WO2006109699A1 - 転送装置 - Google Patents
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- WO2006109699A1 WO2006109699A1 PCT/JP2006/307378 JP2006307378W WO2006109699A1 WO 2006109699 A1 WO2006109699 A1 WO 2006109699A1 JP 2006307378 W JP2006307378 W JP 2006307378W WO 2006109699 A1 WO2006109699 A1 WO 2006109699A1
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- transmission
- packet
- pcr
- time stamp
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4344—Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2803—Home automation networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2803—Home automation networks
- H04L12/2838—Distribution of signals within a home automation network, e.g. involving splitting/multiplexing signals to/from different paths
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/23608—Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/43615—Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2803—Home automation networks
- H04L2012/2847—Home automation networks characterised by the type of home appliance used
- H04L2012/2849—Audio/video appliances
Definitions
- the invention belongs to the technical field of home network construction technology.
- Home network construction technology is a technology that establishes a network by connecting various devices such as Settop BOX, Digital TV, BD recording device, AV-HDD device, personal computer, etc. to each other using IEEE1394. .
- the transfer source device that transfers the stream and the transfer destination device have continuous and real-time characteristics such as video and audio.
- a time stamp indicating the time of transmission is attached to each packet on the sender side, and the time interval of each packet is restored on the receiver side with reference to a powerful time stamp. After deleting the time stamp attached to the packet, it is sent to the decoder in its own device.
- Patent Document 1 Japanese Patent No. 3609508
- Patent Document 2 JP-A-2005-026854
- Patent Document 3 Patent Patent No. 3575100
- Patent Document 4 JP 2002-100113
- Patent Document 5 JP 2002-100114
- Non-Patent Document 1 "Thorough dissection of next-generation optical disc technology (3rd)" Nikkei Electronics July 21, 2003 issue
- Non-patent document 2 MPEG standard ISO / IEC 13818-1
- the home network described above is generally constructed as a "closed network".
- a closed network is a network constructed using a stream specified in the application layer standard for a specific recording medium, such as a Blu-ray Disc, as the transmission target.
- a specific recording medium such as a Blu-ray Disc
- a first object of the present invention is to provide a transfer apparatus that can promote the opening of a home network while ensuring reproduction quality.
- a second object of the present invention is to provide a transfer device that can maintain compatibility with old equipment and ensure reproduction quality while improving convenience during dubbing.
- a transfer device is a transfer device that transfers a stream to another device, and there are a plurality of types of streams to be transferred. Two of them are types in which each packet constituting the stream is not time-stamped, and each packet has a time-stamped type. Judgment means for determining which of the types corresponds, and selection means for selecting a transmission method for a stream to be transferred from a plurality of transmission methods based on the determination result of the determination means It is characterized by that.
- a transfer device is a transfer device that receives a packet sent from one device in a network to a transmission path and transfers the packet to another device.
- Receiving means for receiving packets transmitted in bursts on the transmission path, storage means for storing each received packet, and reading out a plurality of packets stored in the storage means to determine the transmission interval of each packet.
- sending means for sending to the transfer destination device while adjusting.
- a transfer device that achieves the first objective is placed at the relay point of this supply path, and the transfer device executes the transfer.
- the device selects an appropriate transmission method depending on whether or not a time stamp is added to each packet and whether the assigned time stamp is valid or invalid. As a result, the existence of time stamps for each stream and the difference between valid and invalid are absorbed, and the quality of stream playback can be maintained. If the transfer device is located as a relay point, it is allowed to mix various devices in the home network, and therefore, it is possible to promote the opening of the network.
- a transfer device that achieves the second purpose is arranged at a relay point of the supply path, If isochronism is ensured with the transfer destination that is the display device, transmission (burst transmission) ignoring isochronism is allowed between the transfer source and the relay point. Since burst transmission is allowed between I points in the transfer source device, high-speed dubbing using burst transmission is possible between these devices. It is only necessary to perform burst transmission between the transfer source device and the relay point, and transmission between the relay point and the transfer destination device can be performed while ensuring isochronism. The destination device does not need to execute a new protocol.
- FIG. 1 is a diagram showing a home network configured by using a transfer device according to the present invention as a data transfer relay point.
- FIG. 2 is a diagram showing an internal configuration of a transfer apparatus according to the present invention.
- FIG. 3 is a diagram showing an internal configuration of a transmission unit 6.
- FIG. 4 is a diagram for explaining a transport stream sending method at the time of PCR reference sending.
- FIG. 5 is a diagram showing an internal configuration of a time stamp giving / transmitting unit 8 and a PCR reference sending unit 9.
- FIG. 6 A list of time stamp types.
- FIG. 7 is a diagram showing a packet with a time stamp appended and a packet with a time stamp appended.
- FIG. 8 is a flowchart showing a determination procedure by a time stamp type determination unit 5.
- FIG. 9 is a flowchart showing a determination procedure by the time stamp type determination unit 5.
- FIG. 10 is a flowchart showing a determination procedure by the time stamp type determination unit 5.
- FIG. 11 is a timing diagram visually representing packet loss.
- FIG. 12 is a flowchart showing a real-time monitoring procedure according to the second embodiment.
- FIG. 13 is a diagram showing an internal configuration of a transfer device according to a third embodiment.
- FIG. 14 is a diagram showing an internal configuration of a transmission unit 6 according to the third embodiment.
- FIG. 15 is a diagram showing an example of a determination table when AV-HDD is specified as the transfer destination device, AV-HDD is specified as the transfer source device, and DTV / STB is specified as the transfer destination device.
- FIG.16 Shows the transfer made on the home network when the judgment table is described as shown in Fig.15.
- FIG. 17 is a diagram showing an example of a judgment table when a personal computer is specified as a transfer source device and a WWW site is described in a provider.
- FIG. 18 This shows the transfer made on the home network when the judgment table is written as shown in FIG.
- FIG. 20 This shows the transfer made on the home network when the judgment table is described as shown in FIG.
- FIG. 21 is a diagram showing an example of a determination table when a BD recorder, a video camera, and an vision camera are designated as the transfer source device.
- FIG. 22 This shows the transfer made on the home network when the judgment table is described as shown in FIG.
- FIG. 23 is a diagram showing an example of a determination table defined in detail for a device manufacturer.
- FIG. 24 is a flowchart showing a processing procedure of the control unit 4 according to the third embodiment.
- FIG. 25 is a timing chart showing an example in which the transmission timing of a packet with a PTS is shifted by executing PCR reference transmission.
- FIG. 26 is a diagram showing an example of a determination table according to the fifth embodiment.
- FIG.27 Shows the transfer made on the home network when the judgment table is described as shown in Fig.26.
- FIG. 28 is a diagram specifically showing an extension of a PCR packet generated in PCR reference transmission.
- ⁇ 29 A diagram showing an internal configuration of the PCR reference transmission unit 9 according to the fifth embodiment.
- ⁇ 30] is a flowchart showing a processing procedure of the PCR reference sending unit 9 according to the fifth embodiment.
- ⁇ 31] is a diagram showing an internal configuration of the transfer device according to the sixth embodiment.
- FIG. 32 is a diagram showing an internal configuration of the transmission unit 6 according to the sixth embodiment.
- FIG. 1 is a diagram showing a home network configured by using the transfer device according to the present invention as a data transfer relay point.
- the home network connects multiple devices with an IEEE1394 interface (DTV / STB101, AV-HDD102, 103, D-VHS tape recorder 104, BD recorder 105, high-definition camera 106, PC 107) to the IEEE1394 transmission path. It is composed by doing.
