored in the information storage means 3 is encoded by MPEG2. Each packet information encoded by MPEG2 is added with time information to be decoded. By retrieving this time information from the data in the information storage means 3, the reproduction time can be calculated easily. Can do. The reproduction time comparison means 10 compares the time when all data in the information storage means 3 calculated by the reproduction time detection means 9 is reproduced with a certain time required for servo adjustment, and reproduces the reproduction time. Is shorter than a certain time, the servo adjustment starting means 7A prohibits the servo adjusting means 6 from starting servo adjustment. Conversely, when the reproduction time of all the data in the information storage means 3 is longer than a certain time, the servo adjustment activation means 7A enables the servo adjustment means 6 to activate servo adjustment.

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

(Embodiment 3)
FIG. 3 is a block diagram showing a schematic configuration of the reproducing unit of the DVD reproducing apparatus according to Embodiment 3 of the present invention. In FIG. 3, reference numeral 1 indicates that a plurality of video and audio streams are recorded as an interleave unit that is a plurality of continuous data of an arbitrary size, and at the time of reproduction, the plurality of interleave units are continuously reproduced without sound interruption. A recorded optical disk (referred to as seamless reproduction), 2 is a disk reading means, 3 is an information storage means, 4 is a decoding means, and 5 is a servo means. 11 is an address management unit that always manages the head address as table data for each interleave unit stored in the information storage unit 3, 12 is an address generation unit that generates the next storage address in the information storage unit 3, and 13 is an operation This is a change request accepting means for detecting an angle change request by a person.

  The operation of the optical disk reproducing apparatus configured as described above will be described with reference to FIGS. 3, 13, 14, and 16. FIG. FIG. 16 shows a data configuration example in the information storage means 3. In FIG. 16, (K) indicates the first recording area of angle 2, and (K) indicates the second recording area of angle 1. First, the information in the optical disc 1 is configured as shown in FIG. That is, the multi-angle section of angles 1-3 is comprised. The optical disk 1 is servoed by the servo means 5 with respect to its rotation and the optical pickup within the disk reading means 2 in the focus direction and the tracking direction. 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 means 3 is a ring buffer, and sequentially stores information sent from the disk reading means 2 and sends it out to the decoding means 4. In the state shown in FIG. 14, the first recording area (angle) of angle 2, the second recording area (sa) of angle 2, and the third recording area (second) of angle 2 are stored. The data being sent is the information recorded in the (t) position, that is, in the first recording area of the angle 2. The decoding unit 4 demodulates and outputs a video signal and an audio signal from the input data.

  The playback sequence change receiving means 13 receives a change in playback angle from the operator. For example, when the change request to the angle 1 is received during the reproduction of the first recording area (Q) of the angle 2 as shown in FIG. 14, the second recording area of the angle 2 managed by the address management means 11 From the start address of (S) and the start address of the third area (C) of Angle 2, the address generation means 12 generates the oldest address, that is, the start address of the second recording area (S) of 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. Thereby, after accepting the change to the angle 1, the information stored in the information storage means 3 has a data structure as shown in FIG. That is, the information of the second recording area (co) of angle 1 is re-stored after the first address of the first recording area (cube) of angle 2 so far.

  As described above, according to the third embodiment of the present invention, when the change of the reproduction angle is accepted, the data is re-stored in the information storage unit 3 so that the switching of the information in the information storage unit 3 becomes the fastest. By performing the above, it is possible to realize high-speed angle switching reproduction.

(Embodiment 4)
FIG. 4 is a block diagram showing a schematic configuration of the playback unit of the DVD playback apparatus in the fourth embodiment of the present invention. In FIG. 4, reference numeral 1 denotes an optical disc on which a plurality of video and audio streams are recorded as an interleave unit that is a plurality of continuous data of an arbitrary size, and is recorded so that a plurality of interleave units are seamlessly reproduced during reproduction. 2 is disk reading means, 3 is information storage means, 4 is decoding means, and 5 is servo means. Reference numeral 11 denotes an address management means for managing the start address of each interleave unit buffered in the information storage means 3, and reference numeral 14 denotes a time until each interleave unit start address managed by the address management means 11 is output from the information storage means 3. A reproduction time detecting means for calculating time, 13 is a reproduction sequence change accepting means for accepting a request for changing a reproduction series designated by an operator, and 12 is a time when writing of data read from the optical disc 1 to the information storage means 3 is started. The address generation unit generates a write address to the information storage unit 3.

