JP3926692B2 - Optical disk playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
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.
[0002]
[Prior art]
Conventionally, a disk-type recording / reproducing apparatus with a servo adjustment function at the time of information reading has 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 when reading information.
[0003]
[Problems to be solved by the invention]
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.
[0004]
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.
[0005]
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.
[0006]
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.
[0007]
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.
[0008]
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.
[0009]
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.
[0010]
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.
[0011]
The present invention solves the above-described conventional first and second problems. By determining the timing for performing adjustment and determining the amount of information to be stored, it is possible to seamlessly maintain an optimal adjustment state at all times. An excellent optical disc playback device that can shorten the information switching time when changing the playback sequence of video and audio even if the information storage means that realizes playback and functions as a buffer is made longer than the time required for adjustment The purpose is to provide.
[0012]
[Means for Solving the Problems]
In the present invention, 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 during playback, the plurality of interleave units are recorded so as to be played continuously without interruption. An optical disk, a disk reading means for reading information from the optical disk, an information storage means for storing information read from the optical disk, and a head address of each interleave unit buffered in the information storage means An address management unit, a reproduction sequence change accepting unit that accepts a reproduction sequence change request designated by an operator, and a write address to the information storage unit when starting to write data read from the optical disk into the information storage unit Address generating means for generating.
[0013]
With this configuration, when a plurality of interleave units are stored in the information storage means, there is a reproduction sequence change request such as an angle switching request, and when the reproduction sequence change acceptance means accepts the reproduction sequence change request, the address The generation unit generates the oldest address from among a plurality of interleave unit start addresses managed by the address management unit, and starts reading the recording data of the next angle from that address. As a result, the angle can be switched at high speed without interruption of video and audio.
[0014]
The present invention also records a plurality of sequences of video and audio as a plurality of interleaved units of continuous data of any size, and records the plurality of interleaved units so that they are continuously played back without interruption. An optical disk, a disk reading means for reading information from the optical disk, an information storage means for storing information read from the optical disk, and a head address of each interleave unit buffered in the information storage means An address management means for performing, a playback time detecting means for calculating a time until each interleave unit start address managed by the address management means is output from the information storage means, and a request for changing a playback sequence designated by an operator. Receiving sequence change receiving means for receiving, and the information storing means And an address generating means for generating a write address to said information storage means when starting the writing of data read from the optical disk.
[0015]
With this configuration, when a plurality of interleave units are stored in the information storage means, there is a playback sequence change request such as an angle switching request, and when the playback sequence change acceptance means receives the playback sequence change request, The time detecting means detects (or calculates) the time until the corresponding address is reproduced from the plurality of interleave unit head addresses managed by the address managing means, and the address generating means detects the detected time from a certain time. An interleave unit head address that increases is generated, and reading of the recording data of the next angle is started from this address. All the information in the information storage means is reproduced until the reading of the next angle is completed. So that video and audio are not interrupted at high speed. It can be switched Le.
[0016]
The present invention also records a plurality of sequences of video and audio as a plurality of interleaved units of continuous data of any size, and records the plurality of interleaved units so that they are continuously played back without interruption. An optical disk, a disk reading means for reading information from the optical disk, an information storage means for storing information read from the optical disk, and a head address of each interleave unit buffered in the information storage means Address management means, a reproduction time detection means for calculating a time until each interleave unit head address managed by the address management means is output from the information storage means, and an access time to the head address of the next interleave unit. Access time calculation to calculate A reproduction sequence change accepting unit that accepts a reproduction sequence change request designated by the operator, and a write address to the information storage unit is generated when writing of the data read from the optical disk into the information storage unit is started. Address generating means.