- the user can write the stream received by DT V / STB to the AV-HDD, and the DTV / STB can play the stream written to the AV-HDD.
- record on the AV-HDD The recorded stream can be dubbed to another device. The above recording, playback, and dubbing are performed by issuing to other devices based on user operations.
- the AV-HDD 102 is a transfer device according to the present invention, which receives recording, playback, and dubbing commands, and writes and reads streams based on these commands.
- the recording command is received
- the AV-HDD 102 receives the packet output from the DTV / STB 101 and the personal computer 107 and writes it to the built-in hard disk.
- the stream is read from the built-in hard disk and output to DTV / STB.
- a dubbing command is accepted, the stream is read from the built-in hard disk and output to another transfer device.
- the stream stored in the transfer device is displayed as an icon on the GUI on the device.
- the user can order playback or dubbing of each stream by double-clicking the icon on the GUI or by dragging and dropping.
- the stream is transmitted with the information on the reception time axis maintained.
- FIG. 2 is a diagram showing an internal configuration of the transfer apparatus according to the present invention.
- the transfer device is composed of a reception unit 1, a storage unit 2, a control unit 4, a time stamp type determination unit 5, and a transmission unit 6.
- the receiving unit 1 receives a packet transmitted from another device and writes it in the storage unit 2. There are multiple packet transmission methods as described later, and reception by the receiver 1 is based on one of the multiple transmission methods.
- the storage unit 2 is a hard disk drive, and manages the stream written by the reception unit 1 as a file on the file system.
- the file that stores the stream is hereafter called the stream file.
- a stream file is specified by a stream number.
- the control unit 4 decodes commands issued by other devices, and executes overall control of the transfer device according to the decoding results.
- the stream number of the stream to be transferred is delivered to the time stamp type determination unit 5.
- the time stamp type determination unit 5 transfers the stream when transferring the stream to another device.
- the stream number of the stream to be received is received, the stream corresponding to this stream number is analyzed, and the bit allocation pattern of the packet, that is, whether or not the time stamp is assigned to the packet and the validity / invalidity of the given time stamp And send the packet to the transmitter 6 using the transmission method according to the determination result.
- the above is the description of the internal configuration of the transfer device.
- the transmission unit 6 reads the stream written in the storage unit 2 and sends it to a device that is a transfer destination device. There are multiple transmission methods for this transmission method, and one of these multiple transmission methods is selected.
- FIG. 3 is a diagram illustrating an internal configuration of the transmission unit 6.
- the transmission unit 6 includes a time stamp giving / sending unit 8 and a PCR reference sending unit 9, and sending by these time stamp giving / sending unit 8 and PCR reference sending unit 9 is a time stamp type judging unit. Based on the judgment result of 5, switch 7 is configured to switch. In the following, the time stamp giving and sending unit 8 and the PCR reference sending unit 9 will be described.
- the time stamp addition / transmission unit 8 executes time stamp addition / transmission.
- Sending with a time stamp means sending a packet with a time stamp added to the packet read from the storage unit 2.
- ATS arrival time: arrival time stamp
- arrival time stamp arrival time: arrival time stamp
- the transport stream may be transmitted via the Internet or an anisochronous interface. In such cases, it is inappropriate to call it ATS. Therefore, in the present invention, the term “time stamp” is used as a meaning that is broader than the arrival time in the meaning including an example of transmission via the Internet or the like.
- the PCR reference sending unit 9 performs PCR reference sending.
- PCR reference sending is based on the PCR existing in the stream, and is sent after adjusting the timing to send one packet. That is. This is a sending process described in detail in Patent Documents 1 and 2, and when transport streams received via a network or the like are recorded and played back, transmission that ensures isochronism is not performed. Paying attention to, refer to the PCR in the stream and send each packet. In this PCR reference transmission, it is possible to ensure isochronism even in a transport stream received under conditions where isochronism is not ensured. As a result, standard reproduction can be realized.
- the first row in Fig. 4 shows the packet sequence read out to the temporary storage unit to send the recorded transport stream.
- the read packets are managed in units of PCR packets, and are handled like the n ⁇ 1th PCR group, the nth PCR group, and the n + lPCR group.
- the transmission timing of each PCR packet is determined by an STC (System Time Clock) counter.
- the STC counter counts with the reference system clock (27MHz), and the transmission timing is ensured by the value of DC component tolerance 27MHz ⁇ 30ppm specified in the MPEG standard and AC component tolerance ⁇ 500nsec. Is done.
- the PCR value described in PCR (n-1) is determined from the PCR value Time ⁇ PCR (n) ⁇ described in PCR (n).
- the PCR packet interval T (n-1) is calculated by subtracting the value Time ⁇ PCR (n-1) ⁇ . Divide this ⁇ ( ⁇ -1) by the total number of packets in the n-1st PCR group. The quotient of this division is the packet interval between each packet in the n-th PCR group. That is, transmission is performed at a constant packet rate within the PCR group.
- the nPCR group also transmits at a constant packet rate using the same method.
- FIG. 5 is a diagram showing the internal configuration of the time stamp addition / transmission unit 8 and the PCR reference transmission unit 9. Hereinafter, the internal configuration of these components will be described.
- the time stamp giving / transmitting unit 8 includes a read buffer 21, a clock counter 22, a source packetizer 23, and a packet transmitting unit 24.
- the read buffer 21 stores a plurality of packets read from the storage unit 2.
- the clock counter 22 counts the reference clock generated by locking the PLL circuit using PCR (Program Clock Reference) included in the transport stream.
- the source packetizer 23 gives each packet a time stamp indicating the time when the packet read from the storage unit 2 arrives at the read buffer 21.
- the packet sending unit 24 sends a packet with a time stamp. This completes the description of the time stamp giving and sending unit 8.
- the PCR reference transmission unit 9 includes a temporary storage unit 31, FIF032, a packet transmission unit 33, an output gate 34, a down counter 35, a PCR value extraction unit 36, and a packet interval calculation unit 37. .
- Temporary storage unit 31 temporarily holds a packet read from storage unit 2.
- the FIF032 holds the packet output from the temporary storage unit 31 in a first-in first-out manner.
- the packet sending unit 33 sends the packet held in the first-in first-out manner in FIF032 to other devices.
- the output gate 34 is a gate opened by carry-over of the down counter 35, and the packet held in the FIF 032 is sent to other devices when the gate is opened.
- the down counter 35 receives the output port signal, loads the count value from the packet interval calculation unit 37, and starts down counting. When the count value becomes zero, a carry over signal is issued.
- the PCR value extraction unit 36 acquires the PCR value from the PCR packet existing in the stream.
- the time stamp difference value thus calculated is set in the down counter 35 as an initial value.
- the transmission interval per packet is based on the difference between PCRs and the number of TS packets present in those PCR packets.
- the packet output detection unit 38 detects the timing at which a packet is output from the FIF032, At that timing, a load signal is output to the down counter 35. In response to the output of the load signal, the down counter 35 loads the time stamp difference value calculated by the packet interval calculation unit 37 as a count value.
- FIG. 6 is a table listing types of time stamps. As shown in this figure, there are the following types of time stamps.
- FIG. 7 is a diagram showing a packet with a time stamp appended and a packet with a time stamp appended.
- the time stamp type determination unit 5 determines the bit allocation pattern of the packet in the following procedure.
- FIG. 9, and FIG. 10 are flowcharts showing the determination procedure by the time stamp type determination unit 5.
