WO2015064306A1 - Recording medium, play device, and play method - Google Patents

Abstract

An objective of the present invention is, in playing an optical disc, to allow a high-quality video signal to be played at a high transfer rate even with a low disc RPM. To this end, buffering is carried out with a hard disk drive and the locations where buffering is carried out are limited so as to limit the waiting time of a user. Provided is a recording method for recording digital information on an information recording medium, wherein inputted streams are configured in units of clips, said method comprising: a detection process for detecting a maximum transfer rate of an inputted clip; a segmenting process for segmenting the clip if the maximum transfer rate of the clip detected by the detection process exceeds a pre-determined value (X), said clip being segmented such that the size of the clip that will include the portion where X is exceeded will be less than or equal to a predetermined size; and a process for adding information relating to the maximum transfer rate of a clip resulting from the segmenting process to the management information for that clip.

Description

Recording method, reproducing apparatus and reproducing method

The present invention relates to a recording method on an information recording medium, a reproducing apparatus and a reproducing method for reproducing information from the information recording medium.

As background art of the present invention, for example, there are Patent Document 1 and Non-Patent Document 1. Patent Document 1 states that, for example, in an information recording / reproducing apparatus equipped with a large-capacity storage device such as a hard disk, library construction on the hard disk is performed at high speed, and program information recorded on the hard disk is reproduced during high-speed recording. Allow it to improve convenience. " Non-Patent Document 1 describes a Blu-ray disc.

JP 2002-269911 A

Blu-ray Disc reader, Ohm company edition (11 pages)

Conventionally, as described in Non-Patent Document 1, an HD video signal is recorded by a CLV (constant linear velocity) method in a Blu-ray disc that is an optical disc developed from a DVD. In addition, a technique for reproducing an optical disc recorded in this manner by the CAV (constant rotation speed) method is widely used. In this case, the reproduction rate increases in accordance with the radius from the inner periphery toward the outer periphery. In such a system, if the video signal is made to correspond to a signal improved to 4K2K resolution, it is necessary to increase the rotation speed of the optical disc in accordance with an increase in the transfer rate of the video signal. In order to increase the rotational speed, there are problems such as noise, a compact device that does not reach a desired rotational speed due to insufficient torque of the motor, and an increase in the time required to reach the desired rotational speed. Patent Document 1 describes a technique for recording data on an HDD (hard disk drive) and then reproducing the data. However, it takes a long time to record data on the optical disk on the HDD.

For example, the above problem is a detection process that detects the maximum transfer rate of the input clip, and if the maximum transfer rate of the clip detected by the detection process exceeds a predetermined value X, the part that exceeds X A division process for dividing the clip including the clip into a predetermined size or less, and a process for adding information on the maximum transfer rate for each clip to the management information corresponding to the clip after the division process. It will be solved.

According to the present invention, it is possible to realize an apparatus capable of reproducing a high-quality signal with low noise under a condition that the waiting time of the user is small.

Block diagram showing an embodiment of an optical disk reproducing apparatus Flowchart showing a recording method according to a disc format which is an embodiment of an optical disc Illustration of playback transfer rate of optical disc Disc format diagram as an example of an optical disc Explanatory drawing showing the recording format of the optical disc Explanatory drawing which shows the disk format which is an Example of an optical disk Flowchart showing an embodiment of an optical disk reproducing method Block diagram showing an embodiment of an optical disk recording apparatus

Hereinafter, examples of the present invention will be described.

An embodiment of the recording apparatus according to this embodiment will be described with reference to FIG. FIG. 8 is a block diagram of the recording apparatus according to this embodiment. A stream to be recorded is input from an input terminal 801. The stream is input to the demultiplexer 802. The demultiplexer 802 extracts encoded video data, encoded audio data, and various data from the input stream, and inputs these data to the high-speed clip detection unit 803.

As described later, the high-speed clip detection unit 803 reads the maximum transfer rate of the input stream, detects the presence or absence of a portion with a predetermined transfer rate X (Mbps) or more, and if there is a portion with X (Mbps) or more. For example, the stream part including the part is divided so that the stream size is Y or less, and the part of the stream smaller than X (Mbps) is not divided so as to be Y or less. To be configured.

The recording control unit 804 controls the recording unit 806 to record on the optical disc 807 in units of clips composed of the divided AV stream itself and management information. The division may be performed by the recording control unit 804. Note that the memory 805 is a storage unit for storing control information and the like.

FIG. 2 is a flowchart showing an optical disc recording method according to the data configuration method of the reproducing optical disc according to the present embodiment.

