JP4737200B2 - Data transmission method and electronic device - Google Patents

Description

  The present invention relates to a data transmission method and electronic device for transmitting and receiving data in a network to which a plurality of electronic devices are connected.

  In recent years, for example, it has been considered that various devices having external communication ports such as set-top boxes for digital satellite broadcasting are connected to each other to construct and use a network.

  In such a network system, each device packetizes MPEG (Moving Picture Experts Group) data or the like via a network cable such as a serial bus and transmits the packetized data as a transport stream.

  Patent documents 1 and 2 are known as prior art.

JP-A-9-186968 JP-A-10-154373

  By the way, in the above-described network system, there is no support for notifying other devices of a non-continuous point of a stream such as a data change point.

  Therefore, in such a network system, when communication is performed between arbitrary devices, an unpredictable abnormal stream whose time axis changes, for example, with respect to the demultiplexer or decoder in the receiving device is generated. When it is suddenly input, there is a problem that each part such as a demultiplexer or a decoder hangs up. Further, in such a network system, there is a problem that a device that has received an abnormal stream outputs a noise image that displays a noise image or destroys a speaker.

  The present invention has been made in view of such circumstances, and in a conventional network system, a device that has received data outputs an abnormal sound that displays a noise image or destroys a speaker. It is an object of the present invention to provide a data transmission method and an electronic device for transmitting and receiving data that does not occur.

In the data transmission method according to the present invention that achieves the above-described object, when data is transmitted and received on a network constructed by connecting a plurality of electronic devices, the data is converted into MPEG (Moving Picture Experts Group) data packets, and the data is transmitted. A data transmission method for transmitting as a port stream, wherein a change in data of data recorded and / or reproduced on a recording medium is detected, and a DIT (Discontinuity Data) as discontinuous information data is detected at the detected data change. Information Table) is inserted and transmitted according to the IEEE (Institute of Electrical and Electronics Engineers) 1394 standard .

  Such a data transmission method according to the present invention indicates that the time axis of the data content is changed by inserting the discontinuous information data of the data to be recorded and / or reproduced into the recording medium.

In addition, the data transmission method according to the present invention that achieves the above-described object is a method of converting data into MPEG (Moving Picture Experts Group) data packets when performing data transmission / reception on a network constructed by connecting a plurality of electronic devices. A data transmission method for transmitting as a transport stream , detecting a data change of content of data received from the outside via a communication medium different from the network interface, and detecting the change of the detected data The DIT is inserted into the data as non-continuous information data, and the DIT is inserted when an operation mode switching point, time change, content change, or digital content change is detected as the change of the data. And transmit.

  In such a data transmission method according to the present invention, the time axis of the data content is changed by inserting discontinuous information data of data received from the outside via a communication medium different from the serial bus interface. It shows that.

Furthermore, the electronic device according to the present invention that achieves the above-described object is configured to convert data into MPEG (Moving Picture Experts Group) data packets when performing data transmission / reception on a network constructed by connecting a plurality of electronic devices. An electronic device that transmits as a transport stream, and includes a generating unit that generates a DIT (Discontinuity Information Table) as discontinuous information data of data recorded on a recording medium, and the generating unit includes the content of the data The DIT generated in the data is inserted at the change of data, and is transmitted according to the IEEE (Institute of Electrical and Electronics Engineers) 1394 standard .

  The electronic device according to the present invention configured as described above generates the discontinuous information data of data to be recorded and / or reproduced on the recording medium and inserts it into the data, so that the time axis of the content of this data is Indicates that it is changing.

Furthermore, the electronic device according to the present invention that achieves the above-mentioned object converts the data into an MPEG (Moving Picture Experts Group) data packet when performing data transmission / reception on a network constructed by connecting a plurality of electronic devices. An electronic device for transmitting as a transport stream, the tuning means for tuning data received from the outside via a communication medium different from the network interface, and the network interface and / or the tuning means As the change of the received data, the detection means for detecting the switching point of the operation mode, the time change, the change of the content, and the change of the digital content, and the data received via the network interface and / or the tuning means DIT as non-continuous information data And control means for inserting control and generates (Discontinuity Information Table), the control means, in turn detected by the detecting means of the data of the content data received through the tuning means, the DIT Insert control .