- the processing procedure by the time stamp type determination unit 5 will be described with reference to FIG.
- the time stamp type determination unit 5 that acquired the transport stream first searches for the sync byte (0x47; hexadecimal) for the leading force of the stream (step Sl). This sync byte is added to the head of the 188-byte transport stream packet.
- step S5 When it is found, in the next N + 188 bytes, after confirming that 0x47 exists at the beginning of 188 bytes X times (step S5), it is determined that the time stamp is prefixed. (Step S6). Subsequently, it is determined whether the time stamp is valid or invalid (step S7), and if it is valid, the determination result that the time stamp is valid is given (step S8).
- step S9 If 0x47 is not found in the Nth byte, or if the time stamp is invalid, a determination result that the time stamp is invalid is given (step S9).
- step S10 the next 0x47 after the 188th byte is searched (step S10).
- M it is determined whether M is zero (step Sl l). If M is zero, a determination result is given that there is no time stamp (step S12). 0 If the M force is smaller than 188, it is determined that the time stamp is a trailing M byte.
- step S14 the determination result is given that the time stamp is retrofitted (step S14). Subsequently, it is determined whether the time stamp is valid or not (step S15). If it is valid, a determination result that the time stamp is valid is given (step S17). If it is invalid, a determination result that it is invalid is given (step S16).
- FIG. 9 is a flowchart showing a procedure for determining validity / invalidity of a time stamp.
- the time stamp type is first determined (step S 21). This size Specific examples will be described later.
- the nth PCR packet is detected.
- the PCR value Time ⁇ PCR (n) ⁇ is extracted from the detected PCR packet, and the corresponding time stamp t (n) is also extracted according to the type determination result (step S22).
- the n + 1-th PCR packet is detected, and the PCR value Time ⁇ PCR (n + 1) ⁇ and the time stamp t (n + 1) are similarly extracted (step S23).
- step S24 the difference between the n + 1th and nth difference values (Time ⁇ PCR (n + l) ⁇ -Time ⁇ PCR (n) ⁇ )-(t (n + l)- t (n)) is calculated (step S24), and it is determined whether this value is smaller than a predetermined value (step S25). If it is small (Yes in step S25), it is determined that the time stamp is valid (step S26). If it is larger (No in step S25), it is determined that the time stamp is invalid (step S27).
- time stamp addition transmission If it is determined that the time stamp is valid, it is determined that transmission can be performed using time stamp addition transmission.
- the PCR tolerance is specified in the MPEG standard as ⁇ 500 nsec, so it is desirable to use 500 nsec as the comparison value.
- a threshold value larger than this value may be used.
- FIG. 10 is a flowchart showing a processing procedure for determining the bit allocation type of the time stamp.
- the standard clock is generally 27 MHz, and the count value is the mainstream, so the reference clock is fixed at 27 MHz here as well.
- the PCR packet is defined in the adaptation field and is divided into two fields, PCR_base (upper 33 bits) and PCR_extension (lower 9 bits), with 6 reserved bits allocated between them. .
- the PCR value is obtained by PCR_base X 300 + PCR_ext.
- the time stamp is defined with the same bit allocation as those of the PCR value (bit allocation type 1) and that it is allocated with consecutive bits (bit allocation type 2).
- Figure 10 describes the procedure for determining such internal bit allocation examples.
- PCRx and PCRy located at a time interval of 300 X (l / 27 MHz) X 2 or more are searched (step S31).
- PCR_base is defined! /
- the upper bits are 300 times the reference clock! / If we examine the PCR at twice the interval, there will be a clear difference between the calculation results when the bit allocation is calculated incorrectly and when it is not.
- the above search uses a powerful principle.
- the time stamp corresponding to PCRx and PCRy is acquired as bit strings TSx and TSy (step S32).
- TSy ⁇ -F2 ⁇ TSx ⁇ is calculated (step S34).
- F1 and F2 are functions for deriving a bit string force time stamp value acquired corresponding to each type.
- the PCR difference value derived as described above is compared with Tl and ⁇ 2 (step S35). Thereby, the bit allocation of the time stamp is determined.
- PCR difference ⁇ T1 and PCR difference ⁇ ⁇ 2 a determination result is obtained that the time stamp is invalid (step S36). If the PCR difference is T1 and the PCR difference is not equal to T2, it is determined that the time stamp is bit allocation type 1 (step S37). If PCR difference ⁇ T1 and PCR difference T2, the determination result is made that the time stamp is bit allocation type 2 (step S38).
- the PCR allowable value ( ⁇ 500 nsec) used for the validity determination of the above-mentioned time stamp can be used as one reference standard.
- a value larger than this value may be set to a predetermined range.
- bit allocation type of the time stamp is determined. There are many other types of bit allocation, but it is possible to make the determination using the same process.
- the transfer device when a stream input to a certain device is to be supplied to a display device, the transfer device is arranged at a relay point of the supply path, If transfer is executed, the transfer apparatus selects an appropriate transmission method depending on whether or not a time stamp is added to each packet and whether the assigned time stamp is valid or invalid. As a result, the presence or absence of a time stamp for each stream and the difference between valid and invalid are absorbed, and the quality of stream playback can be maintained. If the transfer device is located as a relay point, it is possible to mix various devices in the home network, and therefore, it is possible to promote network opening.
- the transmission path contains packet jitter of V and a frequency component that is higher than the PLL control band and cannot be removed by the PLL.
- This residual error causes loss of packets on the transmission path.
- packet loss is particularly noticeable when packet jitter occurs at intervals shorter than the period in which PCR is inserted.
- a transmission line such as an IEEE1394 interface is provided with a few buffers on the sending side and the receiving side, respectively, so that some jitter can be absorbed.
- the jitter component below the PCR interval is outside the control band in the recording PLL circuit and has no suppression effect.
- Such jitter components that remain unsuppressed may cause the buffer overflow of the above-mentioned notifier, resulting in a loss of packets to be transferred.
- Such a symptom eventually results in data loss on the decoder side, and the video is interrupted or displayed as block noise.
- FIG. 11 is a timing diagram visually representing packet loss.
- the horizontal axis is the transport stream transmission time axis, and the vertical axis indicates the transfer rate of each packet.
- the transfer rate is almost constant for each PCR group (thick solid line hhl shown in the figure). In other words, the transfer speed varies even between PCRs (thin solid line hh2 shown in the figure). If the transfer rate exceeds the upper limit of the transmission path, packet loss occurs. Factors that cause such transfer rate fluctuations are the case when the PCR-PLL operation is unstable during recording, or when quantization noise is introduced in the transmission path, and when the broadcast wave is partially displayed. It may be caused by.
- the time stamp type determination unit 5 In order to eliminate such omission, the time stamp type determination unit 5 according to the present embodiment Real-time monitoring is performed to monitor in real time whether or not the time interval of each packet exceeds a predetermined value while sending a packet by sending a timestamp.
- FIG. 12 is a flowchart showing a real-time monitoring procedure according to the second embodiment. This flowchart determines the validity / invalidity of a time stamp to be transmitted in real time during execution of time stamp addition transmission, detects a packet inappropriate for time stamp transmission, and at the time of detection, This is to switch the transmission method.
- the time stamp t (m) of the mth packet is acquired (step S41).
- the time stamp t (m + 1) of the (m + 1) th packet is acquired (step S42).
