Classifications

• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
  • G11B27/005—Reproducing at a different information rate from the information rate of recording
• • 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
  • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
  • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
  • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
  • G11B27/034—Electronic editing of digitised analogue information signals, e.g. audio or video signals on discs
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
  • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
  • G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
  • G11B27/105—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating discs
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
  • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
  • G11B27/11—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
  • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
  • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
  • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
  • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
  • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
  • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
  • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
  • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
  • G11B27/32—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier
  • G11B27/327—Table of contents
  • G11B27/329—Table of contents on a disc [VTOC]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N5/00—Details of television systems
  • H04N5/76—Television signal recording
  • H04N5/78—Television signal recording using magnetic recording
  • H04N5/782—Television signal recording using magnetic recording on tape
  • H04N5/783—Adaptations for reproducing at a rate different from the recording rate
• • 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
  • G11B2020/10935—Digital recording or reproducing wherein a time constraint must be met
  • G11B2020/10944—Real-time recording or reproducing, e.g. for ensuring seamless playback of AV data
• • 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
  • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
  • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
  • G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
  • G11B2020/1285—Status of the record carrier, e.g. space bit maps, flags indicating a formatting status or a write permission
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B2220/00—Record carriers by type
  • G11B2220/20—Disc-shaped record carriers
  • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
  • G11B2220/215—Recordable discs
  • G11B2220/216—Rewritable discs
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B2220/00—Record carriers by type
  • G11B2220/20—Disc-shaped record carriers
  • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
  • G11B2220/2537—Optical discs
  • G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B2220/00—Record carriers by type
  • G11B2220/60—Solid state media
  • G11B2220/65—Solid state media wherein solid state memory is used for storing indexing information or metadata
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N5/00—Details of television systems
  • H04N5/76—Television signal recording
  • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
  • H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N5/00—Details of television systems
  • H04N5/76—Television signal recording
  • H04N5/84—Television signal recording using optical recording
  • H04N5/85—Television signal recording using optical recording on discs or drums
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N9/00—Details of colour television systems
  • H04N9/79—Processing of colour television signals in connection with recording
  • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
  • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
  • H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction

Definitions

• the invention relates to an improved t ⁇ ckplay processing for a data stream recorder, m particular a DVD based data stream recorder.
• Stream recording assumes an application device, e.g. a set- top box, connected to a DVD Streamer. Both devices are connected via e.g. an IEEE1394 (IEC 61883) interface including transmitting and receiving firmware.
• Stream Data include one or more 'Stream Objects' which each can be stored as a 'Program Stream' as described m ISO/IEC 13818-1, Systems.
• APAT application packet arrival time
• ATS application timestamp
• AU access unit
• AUD AU data
• AUELL access unit end location list
• AUEM access unit end map
• AULL access unit location list
• AUSLL access unit start location list
• AUSM access unit start map
• DTS decoding timestamp
• DVD digital versatile disc
• DVD RTR DVD realtime rewritable
• DVD VR DVD video recording
• IAPAT incremental application packet arrival time
• MAPL mapping list
• LB logical block
• PAT packet arrival time
• PES packetised elementary stream
• PTS presentation timestamp
• SCR system clock reference
• SOB stream object
• STB set top box
• S_PCK stream pack
• TOC table of content.
• a SOB can be terminated by a program_end_code .
• the value of the SCR field m the first pack of each SOB may be non-zero.
• a SOB contains the Stream Data packed into a sequence of Stream Packs. Stream data can be organised as one elementary stream and are carried m PES packets with a stream_ ⁇ d. In Stream recording, the application performs its own padding so that the pack length adjustment methods of DVD-ROM Video or RTR need not to be used. In Stream recording it is safe to assume, that the Stream packets will always have the necessary length.
• the invention allows to realise Access Units.
• the resulting AUs have a resolution range from 2 SOBUs up to packet' exact.
• the precision depends on the used DVD Streamer, i.e. whether the DVD Streamer knows the application and e.g. how much RAM memory is available. Therefore the precision depends on the design of the manufacturer.
• Each SOB contains its own AU data.
• This AUD consists of a general information, one or two coarse lists and one or two fine lists.
• the coarse list is called the Access Unit Start Map AUSM.
