WO1998035348A1 - Equipment with digital interface and method for digital interfacing - Google Patents
Equipment with digital interface and method for digital interfacing Download PDFInfo
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- WO1998035348A1 WO1998035348A1 PCT/JP1998/000473 JP9800473W WO9835348A1 WO 1998035348 A1 WO1998035348 A1 WO 1998035348A1 JP 9800473 W JP9800473 W JP 9800473W WO 9835348 A1 WO9835348 A1 WO 9835348A1
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- reference signal
- recording
- timing reference
- data
- transmission
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-
- 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]
- H04L12/40—Bus networks
- H04L12/40052—High-speed IEEE 1394 serial bus
- H04L12/40058—Isochronous transmission
-
- 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
-
- 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
- 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
- G11B20/1201—Formatting, e.g. arrangement of data block or words on the record carriers on tapes
- G11B20/1202—Formatting, e.g. arrangement of data block or words on the record carriers on tapes with longitudinal tracks only
- G11B20/1205—Formatting, e.g. arrangement of data block or words on the record carriers on tapes with longitudinal tracks only for discontinuous data, e.g. digital information signals or computer program data
-
- 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
- G11B27/032—Electronic editing of digitised analogue information signals, e.g. audio or video signals on tapes
-
- 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
-
- 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
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- 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]
- H04L12/40—Bus networks
- H04L12/40052—High-speed IEEE 1394 serial bus
- H04L12/40117—Interconnection of audio or video/imaging devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/40—Network security protocols
-
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/90—Tape-like record carriers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/28—Timers or timing mechanisms used in protocols
-
- 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
- H04N5/7824—Television signal recording using magnetic recording on tape with rotating magnetic heads
- H04N5/7826—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape
- H04N5/78263—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape for recording on tracks inclined relative to the direction of movement of the tape
- H04N5/78266—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape for recording on tracks inclined relative to the direction of movement of the tape using more than one track for the recording of one television field or frame, i.e. segmented recording
-
- 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 present invention relates to a device having a digital interface suitable for dubbing recording by a network conforming to the IEEE 1394 standard, and a digital interface method.
- VTR magnetic recording / reproducing device
- VTR Magnetic Tape Recorder
- An HD standard for compressing an HD (High Definiton) signal such as a baseband signal of (High Definition TV) and recording it as a digital signal has been determined.
- Consumer digital VTRs (hereinafter referred to as DVTRs) that comply with these standards are also being commercialized.
- FIG. 1 is an explanatory diagram for explaining a tape recording format in the SD standard.
- FIG. 1 shows a recording track 16 formed on a tape 15.
- the recording track 16 has a plurality of areas corresponding to the types of data, namely, an ITI (INSERT AND TRACK INFORMATION) including an SSA (Start-Sync Block Area) and a TIA (Track ID Area), and It has a video area, a video area, a subcode area, and the like. These areas are sequentially arranged from the lower end to the upper end of the tape 15. Note that gaps GAP1 to GAP3 and an amble portion (AMBLE) are provided between these regions.
- the ITI, the audio area, the video area, and the sub-code area are sequentially recorded and reproduced by the head trace.
- the head traces in the evening of the head switch pulse shown in Fig. 2. Trace is performed by the rotating head at the rising and falling timings of the head switch pulse in FIG.
- the head switch pulse is generated in synchronization with the frame pulse shown in FIG. 2.
- 10 traces are performed in one frame period. That is, one frame is recorded on 10 tracks.
- Figure 3 shows the data transmitted during this one track period. As shown in Fig. 3, one track period is 3.33 msec. During this period, the data written in the ITI, audio area, video area, and subcode area described above is transmitted. .
- the head switch pulse is a signal that provides a reference for recording a track in DVTR, and the head switch pulse enables cylinder servo to be applied.
- each sync block is 90 bytes long and has a 2-byte synchronization signal (S YN C) and a 3-byte ID.
- the video area shown in FIG. 1 has SYNC of 2 bytes, ID of 3 bytes, video data area of 77 bytes, horizontal parity C1 of 8 bytes, and vertical parity C2 of 77 bytes.
- the video area includes a video auxiliary data area (VAUX 0 to VAUX 2) for each one sync port, a video data area of 135 sync blocks, and a vertical parity C2 of 11 sync blocks.
- FIG. 4 is a block diagram showing the related technology of DVTR that inputs and outputs only digital data.
- IEEE 1394 is capable of multiplex transfer of multiple channels.
- IEEE 1394 has an isochronous transfer function that guarantees that video and audio data is transferred within a certain period of time, it is a digital interface suitable for image transmission. ing. It should be noted that IEEEE1394 is described in detail in JP-A-8-279818.
- such a cable of the IEEE 1394 standard is connected to the terminal 1.
- the 1394 circuit 2 controls the link layer and the physical layer in the digital interface of the IEEE 1394 standard, and transmits data over a 1394 cable (not shown) connected to the terminal 1. Take The data is supplied to the digital I / F bucket conversion circuit 3 and the data from the digital I / F bucket conversion circuit 3 is transmitted to the 1394 cable.