- the packet interval T (m) t (m + 1) ⁇ t (m) is examined (step S43). By determining whether or not this T (m) is greater than a predetermined threshold, it is determined whether or not the transfer rate has reached the upper limit (step S44).
- the predetermined transfer rate means the maximum transfer rate when a band for transmission is acquired on the IEEE1394 interface transmission line. For example, when the IEEE1394 interface is set to use a maximum transmission bandwidth of 30 Mbps, this value is used as the upper threshold.
- the packet interval T (m) falls below a predetermined threshold when the packet jitter of a high frequency component exceeding the PLL control band is mixed in the transmission path of the IEEE1394 interface.
- step S45 If the packet interval is large, it is determined that the transfer rate has not reached the upper limit, m + 1 is substituted for m (step S45), and the next packet interval is calculated. If this packet interval is equal to or less than the predetermined threshold, it is determined that the time stamp transmission is inappropriate, and the PCR reference transmission is selected (step S46).
- step S46 if the packet interval is equal to or less than the predetermined threshold, it is determined that time stamp transmission is inappropriate and PCR reference transmission is selected (step S46).
- the packet transfer rate can be reduced from the level indicated by the thin solid line hh2 in FIG. 11 to the level indicated by the thick solid line hhl in FIG. In this way, it is possible to avoid packet loss due to the upper transfer speed limit of the transmission path. it can.
- the PCR reference transmission is performed.
- the time stamp interval is within 500 nsec, and the packet is sent using PCR reference sending. It does not cause overflow or underflow.
- the monitoring procedure in FIG. 12 may be performed in advance of packet transmission rather than being performed in real time at the time of packet transmission.
- the bit allocation pattern of the bucket is determined by analyzing the actually acquired stream.
- information sufficient for the determination is investigated in advance.
- the design stage of the transfer device it is incorporated in the time stamp type determination unit 5 in the form of a determination table.
- FIG. 13 is a diagram illustrating an internal configuration of the transfer device according to the third embodiment.
- a management table 3 is newly added to the internal configuration shown in the first embodiment.
- the receiving unit 1, the control unit 4, and the time stamp type determining unit 5 have been improved.
- new components in the present embodiment will be described.
- the management table 3 stores a stream number, a transfer source device, a transfer destination device, and a provider in association with each of a plurality of files written in the storage unit 2. By referring to this management table 3, it is possible to know which device is the transfer source device of each stream, and what kind of pronoider has created this stream.
- the receiving unit 1 receives a packet transmitted from another device and writes it in the storage unit 2.
- information indicating the transfer source device and the stream provider is acquired from the source device.
- the stream provider means the broadcasting station, service, or WWW site that broadcasts the stream.
- the control unit 4 decodes commands issued by other devices, and executes overall control of the transfer device according to the decoding results.
- a recording command is received here, a new stream number is generated, and the transfer source device and provider obtained from the issue source are written in the management table 3 in association with the stream number.
- the command issue source also obtains information indicating the transfer destination device, and the stream number of the stream to be transferred and the transfer destination device are determined by the time stamp type determination unit 5. Hand over the bow I.
- the time stamp type determination unit 5 receives the delivery of the stream number and the transfer destination device during dubbing, and searches the management table 3 for the transfer source device and provider corresponding to the stream number. To do. Then, the bit number allocation pattern of the packet is determined from the retrieved stream number, transfer destination device, and transfer source device, and the transmission unit 6 performs transmission using a transmission method according to the determination result. As described above, the time stamp type determination unit 5 determines the time stamp format from the transfer source device, the transfer destination device, and the provider, and replaces the stream analysis. In this embodiment, when there is no transfer source device, transfer destination device, or provider corresponding to the determination table, the stream analysis shown in the first embodiment is executed.
- Configuration ROM is an IEEE1394 interface. It is an internal ROM defined on the interface, and device-specific information is written. When a command is issued, it can be referenced by reading the device performance and company identifier from this Configuration ROM.
- FIG. 14 is a diagram illustrating an internal configuration of the transmission unit 6 according to the third embodiment.
- the sending unit 6 in addition to the time stamping and sending unit 8 and the PCR reference sending unit 9 shown in the first embodiment, the sending unit 6 newly provides a path for the burst sending unit 10 and the no-through sending.
- the switch 7 is configured to switch the transmission by the time stamp addition transmission unit 8, the PCR reference transmission unit 9, the burst transmission unit 10, and the pass-through transmission. In the following, this burst transmission unit 10 and pass-through transmission will be described.
- the burst transmission unit 10 performs burst transmission.
- Burst transmission refers to transmission in which a transport stream is transmitted to the IEEE1394 interface at a substantially constant transfer rate and received by another AV-HDD.
- each packet that constitutes a stream based on the reception time axis is transmitted. If the stream to be transferred is received by DTV / ST B, the isochronism in this stream indicates the reception time axis, but burst transmission has nothing to do with this reception time axis. A knot will be sent out. With such burst transmission, packets can be sent to the counterpart device at high speed.
- the time stamp given at the time of reception cannot be used as a means for restoring isochronism.
- N-times speed transmission described in “Problems to be Solved by the Invention”
- N times are specified so that the maximum bit rate does not exceed the upper limit of the transmission bandwidth. It has been.
- the burst transmission unit 10 performs transmission at a substantially constant speed by burst transmission. Since the transport stream is transmitted, the bandwidth of the transmission path can be utilized to the maximum, and the processing time for high-speed dubbing can be shortened compared to the conventional case.
- No-thru transmission refers to sending a packet with a time stamp existing in the storage unit 2 to another device as it is.
- the transmission source device Since the four types of transmission method powers as described above can be selected, the transmission source device, the transfer destination device, and the provider power can be selected for these transmission methods.
- the time stamp type determination unit 5 uses the “determination table” as a determination material.
- the determination table is information that uniquely associates a transmission method with a combination of a transfer source device, a provider, and a transfer destination device. More specifically, in the determination table, a transport stream is input from the device indicated in the transfer source device information from the provider indicated in the determination table, and the transport stream is converted into the transfer destination device information. Indicates which of the multiple transmission methods should be selected when transferring to the indicated device.
- FIG. 15 is a diagram showing an example of a determination table when AV-HDD is specified as the transfer destination device, AV_HDD is specified as the transfer source device, and DTV / STB is specified as the transfer destination device.
- “One” in the judgment table in this figure means any device.
- the other party When the other party is AV-H DD, the other party can execute PCR reference transmission, ensuring isochronism. This is what I thought would never be done. Therefore, if the destination device is an AV-HDD, Select to send out.
- the transfer source device is an AV-HDD and the transfer destination device power is 3 V / STB, the transmission method is set to PCR reference transmission. This is because if the transfer source device is an AV-HDD, the time stamp is considered invalid, and PCR reference transmission is selected.
- FIG. 16 shows transfer performed on the home network when the determination table is described as shown in FIG. This figure is created by adopting a part of the internal configuration of the home network in Fig. 1 as an original drawing and adding an arrow indicating the transfer between devices to this.
- the burst transmission is associated with the combination in which the AV-HDD becomes the transfer destination device, it can be seen that the transfer between the AV-HDD 102 and the AV-HDD 103 is performed by burst transmission.
- FIG. 17 is a diagram showing an example of a determination table when a personal computer is designated as the transfer source device and a WWW site is described in the pronoidor. “One” in the judgment table in this figure means any device.
- the determination table is described in this way because a stream such as that obtained from pass-through transmission or WWW site B should be judged as having no time stamp or invalid. This is because the transmission interval needs to be adjusted if / STB.
