WO2006001331A1 - 記録装置、記録方法、プログラム、集積回路 - Google Patents
記録装置、記録方法、プログラム、集積回路 Download PDFInfo
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- WO2006001331A1 WO2006001331A1 PCT/JP2005/011532 JP2005011532W WO2006001331A1 WO 2006001331 A1 WO2006001331 A1 WO 2006001331A1 JP 2005011532 W JP2005011532 W JP 2005011532W WO 2006001331 A1 WO2006001331 A1 WO 2006001331A1
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- WIPO (PCT)
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- recording
- time
- delay time
- time required
- stream data
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Classifications
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- 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
- G11B19/06—Control of operating function, e.g. switching from recording to reproducing by counting or timing of machine operations
-
- 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
Definitions
- the present invention belongs to the technical field of simultaneous recording technology.
- the simultaneous recording technique is a technique in which a recording apparatus is provided with a plurality of recording systems, and the same video is recorded simultaneously by the plurality of recording systems.
- One of these recording systems consists of an MPEG-2 encoder and a drive device such as a DVD.
- the input video is converted into an MPEG-2 video stream and written to a DVD or the like.
- Another recording system includes an MPEG-4 encoder and a memory card drive device, and converts the input video into an MPEG-4 format video stream and writes it to the memory card.
- Patent Document 1 is a prior art that performs simultaneous recording by preparing a plurality of encoders corresponding to individual compression methods.
- Patent Document 1 Japanese Patent Laid-Open No. 10-243348
- a video stream written on a memory card often has a different frame rate from a video stream written on a DVD or the like. This is because the specifications of the display that can be played differ between TV and mobile phone. That is, a video stream written on a DVD or the like has a frame rate of 29.94 ft) s (frames / second) for playback on a TV. On the other hand, the video stream written to the memory card is 15-20fts (frame / second) for playback on a QVGA type display on a mobile phone. Has a lame rate.
- the plurality of recording systems described above often differ in the standby period power for starting encoding, which is often different in the way the encoder is mounted on the apparatus.
- the MPEG-2 encoder is implemented in hardware and implemented as a LSI in a recording device, whereas it is implemented in MPEG-4 encoder software and implemented as a single program in the recording device. There may be.
- the Stanno periods for the two recording systems are completely different.
- the standby periods are completely different, there is a problem that it is difficult to make the first picture in the video stream the same.
- An object of the present invention is to provide a recording apparatus capable of aligning the first picture to be encoded in a plurality of recording systems even if the standby periods in the plurality of recording systems are different from each other. is there.
- a recording apparatus is a recording apparatus that records stream data using a plurality of recording systems, each using a different encoding scheme, and Measuring means for measuring a delay time required for a recording system to start recording after receiving a recording instruction alone, and a control means for instructing to start recording for a predetermined period before the recording system having a long delay time It is characterized by comprising.
- the delay time until the start of encoding is obtained in advance in a plurality of recording systems, and the encoding start time is shifted to the longer delay time. Can be aligned.
- FIG. 1 is a diagram showing an internal configuration of a recording apparatus according to a first embodiment.
- FIG. 2 is a flowchart showing a processing procedure for recording start control by a recording control unit.
- FIG. 3 is a flowchart showing a processing procedure of delay amount measurement processing by a delay amount measurement unit.
- FIG. 4 (a) A diagram schematically showing the relationship between the delay amount for each encoder section and the preceding instruction time.
- FIG. 4B is a diagram schematically illustrating a state in which recording start timings coincide with each other in two encoder units.
- FIG. 5 is a diagram showing an internal configuration of a recording apparatus according to a second embodiment.
- FIG. 6 is a flowchart showing a processing procedure of recording start control according to the second embodiment.
- FIG. 7 is a flowchart showing a processing procedure of delay amount measurement processing according to the second embodiment.
- FIG. 8 (a) is a diagram schematically showing the relationship between the delay amount and the preceding instruction time for each encoder unit according to the second embodiment.
- FIG. 6B is a diagram schematically illustrating a state in which the recording start timings coincide with each other in the two encoder units according to the second embodiment.
- the recording device records AV data on the recording media 101 and 102 by different encoding methods when a user operation on a remote controller or a button provided on the side of the device is received. It is.
- FIG. 1 is a diagram showing an internal configuration of the recording apparatus according to the first embodiment of the present invention.