Fig. 3 shows the position of the pickup on the radius of the optical disk and playback when the CAV (constant rotation speed) playback is performed from the disk recorded by CLV (constant linear velocity recording) such as Blu-ray Disc (registered trademark). It is a figure which shows the transfer rate of the signal to be performed.

FIG. 4 is a diagram showing a recording format of the AV signal recorded on the optical disc. FIG. 5 is a diagram for explaining the relationship between the AV signal transfer rate and the recording format. FIG. 6 is a diagram for explaining the relationship between the AV signal transfer rate and the recording format in the optical disk recorded using FIG.

The optical disk recording method according to this embodiment will be described with reference to FIGS.

FIG. 5 shows that the transfer rate of the AV signal to be recorded is a variable transfer rate that varies with time depending on the characteristics of the input signal. In the present embodiment, such a variable transfer rate signal is recorded in units of clips composed of the AV stream itself and management information as shown in FIG. The management information added to the AV stream includes information related to the stream such as the maximum transfer rate, the average transfer rate, and address information of the optical disc on which the stream is recorded. If there are no particular restrictions on the units constituting the clip, it is possible to make one clip for the entire disc. FIG. 4 shows the case of Clip A as an example. Clips B, C, and D are similarly composed of an AV stream and management information. Furthermore, management information for the entire Clip on the Disc may exist. Address information may be stored in the management information for the whole.

FIG. 3 is a diagram showing the position on the radius of the optical disk of the pickup and the transfer rate of the reproduced signal when reproducing from the disk recorded by the CLV (constant linear velocity recording) method by the CAV (constant rotational velocity) method. In addition, since the playback rate is X (Mbps) on the innermost circumference, it indicates that all the data played back from the optical disc is higher than the playback rate X (Mbps).

On the other hand, if the transfer rate of the AV signal is X (Mbps) or more, there is a possibility that the playback rate is insufficient during playback. That means
(Playback rate)> (AV signal transfer rate)
Is not necessarily compensated.

The disc recording method will be described with reference to the flowchart of FIG. Reads the maximum transfer rate of the input stream (201), detects the presence or absence of a part with a predetermined transfer rate X (Mbps), and if there is a part greater than X (Mbps) (202 Yes), includes that part The stream part is divided (203) so that the stream size is Y or less, and the stream part smaller than X (Mbps) is not divided so as to be Y or less, so that the size is larger than Y. Configure. An AV file including a plurality of clips processed in this manner is output (204). Thus, when the AV signal transfer rate is high, the size of the clip is limited to a certain (Y) or less. When the process of FIG. 2 is performed on the AV signal shown in FIG. 5, data including a portion of X (Mbps) or more is divided into a size smaller than a certain size (ClipB, ClipC). In this way, the original clip is divided into four clips ClipA, ClipB, ClipC, and ClipD.

As described above, according to the present embodiment, an AV signal having a transfer rate compensated by the playback device, for example, X (Mbps) or more is recorded on the disc together with the management information in a form of being divided into units of a certain size or less. . When played back directly from a disc as in the conventional apparatus, the playback rate does not reach the rate required for playback of the AV stream, causing a drop in video. In addition, if the rotational speed is forcibly increased, the apparatus becomes larger and the noise increases. The idea of replaying the content after copying it to the temporary HDD will eliminate the concern, but there is a problem that the user cannot replay until all the copies are completed on the HDD. Therefore, select a part that is higher than the transfer rate X (Mbps) that cannot be compensated by the playback device, copy it to a higher speed and quieter device such as HDD, and transfer rate X (Mbps) after the copy of that part is finished It is possible to reproduce a portion that does not reach the size directly from the optical disc and a portion that is X (Mbps) or more from a copied destination such as an HDD. Accordingly, the amount of data that needs to be copied is limited in the process of temporarily copying and recording an AV signal of X (Mbps) or more on the HDD (FIG. 6, ClipC, ClipD). On the other hand, if there is no division processing, it is necessary to copy the entire Disc. Therefore, when the user performs reproduction, the user only has to wait for the end of the copy of the AV signal that is X (Mbps) or more (FIG. 6, Clipc, clipD), so the user's waiting time is greatly reduced.

Next, an embodiment of the reproducing apparatus according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram of a reproducing apparatus according to the present embodiment, in which 101 is a reproducing optical disk, 102 is a disk motor that rotates the reproducing optical disk 101, and 103 is a pickup that detects a reproduction signal from the reproducing optical disk 101. Reference numeral 104 denotes an analog front end unit that performs amplification, equivalent processing, and the like on the signal detected by the pickup 103.

