WO2006011318A1 - デジタルデータの記録装置および記録方法 - Google Patents
デジタルデータの記録装置および記録方法 Download PDFInfo
- Publication number
- WO2006011318A1 WO2006011318A1 PCT/JP2005/011254 JP2005011254W WO2006011318A1 WO 2006011318 A1 WO2006011318 A1 WO 2006011318A1 JP 2005011254 W JP2005011254 W JP 2005011254W WO 2006011318 A1 WO2006011318 A1 WO 2006011318A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- digital data
- unit period
- data
- buffer memory
- recorded
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
- G11B2020/1062—Data buffering arrangements, e.g. recording or playback buffers
Definitions
- the present invention relates to a digital data recording apparatus and recording method.
- a mini-disc used for recording and playback of digital audio data, one cluster is formed for each predetermined amount of digital data, and one cluster is recorded on the disc. It is a unit.
- FIG. 3 is a diagram for explaining a signal processing method of such a system.
- a video signal and an audio signal are in MPEG2 (Motion Picture Experts Group Phase 2) system.
- Digital data (program stream) Encoded in DM.
- the data DM is sequentially written in the buffer memory as shown in FIG. 3B, and is read intermittently as data DR as shown in FIG. 3C.
- the data DR divides MPEG (Motion Picture Experts Group) data DM into unit periods TUNIT, and compresses the data for each unit period TUNIT at a constant speed by compressing the time axis every period TREC. This is a read signal.
- the unit period TUNIT is an arbitrary length of 10 to 20 seconds. The length of the unit period TUNIT may be changed during one recording, but in general, the unit period TUNIT is at least one recording period to avoid complicated system and control. Then it is fixed.
- the period TREC is a period in which the read data #n is recorded on the disc, and the length of the force period TREC in which the force described later becomes obvious is not constant. Furthermore, the period between one period TREC and the next period TREC is the seek period of the recording head or the recording pause period.
- the recording DR is performed on the data DR read from the nota memory, and the data DR subjected to this modulation processing is the data # 1, # 2, # 3, ... They are recorded on the disc in order.
- the MPEG data DM has a variable bit rate and the length of the unit period TUNIT is constant, the data amount (data size) of data #n included in the unit period TUNIT is equal to that of the period TUNIT. It changes according to the contents of video and audio.
- the bit rate of the data DR is constant, so the length of the recording period TREC is the data in that period TREC. It changes according to the contents of DR. Also, the size of the recording area corresponding to one recording period TREC changes corresponding to the contents of data #n in that period TREC.
- FIG. 4A shows how the data amount (data remaining amount) DBUF of the buffer memory shown in FIG. 3 changes
- FIG. 4B shows the state of recording on the disc. It should be noted that if a bad sector is generated on the disk, or recording or erasure is repeated, and an old recording section is fragmented, an area that cannot be used for recording is generated. Indicates an area that cannot be used. An area without a code or symbol is a recordable area.
- the size of the area necessary to record the data # 2 is determined from the data amount of the next data # 2 in the buffer memory.
- the recording head is sought to the recordable area that satisfies the calculated area size.
- the processing power similar to the processing in the period tl to t2 to t3 is repeated in the period t3 to t4 to t5, and the data # 2 is recorded on the disc, and further, in the period t5 to t6 to t7. Is repeated and data # 3 is recorded on the disc.
- data DR that is, MPEG data DM
- MPEG data DM is one continuous area every TUNIT minutes. The disc will be recorded.
- the period TREC for recording on the disk becomes intermittent, and the drive of the disk is stopped during the periods t0 to tl, t8 to t9, and the like. Therefore, the average power consumption required for the disk drive can be reduced, and a recording device using a battery as a power source, for example, a video camera-integrated recorder, can increase the shooting and recording time.
- MPEG data DM is stored in the nota memory for one unit period TUNIT or more, so the data amount of data # 1 is detected and data # 1 is recorded as described above. It is only necessary to calculate the size of the area necessary for this, and then seek the recording head to a recordable area that satisfies the calculated area size. The same is true at time points t4, t6, tlO, and the like.