[0017]
With this configuration, when a plurality of interleave units are stored in the information storage means, there is a playback sequence change request such as an angle switching request, and when the playback sequence change acceptance means receives the playback sequence change request, The time detection means detects (or calculates) the time from the start address (start address) of the plurality of interleave unit managed by the address management means until the corresponding address is reproduced, and the access time calculation means An interleave unit that calculates an access time to the head address of the unit, and in which the address generation means has a detection time output by the reproduction time detection means that is longer than an access time to the next interleave unit output by the access time calculation means Generate the start address. As a result, the reading of the recording data of the next angle is started from the address whose detection time output by the reproduction time detecting means is equal to or longer than the access time until the reading of the recording data of the next angle is started, and the next angle reading is completed. Since all the information stored in the information storage means is not reproduced until then, the angle can be switched at high speed without interruption of video and audio.
[0018]
The present invention also records a plurality of sequences of video and audio as a plurality of interleaved units of continuous data of any size, and records the plurality of interleaved units so that they are continuously played back without interruption. Optical disk, disk reading means for reading information from the optical disk, information storage means for storing information read from the optical disk, servo means for controlling rotation, focusing and tracking of the optical disk, and the servo means If the servo adjustment means for adjusting the servo characteristics and the area where the servo adjustment is unnecessary are reproduced by determining whether the servo adjustment is necessary, the size of the storage area in the information storage means is Servo adjustment state determining means for limiting.
[0019]
With this configuration, when the servo adjustment state determination unit has already reproduced an area that is determined not to require adjustment, the information stored in the information storage unit is limited so that even if an angle switch occurs, the information Since there is little information prefetched in the storage means, it is possible to shorten the time from the generation of the angle switching request until the video of the next angle is actually output.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
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.
[0021]
(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. 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.
[0022]
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.
[0023]
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.
[0024]
(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.
[0025]
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.
[0026]
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.
[0027]
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.
[0028]
(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 the plurality of interleave units are continuously reproduced without interruption during reproduction. 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.
[0029]
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.
[0030]
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.
[0031]
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.
[0032]
(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 head address of each interleave unit buffered in the information storage means 3, and reference numeral 14 denotes a time until each interleave unit head 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 the 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.
[0033]
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 of FIG. 14, the first recording area of angle 2 (c), the second recording area (sa) of angle 2, and the third recording area (se) of angle 2 are stored, and the decoding means The data sent to 4 is the information recorded in the (t) position, that is, in the first recording area of angle 2. The decoding unit 4 demodulates and outputs a video signal and an audio signal from the input data.
[0034]
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.
[0035]
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.
[0036]
(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.
[0037]
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.
[0038]
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 in the third recording area (angle) of angle 1 is re-stored next to the start address of the second recording area (...) of angle 2 so far.
[0039]
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.
[0040]
(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 at the time of 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.
[0041]
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.
[0042]
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.
[0043]
(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 servo adjustment is determined to be unnecessary is being reproduced, the servo adjustment state determination means for limiting the size of the storage area in the information storage means 3.
[0044]
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.
[0045]
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.
[0046]
(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.
[0047]
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.
[0048]
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.
[0049]
(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.
[0050]
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.
[0051]
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.
[0052]
(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 series of video and audio 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.
[0053]
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.
[0054]
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.
[0055]
【The invention's effect】
  As described above, according to the present invention, when a plurality of interleave units are stored in the information storage means, there is a request for changing the playback sequence such as an angle switching request, and the playback sequence change accepting means If the request is accepted,Data stored in the information storage means is restored so that the data in the information storage means becomes the fastest without any interruptions in the sound or pictures due to lack of access or adjustment. By doing so, high-speed and seamless angle switching playback can be realized.
[Brief description of the drawings]
FIG. 1 is a block diagram of an optical disc playback apparatus according to a first embodiment of the present invention.
FIG. 2 is a block diagram of an optical disc playback apparatus according to Embodiment 2 of the present invention.
FIG. 3 is a block diagram of an optical disk reproducing device according to a third embodiment of the present invention.
FIG. 4 is a block diagram of an optical disk reproducing device according to Embodiment 4 of the present invention.