- FIG. 18 shows transfer performed on the home network when the determination table is described as shown in FIG. This figure is created by adopting a part of the internal configuration of the home network in Fig. 1 as an original drawing and adding an arrow indicating the transfer between devices to this.
- PCR reference transmission is associated with the combination in which the computer is the transfer source device and DTV / STB is the transfer destination device, so the transfer between AV-HDD103 and DTV / STB101 is the PCR reference transmission.
- FIG. 19 is a diagram showing an example of a determination table when a D-VHS tape recorder is designated as the transfer source device.
- FIG. 20 shows the transfer made on the home network when the judgment table is described as shown in FIG. This figure is created by adopting a part of the internal configuration of the home network in Fig. 1 as an original drawing and adding an arrow indicating the transfer between devices to this.
- FIG. 20 shows the transfer made on the home network when the judgment table is described as shown in FIG. This figure is created by adopting a part of the internal configuration of the home network in Fig. 1 as an original drawing and adding an arrow indicating the transfer between devices to this.
- FIG. 20 shows the transfer made on the home network when the judgment table is described as shown in FIG. This figure is created by adopting a part of the internal configuration of the home network in Fig. 1 as an original drawing and adding an arrow
- PCR reference transmission is associated with the combination in which the D-VHS tape recorder is the transfer source device and DTV / STB is the transfer destination device, so transfer between AV-HDD103 and D TV / STB 101 is It can be seen that this is done by PCR reference transmission.
- FIG. 21 is a diagram showing an example of a determination table when a BD recorder and a high-definition camera are designated as the transfer source device.
- transfer source device BD recorder, high-vision camera
- transfer destination device DTV / STB is associated with pass-through transmission.
- the transfer source device, BD recorder, and high-definition camera are required to record the packet with a time stamp according to the application layer standard of the recording medium. It should be determined that a stamp is attached to each packet, and pass-through transmission is automatically selected for this determination result.
- FIG. 22 shows the transfer made on the home network when the judgment table is described as shown in FIG.
- FIG. 22 This figure is created by using a part of the internal configuration of the home network in Fig. 1 as an original drawing and adding an arrow indicating the transfer between devices.
- pass-through transmission is associated with a combination in which the BD recorder, high-definition camera is the transfer source device, and DTV / STB is the transfer destination device, so the transfer between AV-HD D103 and DTV / STB 101 is It can be seen that this is done with pass-through transmission.
- FIG. 23 is a diagram showing an example of a determination table defined in detail for the device manufacturer.
- the difference from the previous example is that the manufacturer of the device is specified in addition to the device type.
- the transfer source devices are DTV / STB of Company A and DTV / STB of Company B. Each of Company C's DTV / STB is shown. Of these, DTV / STB of the transmission source equipment company, and if the provider is channel X of broadcast X, it indicates that PCR reference transmission should be selected as the transmission method.
- Channel Y of this broadcast X has the property that the bit rate variation of the transport stream is large due to problems in the broadcasting station equipment.
- the DTV / STB of Company A and Company B have the property of sending such bit rate fluctuations directly to the IEEE1394 interface. Therefore, the judgment table in this figure stipulates that when these devices are transfer source devices, PCR reference transmission is selected.
- Company D's DTV / STB absorbs the problems in the broadcasting station equipment on the DTV / STB side and has the property of suppressing bit rate fluctuations.
- the judgment table in this figure specifies that if this device is the transfer source device, it will be selected to send a timestamp.
- the transmission method is selected according to the result of the stream analysis by the time stamp type judgment unit 5 described in the first embodiment.
- the transfer device when executing a transfer using the transfer device as a relay point, the transfer device selects an optimum transmission method according to the transfer source device, the transfer destination device, and the provider based on the judgment table. .
- FIG. 24 is a flowchart showing a processing procedure of the control unit 4 according to the third embodiment.
- Steps S71 and S72 in this figure constitute a command wait loop that waits for commands issued from other devices.
- Step S71 becomes Yes, and the processing from Step S73 to Step S77 is executed.
- This process acquires the transfer source device and provider (step S73), assigns a new stream number to the stream to be recorded (step S74), and associates it with the assigned stream number.
- step S75 After entering the transfer source device and provider in the management table 3 (step S75), the file corresponding to the stream number is created (step S76), and the packets sent by other devices are also created. This is to write sequentially to the written file (step S77).
- the process proceeds again to the loop processing of step S71 and step S72.
- step S78 to step S83 When a transfer command such as dubbing or playback is issued, the processing from step S78 to step S83 is executed.
- the stream number of the stream to be transferred is detected from the command (step S78), and the transfer source device and provider corresponding to the detected stream number are acquired from the management table 3 ( (Step S79), the transfer destination device is detected from the command (Step S80), and the transmission type corresponding to the transfer source device, transfer destination device, and provider is selected by the time stamp type determination unit 5 (Step S81).
- Open the file corresponding to the stream number step S82), read the packet from the opened file, and execute the procedure to send it to the transfer destination device using the selected transmission method (step S83).
- step S71 and step S72 the process returns to the loop processing of step S71 and step S72.
- the transfer apparatus when a stream is transferred, it is considered that the stream is not correctly played back due to other factors of the transfer destination device, or the time stamp acquired by the transfer source device If the accuracy is expected to be slightly larger than the expected error, information on these transfer source devices and transfer destination devices should be obtained in advance at the design stage of the transfer device, and a decision indicating the transmission method corresponding to these will be made.
- the transfer apparatus By referring to the table by the time stamp type determination unit 5, it is possible to cause the transfer apparatus to execute packet transmission by an appropriate transmission method. With the above measures, it is possible to make up for the case where the judgment is mistaken only by the stream analysis described in the first embodiment.
- This embodiment is an improvement when there is a unique density in the isochronism inherent in the stream.
- Such congestion is caused by trying to multiplex transport streams of multiple services onto one transponder.
- TS packets of transport streams belonging to multiple services are to be multiplexed into one, so that the transport bonder appears in a certain period of time for a transport stream belonging to a specific service.
- a phenomenon occurs in which TS packets of transport streams belonging to different services appear together in different periods.
- PTS Presentation Time Stamp
- DTS Decoding Time Stamp
- PTS and DTS are arranged based on the buffer model of the transport stream decoder. If the time position is not appropriate, the transport stream decoder buffer overflows or underflows. The PCR reference transmission described so far tends to cause a shift in transmission timing.
- the notifier size at the transfer destination device is the limit value of the virtual decoder model defined by the MPEG standard.
- the size of the noffer is designed to be slightly larger, so there is little possibility of such a situation, but in the future, for example, due to the appearance of a decoder that has drastically reduced costs, Cases that are designed at the last minute are also assumed. In such a case, playback using a method that uses only PCR reference transmission is not possible.
- FIG. 25 is a timing diagram for explaining an example in which the transmission timing of a packet with a PTS is shifted by executing PCR reference transmission.
- the first row in Fig. 25 shows the arrangement of the original streams in real time. This shows a stream that is sparse and dense in the time axis direction.
- a sparse / dense stream is a stream whose transfer speed varies, and is generated by partialization. Partialization is the process of extracting one or more programs from a program multiplexed on a transponder in digital broadcasting. When this partial error is performed, temporal intervals are generated in the packet intervals arranged between PCRs. When played back using the PCR reference transmission method, the real time sequence is as shown in the third row of the figure.