• the AUSM consists of N flags (N is the number of SOBUs of this SOB) . Each flag belongs to one SOBU. The flag indicates that:
• a fine list is called the Access Unit Location List AULL and contains the exact locations of the application packets of all AUs. For each AU indicating AUSM/AUEM flag there exists one location information inside AULL. Two kinds of AULLs exist:
• the part inside the AULL containing the start location is called the Access Unit Start Location List AUSLL.
• the part inside the AULL containing the end location is called the Access Unit End Location List AUELL.
• the complete AU information of an SOB consists of either • the sector & application packet location of the start of the AU and
• a trickplay mode e.g. fast forward, is performed by select ⁇ ing the desired AUs, e.g. each second AU, via AUSM/AUEM.
• the generation of AUSM, AUEM, AUSLL and AUELL during SOB recording is optional, i.e. is a matter of the manufacturer.
• the use of AUSM, AUEM, AUSLL and AUELL for trickplay modes is also optional. However, it is mandatory to update AUSM, AUEM and AULL m the case of editing.
• Fig. 3 to 5 show three examples .
• the DVD Streamer specification defines the syntax of the AUs, not the generation or use of the AUs. However, here are some examples for how to generate AUSM/AUEM and AULL:
• the application device sends after transmission of the stream special data which contain a list of AU as APATs, i.e. each APAT of the list is the APAT of one of the just recorded application packets.
• the streamer must assign each APAT to the corresponding application packet:
• a high end streamer generates a special list during stream recording. This list contains the APAT values of each recorded application packet and the corresponding location m the stream, e.g. sector No. and application packet No. .
• the streamer is able to generate all lists: AUSM/AUEM (SOBU accurate) and AULL.
• AUSM/AUEM SOBU accurate
• AULL AULM/AUEM
• a standard streamer has not enough memory to generate a list with APATs and application packet location information inside the local RAM. Therefore, m this case the streamer will generate only the AUSM (2 SOBU accurate), but not the AUEM and AULL.
• a high end streamer could generate therefrom the accurate AULL and AUEM (SOBU accurate) and could refine AUSM SOBU accurate, e.g. during an idle mode of this high end streamer .
• the streamer contains dedicated hardware to parse the incoming stream, i.e. the application is known by the streamer. This parser recognises automatically Access Units like I-pictures. With such additional hardware AUSM/AUEM (SOBU accurate) and AULL can be easily generated during stream recording.
• the application uses special digital interface commands to mark an application packet as AU during transmission of the stream to the streamer. Then the streamer is able to generate AUSM/AUEM and AULL m parallel during stream recording if the digital interface is defined accordingly.
• the application knows nothing about the streamer. In this case AUs will not be generated. After that a high end streamer can generate the missing AUSM/AUEM (SOBU accurate) and AULL, e.g. during idle mode of the streamer.
• Wi thout end of AU informa ti on :
• the trickplay mode e.g. fast forward, is performed by searching for the desired AUs, e.g. each second AU, inside the AUSM. If existing, with AULL the exact location of the first application packet of the AU is known. Without AULL, the streamer assumes that the AU is located anywhere m the SOBU indicated by AUSM or in the following SOBU. The streamer jumps to this position and starts the transmission of the application packets to the application with the first application packet of this SOBU. The streamer stops the transmission after having transmitted a fixed amount of data, e.g. 1.8 Mbit or until the next AU, and jumps to the next desired AU. If the streamer knows the application it can parse the stream during transmission of the AU and will stop the transmission when the end of the AU is reached, e.g. the end of an I-picture.
• the transmission of the AU can also be performed application packet accurate.
• the only difference to the first alternative is that, if the AULL exists, the transmission of an AU to the application device stops with the transmission of the last application packet of the AU.
• Bitstream data start and end marks
• navigation data for AUSM, AUEM, AULL
• the inventive method is suited for implement- ing trickplay modes m a bitstream recorder, wherein the bitstream is organised m stream objects and access to the bitstream is performed using access units and access unit information is attached to the stream objects of the bit- stream and to navigation data to be recorded, and wherein said access unit information includes an access unit start map, and optionally an access unit end map, which are used m the trickplay modes together with the navigation data for access to the bitstream.