FIG. 5 is a block diagram of an optical disc playback apparatus in a fifth embodiment of the present invention.
FIG. 6 is a block diagram of an optical disc playback apparatus in a sixth embodiment of the present invention.
FIG. 7 is a block diagram of an optical disk reproducing device according to a seventh embodiment of the present invention.
FIG. 8 is a block diagram of an optical disc playback apparatus in an eighth embodiment of the present invention.
FIG. 9 is a block diagram of an optical disk reproducing device according to a ninth embodiment of the present invention.
FIG. 10 is a block diagram of an optical disc playback apparatus in a tenth embodiment of the present invention.
FIG. 11 is a characteristic diagram of an optical disc focus offset value.
FIG. 12 is a characteristic diagram of radial tilt value of an optical disc.
FIG. 13 is a data structure diagram on a disk of a multi-angle part.
FIG. 14 is a data configuration diagram in the information storage means during multi-angle playback.
FIG. 15 is a data configuration diagram in the information storage means during multi-angle playback.
FIG. 16 is a data configuration diagram in the information storage means during multi-angle playback.
FIG. 17 is a data configuration diagram in the information storage means during multi-angle playback.
FIG. 18 is a data configuration diagram in the information storage means during multi-angle playback.
[Explanation of symbols]
1 Optical disc
2 Disc reading means
3 Information storage means
4 Decryption means
5 Servo means
6, 18, 19 Servo adjustment means
7, 7A, 7B, 7C, 20, 20A Servo adjustment starting means
8 Data volume 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
(H) The first recording area of angle 2
(K) First recording area of angle 3
(E) Second recording area of angle 1
(S) Second recording area of angle 2
(G) Second recording area of angle 3
(Su) Third recording area of angle 1
(C) Third recording area of angle 2
(So) Angle 3 third recording area
(T) 4th recording area of angle 1

Claims (2)

Multiple series of video and audio are recorded as an interleave unit that is a plurality of continuous data of any size, and during playback, the recorded optical disc is recorded so that the multiple interleave units can be played continuously without interruption. An optical disk reproducing apparatus for reading information from the optical disk, information storage means for storing information read from the optical disk, and a head of each interleave unit buffered in the information storage means Address management means for managing addresses, reproduction time detection means for calculating the time until each interleave unit start address managed by the address management means is output from the information storage means, and a reproduction sequence designated by the operator Replay sequence change acceptance means for accepting change requests , And an address generating means for generating a write address to said information storage means when starting the writing of data read from the optical disc to the information storage means,
If the playback sequence change receiving means has received the playback system change request, the playback time detecting means detects the time until the corresponding address is reproduced from a plurality of interleaved units start address managed by the address management means The address generating means generates an interleave unit head address whose detection time is longer than a predetermined time . Multiple series of video and audio are recorded as an interleave unit that is a plurality of continuous data of any size, and during playback, the recorded optical disc is recorded so that the multiple interleave units can be played continuously without interruption. An optical disk reproducing apparatus for reading information from the optical disk, information storage means for storing information read from the optical disk, and a head of each interleave unit buffered in the information storage means Address management means for managing addresses, reproduction time detection means for calculating the time until each interleave unit start address managed by the address management means is output from the information storage means, and up to the start address of the next interleave unit Calculate access time Writing into the information storage means when starting the access time calculating means, a reproduction sequence changing receiving means for receiving a playback system change request the operator to specify the writing of data read from the optical disk to the information storage means Address generating means for generating an address,
If the playback sequence change receiving means has received a request playback sequence changes, the playback time detecting means detects the time until the corresponding address is reproduced from a plurality of interleaved units start address managed by the address management means The access time calculating means calculates an access time up to the head address of the next interleave unit, and the address generating means outputs a detection time output from the reproduction time detection means to a next interleave unit output from the access time detection means. An optical disk reproducing apparatus characterized by generating an interleave unit head address that is longer than an access time of

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