105 is a demodulation processing unit that performs demodulation processing on the output of the analog front end unit 104 according to modulation processing during recording, and 107 is a DRAM that performs temporary recording of signals for reproduction signal processing.

106 is a memory controller (106) for controlling reading / writing of data between the DRAM reproduction signal processing blocks (105, 108, 109, 110) and the DRAM. The data demodulated by the demodulation processing unit 105 is temporarily recorded in the DRAM (107) via the memory controller (106) and then read out again to the ECC (108) via the memory controller (106). The data subjected to is stored in the DRAM (107).

Reference numeral 109 denotes a high-speed clip detection circuit, which is a reproduction rate that is compensated to be directly reproducible from the reproduction optical disk 101 based on information related to the maximum transfer rate in the AV signal management information shown in FIG. Detect clips that exceed.

110 is an AV decoder, which reads out reproduction data from the DRAM (107) and performs so-called back-end processing such as demultiplexing and decoding. The copyright processing circuit (111) performs processing necessary for reproduction on the copyright protection processing applied at the time of recording.

Clips detected by the high-speed clip detection circuit 109 to have a transfer rate X (Mbps) or more that cannot be compensated by the playback device are read from the AV decoder (110) and are transferred to the HDD (113) via the HDD recording / playback control circuit (112). To be recorded.

Reference numeral 114 denotes an output selection circuit. Based on information from the high-speed clip detection circuit 109, AV data of a clip detected as a transfer rate X (Mbps) or higher that cannot be compensated by the playback device is transferred to the HDD recording / playback control circuit (112). From the HDD (113), the AV data of the other clips is selected from the disc playback data from the AV decoder 110, and output from the output terminal 115 to an external display or speaker.

100 is a servo circuit that controls the pickup 103, the disk motor 102, and the like. Reference numeral 116 denotes a CPU that controls each block of the playback apparatus.

An embodiment of the reproduction method according to this embodiment will be described with reference to FIG. FIG. 7 is a flowchart of the reproducing method according to this embodiment. Hereinafter, it demonstrates along a flowchart.

The maximum transfer rate of each clip is detected from the management information of the data of the clip reproduced from the reproduction optical disk (701 and FIG. 4). It is determined whether or not the maximum transfer rate of each clip exceeds the playback transfer rate X compensated by the playback device (702), and if it exceeds (702-Yes), the excess clip is recorded on the optical disc based on the management information. The clip read from the optical disc is recorded after being subjected to HDD recording control processing (703) (704). HDD recording control processing refers to the entire signal processing for recording / reproducing to / from the HDD, and if necessary, processing for copyright protection may be performed. If the maximum transfer rate is not exceeded, (703, 704) is not executed. This process is repeated for the entire reproducing optical disk until the processing is completed (705).

After 705, the user can play the optical disc. It may be displayed to the user via the display device (not shown) that playback is possible at this timing, or all high-speed clips are grasped by the processing of 701, and the time until the end of 705 is displayed to the user. It is also effective to display the address.

When playback is possible, playback is performed based on a user instruction (706). It is determined whether the maximum transfer rate of the clip exceeds the playback transfer rate X compensated by the playback device (707). If it exceeds, playback from the HDD (708), if not, the signal from the playback optical disk Is reproduced (709). Steps (707, 708, 709) are repeated until the end of reproduction is determined (710). For example, in the case of Clip A to D in FIG. 6, Clip A and D are reproduced from the optical disk, Clip B and C are reproduced from the HDD, and these are connected and reproduced. As described above, according to the present embodiment, a portion having a transfer rate X (Mbps) or more that cannot be compensated by the playback device is selected from the management information and copied to a fast and quiet device using an HDD or the like. The part that does not reach the transfer rate X (Mbps) after the end is played from the disc, and the part that exceeds X (Mbps) is played from the copy destination such as HDD. In the process of once copying and recording an AV signal of X (Mbps) or more to the HDD, the amount of data that needs to be copied is limited based on the disc management information (Fig. 6, ClipC, DClipD), enabling user playback The waiting time to become can be reduced. Therefore, it is possible to realize a reproducing apparatus that is quiet and capable of reproducing high-quality video. This is particularly effective for thin-type devices for notebook PCs because of the limited motor torque.

In this embodiment, the built-in HDD (113) is used as a data copy destination for high-speed playback. However, a semiconductor such as a flash memory has characteristics such as higher speed and quietness than a playback optical disk. Different storage means such as a memory may be used, and the storage means may be provided externally (regardless of those connected locally or connected via a network). Even when the storage is provided outside, there is no problem by performing appropriate copyright protection processing in the HDD recording control circuit (112). Note that the copyright protection processing may be performed by the HDD recording control circuit (112) even when the HDD is incorporated.