- the digital I / F bucket conversion circuit 3 performs packet conversion between an IEEE1394 standard packet and an SD standard packet.
- the packet is converted into an SD standard bucket by a digital I / F bucket conversion circuit 3 and supplied to a correction encoding / decoding circuit 5.
- the digital I / F packet conversion circuit 3 converts the input data of one sync block into an IDIF (digital interface) block, and converts one track of data into a 150 DIF block.
- the data is converted to data and input / output is performed in units of 150 DIF blocks.
- the output of the digital I / F packet conversion circuit 3 is rearranged by, for example, the correction encoding / decoding circuit 5 so as to be in the order of the data in FIG.
- the correction encoding / decoding circuit 5 reads the data written in the memory 6, arranges a vertical parity C 2 (outer code) for error correction with respect to the data in the track direction in FIG.
- the horizontal parity C 1 (inner code) is arranged for.
- the error correction coding / decoding circuit 5 adds the outer code and the inner code and outputs the data to the modulation / demodulation circuit 7 in the recording format order shown in FIG.
- Such error correction processing is controlled by the microcomputer 10.
- the output of the correction encoding / decoding circuit 5 is recorded on a tape 9 via an amplifier equalization detection circuit 8 after being modulated by a modulation / demodulation circuit 7.
- one frame is recorded on 10 tracks, but it is not allowed by the standard to change the contents of system data within the recording unit of one frame, and the middle of one frame is not allowed. Track from the day Evening is not rewritten.
- the Consumer Digital VTR Council has decided to use MPEG2 as the compression method for ATV and DVB, the next-generation digital broadcasting.
- the ATV and DVB standards adopt a method of recording data compressed in the MPEG2 format as it is.
- the SD and HD standards use the intra-frame compression method, but MPE G2 uses not only intra-frame compression but also encoding using inter-frame compression.
- the length of the MPEG 2 data is not a fixed frame length, and the number of tracks required to record 1 frame data is undefined. Therefore, recording is performed in track units, and subcode, VAUX and AAUX are completed in track units. Therefore, in this case, it is conceivable that the error correction encoding / decoding circuit 5 can perform the error correction process using memories for several tracks.
- the correction encoding / decoding circuit 5 needs to store the data in the track direction necessary for generating the outer code. Therefore, encoding of the outer code requires a memory for storing data for one track and a memory for one track for reading data from this memory and creating an outer code.
- the encoding of the inner code is performed in sync block units, it can be performed simultaneously with the output processing to the modulation / demodulation circuit 7. Since these processes are performed cyclically for data sequentially input in units of tracks, the memory for one track corresponds to each of the above-described processes, so that the memory for n tracks can be used for input. Process and outer code addition process and inner code addition process And output processing.
- the apparatus of FIG. 4 can record digital data of a plurality of standards.
- the transmitting side converts the isochronous data into an IEEE 1394 standard isochronous bucket and transmits it.
- the reference timing signal of the original data to be transmitted is used.
- the data is a reference signal in the header data of the isochronous bucket when packetizing a data group with the same timing as, for example, a data group including the first data of one frame. A flag such as a frame pulse is inserted.
- the header flag of the received packet is extracted, and the start timing of the frame is adjusted by the flag indicating the beginning of one frame. This allows synchronization between the transmitter and the receiver.
- FIG. 5 is a timing chart for explaining such a synchronization operation.
- FIG. 5 illustrates synchronization in a plurality of devices.
- Fig. 5 shows the 1394 bucket at the top, showing the head switch pulse of receiver A, error correction processing and recording processing from the top, and the head switch pulse of receiver B (B).
- 2 shows an error correction process (B) and a recording process (B), and shows a head switch pulse (C) of the receiver C, an error correction process (C), and a recording process (C).
- the receiver DVTR uses the correction coding / decoding circuit shown in Fig. 4.
- a delay time of n track periods usually occurs. That is, the output of the digital I / F packet conversion circuit 3 in FIG. 4 is recorded on the tape 9 with a delay time of n track periods for error correction processing and recording processing.
- FIG. 5 shows an example in which the error correction process requires one cycle of the head switch pulse, that is, two track periods (the recording processing delay amount in FIG. 5).
- the rotation servo of the cylinder is a head switch that represents one track period.
- the modulation / demodulation processing is currently processed in units of 24 bits, and the time delay due to the modulation / demodulation processing can be ignored.
- the output timing of the correction encoding / decoding circuit 5 substantially coincides with the timing stored on the tape 9.
- the input start of the error correction processing is also a recording start timing signal using the head switch pulse as a reference signal. To synchronize.
- the output of the digital I / F packet conversion circuit 3 based on the 1394 bucket is corrected and decoded.
- the error correction process requires two track periods, and after two track periods from the input to the error correction / encoding / decoding circuit 5, the magnetic recording is performed on the tape 9 from the pump equalization detection circuit 8.
- the head switch pulses (B) As for other receivers B and C, as shown in FIG. 5, the head switch pulses (B),
- Error correction processing and recording processing are performed at the timing according to (C).