- the recording apparatus includes a video Z audio input unit 201, a time information management unit 202, an encoder unit 203, an encoder unit 204, a writing unit 205, a writing unit 206, and a recording control unit 207.
- the video Z audio input unit 201 enables any video input among the camera, tuner, AV input terminal, 1394 terminal, and LAN terminal when the recording device mode is switched from the playback mode to the recording mode. It is checked whether it is present, and those determined to be valid are output to the encoder unit 203 and the encoder unit 204. This check checks whether pins are connected to the AV input terminal, 1394 terminal, and LAN terminal, and validates those that are connected. If there is nothing connected to the AV input terminal, 1394 terminal, or LAN terminal, the video input from the camera or tuner is enabled.
- the terminal is switched to the requested terminal or camera, and the video input is output to the encoder unit 203 and the encoder unit 204.
- the video input is output to the encoder unit 203 and the encoder unit 204.
- the time information management unit 202 is a time measuring means that holds the current time and returns the current time in response to an inquiry.
- e Protocol is implemented as software using a network protocol.
- the encoder unit 203 is an MPEG-2 encoder, which is implemented as hardware and mounted on a recording apparatus as an LSI. Since this hardware-encoded encoder unit 203 performs encoding, it is necessary to set the hardware constituting the encoder unit 203 in order to cause the encoder unit 203 to perform encoding. From the setting for this hardware to the notification of the completion of setting is the initialization process in the encoder unit 203. The time required from the start of recording to the completion of this initialization process is the amount of delay until the start of encoding. Become.
- the encoder unit 204 is an MPEG-4 encoder and is implemented as a software encoder.
- the MPEG-4 encoding program In order for the softwareized encoder to perform the encoding, the MPEG-4 encoding program must be loaded into memory and run as a task process by the operating system (OS) on the recording device! /, .
- OS operating system
- the encoder units 203 and 204 include delay amount measuring units 203a and 204a, respectively.
- the encoder units 203 and 204 measure the delay amount associated with the start or stop of recording, and send the response to the recording control unit 207.
- the writing unit 205 is a drive device that writes the AV data compressed by the encoder unit 203 using the MPEG-2 method onto the optical disc 101 that is a recording medium.
- the writing unit 206 is a drive device that writes the AV data compressed by the encoder unit 204 using the MPEG-4 method to the semiconductor memory card 102 that is a recording medium.
- the recording control unit 207 is a control unit that controls recording start and end of AV data in the recording apparatus according to the present embodiment.
- a recording start operation is performed by the user, a reservation start time set for reservation is set.
- recording start control is executed to switch the recording device mode from playback mode to recording mode, and end recording by the user
- recording end control is executed to switch the recording device mode from the recording mode to the reproduction mode.
- FIG. 2 is a flowchart showing a processing procedure of recording start control by the recording control unit 207.
- This flowchart is a processing procedure executed by the recording control unit 207 when a recording start operation is performed by the user.
- Step S11 is a processing procedure for notifying the encoder unit 203 of a "delay amount measurement command” and acquiring the delay amount D1 and the input switching time C1 as a return value from the encoder unit 203.
- Step S12 is a processing procedure for notifying the encoder unit 204 of a “delay amount measurement command” and acquiring the delay amount D2 and the input switching time C2 as return values from the encoder unit 204.
- “preceding instruction time” is determined.
- the preceding instruction time is a time difference in which the recording start command is notified to the encoder units 203 and 204 in order to make the recording start timings in the encoder units 203 and 204 coincide. More specifically, when the delay amount D1 is smaller than the delay amount D2, the encoder unit 203 can start recording earlier than the encoder unit 204. For this reason, the encoder unit 203 and the encoder unit 204 may start recording simultaneously if a recording start instruction is given to the encoder unit 203 after an appropriate preceding instruction time has elapsed since the recording start instruction was given to the encoder unit 204. It becomes possible.
- step S13 it is determined whether or not the delay amount D1 is smaller than the delay amount D2.
- step S13: Yes the encoder unit 204 with a large delay amount is selected as the preceding instruction target, the delay amount D1 is subtracted from the delay amount D2, and the input switching time C1 The value obtained by adding is used as the preceding instruction time (step S14).
- FIG. 5 is a diagram schematically showing a method for calculating the preceding instruction time. As shown in the figure, as the preceding instruction time, a value obtained by calculating the input switching time on the side where the start of recording is instructed later is used as the difference between the delay amounts in the encoders 203 and 204.