- the determination table in the time stamp type determination unit 5 is configured as follows. In other words, because the equipment used differs depending on the broadcast station or channel, when multiple programs are multiplexed as a transport stream, a specific broadcast station or channel that causes local bit rate fluctuations is specified in advance. Thus, such a broadcasting station or channel is described as a provider in the determination table, and time stamping transmission or PCR reference transmission is associated with the determination table.
- FIG. 26 is a diagram showing an example of a determination table according to the fourth embodiment.
- this channel is described in the provider of the judgment table, and the time stamp giving transmission is associated with this channel. If this is the case, if the provider is a channel, time-stamped transmission is inevitably selected.
- FIG. 27 shows transfer performed on the home network when the determination table is described as shown in FIG. This figure is created by adopting a part of the internal configuration of the home network in Fig. 1 as an original drawing and adding an arrow indicating the transfer between devices to this.
- PCR reference transmission is associated with the combination in which DTV / STB becomes the transfer source device and transfer destination device, so the transfer of TS packets from AV-HDD 103 to DTV / STB 101 is time You can see that it is done by sending stamps.
- the third row in FIG. 25 shows a plurality of packets sent out when the time stamping transmission is selected. Since sending with a time stamp is selected, each packet is sent to the transfer destination device while maintaining isochronism between packets that the original stream originally has.
- FIG. 28 is a diagram specifically showing the extension of the PCR packet generated in the PCR reference transmission. The first row shows the packet sequence on the actual playback time axis sent by PCR reference sending.
- PCR reference transmission the timing of PCR packet transmission is controlled by the STC counter, Packets are sent at a constant transfer rate. For sending at a constant transfer rate,
- the time interval from PCR (n-1) to PCR (n) is T (n-1), and the time interval from PCR (n) force to PCR (n + 1) is T (n). Yes.
- the PCR packet ( ⁇ ) has a time interval T (nl) after the packet immediately before it is transmitted, as shown in the second stage of the figure. Even after elapse, it cannot be transmitted. After that, it will be sent after a while. That is, the transmission interval of the PCR packet (n) is extended. In order to fill in such extended sections and to keep the transfer rate between PCR packets constant, methods such as inserting NuU packets have been used in the past (Null packs are are for paaaing or rransport Streams.).
- the PCR packet is not transmitted by the STC counter that has been conventionally used, and the value of the PCR packet itself is rewritten in the correct real time.
- the third row in Fig. 28 shows the position of the PCR packet after rewriting and the changed packet interval. It can be seen that the position of the PCR 'packet (n) after the rewriting is done after T (n-l) has elapsed since the transmission of the previous packet. It can be seen that the packet interval from the position of PCR packet (n) to the position of PCR packet (n + 1) has been changed to T '(n).
- FIG. 29 is a diagram showing an internal configuration of the PCR reference sending unit 9 according to the fifth embodiment.
- a PCR rewriting unit 39 is newly added.
- the PCR value extraction unit 36 and the packet interval calculation unit 37 are improved.
- the improvements of these components and the new components will be described.
- the PCR value extraction unit 36 in the present embodiment detects the storage position of the PCR packet when acquiring a transport stream with a time stamp, manages this as management information, and reads it out from the storage unit 2. Configure the corresponding CR packet to be extracted while referring to the storage location indicated in the management information. As described above, by generating management information for referring to the storage location, it is possible to easily search for all PCRs, and even in a microprocessor with low processing capability, Can be realized.
- the packet interval calculation unit 37 in the present embodiment calculates the PCR value written in PCR (nl)
- the calculated time stamp difference value is set in the down counter 35 as an initial value.
- the PCR value of the n-th PCR is corrected using the remainder ⁇ obtained by the above calculation. Specifically, the PCR power of the nth PCR is calculated by subtracting the remainder ⁇ , and the PCR to be rewritten is notified to the PCR rewriting unit 39.
- the PCR rewriting unit 39 rewrites the PCR value of the corresponding PCR among the PCRs stored in the temporary storage unit 31.
- the PCR rewriting unit 39 configured as described above can be implemented in the transfer apparatus by describing the processing procedure of FIG. 30 in a computer description language and causing the CPU to execute it.
- FIG. 30 is a flowchart showing a processing procedure of the transfer apparatus according to the fifth embodiment.
- PCR (n-1) and PCR (n) packets are detected, and the total number M of packets in the n-1st PCR group is obtained (step S51).
- the PCR bucket interval T (n-l) Time ⁇ PCR (n) FTime ⁇ PCR (n-1) ⁇ Is obtained (step S52).
- the calculated time stamp difference value is set in the down counter 35 as an initial value (step S54).
- the calculated initial value is loaded into the down counter 35 immediately before the PCR (nl) packet is transmitted. become. After that, it waits for the output of PCR (nl) to be detected (step S55). If the output is detected, the packet interval calculation unit 37 calculates a value obtained by subtracting the remainder ⁇ from the PCR value of the nth PCR. Then, notify the PCR rewriting unit 39 of the PCR to be rewritten. The PCR rewriting unit 39 rewrites the PCR value of the corresponding PCR among the PCRs stored in the temporary storage unit 31 (step S56).
- n is incremented (step S57), and the process returns to step S51, whereby the same processing is performed for the next PCR packet.
- the PCR reference transmission unit 9 that sufficiently satisfies the allowable error value ( ⁇ 500n SeC or less) of the PCR packet transmission time specified in the MPEG standard is realized. be able to.
- the present embodiment relates to an improvement that does not perform real-time transmission in the transmission stage.
- the difference of this embodiment from the previous embodiments is a stream whose format has been converted rather than a transport stream in which a signal to be transmitted is transmitted in real time.
- This format conversion refers to re-stamping after determining the type of time stamp in the transport stream acquired via the Internet.
- the power described for the AV-HDD that plays a role as a relay point in stream transfer is included in the AV-HDD.
- random access type such as a blue-ray disk is included in the AV-HDD.
- a drive device for the recording medium is built in, and this drive device is used as a transport stream destination. Then, when sending a packet to this drive device, the above-mentioned time stamp reattachment is executed.
- FIG. 31 is a diagram illustrating an internal configuration of a transfer device according to the sixth embodiment.
- the transfer device according to the present embodiment has a BD drive 11 in the transfer device, and a packet sent from the transmission unit 6 is output to the BD drive 11.
- FIG. 32 is a diagram showing an internal configuration of the transmission unit 6 according to the sixth embodiment.
- the transmission unit 6 has a new time stamped transmission unit 12 in addition to the time stamp addition transmission unit 8, the PCR reference transmission unit 9 and the burst transmission unit 10 shown in the third embodiment.
- the switch 7 switches between the transmission by the time stamp assigning transmission unit 8, the PCR reference transmission unit 9, the burst transmission unit 10, and the time stamped re-transmission unit 12, and the pass-through transmission.
- the time stamped re-transmission unit 12 will be described.
- the time stamp re-transmission unit 12 sequentially deletes the time stamps attached to all packets according to the determination result of the time stamp type determination unit 5, and newly adds a predetermined time stamp. Give a tamp.
- the predetermined time stamp means a time stamp specified for the Blu-ray Disc.
- the time stamp type determination unit 5 has the following improvements.
- the time stamp type determination unit 5 selects a corresponding assigning method, and sends the output as a transport stream 109 with a time stamp after format conversion.
- FIG. 33 is a diagram showing an example of a determination table according to the sixth embodiment. As shown in this figure, a combination of a BD drive as a transfer destination device and a BD recorder as a transfer source device is associated with a transmission method of pass-through transmission.