Also, if the capacity of the HDD (113) is sufficient, the user can leave the data copied to the HDD at the time of the first playback so that the user can play the second playback after a limited waiting time at the first playback. It is possible to play without waiting time from time.

Also, when the user performs playback, the data library can be configured on the HDD by copying the entire Disc to the HDD while the processing and playback are not performed according to FIG. 7 described above. Also, in all the examples, whether or not the clip was divided was determined based on whether or not the fixed rate X (Mbps) or higher, but the playback rate corresponding to each radial position according to the maximum rotation speed of the device was fixed. A reference value may be used instead of rate X (Mbps).

Further, in this embodiment, the reference for limiting the size of the clip is based on the reproduction rate that can guarantee the innermost circumference, but the maximum transfer rate of the data is the reproduction rate for the radial position where the data is scheduled to be recorded. If the size is limited and division is performed when exceeding the limit, the amount of data that needs to be copied can be further reduced, so the waiting time of the user is limited.

Further, in this embodiment, the reference for limiting the size of the clip is based on the reproduction rate that can guarantee the innermost circumference, but the maximum transfer rate of the data is the reproduction rate for the radial position where the data is scheduled to be recorded. If the size is exceeded, the size is limited and division is performed, or the arrangement is changed on the outer peripheral side, so that the amount of data that needs to be copied can be further reduced, so that the waiting time of the user is limited.

In the management information, the maximum transfer rate of the stream in the clip and the data size of the stream are recorded. Further, as shown in FIG. 4, the management information can be easily controlled by hardening without being distributed for each clip.

Also, flag information indicating whether the maximum transfer rate exceeds a predetermined transfer rate may be added together with the maximum transfer rate or instead of the maximum transfer rate.

Also, the number of clips is not limited to the above.

In the above embodiment, description has been made using a reproduction optical disc, but the present invention can also be applied to a write once or rewritable optical disc.

DESCRIPTION OF SYMBOLS 101 ... Optical disk for reproduction | regeneration, 103 ... Pickup, 105 ... Demodulation circuit, 106 ... Memory controller, 108 ... ECC, 109 ... High-speed clip detection circuit, 110 ... AV decoder, 111 ... Copyright processing circuit, 112 ... HDD recording / playback control circuit, 113 ... HDD, 114 ... Output selection circuit

Claims (6)

A recording method for recording digital information on an information recording medium,
The input stream is composed of units called clips.
A detection process for detecting a maximum transfer rate of the input clip;
When the maximum transfer rate of the clip detected in the detection process exceeds a predetermined value X, a division process that divides the clip including a portion exceeding X to a predetermined size or less, and
Processing for adding information on the maximum transfer rate for each clip to the management information corresponding to the clip after the division processing;
A recording method comprising: The recording method according to claim 1,
A digital information recording method, wherein the predetermined value X is a reproduction rate that can be compensated by the reproducing apparatus. The recording method according to claim 2,
It is recorded on the information recording medium by a constant linear velocity method.
A recording method in which the playback rate that can be compensated for by the playback device is the innermost playback rate. A reproduction method for reproducing digital information recorded on a disc,
AV data is configured in units of clips, and when the maximum transfer rate of the AV data clip exceeds a predetermined value X, the clip size is recorded so as to be equal to or smaller than a predetermined size. Against the media
A process of recording a first clip including a portion in which the maximum transfer rate of the clip exceeds a predetermined value X in a storage;
When the first clip is played after the first clip is finished in the storage, a re-signal of the first clip is output from the storage, and a second clip not including the portion exceeding X is output. When reproducing, a process of outputting a re-signal of the first clip from the disc;
A playback method comprising: 5. The reproduction method according to claim 4, wherein the maximum transfer rate of the clip is determined based on management information added to the clip. A playback device for playing back digital information recorded on a disc,
AV data is configured in units of clips, and when the maximum transfer rate of the AV data clip exceeds a predetermined value X, the clip size is recorded so as to be equal to or smaller than a predetermined size. Against the media
Means for detecting whether the maximum transfer rate of the clip exceeds a predetermined value X;
According to the detection result of the maximum transfer rate detection means, high-speed storage means for recording once,
Means for selecting and outputting an output of the high-speed storage means or a reproduction signal from the disc according to a detection result of the maximum transfer rate detection means;
A playback apparatus comprising:

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