- the error correction input processing is performed by the heads of the receivers A, B, and C. Since it is performed in synchronization with the switch pulse, it is necessary to hold the input 1394 packets by the delay amount shown in Fig. 5. For this reason, the device shown in FIG. 4 has a non-soap memory 4, and the digital I / F packet conversion circuit 3 uses the buffer memory 4 to output to the error correction encoding / decoding circuit 5.
- FIG. 6 is an explanatory diagram for explaining a tracking pilot signal.
- pilot signals F0, F1, and F2 are used as pilot signals for tracking, and pilot signals are used for each track.
- Fl, F0, F2, F0, Fl, F0, F2, F0, ... are sequentially superimposed and recorded.
- the levels of the pilot signals Fl and F2 included in the playback signal are compared, and the pilot signals F0 and F0 are superimposed so that the comparison levels match.
- Control is performed so that the track phase matches the track. In this case, the track phase can be made coincident with the track of the pilot signal F 0 every four tracks, considering the track phase shift direction.
- the receiver of FIG. 4 uses the buffer memory 4 to start the output of the correction coding / decoding circuit 5 at a timing n tracks (two tracks in the example of FIG. 5) before the first track. Keep data as it is.
- the digital I / F packet conversion circuit 3 outputs the data read from the buffer memory 4 to the correction encoding / decoding circuit 5.
- the running of the tape 9 is started, and the recording data from the amplifier equalization detection circuit 8 is magnetically recorded on the tape 9.
- the sofa memory 4 needs to have a capacity to store a maximum of one frame (10 tracks) of data overnight. The circuit scale increases.
- a method in which the transmitter adjusts data transmission timing can be considered. That is, the transmitter may adjust the transmission timing so that the receiver can receive the data at a timing n tracks before the first frame so that the recording is performed at the timing of the first frame.
- this method it is possible to use a buffer couch with a relatively small capacity as a buffer memory 4 for adjusting the timing of data input to the correction encoding / decoding circuit 5 in the receiver. Become.
- the transmitters need to have the same number of frame memories as the number of receivers.
- a method of inserting a servo reference signal into the isochronous data may be considered.
- synchronization is achieved using the servo reference signal.
- the receiver since the receiver starts the servo retract operation after receiving the isochronous data, it takes a relatively long time until the servo phases of all the receivers are locked. After that, each receiving device must temporarily hold data in a buffer until the phases match. Therefore, in this case also, a large-capacity memory is required as the buffer memory.
- a large-capacity buffer is required for synchronization, and there is a problem that the circuit scale is increased.
- a large-capacity buffer is required to perform synchronized dubbing using a plurality of devices, and there is a problem that a circuit scale is increased.
- the present invention provides a digital camera capable of synchronously recording and recording data without requiring a large-capacity buffer, making it possible to take a continuous shot, and enabling dubbing of a sink using a plurality of devices. It is an object of the present invention to provide an apparatus having an interface and a method for digital interface. Disclosure of the invention
- An apparatus having a digital interface according to claim 1 of the present invention includes one or more first devices in a network including a plurality of devices.
- a timing reference signal transmitting means provided in the device, for converting an original timing reference signal into first synchronously transmitted data, and transmitting the converted data to a transmission line constituting the network; and
- a timing reference signal generating means provided in a second device other than the first device to obtain a timing reference signal based on the original timing reference signal transmitted through the transmission path; and
- a transmission which is synchronized with the original timing reference signal or the timing reference signal converts a predetermined transmission data into a second synchronously transmitted data, and transmits the data to the transmission path.
- Means, provided in a device in the network, for receiving the second synchronously transmitted data via the transmission path and receiving the original synchronous reference data. are those provided with the recording means performs recording in synchronization with the No. or said timing reference signal,
- the original timing reference signal is converted into a first synchronously transmitted data by the original timing reference signal transmitting means of the first device and transmitted to the transmission line.
- the timing reference signal generating means of the second device other than the first device receives the transmitted original evening reference signal and obtains its own timing reference signal. Thereby, the second devices other than the first device are synchronized with each other.
- the device having the transmitting means converts predetermined transmission data into second synchronously transmitted data based on the original timing reference signal or the evening reference signal, and transmits the data to the transmission path.
- the second synchronously transmitted data is received by the recording means of the receiving device, and is recorded in synchronization with the original timing reference signal or the timing reference signal.
- a digital signal interface method is a method for transmitting an original timing reference signal from one or more first devices in a network formed by a plurality of devices in a first synchronous manner.
- a timing reference signal transmitting procedure for converting the original timing reference signal transmitted through the transmission path into the first timing reference signal transmitted through the transmission path.
- a synchronization procedure for performing synchronization by obtaining a recording timing reference signal based on the transmitted original timing reference signal received by a second device other than the second device, and a device in the network.
- a predetermined transmission time is converted into second synchronously transmitted data.
- the first device transmits the first synchronously transmitted data based on the original evening reference signal to the transmission path.
- a second device other than the first device obtains a timing reference signal based on the transmitted original timing reference signal '. This synchronizes the devices in the network.
- a second synchronous transmission based on the transmission data is transmitted from the transmitting device to the transmission path.
- This transmission is performed in synchronization with the original timing reference signal or the timing reference signal.
- the receiving device receives and records the second synchronously transmitted data in synchronization with the original timing reference signal or the timing reference signal. This enables synchronous recording and splicing recording.