- the transmission method of pass-through transmission is also associated with the combination of the transfer source device being DTV / STB and the transfer destination device power D drive. On the other hand, if the transfer source device is something other than these, it is specified that re-transmission with time stamp is selected.
- the transfer source device is something other than a BD recorder or DTV / STB, the transmission with time stamp is automatically selected.
- an appropriate time stamp is created and assigned to a recording medium that requires recording of a transport stream with a predetermined time stamp, such as a Blu-ray Disc drive device. For example, if the transport stream power obtained via the network has no time stamp or the time stamp is invalid, the time stamp is added by using the configuration of this embodiment.
- the format is converted via the re-transmission unit 12, and playback can be displayed on many devices.
- the transfer device located at the transfer relay point determines whether the packet to be transferred is valid or invalid.
- a device playback device
- DTV / STB executes validity / invalidity of packets transmitted on the transmission path. If the DTV / STB executes the procedure shown in the first embodiment, the playback device in the home network does not perform playback processing during transmission of a packet with an invalid time stamp. In this way, packets that cannot be synchronized with the PLL circuit are captured and played back. As a result, it is possible to prevent a powerful video from being reproduced.
- a playback device such as a DTV / STB includes the receiving unit 1 and the time stamp type determining unit 5 shown in the first embodiment, and the time stamp type determining unit 5 Refer to the time stamp attached to the packet that is transmitted to the transmission path and determine whether the time stamp is valid or invalid. If the time stamp value is valid, a status signal indicating that playback is possible is output to the control unit in the playback apparatus. If the time stamp value is invalid, a status signal indicating that reproduction is not possible is output to the control unit in the reproduction apparatus. Using the status signal as a clue, the playback device in the device determines whether to play the stream transmitted on the transmission path. If it is determined not to play back, a message indicating that “currently playback processing cannot be performed” is displayed.
- the device power for performing stream playback in the home network is determined whether the time stamp is valid or invalid, and whether or not the power to play back the stream being transmitted is determined. Therefore, during burst transmission, it is possible to prevent a situation where powerful video is output without locking the PLL circuit.
- the transfer device according to the present invention has been described as being located as a relay point in the network.
- the transfer device is a device that functions as a stream supply point, such as a broadcast receiving device or a recording medium reading device that is not at the relay point. May be. This is because even a powerful device can achieve the above-mentioned purpose by selecting an appropriate transmission method from a plurality of transmission methods.
- a feature of the third embodiment is that a transport stream in which isochronism is destroyed is sent to an isochronous transmission line, and the transport stream is restored so that it can be reproduced at standard speed. Also, unlike the conventional high-speed transmission configuration, there is no need to newly prepare commands between devices, and there is an effect that the conventional command system can be used as it is.
- the transfer device also sends a stream to the D-VHS tape recorder at high speed, records this, and transfers the stream from the D-VHS tape recorder when playback at standard speed is required again It can be returned to the device and played back.
- old equipment in the prior art, high-speed transfer could not be realized only between newly designed devices.
- isochronism cannot be restored with a conventional device when recording at a high-speed transmission on a conventional device. Therefore, it cannot be played back as video 'sound as it is, so it must be used after having the user recognize it as a handling precaution.
- the flowchart of FIG. 9 in the first embodiment describes a process that functions effectively when the transport stream stored in the storage unit 2 is an ideal stream.
- data will be lost and data will be corrupted when the transport stream is acquired. This is the case, for example, when the transmission line condition has deteriorated.
- Specific examples of such deterioration in transmission path conditions include bad weather conditions in satellite broadcasting environments and cable contact deterioration under interface transmission.
- data deterioration occurs, it must be dealt with separately as an abnormal process.
- As a method for dealing with such anomaly processing there is a method in which the same processing is performed for a plurality of locations and a decision is made by majority logic.
- the configuration is such that multiple programs are connected in one program.
- the PCR value will deviate greatly at the boundary.
- the process of FIG. 9 cannot be applied as it is. So this The processing shown in Fig. 9 can be applied by treating the boundary as a discontinuous point, temporarily stopping the playback (sending) operation and restarting it.
- the transfer process is described as dubbing.
- dubbing is a process of copying the stream onto another device while the original stream remains.
- a specific broadcast station or channel that has a large fluctuation in the bit rate of the stream is selected. It may be specified in advance. The same effect can be obtained by writing the powerful broadcasting stations and channels as providers in the determination table and associating the determination table with time stamped transmission or PCR reference transmission.
- the type is determined before the stream to be transmitted is transmitted.
- the determination process by the time stamp type determination unit 5 does not necessarily have to be performed immediately before starting the transmission.
- the analysis may be determined during or after acquisition of an external power program.
- the transport stream has been described using an example in which the transport stream is grouped as in the nth group.
- a group is not established in the first part and the last part. Is almost. That is, the PCR packet does not always exist at the beginning of the transport stream, and the final part does not end immediately before the PCR packet.
- Such a head part and a last part can be dealt with by using the inter-packet difference value obtained for the adjacent PCR group.
- the insertion period of PCR packets is defined as 100 msec or less.
- the packet interval until the next PCR packet greatly exceeds 100 msec due to the advance of the transmission time by rewriting the PCR value of the PCR packet.
- the value to be rewritten is monitored so that it does not exceed the predetermined range, and if it exceeds the predetermined range, a NuU packet is inserted as in the conventional method to send a PCR packet by rewriting. The risk of the cycle exceeding the standard value can be avoided.
- the PCR reference sending unit 9 of the fifth embodiment can send the transport stream at a constant transfer rate by changing the value loaded as the initial value of the down counter 35 to a fixed value without changing it. Become. A transport stream sent at such a constant speed can be sent to a transmission line that ensures isochronism, such as a conventional IEEE1394 interface.
- the receiver of the transport stream transmitted at a speed other than real time is DTV / STB.
- the PLL may not be able to lock to the receiving side and an irregular time stamp may be added.
- the transfer device Even if an irregular time stamp is given, if the transfer device is located at the transfer relay point between the sending side and the receiving side, the time stamp type determination unit in the powerful transfer device will be correct. It is judged whether it is attached or not, and it is sent by PCR reference sending. In other words, by positioning the transfer device at the transfer relay point between the sending side and the receiving side, high-speed dubbing using a powerful real-time transmission path that could not be easily realized in the past is achieved, but stable reproduction is possible. It can be displayed and sent out.
- the transfer device can use an existing old device such as a D-VHS tape recorder as an archive device.
- a program is transferred from a transfer device to a D-VHS recorder at high speed and stored.
- the D-VHS recorder reads the transport stream back to the transfer device, and the transfer device performs PCR reference transmission to cause the DTV / STB to execute real-time playback.
- a powerful transfer device can give the transfer device a new use.
- isochronism is not required for time stamp assignment. For this reason, this function can be realized by a process of writing calculation results by a microprocessor or the like.
- the desired time stamp is generated by the PLL lock method to the PCR, so that the conversion takes the same real time as the normal playback. Can be realized.
- the program according to the present invention is an executable program (object program) that can be executed by a computer, and includes each step of the flowchart shown in the embodiment. It consists of one or more program codes that cause a computer to execute the individual steps of a functional component. Where program code is the native code of the processor
- each step of the flowchart may be realized by combining arithmetic, logical, and branch instructions.
- a program that can be used in the present invention can be created as follows. First, a software developer uses a programming language to write a source program that implements each flowchart and functional components. In this description, the software developer uses a class structure, variables, array variables, and external function calls according to the syntax of the programming language to describe each flowchart and source program that implements functional components.