- step S13 when the delay amount D2 is smaller (step S13: No), the encoder unit 203 having the larger delay amount is selected as the preceding instruction target, and the delay amount D2 is subtracted from the delay amount D1. The value obtained by adding the input / output switching time C2 is set as the preceding instruction time (step S15).
- step S16 a “recording start command” is issued to each of the encoder units 203 and 204.
- step S16 a “recording start command” is issued to the encoder unit 203 or 204 that is selected as the preceding instruction target in step S14 or step S15.
- the time information management unit 202 is requested to acquire the current time, and the current time is obtained (step S17).
- step S18 the preceding instruction time is added to the acquired current time to calculate the recording start time.
- step S 19 the time information management unit 202 is set to notify the arrival of the recording start time, and when the arrival of the recording start time is notified from the time information management unit 202, the preceding one of the encoder units 203 and 204 A “recording start command” is issued to the side not selected as the instruction target (step S20).
- step S17 to step S20 for example, when the delay amount of the encoder unit 204 is larger than that of the encoder unit 203, recording is started in the encoder unit 204 as shown in FIG. After the preceding instruction time (D2 ⁇ D1 + C1) has elapsed after the instruction is issued, the encoder unit 203 is instructed to start recording.
- the initialization process of the encoder unit 204 when the input unit 203 receives an instruction during the initialization process period, the stream data to be recorded is already recorded.
- the input switching process is not executed during the initialization process period.
- the timing for completing both initialization processes matches, and the input stream The same point of power encoding begins.
- the above is the process of recording start control by the recording control unit. This is the explanation.
- FIG. 2 is a flowchart showing a processing procedure of delay amount measurement processing by the delay amount measurement unit.
- This flowchart is executed by the delay amount measurement unit belonging to each encoder unit when a “delay amount measurement command” is notified from the recording control unit 207 to the encoder units 203 and 204. It is a processing procedure for calculating a switching time.
- the time information management unit 202 is requested to acquire the current time, and the acquired time tl is held as a return value (step S31).
- the input source of the stream to be recorded is specified in the “delay amount measurement command” received at this time.
- the video Z audio input unit 201 is inquired about which of the camera, tuner, AV input terminal, 1394 terminal, and LAN terminal is currently set as the stream data input source (step S32). As a result of the inquiry, if the current video input is different from the input to be recorded, the currently set video input is retained (step S33). After that, in order to change the video input to the input source of the stream specified by the “delay amount measurement command”, the “video input switching command with switching time measurement” is issued to the video Z audio input unit 201 and the input is In addition to switching, the input switching time is acquired as a return value (step S34).
- Step S35 When the video input from the video Z audio input unit 201 is switched to the one specified by the “delay amount measurement command”, the digital input of the video data obtained from the video Z audio input unit 201 is started (STEP Step S35), the encoder section performs initialization processing until immediately before starting compression (Step S36).
- Step S37 When the processing up to this point is completed, the time information management unit 202 is requested to acquire the current time again, time t2 is acquired as a return value (step S37), and the difference between time t2 and time t1 is calculated.
- the delay amount is calculated (step S38).
- step S39 both the calculated delay amount and input switching time are returned to the recording control unit 207.
- a “video input switching command” is commanded to the video Z audio input unit 201 (step S40).
- the video Z audio input unit 201 that has received the “video input switching command with switching time measurement” in step S34 first requests the time information management unit 202 to acquire the current time and obtains it as a return value. Hold time t3. It then switches the input from the current input to the requested stream input source. Immediately after the switching is completed, request the time information management unit 202 again to acquire the current time, take the difference between the time t4 and the time 3 acquired here, and use this value as the input switching time, the delay amount By replying to the measurement unit, the “video input switching command with switching time measurement” is completed.
- the preceding instruction time is calculated in consideration of the delay amounts and input switching times of the plurality of encoder units, and the preceding instruction time is advanced to the encoder unit having a large delay amount.
- FIG. 5 is a diagram showing an internal configuration of a recording apparatus according to the second embodiment of the present invention.
- the recording apparatus according to the second embodiment has a configuration in which the writing units 205 and 206 shown in FIG.
- the same components as those shown in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted.
- the writing unit 208 writes the AV data compressed by the encoder unit 203 using the MPEG-2 method and the AV data compressed using the MPEG-4 method by the encoder unit 204 to the recording medium 103 that is a hard disk. It is a hard disk drive (HDD).
- HDD hard disk drive
- processing to set an initial value in the register so that the hardware of the writing device can operate and processing to wait for the completion notification are required.