- FIG. 1 is an explanatory diagram for explaining a recording format of the SD standard
- FIG. 2 is an explanatory diagram for explaining a frame pulse and a headswitch pulse
- FIG. 3 is an explanatory diagram showing a data recorded on a tape.
- 4 is a block diagram showing the related technology of D ⁇ TR
- FIG. 5 is a timing chart for explaining the operation of the DVTR in FIG. 4
- FIG. 6 is an explanatory diagram for explaining the pilot signal
- FIGS. 8 is a block diagram showing an embodiment of a device having a digital interface according to the present invention
- FIG. 9 is constituted by a device having a digital interface according to the embodiment of FIGS. 7 and 8.
- FIG. 10 is an explanatory diagram illustrating an isochronous packet
- FIG. 10 is an explanatory diagram illustrating an isochronous packet
- FIG. 11 is a timing chart illustrating the operation of the embodiment of FIGS. 7 and 8, and FIG. 1 and 2 correspond to Figs. 7 and 8.
- Facilities in the form Furochiya Ichito for explaining the operation of FIG. 1 3 and 1 4 is a blanking-locking diagram showing another embodiment of the present invention.
- FIG. 7 and FIG. 8 are block diagrams showing an embodiment of a device having a digital interface according to the present invention.
- FIG. 7 shows the transmitting side
- FIG. 8 shows the receiving side.
- FIG. 9 is an explanatory diagram for explaining a network configured using the device having the digital interface according to the present embodiment.
- FIG. 9 shows an example in which a network is configured by one transmitter 15 and three receivers 16 to 18.
- Transmitter 15 and receivers 16 to 18 are, for example, For example, a digital VTR.
- the transmission path 19 for example, an IEEE 1394 cable capable of transmitting and receiving isochronous data is employed.
- transmission path 19 for example, an IEEE 1394 cable capable of transmitting and receiving isochronous data is employed.
- transmission of data for synchronization is performed prior to transmission of data to be recorded.
- FIG. 7 shows a specific configuration of the transmitter 15 in FIG. 9, and FIG. 8 shows a specific configuration of the receivers 16 to 18 in FIG.
- a playback signal from a source is input to an input terminal 21 (not shown).
- This reproduced signal is supplied to a reproduced signal processing circuit 22.
- the reproduction signal processing circuit 22 performs a predetermined signal processing on the reproduction signal to create a dubbing image for dubbing.
- the reproduction signal processing circuit 22 can have a configuration similar to the configuration in which the 1394 circuit 2 and the digital I / F bucket conversion circuit 3 are deleted from the reproduction side circuit in FIG.
- the reproduction signal processing circuit 22 obtains reproduction data by performing demodulation processing after waveform equalization of the reproduction signal.
- the reproduction signal processing circuit 22 performs error correction decoding processing on the reproduction data to perform error correction, and performs data reordering to obtain, for example, an SD standard bucket from the reproduction data. .
- the reproduction signal processing circuit 22 controls the reproduction signal processing by a cylinder servo circuit and a tape running servo circuit 26.
- the cylinder servo circuit and the tape running servo circuit 26 generate, for example, a head switch pulse and a frame pulse as a reproduction reference signal and a frame reference signal.
- the head switch pulse serves as a reference signal for head switching and cylinder rotation in the DVTR.
- the frame pulse indicates the head position of the frame of the reproduction signal.
- the output of the reproduction signal processing circuit 22 is supplied to the isochronous packet conversion circuit 23 as dubbing data.
- the isochronous packet conversion circuit 23 converts the reproduced data into an isochronous packet and outputs it.
- the output of the isochronous packet conversion circuit 23 is a digital interface transmission circuit 25 via a switch 24. It is supplied to.
- the cylinder servo circuit and the tape running servo circuit 26 output the generated reference signal and the frame reference signal to the isochronous packet conversion circuit 27.
- the isochronous packet conversion circuit 27 has the same configuration as the isochronous packet conversion circuit 23, and converts an input reference signal (original timing reference signal) to an output signal and outputs it.
- FIG. 10 is an explanatory diagram showing an example of an isochronous bucket output from the asynchronous bucket converter 27.
- headers are arranged at the beginning of the isochronous packet, then headers CRC and CIP headers are arranged, and then an isochronous area including the isochronous area is arranged. It is arranged, and finally the data CRC is arranged.
- the CIP header has an FDF area.
- the frame pulse is inserted as a flag in the FDF area.
- the data of the reference signal such as a head switch pulse is inserted into an isochronous data area.
- the output of the isochronous bucket conversion circuit 27 is supplied to a digital interface transmission circuit 25 via a switch 24.
- the switch 24 switches and selects the output of the isochronous bucket conversion circuits 23 and 27 and supplies the output to the digital-in-interface transmission circuit 25.
- the digitizer interface transmission circuit 25 controls the link layer and the physical layer of IEEE1394, and uses the input isochronous bucket as an isochronous packet of the IEEE1394 standard to set the output terminal 28. Via a 1394 cable (not shown).
- the reference signal and the frame reference signal from the cylinder servo circuit and the tape running servo circuit 26 are transmitted before the dubbing data is transmitted.