  The electronic device according to the present invention configured as described above generates the discontinuous information data of the data received from the outside via a communication medium different from the serial bus interface, and inserts the data content into the data. It shows that the time axis of is changing.

  A data transmission method according to the present invention is a data transmission method for performing data transmission / reception on a network constructed by connecting a plurality of electronic devices via a serial bus interface, and data to be recorded and / or reproduced on a recording medium When the time axis of the content changes, by inserting discontinuous information data into the data, when this data is output to the outside, the electronic device that received this data It is possible to know that it is changing, and it is possible to avoid that each part hangs up, and to output an abnormal sound that displays a noise image or destroys the speaker Can also be avoided.

  The data transmission method according to the present invention is a data transmission method for transmitting and receiving data on a network constructed by connecting a plurality of electronic devices via a serial bus interface, and is via a communication medium different from the serial bus interface. When the time axis of the content of data received from the outside changes, this data is received when this data is output to the outside via the serial bus interface by inserting discontinuous information data into the data. The electronic device can know that the time axis of the data content is changing. Therefore, the data transmission method according to the present invention can avoid the hang-up of each part of the electronic device that has received the data, and the abnormal sound that displays the noise image or destroys the speaker. Can also be avoided.

  Furthermore, an electronic device according to the present invention is an electronic device that transmits and receives data on a network constructed by connecting a plurality of electronic devices through a serial bus interface, and is discontinuous information data of data recorded on a recording medium When the time axis of the content of the data changes, the discontinuous information data generated by the generation unit is inserted into the data. Other electronic devices that have received the data can know that the time axis of the data content has changed, so that each part can be prevented from hanging up, and a noise image can be displayed. It is also possible to avoid outputting an abnormal sound that destroys the speaker.

  Furthermore, an electronic device according to the present invention is an electronic device that performs data transmission / reception over a network constructed by connecting a plurality of electronic devices via a serial bus interface, via a communication medium different from the serial bus interface. A tuning means for tuning data received from the outside, and a generating means for generating discontinuous information data of data received via the serial bus interface and / or the tuning means; When the time axis of the content changes, the discontinuous information data generated by the generating means is inserted into the data. Therefore, when this data is output to the outside via the serial bus interface, the electronic data received by this data is received. The device knows that the time axis of the data content is changing. That. Therefore, the electronic device according to the present invention makes it possible to avoid the hang-up of each part of the electronic device that has received the data, and displays a noise image or destroys the speaker. It is also possible to avoid outputting abnormal sounds.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  As shown in FIG. 1, the embodiment to which the present invention is applied is an IEEE Std. 1394-1995 IEEE Standard for a High Performance serial Bus standard approved by IEEE (The Institute of Electrical and Electronics Engineers, Inc.). Hereinafter, it is a network (hereinafter referred to as an IEEE 1394 network) 10 in which a plurality of electronic devices are connected by an IEEE 1394 serial bus 60 conforming to IEEE 1394). Here, it is assumed that two electronic devices, the data recording / reproducing media device 20 and the tuner device 40, on the IEEE 1394 network are targeted, and data transmission / reception is performed between these two electronic devices.

  In the following description, the data recording / reproducing media device 20 includes, for example, a so-called digital video home system (D-VHS) type video tape recorder (VTR), audio It is assumed that the electronic device is an audio visual hard disk drive (AV-HDD) or a digital video disk (DVD). The data recording / reproducing media device 20 records MPEG data compressed by a so-called MPEG (Moving Picture Experts Group) system on a tape or a disk (not shown), and decompresses and reproduces the compressed MPEG data. To do.

  On the other hand, the tuner device 40 is an electronic device having a tuner function, such as an integrated receiver / decoder for digital satellite broadcasting or a digital television (DTV), and transmits and receives MPEG data. Shall.