  The operation of the optical disk reproducing apparatus configured as described above will be described with reference to FIGS. 4, 13, 14, and 17. FIG. 17 shows a data configuration example in the information storage means 3. In FIG. 17, (ku) indicates the first recording area of angle 2, (sa) indicates the second recording area of angle 2, and (su) indicates the third recording area of angle 1. First, the information in the optical disc 1 is configured as shown in FIG. That is, the multi-angle section of angles 1-3 is comprised. The optical disk 1 is servoed by the servo means 5 with respect to its rotation and the optical pickup within the disk reading means 2 in the focus direction and the tracking direction. 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 means 3 is a ring buffer, and sequentially stores information sent from the disk reading means 2 and sends it out to the decoding means 4. In the state shown in FIG. 14, the first recording area (angle) of angle 2, the second recording area (sa) of angle 2, and the third recording area (second) of angle 2 are stored. The data being sent is the information recorded in the (t) position, that is, in the first recording area of the angle 2. The decoding unit 4 demodulates and outputs a video signal and an audio signal from the input data.

  The playback sequence change receiving means 13 receives a change in playback angle from the operator. For example, when a request to change to angle 1 is received during playback of angle 2 as shown in FIG. 14, playback time detection means 14 receives the second recording area (support) of angle 2 managed by address management means 11. ) And the start address of the third area (2) of the angle 2, the time until each interleave unit start address is output from the information storage means 3 is calculated, and the address generation means 12 The oldest address, that is, the head address of the third recording area (angle) of the angle 2 is generated and the result 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. Thereby, after accepting the change to the angle 1, the information storage means 3 has a data structure as shown in FIG. That is, the information of the third recording area (angle) of angle 1 is re-stored next to the start address of the second recording area (angle) of angle 2 so far.

  As described above, according to the fourth embodiment of the present invention, when the change of the reproduction angle is accepted, the data in the information storage unit 3 is deficient due to access, adjustment, etc., so that no sound cuts or picture cuts occur. In addition, by re-storing the data in the information storage unit 3 so that the switching of the information in the information storage unit 3 becomes the fastest, it is possible to realize high-speed and seamless angle switching reproduction.

(Embodiment 5)
FIG. 5 is a block diagram showing a schematic configuration of the playback unit of the DVD playback apparatus in the fifth embodiment of the present invention. In FIG. 5, reference numeral 1 denotes an optical disc on which a plurality of video and audio streams are recorded as an interleave unit that is a plurality of continuous data of an arbitrary size, and is recorded so that a plurality of interleave units are seamlessly reproduced during reproduction. 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 acceptance means, 14 is a reproduction time detection means, Reference numeral 15 denotes access time calculation means.

  The operation of the optical disk reproducing apparatus configured as described above will be described with reference to FIGS. 5, 13, 14, and 17. First, the information in the optical disc 1 is configured as shown in FIG. That is, the multi-angle section of angles 1-3 is comprised. The optical disk 1 is servoed by the servo means 5 against its rotation and the optical pickup in the disk reading means 2 in the focus direction and the tracking direction. 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 means 3 is a ring buffer, and sequentially stores information sent from the disk reading means 2 and sends it out to the decoding means 4. In the state shown in FIG. 14, the first recording area (angle) of angle 2, the second recording area (angle) of angle 2, and the third recording area (second) of angle 2 are stored. The data sent to is the information recorded in the (t) position, that is, the first recording area of the angle 2. The decoding unit 4 demodulates and outputs a video signal and an audio signal from the input data.

  The playback sequence change receiving means 13 receives a change in playback angle from the operator. For example, when a request to change to angle 1 is received during playback of angle 2 as shown in FIG. 14, playback time detection means 14 receives the second recording area (support) of angle 2 managed by address management means 11. ) And the start address of the third area (second) of the angle 2, the time until each interleave unit start address is output from the information storage means 3 is calculated, and the access time calculation means 15 Calculates the access time to the head 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 larger than the access time to the next interleave unit output by the access time detection means 15. The oldest address that satisfies the condition, that is, the beginning of the third recording area (second) at 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. Thereby, after accepting the change to the angle 1, the information storage means 3 has a data structure as shown in FIG. That is, the information of the third recording area (angle) of angle 1 is re-stored next to the start address of the second recording area (angle) of angle 2 so far.