- an isochronous packet from a 1,394 cable (not shown) is input to the input terminal 31 in FIG.
- This isochronous packet is supplied to the digit line receiver circuit 32.
- the digital interface receiving circuit 32 controls the link layer and the physical layer of the IEEE 1394, receives the input IEEE 1394 standard isochronous packet, and switches the switch 33 Output.
- the switch 33 supplies the isochronous packet of the dubbing data of the input data to the isochronous packet conversion circuit 34, and the isochronous packet of the reference signal to the isochronous packet conversion circuit 36.
- the isochronous bucket conversion circuits 34 and 36 have the same configuration.
- the isochronous packet conversion circuit 34 converts the input IEEE 1394 standard isochronous packet into dubbing data and outputs it to the recording processing circuit 35.
- the isochronous packet conversion circuit 36 converts the input IEEE 1394 standard isochronous packet into a reference signal and a frame reference signal, and outputs the reference signal and the frame reference signal to the cylinder servo circuit and the tape running servo circuit 37. I have.
- the recording processing circuit 35 performs predetermined recording processing on the input dubbing data. To the head via the output terminal 38.
- the word recording processing circuit 35 can have a configuration similar to the configuration in which the 1394 circuit 2 and the digital I / F bucket conversion circuit 3 are deleted from the circuit on the recording side in FIG.
- the recording processing circuit 35 performs correction coding and reordering of the input SD standard packets so that the SD standard recording format data is obtained. I'm sorry. Further, the recording processing circuit 35 modulates and amplifies the dubbing data subjected to the error correction processing, and supplies it to a head (not shown) via a terminal 38.
- the recording processing circuit 35 is controlled by a cylinder servo circuit and a tape running servo circuit 37.
- the cylinder servo circuit and the tape running servo circuit 37 create a reference signal and a frame reference signal to be used in the own machine based on the input reference signal and the frame reference signal. For example, a headswitch pulse and a frame pulse are used as a reference signal and a frame reference signal, respectively.
- the cylinder servo circuit and tape running servo circuit 37 control the rotation of the cylinder and the tape running in synchronization with the head switch pulse and the frame pulse.
- the cylinder rotation and the tape running of the own machine are transmitted. This is synchronized with the cylinder rotation of the machine 15 and the tape running.
- the cylinder servo circuit and the tape running servo circuit 37 supply the generated reference signal and the frame reference signal to the recording processing circuit 35.
- the recording processing circuit 35 has a timing based on the reference signal and the frame reference signal. For example, error correction processing or the like is performed.
- the dubbing data is transmitted in synchronization with the reference signal and the frame reference signal of the transmitter 15, and the receivers 16 to 18 use the reference signal and the frame reference signal based on the standard signal and the frame reference signal of the transmitter 15. Since recording processing is performed, synchronization can be performed without holding received data in the buffer memory.
- FIG. 11 shows, from above, the headswitch pulse of the transmitter 15, the 1394 isochronous packet from the isochronous bucket conversion circuit 27, the isochronous packet on the 1394 cable, and the receiver. 16 to 18 key switch, isochronous bucket conversion circuit 23 13 9 isochronous bucket, 13 9 4 data on cable, isochronous bucket restored in receivers 16 to 18, reception 14 shows an error correction process of the receivers 16 to 18 and a recording process of the receivers 16 to 18.
- the period of the head switch pulse is 3.33 ms
- the length of the isochronous cycle is 125 ⁇ seconds.
- the receivers 16 to 18 receive and record the isochronous data reproduced by the DVTR as the transmitter 15. It is assumed that the DVTRs, which are the receivers 16 to 18, perform splicing recording on a tape on which recording has already been performed.
- transmission of isochronous data from transmitter 15 is notified (dubbing instruction is generated) (step S 1), and receivers 16 to 18 are set in a recordable state. Until That is, a status command indicating, for example, "under preparation” is transmitted to the transmitter until the synchronization with the transmitter 15 is completed (step S6). In this case, the receivers 16 to 18 send a “synchronizing” command to the transmitter 15 as a status command. As a result, the transmitter 15 is in a standby state for transmission of the dubbing overnight.
- each of the receivers 16 to 18 performs the cylinder rotation and the tape running based on the mutually independent reference signals, and also exchanges the reference signals such as the torque and the frame. Has an independent phase.
- the synchronization may be performed before the dubbing data is transmitted.
- the synchronization may be performed at the same time as connecting the device to the 1394 cable.c In this case, the receivers 16 to 18 are preparing. Can be shortened.
- FIG. 11 the transmission of the dubbing and the transmission of the reference signal are shown at the same timing to simplify the drawing.
- the transmitter 15 is performing head rotation and tape running using the head switch pulse shown in FIG. 11 as a reference signal.
- the transmitter 15 transmits a reference signal for synchronization before transmitting the dubbing data (step S2). That is, the cylinder servo circuit and the tape running servo circuit 26 of the transmitter 15 supply the head switch pulse to the isochronous bucket conversion circuit 27. The head switch pulse is converted into an isochronous packet in an isochronous packet conversion circuit 27, and the isochronous packet shown in FIG. Supplied.