  In the IEEE 1394 network 10, MPEG data reproduced and packetized by the data recording / reproducing media device 20 is transmitted to the tuner device 40 as a transport stream (hereinafter abbreviated as MPEG-TS), and the received MPEG- The TS is unpacketized by the tuner device 40 and decompressed. In the IEEE 1394 network 10, the MPEG-TS received and packetized by the tuner device 40 is transmitted to the data recording / reproducing media device 20, and the received MPEG-TS is unpacketed by the data recording / reproducing media device 20. To record on a recording medium.

  Such a data recording / reproducing media device 20 and a tuner device 40 are each provided with each part as shown in FIG.2 and FIG.3.

  That is, as shown in FIG. 2, the data recording / reproducing media device 20 includes a recording / reproducing control unit 21 that controls the operation of recording and / or reproducing data with respect to the recording medium, and the change of data recorded on the recording medium. A data detection unit 22 serving as detection means, an IEEE 1394 interface (hereinafter abbreviated as IEEE 1394 I / F) 23 for interfacing data with the outside, and each unit are controlled and non-continuous information data described later is generated. And a control microcomputer 24 having a function as a generating means.

  The recording / playback control unit 21 controls data recording and / or playback operations on a recording medium such as a tape or a disk under the control of a control microcomputer 24 described later. That is, the recording / reproducing control unit 21 controls, for example, the operation of a tape that is a recording medium, the reproduction operation such as reproduction of data recorded on the recording medium and variable speed reproduction, and the stop of data being reproduced. In addition, a control signal for controlling the stop operation such as pause and the recording operation such as data recording to the recording medium and temporary recording stop is received from the control microcomputer 24, and the operation of the recording medium is controlled.

  The data detection unit 22 detects a transition of data recorded on the recording medium such as a boundary between different data or a boundary between analog data and digital data, and transmits the detection result to the control microcomputer 24.

  The IEEE 1394 I / F 23 transfers data as a bit string of an electric signal between the link IC 25 that performs processing such as data packet division and packetization of the packetized data, and the link IC 25 and the IEEE 1394 serial bus 60. And a physical layer 26.

  The link IC 25 temporarily stores data to be recorded / reproduced, a change-over switch 27 that is switched depending on whether data to be reproduced from the recording medium is muted, a switch 28 that is switched according to whether data is to be recorded or reproduced. By doing so, the memory 29 serving as a buffer for inserting discontinuity information table (hereinafter, abbreviated as DIT) of data described later received from the control microcomputer 24 into the data, and the recording medium Interfaces between the 1394 packetizing unit 30 that packetizes the reproduced data into MPEG-TS, the 1394 unpacketizing unit 31 that unpacks MPEG-TS received from the outside, and the physical layer 26 that is a physical layer And a physical I / F 32.

  The IEEE 1394 I / F 23 receives the MPEG-TS transmitted from the outside via the IEEE 1394 serial bus 60, processes the data recorded on the recording medium, and sends it to the IEEE 1394 serial bus 60 as MPEG-TS. Send to the outside.

  The control microcomputer 24 controls the recording / reproduction control unit 21, the data detection unit 22, and the IEEE 1394 I / F 23 described above. That is, the control microcomputer 24 controls the recording / reproduction control unit 21 by transmitting a control signal for controlling the operation of the recording medium described above. Further, the control microcomputer 24 receives the result of detecting the data transition from the data detection unit 22. Further, the control microcomputer 24 controls the changeover switches 27 and 28 according to the operation mode, and determines a data transmission, reception or simultaneous transmission / reception state and transmits a control signal for data input / output control to the memory 29. And control. Furthermore, the control microcomputer 24 controls the memory 29 by transmitting a control signal for erasing data held in the memory 29 and a DIT inserted into the data. In addition, the control microcomputer 24 applies to the 1394 packetization unit 30 and the 1394 unpacketization unit 31 in accordance with connection management according to IEC (International Electrotechnical Commission) 61883 according to the determined transmission / reception direction. Control signals for connection control for managing logical connection and disconnection between devices.