  As described above, according to the fifth embodiment of the present invention, when the change of the reproduction angle is accepted, the data in the information storage unit 3 is deficient due to access, adjustment, etc., so that no sound cuts or picture cuts occur. In addition, by re-storing the data in the information storage unit 3 so that the switching of the information in the information storage unit 3 becomes the fastest, it is possible to realize high-speed and seamless angle switching reproduction.

(Embodiment 6)
FIG. 6 is a block diagram showing a schematic configuration of the playback unit of the DVD playback apparatus in the sixth embodiment of the present invention. In FIG. 6, reference numeral 1 denotes an optical disc on which a plurality of video and audio streams are recorded as an interleave unit that is a plurality of continuous data of an arbitrary size, and is recorded so that a plurality of interleave units are seamlessly reproduced during reproduction. 2 is a disk reading means, 3 is an information storage means, 4 is a decoding means, 5 is a servo means, 6 is a servo adjustment means, 7B is a servo adjustment activation means, 9 is a reproduction of all information stored in the information storage means 3 The reproduction time detecting means 16 for calculating the time to be played, 16 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 playback of the recorded disc as shown in FIG. In FIG. 18, (K) is the first recording area of angle 2, (H) is the data currently being transferred to the decoding means 4, (T) is the data currently being read, and (T) is the interleave being currently read. Indicates the final address of the unit. First, the information in the optical disc 1 is configured as shown in FIG. That is, the multi-angle section of angles 1-3 is comprised. The optical disk 1 is servoed by the servo means 5 with respect to its rotation and the optical pickup within the disk reading means 2 in the focus direction and the tracking direction. 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 means 3 is a ring buffer, and sequentially stores information sent from the disk reading means 2 and sends it out to the decoding means 4. Servo adjustment means 6 is periodically activated by servo adjustment activation means 7B and functions to absorb variations in focus offset characteristics and tilt characteristics depending on the disk position. The reproduction time detection means 9 calculates the time required for all the data currently stored in the information storage means 3 to be reproduced. The interleave unit size detection 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 disc. 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 greater than the read time up to the end of the interleave unit currently being read, the servo adjustment activation means 7B sets the adjustment time and access time. Servo adjustment is performed only when the data playback time is shorter than the sum, and the sum of the playback time and servo adjustment time output by the playback time detection means is smaller than the readout time until the end of the currently reading interleave unit 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 played back, all the information in the information storage means 3 is played back by servo adjustment. Servo playback can be started regularly while performing playback without interruption, and stable playback can be realized.

(Embodiment 7)
FIG. 7 is a block diagram showing a schematic configuration of the playback unit of the DVD playback apparatus in the seventh embodiment of the present invention. In FIG. 7, 1 is an optical disk, 2 is a disk reading means, 3 is an information storage means, 4 is a decoding means, 5 is a servo means, 6 is a servo adjustment means, 17 is a judgment whether servo adjustment is necessary, In the case where an area where it is determined that the servo adjustment is unnecessary is reproduced, the servo adjustment state determination unit that limits the size of the storage area 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. The optical disk 1 is servoed by the servo means 5 with respect to its rotation and the optical pickup within the disk reading means 2 in the focus direction and the tracking direction. 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 means 3 is a ring buffer, and sequentially stores information sent from the disk reading means 2 and sends it out to the decoding means 4. The servo means 5 is periodically adjusted by the servo adjusting means 6 and functions to absorb variations in focus offset characteristics and tilt characteristics depending on the disk position. The servo adjustment state determination unit 17 manages information on 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 necessary at the position currently being read. When it is determined that the radial position of the currently reproduced disc has already been adjusted in the past and no further adjustment is necessary, 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, the maximum storage of the information storage means is determined when it is determined that servo adjustment is not necessary. Even if there is an angle change or the like in order to reduce the size of the area, the amount of reproduction data of the previous angle remaining in the information storage means 3 is small. Even if the data is stored from the next address being read by the means 3, the angle can be changed with a simple configuration, and the delay time at the time of changing the angle can be shortened.