- the digitizer interface transmission circuit 25 controls the link layer and the physical layer of the IEEE 1394 standard to transmit an isochronous packet for transmitting a reference signal from a terminal 28 to a not-shown 1394 cable. To send to. Note that The processing of the interface transmission circuit 25 generally requires a predetermined time of about one isochronous cycle (125 milliseconds), and the iso-noise packet is, as shown in FIG. The signal is transmitted over the 1394 cable at the transmission rate specified in IEEE 1394 with a delay of a predetermined delay time.
- the isochronous packet shown in FIG. 11 is taken into the digital interface receiving circuit 32 via the terminals 31 of the receivers 16 to 18.
- the digital interface receiving circuit 32 controls the link layer and the physical layer of the IEEE 1394 standard, receives the isochronous packet, and supplies it to the isochronous packet converting circuit 36 via the switch 33. I do. Note that, due to the processing of the digital interface receiving circuit 32, a delay time of, for example, about one isochronous cycle is generated similarly to the transmitting side.
- the isochronous packet is returned to the original reference signal in the isochronous bucket conversion circuit 36 and supplied to the cylinder servo circuit and the tape running servo circuit 37.
- the cylinder servo circuit and the tape running servo circuit 37 generate a reference signal whose phase is synchronized with the input reference signal and use it as a reference signal of the own machine (step S7).
- the cylinder servo circuit and the tape running servo circuit 37 control cylinder rotation, tape running, recording processing, and the like based on the reference signal (step S8).
- the receivers 16 to 18 require, for example, two traffic periods for error correction processing, the receivers 16 to 18 receive two isochronous cycles + two tracks with respect to the head switch pulse of the transmitter 15. A frame pulse delayed by a period is used.
- the reproduction timing of the transmitter 15 and the recording timing of the receivers 16 to 18 are synchronized with a delay time of 2 isochronous cycles + 2 track periods.
- the receivers 16 to 18 transport the tape to the recording position (the position of the first frame) of the receiver itself (step S 9), and then pause and stand by.
- the cylinder rotates based on the reference signal.
- the receivers 16 to 18 output an ASYNCHRONUS (asynchronous) signal indicating that they can be received or transmitted to the transmitter 15 (step S10).
- the transmitter 15 can transmit the dubbing data.
- the transmitter 15 performs head tracing based on the head switch pulse in FIG. 11 and reproduces data recorded on a tape (not shown) (step S3).
- the reproduced signal is supplied to a reproduction processing circuit 22, where waveform equalization, demodulation, error correction processing and the like are performed.
- the reproduced signal is supplied to the isochronous packet conversion circuit 23 as dubbing data, and as shown in FIG. 11, an isochronous packet is obtained from the frame start timing in synchronization with the head switch pulse.
- This isochronous packet is supplied to the digit-in-time transmitter circuit 25 via the switch 24, and is delayed by one isochronous cycle, and the IEEE1394 standard cable is connected from the terminal 28 to the 1394 cable.
- the isochronous bucket of dubbing shown in Fig. 11 is transmitted over the 1394 cable.
- This isochronous packet is input to the digitizer receiver circuit 32 of each of the receivers 16 to 18 (step S11). As shown in FIG. 11, the digital interface receiving circuit 32 delays the input isochronous packet by one isochronous cycle, and delays the isochronous packet through the switch 33 via the isochronous packet. Output to the conversion circuit 34.
- the isochrono packet is returned to the original dubbing data, for example, an SD standard image and audio packet by the isochrono packet conversion circuit 34 and supplied to the recording processing circuit 35 ( Step S12). That is, a bucket of dubbing data is input to the recording processing circuit 35 at the timing shown in FIG. This timing is a timing preceding, for example, two track periods with respect to the frame start timing of the receivers 16 and 18.
- the recording processing circuit 35 performs error correction coding on the input bucket, performs data rearrangement, and converts the data into, for example, an SD standard recording format. Further, the recording processing circuit 35 modulates and amplifies the dubbing data which has been subjected to the error correction coding, and supplies the resulting data to a head (not shown) via a terminal 38.
- the cylinder servo circuit and the tape running servo circuit 37 start the tape running after the recording processing delay amount required for the processing in the recording processing circuit 35, perform head tracing, and record the dubbing time.
- Start (step S13) The recording processing delay amount required for the processing in the recording processing circuit 35 is a two-track period, and the head starts recording on the tape at the head timing of the frame as shown in FIG. Since the receivers 16 to 18 perform the processing using the synchronizing soft switch pulses, the recording is started from the head timing of the frame in any of the receivers 16 to 18. Since the receivers 16 to 18 are in the standby state at the position of the first frame, the splicing recording is reliably performed in any of the receivers 16 to 18.
- the reference signal is transmitted prior to the transmission of the dubbing data, and the dubbing data is transmitted after achieving synchronization between the receivers using the reference signal. It has become.
- synchronizing can be performed without requiring a large-capacity buffer on the receiver side.