- the buffer memory data amount DBU F at time t6 may be approximately equal to the maximum data amount in one unit period TUNIT in some cases.
- the amount of data DBUF changes from the value close to the maximum value of the data amount in one unit period TUNIT to the upper limit value DLIM. I'll end up.
- the present invention is intended to solve the above problems.
- this invention is intended to solve the above problems.
- a buffer memory in which digital data of a variable bit rate is written and the written digital data is intermittently read;
- a recording head for recording the digital data read from the buffer memory on a disc
- a control circuit for controlling the recording position when the digital data read from the buffer memory is recorded on the disc
- the recording head seeks to a recordable area where the read digital data can be recorded as a continuous area
- the read digital data is recorded as a continuous area for each unit period in the seek destination recordable area
- the amount of digital data in the unit period including the digital data that is less than the unit period is predicted.
- the above recording head is sought in a recordable area where digital data of the predicted data amount can be continuously recorded
- the recording head seeks to a recordable area where the read digital data can be recorded as a continuous area
- the read digital data is recorded as a continuous area for each unit period
- This estimated data volume DPRE seeks the recording head to a recordable area where digital data can be recorded continuously
- the remaining digital data of the unit period including the digital data less than the unit period is recorded.
- the digital data recording method is as described above.
- the unit period such as data # 4
- the unit corresponding to the data amount is taken into consideration.
- the amount of data in the period is predicted, and the recording head is sought to the required recordable area based on the prediction result, so the disk can be used effectively.
- the initial force recordable area is used effectively, the number of seeks during recording decreases, and as a result, the number of seeks during playback also decreases. Can be lengthened. In addition, the entire capacity of the noffer memory can be used effectively.
- FIG. 1 is a system diagram showing an embodiment of the present invention.
- FIG. 2 is a flowchart showing one embodiment of the present invention.
- FIG. 3 is a diagram for explaining the present invention.
- FIG. 4 is a diagram for explaining the present invention.
- FIG. 5 is a diagram for explaining the present invention.
- FIG. 1 shows an example of a recording apparatus according to the present invention.
- the digital video signal and the digital audio signal are supplied to the video encoder 12V and the audio coder 12A through the input terminals 1 IV and 11A, and are encoded into digital data (elementary stream) in, for example, the MPEG-2 system.
- the encoded output is supplied to the multiplexer 13 and multiplexed into one MPEG2 digital data (program stream) DM. From the multiplexer 13, for example, as shown in FIG. 3A, MP EG data DM continues. To be taken out.
- this MPEG data DM power for example, as shown in FIG.
- the data DR is sequentially written and read as data DR in sequence, and the read data DR is supplied to the modulation circuit 15 to be modulated for recording to be a recording signal.
- this recording signal is supplied to the recording head 16 and recorded on, for example, the disk 19 as shown in FIG. 4B.
- a drive control unit 17 is provided, and a system controller 18 configured by a microphone computer is provided. Then, the recording position of the recording head 16 with respect to the disk 19 is controlled by the system controller 18 through the drive control unit 17.
- the system controller 18 also has a memory controller function, and the system controller 18 controls the writing of data DM and the reading of data DR in the buffer memory 14.
- the multiplexer 13 and the modulation circuit 15 are also controlled by the system controller 18 corresponding to the data DM and DR. Further, the recordable area of the disk 19 and the area that cannot be used for recording are grasped and managed by the system controller 18 and recorded on the disk 19 when the management information changes.
- the digital video signal and the digital audio signal are recorded on the disc 19.
- the system controller 18 is provided with a recording routine 100 shown in FIG. 2, for example, as part of a program executed by the microcomputer constituting the system controller 18.
- This recording routine 100 is executed for every recording of data #n, and even when the data amount DBUF of the notifier memory 14 is less than TUNIT for one unit period as shown at time t6, even when seeking to the appropriate recordable area is realized. Is done.
- step 102 it is determined whether or not the data amount DBUF in the buffer memory 14 is equal to or more than one unit period TUNIT.