- FIG. 6 is a flowchart showing a processing procedure of recording start control by the recording control unit 207 according to the second embodiment.
- this flowchart shows the return values obtained from the encoders 203 and 204 in step S51 and step S52, and steps S54 and S55.
- the method of calculating the “preceding instruction time” in the process is different.
- step S51 and step S52 the transition time is notified from the encoder units 203 and 204 in addition to the delay amount and the input switching time in response to the delay amount measurement command.
- step S54 the encoder unit 204 having a large delay amount is selected as the preceding instruction target, the delay amount D1 is subtracted from the delay amount D2, and the value obtained by adding the input switching time C1 and the transition time T1 is the preceding instruction time.
- step S54 the encoder unit 203 having a large delay amount is selected as the preceding instruction target, the delay amount D2 is subtracted from the delay amount D1, and a value obtained by adding the input switching time C2 and the transition time T2 is obtained.
- the preceding instruction time is selected as the preceding instruction target, the delay amount D2 is subtracted from the delay amount D1, and a value obtained by adding the input switching time C2 and the transition time T2 is obtained.
- FIG. 8 is a diagram schematically showing a method for calculating the preceding instruction time according to the second embodiment.
- the delay in encoder units 203 and 204 Use the value obtained by adding the input switching time and transition time on the side where recording starts to be instructed later, to the difference in amount.
- the transition time T1 is included in a part of the preceding instruction time in the second embodiment, as in the input / output switching process, the transition process is also performed with the encoder unit 203. This is a common process with the encoder unit 204, and if executed by the encoder unit 204 to which a recording start command is notified in advance, the encoder unit 203 need not execute it.
- step S57 to step S60 for example, when the delay amount of the encoder unit 204 is larger than that of the encoder unit 203, (b) in FIG. As shown in FIG. 8, after the instruction start time (D2 ⁇ D1 + C1 + T1) has elapsed after the encoder unit 204 is instructed to start recording, the encoder unit 203 is instructed to start recording.
- the force for executing the input switching process and the transition process during the initialization process period is shown in the first stage.
- the input switching process and the migration process are not executed during the initialization process period.
- the timing for completing both initialization processes coincides, and the encoding of the same point of the input stream is started.
- FIG. 7 is a flowchart showing a processing procedure of delay amount measurement processing of the delay amount measurement unit according to the second embodiment. This flowchart is a processing procedure executed when a “delay amount measurement command” is received from the recording control unit 207. The processing procedure of steps S75 to S77 is added to the processing procedure shown in FIG. .
- step S75 the writing unit 208 is asked what the current drive state is, and whether or not the current state of the writing unit 208 is a recordable state. This is a process for determining whether or not.
- step S76 and step S77 if the result of determination in step S75 is that the current state of the writing unit 208 is not recordable (step S75: No), In S76, the current state of the writing unit 208 is retained, and in step S77, the data is written to the recording medium 103, so that the data is written to the writing unit 208. Issue a “recordable state transition command with time measurement function” to shift to the recordable state and acquire the transition time as a return value.
- step S83 the "video input switching command” is commanded to the video Z audio input unit 201, and the state of the writing unit 208 is switched to the previously held drive state.
- the writing unit 208 that has received the “recordable state transition command with transition time measurement function” in step S77 first requests the time information management unit 202 to acquire the current time, and obtains the time obtained as a return value. Hold t5. Next, the transition process from the current drive state to the recordable state is executed. Immediately after the transfer is completed, the time information management unit 202 is requested again to acquire the current time, the difference between the acquired time t6 and time t5 is taken, and this value is used as the transfer time to measure the delay amount. To complete the “Recordable state transition command with transition time measurement function”.
- the preceding instruction time can be calculated in consideration of the transition time which is not only the input switching time.
- a recording apparatus having a configuration in which a writing unit is shared by a plurality of recording systems can match the recording start points when simultaneously performing digital recording on the stream data using a plurality of different compression methods. It becomes possible to
- the present invention may be a recording method disclosed by the processing procedure of the flowchart described in each embodiment. Also, it may be a program that realizes these methods by a computer, or it may be a digital signal that also has the program power! /.
- the present invention provides a computer-readable program or the digital signal. It may be recorded on a flexible recording medium such as a flexible disk, hard disk, CD-ROM, MO, DVD, DVD-ROM, DVD-RAM, BD (Blu-ray Disc), or semiconductor memory.