- the receiver uses a reference signal based on the reference signal of the transmitter, and even if the transmitter sends out the dubbing data reproduced in accordance with the reference signal of its own device, the receiver side has a large-capacity buffer. It is possible to perform splicing recording in which recording is performed from the frame start timing without the need for a frame. It is also clear that a large-capacity buffer is not required on the transmitter side. That is, it is possible to perform recording from a predetermined recording position on the receiving side without requiring a large-capacity buffer in any of the transmitter and the receiver, and it is possible to reduce the circuit scale in a dubbing apparatus. it can.
- the transmission delay is described as 1 or 2 isochronous cycles.
- the present invention is not limited to this, and may be any delay amount.
- FIG. 13 and FIG. 9 is a block diagram showing an example in which one of the transmitters transmits a reference signal, and another receiver and a transmitter generate a reference signal based on the transmitted reference signal.
- FIG. 13 shows the transmitting side
- FIG. 14 shows one receiving side that transmits the reference signal.
- the configuration of the other receiving side is the same as in FIG. In FIGS. 13 and 14, the same components as those in FIGS. 7 and 8 are denoted by the same reference numerals, and description thereof will be omitted.
- the transmitter shown in FIG. 13 includes an isochronous bucket converting circuit 27, a cylinder servo circuit and a tape running servo circuit 37 instead of an isochronous bucket converting circuit 27, a cylinder servo circuit and a tape running servo circuit 26, respectively. 7 in that a digital interface transmission / reception circuit 41 is used instead of the digital interface transmission circuit 25.
- the digital interface transmitting / receiving circuit 41 has functions of a digital interface transmitting circuit 25 and a digital interface receiving circuit 32.
- a digital interface transmitting circuit 25 For example, the link layer and the physical layer of the IEEE 1394 standard are provided.
- the layer is controlled so that the isochronous packet from the switch 24 is sent out to the 1394 cable, and the isochronous packet flowing through the 1394 cable is taken in and output to the switch 24. It has become.
- one receiver for transmitting the reference signal is replaced by a cylinder servo circuit, a tape running servo circuit 37, and an isochronous packet conversion circuit 36, and is replaced by a cylinder sensor.
- a tape running servo circuit 26 and an isochronous packet conversion circuit 27 a digital signal-in-one-face transmission is performed in place of the digital signal-in-one-face receiving circuit 32.
- the difference from the receiver in FIG. 8 is that a receiver circuit 42 is employed.
- a reference signal is transmitted from the receiver shown in FIG. 14 before transmitting the dubbing data. That is, the cylinder servo circuit and the tape running servo circuit 26 output a reference signal used by the own machine to the isochronous package / socket conversion circuit 27. This reference signal is converted into an isochronous packet by an isochronous packet conversion circuit 27, and then supplied to a digit line interface transmission / reception circuit 42 via a switch 33 to be connected to a 1394 cable. Sent out.
- the reference signal flowing through the 1394 cable is input to the transmitter shown in Fig. 13 and another receiver having the same configuration as that shown in Fig. 8.
- the isochronous bucket is taken in by the digital transmitting / receiving circuit 41 and supplied to the isochronous bucket converting circuit 36 via the switch 24.
- the isochronous packet is returned to the original reference signal by the isochronous packet conversion circuit 36 and supplied to the cylinder servo circuit and the tape running servo circuit 37.
- the cylinder servo circuit and the tape running servo circuit 37 generate their own reference signals based on the input reference signals.
- the cylinder servo circuit and the tape running servo circuit 37 generate a reference signal having a timing that takes into account the delay time of the bucket conversion processing and the recording / reproducing processing.
- another receiver having the same configuration as that of FIG. 8 generates a reference signal having a timing in consideration of a delay time of a packet conversion process, a recording / reproducing process, and the like for the transmitted reference signal.
- the transmitter After synchronization is achieved between the transmitter and the receiver, the transmitter sends out dubbing data.
- the operation during transmission and recording in the dubbing process is the same as in the embodiment of FIGS. 7 and 8.
- the isochronous transmission of a plurality of channels is performed. It is possible to transmit data, and it is also possible to transmit data from a plurality of transmitters in a network by multi-channel and record the data by one or more receivers. It can be applied to such a case.
- the reference signal may be different for each channel, and the same phase may be used. It may be.