- step 102 when the data amount DBUF in the buffer memory 14 is equal to or more than one unit period T UNIT as at time t2, t4, etc., the process proceeds from step 102 to step 103, and in this step 103! /, The data of 14 of the memory memory 14 Data for the first one unit period TUNIT of DM # Data amount of n is calculated.
- step 104 based on the management information of the disk 19 managed by the system controller 18, the data amount n #n calculated in step 103 can be recorded continuously.
- the area is searched and then in step 105 the recording head 16 is sought to the recordable area searched in step 104.
- step 106 data #n whose data amount is calculated in step 103 is recorded as a continuous area in the recordable area sought in step 105. Thereafter, routine 100 is ended in step 107. To do. Note that the end time is time t2, t4, or the like.
- data # 1, # 2, and # 3 are recorded on the disc 19 so that each becomes one continuous area.
- step 102 as shown at time t6, the data amount DBUF force in the buffer memory 14 is less than the unit period TUNIT! /
- step 111 Data amount DBUF of data DM remaining in buffer memory 14 is calculated.
- step 112 in the case of FIG. 4, the data amount of data # 4 is predicted by the equation (1). That is, the data amount DPRE of the unit period TUNIT to which the data #n remaining in the nother memory 14 belongs is predicted according to the equation (1).
- DPRE DBUF + (TUNIT -TBUF) ⁇ ⁇ ⁇ ' ⁇ (1)
- DBUF The amount of data remaining in the notch memory 14! /
- TUNIT length of one unit period (any of 10 to 20 seconds)
- the data amount DBUF can also determine, for example, the difference between the write address and the read address for the notch memory 14.
- the playback time TBUF can be obtained from the stream of data stored in the buffer memory 14, and for example, the number of frames may be counted by detecting a picture header in the stream. 1 unit period
- the length TUNIT and the maximum bit rate BMAX are values given in advance to the system controller 18.
- step 104 a recordable area in which data of the data amount DPRE predicted by step 112 can be continuously recorded is searched.
- step 105 the recording head 16
- the data is sought in the recordable area searched by 104.
- step 106 the data remaining in the nother memory 14, in this case, the front part # 4A of data # 4 is recorded in the recordable area sought in step 105, and then the remaining data is recorded.
- Part # 4B force ⁇ recorded continuously as one region, step 1
- data # 4 force is recorded on the disk 19 so as to be one continuous area.
- the routine 100 Since the routine 100 is executed for each data #n, the data DR, that is, the MPE G data DM is recorded on the disc 19 as shown in FIG. 4, for example. At the time of this recording, the management information of the area recorded on the disk 19 is updated by the system controller 18 corresponding to the processing of the routine 100!
- MPEG data DM can be recorded on the disk 19.
- reproduction can be realized by a process complementary to the above-described recording. That is, according to the management information recorded on the disc 19, the recorded signal is intermittently reproduced from the disc 19 in the order of data #n, and the reproduced recording signal force data DR is demodulated and stored in the buffer memory. Write in order, and the written data DR can be read continuously as MPEG data DM.
- MPEG data DM can be recorded on the disk 19.
- data # 4 can be recorded.
- the data amount DPRE is predicted according to the equation (1), so the disk 19 should be used effectively. Can do.
- the predicted size (size) of the area necessary for recording data # 4 is also less than or equal to the predicted value in the case of the method shown in FIG. 5, so that data # 4 can be recorded in FIG. 5B, for example.
- the probability of recording in the area ABLK_A increases. In other words, the method shown in FIG. 5 is not used, and the probability of recording data DR for one unit period TUNIT in the recordable area increases. As a result, since recording is performed effectively even in a short recordable area, the disk 19 can be used effectively.
- the entire capacity of the buffer memory 14 can be used effectively. Even if the data DR bit rate is high and the capacity of the buffer memory 14 is small, even if the data DM for one unit period TUNIT does not fit into the buffer memory 14, the entire capacity of the buffer memory 14 Can be used effectively.