• the inventive bitstream recorder is suited for implementing trickplay modes, wherein the bitstream is organised m stream objects and access to the bitstream is performed using access units and access unit information is attached to the stream objects of the bitstream and to navigation data to be recorded, and wherein said access unit information includes an access unit start map, and optionally an access unit end map, which are used m the trickplay modes together with the navigation data for access to the bitstream.
• Fig. 1 simplified overall system for DVD Stream Recording
• Fig. 2 basic directory and file structure
• Fig. 3 access to application packet via AUSM and AULL
• Fig. 4 access to application packet via AUSM, but without AULL
• Fig. 5 access to application packet whereby AULL also contains end of AU information
• Fig. 6 table showing the maximum possible Access Unit support which is storable by a specific configuration
• Fig. 7 structure of a Stream Object Information
• Fig. 8 structure of the AUD_FLAG byte
• Fig. 9 structure of the Access Unit Data
• FIG. 10 example of an AUSM and its corresponding SOBUs
• Fig. 11 example of AUSM, AUSLL, AUEM, AUELL and the related data access mechanism.
• Fig. 1 shows a simplified block diagram of a settop box AD and a Stream recorder device STRD.
• AD interacts via an m- terface IF, e.g. an IEEE1394 interface, with STRD.
• AD sends its data via output buffering & timestampmg handling means BTHOAD to IF and receives from IF data via input buffering & timestampmg handling means BTHIAD.
• a streamer STR within STRD sends its data via output buffering & timestampmg han- dlmg means BTHO to IF and receives from IF data via input buffering & timestampmg handling means BTHI .
• any other network like the Ethernet or the Internet can be used.
• any other data stream source can be used, e.g. a DVD player or a PC or Internet receiver.
• ANT and TU is replaced by e.g. an optical disc and a pickup.
• the DVD Stream Recording system is designed to use rewri- table DVD discs for recording existing digital bitstreams, editing them and playing them back as bitstreams. This system is designed to satisfy the following requirements:
• a timing mechanism i.e. a time stamp is added to every broadcast packet to enable proper packet delivery during playback.
• Real -time Recording The system is designed to enable real-time recording of digital streams. It allows the user to concatenate recordings, even if those recordings consist of different stream formats. If recordings are concatenated, a seamless or close-to-seamless playback feature can be achieved, but is not required.
• An 'original' version of a play list contains quite low level information, e.g. time map or (broadcast) packet order of the recording. This list is accessible by the STB and the content is understood by the DVD streamer as well as by the STB. In its original version the playlist enables the playback of a complete recording. The playlist may be accessed and extended after recording by the STB to allow more sophisticated playback sequences.
• the second piece of information, a mapping list is generated to support the stream recorder to retrieve packet stream chunks (cells), that are described m terms of the application domain, e.g. ⁇ broadcast packets' or ⁇ t ⁇ me' . This list is owned and understood by the DVD streamer only.
• the system can reserve space which can be used by the STB to store high-level TOC and Service Information. This lnforma- tion is provided for the user to navigate through the content stored on disc and may contain sophisticated EPG information. The content needs not to be understood by the stream recorder. However a common subset of the TOC information, e.g. based on a character string, may be useful to be shared between STB and DVD, m order to enable the stream recorder to provide a basic menu by itself.
• Playback of individual recording and playing all recordings sequentially is possible via a play list.
• the STB can generate a sophisticated menu based on the TOC information stored on the disc.
• a simple menu is generated by the streamer itself, e.g. via some Character' information which is shared by STB and DVD.
• the DVD streamer creates the 'original version' of the play list. It can allow extensions and modifications of the play list by the STB for more sophisticated playback features.
• the DVD streamer is not responsible for the content of those sophisticated playlist (s).
• the system supports the deletion of single recordings on user's request. Preferably the system allows this feature under the control of the STB.
• the system may support insert editing.
• Any DVD Streamer device has certain requirements to store its own housekeeping data or Streamer-specific navigation data on the disc. These data are solely for helping the retrieval of recorded data; they need not be understood or even be visible to any outside application device AD. Any DVD Streamer device needs to communicate with the application device AD it is connected to. This communica- tion is as universal as possible so that the maximum possible range of applications can be connected to the Streamer.
• the Navigation Data to support such communication are called Common navigation data and must be understandable by the Streamer as well as by the application device.