(Embodiment 8)
FIG. 8 is a block diagram showing a schematic configuration of the playback unit of the DVD playback apparatus in the eighth embodiment of the present invention. In FIG. 8, 1 is an optical disk, 2 is a disk reading means, 3 is an information storage means, 4 is a decoding means, 5 is a servo means, and 8 is a data amount detection means for detecting the amount of information stored in the information storage means 3. These are the same as those in the first embodiment. 18 is a first servo adjustment means having a long servo adjustment time, 19 is a second servo adjustment means having a short servo adjustment time, and 20 is a case where the information amount detected by the data amount detection means 8 exceeds a certain amount. The first servo adjustment means 18 having a long servo adjustment time is activated. When the servo adjustment time is less than a certain amount, the second servo adjustment means 19 having a short servo adjustment time is activated.

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

  As described above, according to the eighth embodiment of the present invention, when there is a margin in the information in the information storage unit 3, the first servo adjustment unit 18 with high accuracy is activated and there is no margin in the amount of information. In this case, by starting the second servo adjustment means 19 with a low accuracy but a short adjustment time, it is possible to reproduce the video and the sound without interruption while always performing the adjustment.

(Embodiment 9)
FIG. 9 is a block diagram showing a schematic configuration of the playback unit of the DVD playback apparatus in the first embodiment of the present invention. In FIG. 9, 1 is an optical disk, 2 is a disk reading means, 3 is an information storage means, 4 is a decoding means, 5 is a servo means, 9 is a reproduction time detection means, and 10 is a reproduction time comparison means. It is the same as Form 2. 18 is a first servo adjustment means having a long servo adjustment time, 19 is a second servo adjustment means having a short servo adjustment time, and 20A is detected by the reproduction time detection means 9 based on the comparison result of the reproduction time comparison means 10. If the playback time exceeds a certain time, the first servo adjustment means 18 having a long servo adjustment time is activated. If the reproduction time is less than the certain time, the second servo adjustment means 19 having a short servo adjustment time is activated. It 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 optical disk 1 is servoed by the servo means 5 in the focus direction and the tracking direction with respect to the rotation and the optical pickup in the disk reading means 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 means 3 is a ring buffer, and sequentially stores information sent from the disk reading means 2 and sends it out to the decoding means 4. The decoding unit 4 demodulates and outputs a video signal and an audio signal from the input data. The first and second servo adjustment means 18 and 19 are adjustment means for absorbing differences in focus offset and tilt characteristics due to differences in the radial position of the optical disc 1, and are respectively located at positions in the focus direction of the optical pickup. The servo means 5 is adjusted so as to obtain an optimum jitter value by adding an offset and adding a skew to the optical axis of the optical pickup. The first servo adjusting means 18 takes a large number of samples for measuring the jitter value, and the second servo adjusting means 19 takes a small number of samples. For this reason, the first servo adjustment means 18 requires more time for the adjustment than the second servo adjustment means 19. However, the first adjusting means 18 has a feature that its adjustment accuracy is higher than that of the second adjusting means 19. The servo adjustment activation means 20 performs servo adjustment on the first and second servo adjustment means 18 and 19 according to the current radial reproduction position on the optical disc 1 and the elapsed time from the time of the previous adjustment. Functions to command start. The reproduction time detection unit 9 calculates a time when the data stored in the information storage unit 3 is reproduced by the decoding unit 4. The reproduction time comparison means 10 detects the time when the amount of data stored in the information storage means 3 is reproduced, and if it is less than or equal to the first comparison value, the reproduction time comparison means 10 sends a servo adjustment means to the servo adjustment activation means 20A. 18 and 18 are operated so as to prohibit the servo adjustment start command, and when the value is equal to or greater than the first comparison value and equal to or less than the second comparison value, the second servo adjustment means 19 is selected. When the second comparison value is exceeded, the first servo adjustment means 18 operates so as to be activated.

  As described above, according to the ninth embodiment of the present invention, when there is a margin in the information in the information storage unit 3, the first servo adjustment unit 18 with high accuracy is activated and there is no margin in the amount of information. In this case, by starting the second servo adjustment means 19 with a low accuracy but a short adjustment time, it is possible to reproduce the video and the sound without interruption while always performing the adjustment.

(Embodiment 10)
FIG. 10 is a block diagram showing a schematic configuration of the playback unit of the DVD playback apparatus in the first embodiment of the present invention. In FIG. 10, reference numeral 1 denotes an optical disc on which a plurality of video and audio streams are recorded as an interleave unit that is a plurality of continuous data of an arbitrary size, and is recorded so that a 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 starting unit, and 13 is a request for changing a reproduction sequence designated by an operator. This is a reproduction sequence change acceptance means.