  Such a data recording / reproducing media device 20 receives MPEG-TS from the outside via the IEEE 1394 serial bus 60, performs the above-described various processes, records the data on the recording medium, and records the data on the recording medium. The data is reproduced and subjected to various processes, and the obtained MPEG-TS is transmitted to the outside via the IEEE 1394 serial bus 60.

  On the other hand, as shown in FIG. 3, the tuner device 40 separates the IEEE 1394 I / F 41 for interfacing data with the outside and the multiplexed data received from the outside into a plurality of signals and sets the time axis of the data Demultiplexer 42 having a function as a detecting means for detecting a change point, decoder 43 for decoding received data, and tuning of data received via another communication medium such as digital satellite broadcast instead of IEEE 1394 serial bus 60 A tuning unit 44 that is a tuning means for selecting a signal, a changeover switch 45 that selects and connects the demultiplexer 42 and the tuner unit 44 according to the operation mode, and controls each unit, and the DIT that is the discontinuous information data described above And a control microcomputer 46 having a function as a generating means for generating .

  The IEEE 1394 I / F 41 performs processing such as a physical layer 47 that transfers data as a bit string of an electrical signal between the link IC 48 and the IEEE 1394 serial bus 60, data packet division, and packetized data unpacketization. Link IC 48 to be applied.

  The link IC 48 includes a physical I / F 49 that is an interface with the physical layer 47 that is a physical layer, a 1394 packetizing unit 50 that packetizes data received by the tuner unit 44 into MPEG-TS, and an IEEE 1394 serial bus 60. 1394 unpacketizing unit 51 that unpacks MPEG-TS received from the outside via the RS, and the role of a buffer for inserting the received DIT into the data by temporarily storing the received data Depending on whether the data received via the IEEE 1394 serial bus 60 is decoded or the data received by the tuner unit 44 is output to a monitor or speaker (not shown), a VTR that handles analog data (not shown), or the outside Switching A switch 53, and a changeover switch 54 which is switched by whether to mute the data received by the data or the tuner unit 44 receives via the IEEE1394 serial bus 60.

  The IEEE 1394 I / F 41 receives the MPEG-TS transmitted from the outside via the IEEE 1394 serial bus 60, processes the data received by the tuner unit 44, and sends it to the IEEE 1394 serial bus 60 as an MPEG-TS. Send to.

  The demultiplexer 42 separates multiplexed data received from the outside into a plurality of signals. Then, the demultiplexer 42 detects a data transition such as a boundary between different data obtained by separation or a boundary between analog data and digital data, and transmits the detection result to the control microcomputer 46.

  The decoder 43 decodes the data separated by the demultiplexer 42.

  The tuner unit 44 receives data via other communication media such as satellite broadcasting and performs tuning. The tuner unit 44 performs tuning control under the control of the control microcomputer 46.

  The changeover switch 45 selects and connects the demultiplexer 42 and the tuner unit 44 under the control of the control microcomputer 46 and switches the data path. That is, the changeover switch 45 is connected to the demultiplexer 42 when decoding data received via the IEEE 1394 serial bus 60. The changeover switch 45 is connected to the tuner unit 44 when data received by the tuner unit 44 is output to a monitor, a speaker, a VTR, or the outside.

  The control microcomputer 46 controls the above-described IEEE 1394 I / F 41, the demultiplexer 42, the decoder 43, and the tuner unit 44. That is, the control microcomputer 46 is for connection control for managing logical connection and disconnection between devices with respect to the 1394 packetizing unit 50 and the 1394 unpacketizing unit 51 in accordance with connection management according to IEC61883. Control by sending a control signal. The control microcomputer 46 transmits a control signal for erasing data held in the memory 52 and a DIT inserted into the data to the memory 52 for control. Further, the control microcomputer 46 decodes the data received via the IEEE 1394 serial bus 60 with respect to the memory 52 and the changeover switches 45 and 53 or sends the data received by the tuner unit 44 to a monitor, a speaker, a VTR, or the outside. A control signal for changing the operation mode is transmitted and controlled in accordance with whether it is output, and a control signal for controlling whether or not to mute these data is transmitted to the changeover switch 54 for control. Furthermore, the control microcomputer 46 receives the result of detecting the data transition from the demultiplexer 42 and transmits a control signal for tuning control to the tuner unit 44 to control it.