- the disc 19 can be an optical disc such as a DVD-R (DVD Recordable) or a Blu-ray disc, or a magneto-optical disc such as a MO (Magneto-Optical disc).
- the present invention can be used regardless of the content of the data to be recorded, the format of the signal, the type of disc, the method of managing data on the disc, etc. Can be applied.
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- Multimedia (AREA)
- Signal Processing (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Management Or Editing Of Information On Record Carriers (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/658,308 US20090052286A1 (en) | 2004-07-27 | 2005-06-20 | Apparatus and method for recording digital data |
EP05751317A EP1775725A1 (en) | 2004-07-27 | 2005-06-20 | Digital data recording device and recording method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004218064A JP2006040382A (ja) | 2004-07-27 | 2004-07-27 | デジタルデータの記録装置および記録方法 |
JP2004-218064 | 2004-07-27 |
Publications (1)
Publication Number | Publication Date |
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WO2006011318A1 true WO2006011318A1 (ja) | 2006-02-02 |
Family
ID=35786070
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/011254 WO2006011318A1 (ja) | 2004-07-27 | 2005-06-20 | デジタルデータの記録装置および記録方法 |
Country Status (6)
Country | Link |
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US (1) | US20090052286A1 (ja) |
EP (1) | EP1775725A1 (ja) |
JP (1) | JP2006040382A (ja) |
CN (1) | CN1989562A (ja) |
TW (1) | TW200614161A (ja) |
WO (1) | WO2006011318A1 (ja) |
Families Citing this family (2)
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TWI447728B (zh) * | 2011-03-03 | 2014-08-01 | Mstar Semiconductor Inc | 動態隨機存取記憶體之控制方法及控制器 |
CN102682835B (zh) * | 2011-03-11 | 2015-05-13 | 晨星软件研发(深圳)有限公司 | 动态随机存取存储器的控制方法及控制器 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001043631A (ja) * | 1999-07-29 | 2001-02-16 | Sharp Corp | データ記録方法及びデータ記録装置 |
JP2004199789A (ja) * | 2002-12-18 | 2004-07-15 | Sharp Corp | 記録装置のデータ記録方法、記録装置、データ記録プログラム、および該プログラムを記録した記録媒体 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3353382B2 (ja) * | 1993-04-23 | 2002-12-03 | ソニー株式会社 | 記録又は再生装置、及びメモリ制御装置 |
JP3467832B2 (ja) * | 1994-04-20 | 2003-11-17 | ソニー株式会社 | 記録方法及び記録装置 |
JP4110593B2 (ja) * | 1997-05-19 | 2008-07-02 | ソニー株式会社 | 信号記録方法及び信号記録装置 |
US6219311B1 (en) * | 1997-09-05 | 2001-04-17 | Sony Corporation | Disc recording method and device, and disc like recording medium |
-
2004
- 2004-07-27 JP JP2004218064A patent/JP2006040382A/ja not_active Abandoned
-
2005
- 2005-06-10 TW TW094119299A patent/TW200614161A/zh unknown
- 2005-06-20 EP EP05751317A patent/EP1775725A1/en not_active Withdrawn
- 2005-06-20 CN CNA200580025324XA patent/CN1989562A/zh active Pending
- 2005-06-20 WO PCT/JP2005/011254 patent/WO2006011318A1/ja active Application Filing
- 2005-06-20 US US11/658,308 patent/US20090052286A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001043631A (ja) * | 1999-07-29 | 2001-02-16 | Sharp Corp | データ記録方法及びデータ記録装置 |
JP2004199789A (ja) * | 2002-12-18 | 2004-07-15 | Sharp Corp | 記録装置のデータ記録方法、記録装置、データ記録プログラム、および該プログラムを記録した記録媒体 |
Also Published As
Publication number | Publication date |
---|---|
US20090052286A1 (en) | 2009-02-26 |
TW200614161A (en) | 2006-05-01 |
CN1989562A (zh) | 2007-06-27 |
EP1775725A1 (en) | 2007-04-18 |
JP2006040382A (ja) | 2006-02-09 |
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