• the Streamer device offers to the connected application device AD a means for storing its own private data of any desired kind.
• the Streamer needs not to understand any of the content, internal structure, or meaning of this ap- plication-speciflc navigation data.
• Application Private Data i.e. information that is spe- cific to the Application (s) connected to the Streamer. Needs not to be understood by the Streamer.
• - REALTIME SOB Recorded real-time stream data proper. Note that except for the files described above, the STRREC directory shall not contain any other files or directories.
• the DVD Streamer Format Draft version 0.3, realises trick play support by the Entry Point Data of Section 2.2.3.3.3. According to the invention, some of these features have been revised order to allow improved trickplay modes.
• the invention takes the following into account:
• the wordlength of the time based addressing information has been changed from a 6 byte time value of the APAT type to a 4 byte time value of the ATS type.
• a second bit flag array AUEM has been introduced parallel to the already existing AUSM.
• the time based address information is not only more compact, but also more directly usable.
• the invention can also be used without value AULL.
• the Stream Object Information SOBI includes the Stream Object Information General Information SOBI_GI, the Mapping List MAPL and the Access Unit Data AUD, if any.
• the mapping list includes incremental application packet arrival times and is described more detail m EP 98250387.2 of the applicant.
• SOBI GI may have the following format: Contents Number of Bytes
• AUD_FLAGS Indicates whether and what kind of Access Unit Data exist for this SOB. If Access Unit Data exist, then AUD_FLAGS also describes several properties of the Access Unit Data. The Access Unit Data itself is described below and includes the number of Entry Points and the tables AUSM, AUSLL, AUEM, AUELL and PTSLL. The content of AUD_FLAGS is depicted in Fig. 8. RTAU_FLG 0: no AU flags exist inside the RT Data of this
• SOB 1 AU flags may exist inside the RT Data of this SOB. This state is even allowed, when no further Access Unit Data exist for this AUD FLG no Access Unit Data exist for this SOB.
• the bits b5, b4, b3 and b2 of EP_FLAGS shall be set to 0.
• SOB_S_APAT Describes the start Application Packet Arrival Time APAT of the Stream Object, i.e. the packet arrival time of the first packet belonging to the SOB.
• SOB_S_APAT is described m DVD Stream Recording's PAT Describing Format defined below: PATs are divided into two parts, namely a base part and an extension part.
• the base part PAT_base (bits 9 to 47) holds the so-called 90kHz unit value, and the extension part
• PAT m seconds PAT_base/ 90kHz + PAT_exten/27MHz
• PAT_exten must be m the range of 0 ⁇ PAT_exten ⁇ 300.
• PAT_base and PAT exten cover a range of more than 1696 hours.
• Stream Object Unit i.e. the Stream Object Unit containing the first Application Packet of the Stream Object.
• the Access Unit Data AUD include the Access Unit General Information AU_GI, and may also include the Access Unit Start Location List AUSLL, the Access Unit End Map AUEM, the Access Unit End Location List AUELL and/or the Presentation Time Stamp List PTSL. Which of these parts exist is indicated by AUD_FLAGS of SOBI_GI, see above .
• AU_GI only exists if AUD_FLAGS of SOBI_GI indicates that Ac ⁇ cess Unit Data exist.
• AU_Ns describes the number of locations where AUSM indicates the existence of an Access Unit.
• the Access Unit Start Map indicates which of the SOBUs of this SOB contain Access Units. For each SOBU of the SOB, exactly one AUSM entry exists. Therefore the AUSM consists of MAPL_ENT_Ns entries. Each AUSM entry indicates an accessible Access Unit somewhere within the corresponding SOBU or within the subsequent SOBU. Exactly AU_Ns Access Units are indicated by the AUSM, equivalent to exactly AU_Ns bits of AUSM being equal to ⁇ l' .
• AUSM shall be byte aligned. If the concatenated AUSM entries consist of a number of bits which are not an integer multi- pie of 8', then the remaining LSBs of the last byte of the AUSM shall be the necessary additional padding bits. These alignment bits shall be set to v 0' .
• Fig. 10 shows an example of an AUSM and its corresponding SOBUs. With this kind of Access Unit Data, no more than one addressable Access Unit can be described per each SOBU of the SOB.