- a head switch pulse is used as a reference signal by taking a DVTR as an example of a transmitter and a receiver. It is clear that you can. '
- the device having the digital interface and the digital interface method according to the present invention are connected via a network. It is useful for recording control between a plurality of devices that have been connected, for example, for performing continuous recording by dubbing on a network that complies with the IEEE1394 standard.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Computer Security & Cryptography (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Television Signal Processing For Recording (AREA)
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP98901515A EP0903737A1 (en) | 1997-02-07 | 1998-02-05 | Equipment with digital interface and method for digital interfacing |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02562597A JP3529574B2 (ja) | 1997-02-07 | 1997-02-07 | ディジタルインターフェースを有する装置及びディジタルインターフェース方法 |
| JP9/25625 | 1997-02-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998035348A1 true WO1998035348A1 (en) | 1998-08-13 |
Family
ID=12171065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1998/000473 Ceased WO1998035348A1 (en) | 1997-02-07 | 1998-02-05 | Equipment with digital interface and method for digital interfacing |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6366630B1 (ja) |
| EP (1) | EP0903737A1 (ja) |
| JP (1) | JP3529574B2 (ja) |
| CN (1) | CN1219272A (ja) |
| WO (1) | WO1998035348A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1024493A3 (en) * | 1999-01-27 | 2004-06-09 | Sony Corporation | Digital signal transmission, computer program product, and recording medium |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6188987B1 (en) * | 1998-11-17 | 2001-02-13 | Dolby Laboratories Licensing Corporation | Providing auxiliary information with frame-based encoded audio information |
| JP4501187B2 (ja) | 1999-10-22 | 2010-07-14 | ソニー株式会社 | 情報処理装置、情報処理システム及び情報処理方法 |
| US6584521B1 (en) * | 1999-12-27 | 2003-06-24 | Pmc-Sierra, Inc. | Scaleable bandwidth interconnect for simultaneous transfer of mixed pleisiochronous digital hierarchy (PDH) clients |
| JP2004242172A (ja) * | 2003-02-07 | 2004-08-26 | Canon Inc | 再生装置 |
| JP2005328280A (ja) | 2004-05-13 | 2005-11-24 | Canon Inc | データ処理装置 |
| JP4643439B2 (ja) | 2005-12-27 | 2011-03-02 | 株式会社東芝 | 携帯型撮像装置 |
| JP2010244643A (ja) * | 2009-04-08 | 2010-10-28 | Sanyo Electric Co Ltd | コンテンツ記録システムおよびコンテンツ記録制御方法 |
| JP2012151795A (ja) * | 2011-01-21 | 2012-08-09 | Sony Corp | 映像記録装置と映像記録制御方法 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07327032A (ja) * | 1994-05-31 | 1995-12-12 | Matsushita Electric Ind Co Ltd | 送信装置と受信装置 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3808368A (en) * | 1973-02-23 | 1974-04-30 | Gte Automatic Electric Lab Inc | Slaved pcm clock circuit |
| US4122477A (en) * | 1977-01-28 | 1978-10-24 | Ampex Corporation | Method and apparatus for inserting synchronizing words in a digitalized television signal data stream |
| FR2467524A1 (fr) * | 1979-10-10 | 1981-04-17 | Thomson Csf Mat Tel | Procede de commutation de signaux multiplexes temporellement et transmis par une onde porteuse, en particulier une onde lumineuse, et dispositif de mise en oeuvre |
| JPH05143507A (ja) | 1991-11-25 | 1993-06-11 | Mitsubishi Precision Co Ltd | 計算機間のデータ同期転送方式 |
| US5524107A (en) * | 1992-08-21 | 1996-06-04 | General Datacomm, Inc. | Multiport multidrop digital system |
| JP3561969B2 (ja) | 1994-08-30 | 2004-09-08 | ソニー株式会社 | 編集方法及び編集制御機器 |
| JPH08228183A (ja) * | 1995-02-20 | 1996-09-03 | Fujitsu Ltd | 信号処理装置及び信号処理方法 |
| JP3249334B2 (ja) | 1995-04-06 | 2002-01-21 | 株式会社東芝 | ディジタルインターフェース装置及びディジタルインターフェース方法 |
-
1997
- 1997-02-07 JP JP02562597A patent/JP3529574B2/ja not_active Expired - Lifetime
-
1998
- 1998-02-05 CN CN98800244.2A patent/CN1219272A/zh active Pending
- 1998-02-05 EP EP98901515A patent/EP0903737A1/en not_active Withdrawn
- 1998-02-05 WO PCT/JP1998/000473 patent/WO1998035348A1/ja not_active Ceased
- 1998-10-07 US US09/167,531 patent/US6366630B1/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07327032A (ja) * | 1994-05-31 | 1995-12-12 | Matsushita Electric Ind Co Ltd | 送信装置と受信装置 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1024493A3 (en) * | 1999-01-27 | 2004-06-09 | Sony Corporation | Digital signal transmission, computer program product, and recording medium |
| US6788653B1 (en) | 1999-01-27 | 2004-09-07 | Sony Corporation | Digital signal transmission method digital signal transmission system, digital signal transmitting apparatus and recording medium |
| EP2270808A3 (en) * | 1999-01-27 | 2011-09-21 | Sony Corporation | Digital signal transmission, computer program product, and recording medium |
| USRE43271E1 (en) | 1999-01-27 | 2012-03-27 | Sony Corporation | Digital signal transmission method digital signal transmission system, digital signal transmitting apparatus and recording medium |
| USRE43962E1 (en) | 1999-01-27 | 2013-02-05 | Sony Corporation | Digital signal transmission method, digital signal transmission system, digital signal transmitting apparatus and recording medium |
| USRE45120E1 (en) | 1999-01-27 | 2014-09-09 | Sony Corporation | Digital signal transmission method, digital signal transmission system, digital signal transmitting apparatus and recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3529574B2 (ja) | 2004-05-24 |
| EP0903737A1 (en) | 1999-03-24 |
| US6366630B1 (en) | 2002-04-02 |
| JPH10228725A (ja) | 1998-08-25 |
| CN1219272A (zh) | 1999-06-09 |
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