- the described source program is given to the compiler as a file.
- the compiler translates these source programs to generate an object program.
- Translation by the compiler consists of processes such as syntax analysis, optimization, resource allocation, and code generation.
- syntax analysis lexical analysis, syntax analysis, and semantic analysis of the source program are performed, and the source program is converted into an intermediate program.
- the intermediate program is divided into basic blocks, control flow analysis, and data flow analysis.
- resource allocation variables in the intermediate program are allocated to registers or memory of the processor of the target processor in order to adapt to the instruction set of the target processor.
- code generation each intermediate instruction in the intermediate program is converted into program code to obtain an object program.
- the programmer activates the linker for these.
- the linker allocates these object programs and related library programs in the memory space, and combines them into one to generate a load module.
- the load module is assumed to be read by a computer, and causes the computer to execute the processing procedure shown in each flowchart and the processing procedure of functional components.
- the program according to the present invention can be created through the above processing.
- the program according to the present invention can be used as follows.
- the load module corresponding to the program is written in the instruction ROM together with the basic input / output program (BIOS) and various middleware (operation system).
- BIOS basic input / output program
- the program according to the present invention can be used as a control program of the transfer device by incorporating such an instruction ROM into the control unit and causing the CPU to execute it.
- the transfer device is a model with a built-in hard disk
- a basic input / output program (BIOS) is built into the instruction ROM, and various middleware (operation system) is preinstalled on the hard disk. It is also installed in the boot ROM power transfer device for booting the system from the hard disk!
- the transfer device performs bootstrap with the boot ROM, starts up the operation system, causes the CPU to execute the application as one application, and uses the program according to the present invention.
- the hard disk model transfer device can use the program of the present invention as one application, the program according to the present invention can be transferred, lent or supplied through a network.
- the control unit 4 and the time stamp type determination unit 5 shown in each embodiment can be realized as a single system LSI.
- the system LSI means a package in which a bare chip is mounted on a high-density substrate.
- a system LSI that includes multiple bare chips mounted on a high-density substrate and knocked to give the bare chip the same external structure as a single LSI is also included in the system LSI. (Such a system LSI is called a multichip module;).
- system LSI types such as QFP (tad flood array) and PGA (pin grid array).
- QFP is a system LSI with pins attached to the four sides of the package.
- a PGA is a system LSI with many pins attached to the entire bottom surface.
- pins serve as interfaces with other circuits.
- Pins in the system LSI have such an interface role. By connecting other circuits to these pins in the system LSI, the system LSI plays the role of the core of the transfer device.
- the bare chip packaged in the system LSI consists of a "front end part", a “backend part”, and a "digital processing part".
- the “front-end part” is the part that digitizes the analog signal
- the “back-end part” is the part that outputs the data obtained as a result of the digital processing.
- Each component shown as an internal configuration diagram in each embodiment is mounted in this digital processing unit.
- the load module As described earlier in “Use as embedded program”, the load module, basic input / output program (BIOS), and various middleware (operation system) are written in the instruction ROM.
- the load module corresponding to this program is created in particular, so the system ROM according to the present invention is produced by packaging the instruction ROM storing the load module corresponding to the program as a bare chip. be able to.
- SoC System on chip
- SiP System in Package
- the integrated circuit generated as described above may be referred to as an IC, LSI, super-LSI, or unroller LSI depending on the degree of integration.
- each recording / transferring device may be configured as a single chip.
- Integrated circuit implementation is not limited to the above-described SoC implementation and SiP implementation, and may be realized by a dedicated circuit or a general-purpose process. It is conceivable to use a Field Programmable Gate Array (FPGA) that can be programmed after manufacturing the LSI, or a silicon figureable 'processor that can reconfigure the connection and settings of the circuit cells inside the LSI.
- FPGA Field Programmable Gate Array
- a silicon figureable 'processor that can reconfigure the connection and settings of the circuit cells inside the LSI.
- integrated circuit technology that replaces LSI emerges as a result of advances in semiconductor technology or derived technologies, it is natural that functional blocks may be integrated using that technology. For example, biotechnology can be applied.
- the transfer device according to the present invention has an internal configuration disclosed in the above embodiment, and is apparently mass-produced based on the internal configuration. Therefore, the transfer device according to the present invention has industrial applicability.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Automation & Control Theory (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Small-Scale Networks (AREA)
- Computer And Data Communications (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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JP2007512960A JPWO2006109699A1 (ja) | 2005-04-08 | 2006-04-06 | 転送装置 |
EP06731326A EP1874053A1 (en) | 2005-04-08 | 2006-04-06 | Transfer device |
US11/817,400 US20090067535A1 (en) | 2005-04-08 | 2006-04-06 | Transfer device |
Applications Claiming Priority (2)
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JP2005-112038 | 2005-04-08 | ||
JP2005112038 | 2005-04-08 |
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WO2006109699A1 true WO2006109699A1 (ja) | 2006-10-19 |
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PCT/JP2006/307378 WO2006109699A1 (ja) | 2005-04-08 | 2006-04-06 | 転送装置 |
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US (1) | US20090067535A1 (ja) |
EP (1) | EP1874053A1 (ja) |
JP (1) | JPWO2006109699A1 (ja) |
CN (1) | CN101156446A (ja) |
WO (1) | WO2006109699A1 (ja) |
Cited By (2)
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JP2009271512A (ja) * | 2008-04-09 | 2009-11-19 | Sony Corp | 暗号化ストリーム処理回路および暗号化ストリーム処理方法 |
JP2010161748A (ja) * | 2009-01-09 | 2010-07-22 | Hitachi Kokusai Electric Inc | 移動受信端末および中継装置 |
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KR101094628B1 (ko) * | 2008-12-23 | 2011-12-15 | 주식회사 케이티 | 타임스탬프를 이용한 실시간 서비스 모니터링 네트워크 장치 및 그 방법 |
JP5544863B2 (ja) * | 2009-12-17 | 2014-07-09 | 富士通株式会社 | 受信装置、受信方法及び受信プログラム |
US20130084053A1 (en) * | 2011-10-04 | 2013-04-04 | Utc Fire & Security Corporation | System to merge multiple recorded video timelines |
US9936267B2 (en) * | 2012-08-31 | 2018-04-03 | Divx Cf Holdings Llc | System and method for decreasing an initial buffering period of an adaptive streaming system |
CN105578210A (zh) * | 2015-12-30 | 2016-05-11 | 惠州市伟乐科技股份有限公司 | 一种实现消除pcr间隔异常的方法及装置 |
US10892972B2 (en) * | 2017-04-26 | 2021-01-12 | Microsemi Storage Solutions, Inc. | Scheduled network setup test method and system |
CN109491805A (zh) * | 2018-10-18 | 2019-03-19 | 北京瑞卓喜投科技发展有限公司 | 一种基于区块链的积分业务方法和业务系统 |
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- 2006-04-06 WO PCT/JP2006/307378 patent/WO2006109699A1/ja active Application Filing
- 2006-04-06 JP JP2007512960A patent/JPWO2006109699A1/ja active Pending
- 2006-04-06 EP EP06731326A patent/EP1874053A1/en not_active Withdrawn
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Also Published As
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CN101156446A (zh) | 2008-04-02 |
US20090067535A1 (en) | 2009-03-12 |
EP1874053A1 (en) | 2008-01-02 |
JPWO2006109699A1 (ja) | 2008-11-13 |
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