  The operation of the optical disk reproducing apparatus configured as described above will be described with reference to FIG. First, the optical disk 1 is servoed by the servo means 5 in the focus direction and the tracking direction with respect to the rotation and the optical pickup in the disk reading means 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 means 3 is a ring buffer, and sequentially stores information sent from the disk reading means 2 and sends it out to the decoding means 4. The decoding unit 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 the difference in focus offset and tilt characteristics due to the difference in radial position of the optical disc 1, and adds an offset to the position of the optical pickup in the focus direction to obtain the optimum jitter. The servo means 5 is adjusted so as to obtain an optimum jitter value by adding a skew to the optical axis of the optical pickup. The reproduction sequence change request accepting means 13 accepts a request relating to the change of the reproduction sequence in units of interleave units such as the angle switching of the operator. Servo adjustment activation means 7C prohibits servo adjustment activation in servo adjustment means 6 for a certain period of time when reproduction sequence change request accepting means 13 accepts a change in reproduction series.

  As described above, according to the tenth embodiment of the present invention, when the change of the reproduction angle is accepted, the information storage unit is operated by the access and the servo adjustment that are generated by the angle switching by acting to prohibit the servo adjustment. Even if the data storage operation to 3 is temporarily interrupted, it is possible to realize an optical disc playback apparatus in which the playback video and audio are not easily interrupted.

  As described above, the optical disk reproducing apparatus according to the present invention can realize seamless reproduction while always maintaining the optimum adjustment state by determining the timing for performing servo adjustment and determining the amount of information to be stored. By determining the adjustment timing according to the state of the information storage means that has the effect and mainly the servo system adjustment start-up function as a data buffer, the physical characteristics variation due to the position of the disk type storage medium, the disk tilt This is useful as an optical disk playback apparatus that can be played back seamlessly while periodically correcting the characteristic degradation caused by the above.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Disc 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 starting 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 acceptance means 14 Reproduction time detection means 15 Access time calculation means 16 Interleave unit size detection means 17 Servo adjustment state determination means (a), (b), (c) ) Focus offset value (D), (E), (F) Tilt value (G) First recording area of angle 1 (K) First recording area of angle 2 (K) First recording area of angle 3 (G) Second recording area of angle 1 (S) Second recording area of angle 2 (S) An Second recording area of Guru 3 (S) Third recording area of Angle 1 (C) Third recording area of Angle 2 (G) Third recording area of Angle 3 (T) Fourth recording area of Angle 1 Recording area

Claims (6)

  A disk reading means for reading information from the optical disk, an information storage means for storing information read from the optical disk, a servo means for controlling rotation, focusing and tracking of the optical disk, and adjusting servo characteristics in the servo means The first and second servo adjustment means having different servo adjustment times, the data amount detection means for detecting the information amount stored in the information storage means, and the information amount detected by the data amount detection means has a fixed amount. If it exceeds, the first servo adjustment means having a long servo adjustment time is activated, and if it is less than a certain amount, the optical disk includes a servo adjustment activation means for activating the second servo adjustment means having a short servo adjustment time. Playback device.   2. The optical disk reproducing apparatus according to claim 1, wherein the first and second servo adjusting means perform focus offset adjustment.   3. The optical disk reproducing apparatus according to claim 1, wherein the first and second servo adjusting means perform tilt adjustment.   A disk reading means for reading information from the optical disk, an information storage means for storing information read from the optical disk, a servo means for controlling rotation, focusing and tracking of the optical disk, and adjusting servo characteristics in the servo means First and second servo adjustment means having different servo adjustment times, a reproduction time detection means for calculating a time for reproducing all information stored in the information storage means, and detection by the reproduction time detection means A reproduction time comparison means for comparing the reproduced time with a certain time, and a first servo adjustment means having a long servo adjustment time is activated when the reproduction time detected by the reproduction time detection means exceeds the certain time. If the time is less than a certain time, the second servo adjustment means having a short servo adjustment time is activated. Optical disk reproducing apparatus having a turbo adjustment starting unit.   5. The optical disk reproducing apparatus according to claim 4, wherein the first and second servo adjusting means perform focus offset adjustment.   6. The optical disk reproducing apparatus according to claim 4, wherein the first and second servo adjusting means perform tilt adjustment.

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