• AUSLL is a list of location information to find the application packet where the bitstream segments of the Access Units start. Therefore, if AUSLL exists, each Access Unit as marked AUSM has exactly one AUSLL entry associated to it. AUEM, if it exists, is a bit array of the same length as
• the bits m AUEM indicate which of the SOBUs contain the end of the bitstream segment associated with the Access units of the SOB.
• the number of bits set m AUEM must be equal to the number of bits set m AUSM.
• AUELL if it exists, is a list of location information to find the exact application packet where the bitstream segments of the Access Units stop. Therefore, if AUELL exists, each Access Unit as marked AUEM has exactly one AUELL entry associated to it.
• Each application packet, indicated by the AUELL entries is the last application packet belonging to the Access Unit.
• the entries of AUSLL and AUELL are m ascending order, i.e.
• AUSLL and AUELL are time based, i.e. their entries are defined as
• AU_ATS describes the Application Time Stamp of an application packet mside the SOBU associated with this entry.
• AU_ATS are identified by comparing them with the individual ATS of the Application Packets mside the bitstream data.
• Fig. 11 shows an example of AUSM, AUSLL, AUEM, AUELL and the related data access mechanism.
• the Presentation Time Stamp List PTSL is the list of the Presentation Time Stamps of all the Access Units of the SOB, i.e. if PTSL exists, each Access Unit has exactly one corresponding PTSL entry, and PTSL then has AU_Ns entries.
• the entries of PTSL are ascending order, i.e.
• the second PTSL entry is associated to the Access Unit occurring second mside AUSM • and so on.
• Each PTSL entry is defined as
• the entries of the table depicted m Fig. 6 show the maximum possible Access Unit support which is storable by the de- scribed configuration. This is the performable support ust after an SOB recording. If an entry consists of two states, separated by a slash, that entry describes the following:
• SOBU desired application packet is the indicated SOBU; 2 SOBU desired application packet is m the indicated SOBU or the following SOBU; APAT complete APAT of the desired application packet.
• the streamer is not able to calculate directly the sec- tor and application packet number from the APAT, i.e. an access to the application must be performed via the MAPL; packet exact and direct application packet location. The location is given by a sector number and the appli- cation packet number mside this sector.
• the streamer has just enough RAM to store a coarse list which indicates the SOBUs containing an AU.
• the streamer has additional RAM to store the complete AU information (coarse list + AU start location + AU end location + PTS) and the exact packet loca- tion + ATS mside the RAM for each incoming application packet during recording.
• the streamer has just enough RAM to store a list which indicates the SOBUs containing an AU. The streamer knows the application, i.e. the streamer is able to find the AUs
• this streamer has additional RAM to store the complete AU information (coarse list + AU start location + AU end location + PTS).
• the streamer knows the application, i.e. the streamer is able to find the AUs (start, end and PTS) during recording and playback due to the implemented stream parser.
• STB sends AU list after recording: the application knows that a streamer records the sent ap ⁇ plication packets. After recording of a take (SOB) the application sends a list of AU information (AU start ATS + AU end ATS + PTS) to the streamer.
• SOB recording of a take
• STB sends AUs during recording: the application knows that a streamer records the sent application packets.
• the application sends parallel, e.g. via an isochronous channel, AU information (AU start ATS + AU end ATS + PTS) to the streamer.
• the navigation data related to one Access Unit includes four items of information: • coarse: coarse list.
• the list describes the SOBUs which have an AU .
• Fine fine list. This list describes the unambiguous location of the AU either as APAT or as sector number + application number inside this sector.
• PTS list of PTSs. Each AU has exact one PTS.
• stream means AU marks inside the stream. If ⁇ yes' the stream con- tains additional information for the streamer to detect such application packets which contain an AU start or an AU end.

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• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Signal Processing For Digital Recording And Reproducing (AREA)
• Television Signal Processing For Recording (AREA)
• Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
• Digital Magnetic Recording (AREA)
• Management Or Editing Of Information On Record Carriers (AREA)
• Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

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• 1999
  • 1999-07-13 EP EP99250231A patent/EP1039468A3/en not_active Withdrawn
• 2000
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  • 2000-03-06 DE DE60007972T patent/DE60007972T2/de not_active Expired - Lifetime
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