- a flexible recording medium such as a flexible disk, hard disk, CD-ROM, MO, DVD, DVD-ROM, DVD-RAM, BD (Blu-ray Disc), or semiconductor memory.
- the program or the digital signal may be transmitted via an electric communication line, a wireless or wired communication line, a network represented by the Internet, or the like.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. You can use an FPGA (Field Programmable Gate Array) that can be programmed after manufacturing the LSI or a reconfigurable processor that can reconfigure the connection and settings of the circuit cells inside the LSI.
- FPGA Field Programmable Gate Array
- the preceding instruction time is calculated every time the stream data is recorded.
- the preceding instruction time may be calculated only once when the recording apparatus is activated.
- step S11 to step S15 shown in FIG. 2 the processing procedure from step S11 to step S15 shown in FIG. 2 is executed when the apparatus is started, the calculated prior instruction time is retained, and the recording start control is performed. This can be realized by executing the process of the transition to step S17 using the stored preceding instruction time.
- the preceding instruction time may be calculated and recorded in advance in a nonvolatile memory such as EEPROM (Electrically Erasable Programmable ROM) at the time of manufacturing the recording apparatus.
- EEPROM Electrical Erasable Programmable ROM
- the present invention can be applied as stream data to be recorded, regardless of whether the data is video data, audio data, or both.
- the power using an optical disk, a semiconductor memory card, and a hard disk as a recording medium.
- the characteristics of the recording apparatus according to the present invention are not dependent on the physical characteristics of these recording media.
- the recording apparatus according to the invention may use any recording medium as long as it can record stream data.
- optical disks such as BD-ROM, CD-R, CD-RW, magneto-optical desks such as PD, MO, SD memory card, CompactFlash card, smart media, memory stick, multimedia power card
- PD CompactFlash card
- MO Secure Digital
- SD memory card CompactFlash card
- smart media memory stick
- multimedia power card It may be a semiconductor memory card such as a PCM-CIA card, a flexible disk, a magnetic recording disk such as SuperDisk, Zip, or Clik !, or a removable hard disk drive such as an ORB, Jaz, SparQ, Syjet, EZFley, or a microdrive.
- the present invention is useful for AV equipment having a function of simultaneously starting and stopping the same point force recording of the same video in a plurality of different compression formats when recording stream data.
- a digital video that starts and ends recording by user button operation.
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JP2004187703A JP2007274015A (ja) | 2004-06-25 | 2004-06-25 | ストリーム記録装置 |
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Cited By (1)
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US9264999B2 (en) | 2009-08-19 | 2016-02-16 | Google Technology Holdings LLC | System and method for mitigating the effects of interferers while performing conditional device scan |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0574110A (ja) * | 1991-09-12 | 1993-03-26 | Sony Corp | デイジタルvtr |
JPH06253331A (ja) * | 1993-03-01 | 1994-09-09 | Toshiba Corp | 可変長符号化信号に対応した編集装置 |
JPH0974540A (ja) * | 1995-09-06 | 1997-03-18 | Nippon Telegr & Teleph Corp <Ntt> | リアルタイム早送り再生用動画像符号化情報作成装置 |
JP2003333501A (ja) * | 2002-05-17 | 2003-11-21 | Matsushita Electric Ind Co Ltd | ディスク記録再生装置 |
-
2004
- 2004-06-25 JP JP2004187703A patent/JP2007274015A/ja active Pending
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2005
- 2005-06-23 WO PCT/JP2005/011532 patent/WO2006001331A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0574110A (ja) * | 1991-09-12 | 1993-03-26 | Sony Corp | デイジタルvtr |
JPH06253331A (ja) * | 1993-03-01 | 1994-09-09 | Toshiba Corp | 可変長符号化信号に対応した編集装置 |
JPH0974540A (ja) * | 1995-09-06 | 1997-03-18 | Nippon Telegr & Teleph Corp <Ntt> | リアルタイム早送り再生用動画像符号化情報作成装置 |
JP2003333501A (ja) * | 2002-05-17 | 2003-11-21 | Matsushita Electric Ind Co Ltd | ディスク記録再生装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US9264999B2 (en) | 2009-08-19 | 2016-02-16 | Google Technology Holdings LLC | System and method for mitigating the effects of interferers while performing conditional device scan |
US9674689B2 (en) | 2009-08-19 | 2017-06-06 | Google Technology Holdings, LLC | System and method for mitigating the effects of interferers while performing conditional device scan |
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