  Such a tuner device 40 receives MPEG-TS from the outside via the IEEE 1394 serial bus 60 and performs the various processes described above, and performs various processes on the data received by the tuner unit 44 and obtains the obtained MPEG- TS is output to a monitor, speaker, VTR or outside.

  In the IEEE 1394 network 10, when the control microcomputer 24 and the control microcomputer 46 of the data recording / playback media device 20 and the tuner device 40 change the time axis and service of the contents with respect to the memories 29 and 52, the DIT described above. And insert this DIT into the data. The DIT is a type of service information defined by a DVB (Digital Video Broadcasting) system that is European digital broadcasting. The DIT has a 1-bit flag called “transition_flag” (hereinafter abbreviated as “tf”) as syntax.

  tf indicates the type of state transition in MPEG-TS. If tf is 1, it indicates that a state transition has occurred because the source data in MPEG-TS has changed. This change in source data can be a change in the MPEG-TS itself, and can also be a change in position in the MPEG-TS, as in the case of a time shift, for example. That is, if tf is 1, it indicates that the source data is discontinuous. Also, if tf is 0, it indicates that the state transition has occurred due to a change of selection only. That is, the data stays in the same TS at the same position and is continuous.

  A method of inserting such a DIT into data will be described separately when a DIT is to be inserted.

  First, as a case where the DIT is inserted into the data and transmitted, there is a case where the DIT recorded on the recording medium is being reproduced. Specifically, for example, when a DIT accompanying a discontinuous MPEG-TS recorded on the recording medium of the data recording / reproducing media device 20 is being reproduced.

  In such a case, the tuner device 40 inserts a DIT when switching the channel for the unpacketized data received from the data recording / reproducing media device 20 via the IEEE 1394 serial bus 60.

  In addition, as a case where data should be transmitted with DIT inserted, there is a time when data output is started. Specifically, for example, the data recording / reproducing media device 20 changes the operation mode from the stop state (Stop) to the reproduction state (playback; PB) and starts outputting data recorded on the recording medium. .

  In such a case, an operation mode in the data recording / reproducing media device 20, a digital input / output mode (hereinafter referred to as a DIF mode) in a portion where connection management of the data recording / reproducing media device 20 is performed, data recording / reproducing. The time change of the control signal for mute control and the MPEG-TS packet sent from the control microcomputer 24 of the media device 20 to the switch 27 is represented by a timing chart as shown in FIG. That is, when the DIF mode changes from input (IN) to output (OUT), the data recording / reproducing media device 20 is abbreviated as its own output plug (Output Plug Control Register; hereinafter referred to as oPCR) which is a logical entry / exit of data. The broadcast connection counter (hereinafter referred to as Bcc) or the point-to-point connection counter (hereinafter referred to as Pcc) in FIG. The connection state is assumed. Then, the data recording / reproducing media device 20 inserts one DIT of tf = 1 before canceling the mute. Note that Empty in the figure indicates an empty packet.

  In this case, the start of data output in the connection state is also included. Specifically, for example, when the data recording / reproducing media device 20 is dubbing, the operation mode is changed from the stop state to the reproduction state, and output of data recorded on the recording medium is started.

  Even in such a case, the data recording / reproducing media device 20 inserts one DIT of tf = 1 before canceling the mute.

  Such a series of processing in the data recording / reproducing media device 20 is as shown in FIG. That is, in step S1, the data recording / reproducing media device 20 transmits a control signal from the control microcomputer 24 to the switch 27 so that data is not input to the IEEE 1394 I / F 23, and the mute is turned on and the control is performed. A control signal is transmitted from the microcomputer 24 to the memory 29 in the IEEE 1394 I / F 23 to clear the data held in the memory 29.

  Next, in step S2, the data recording / reproducing media device 20 has the operation mode paused (Pause) or, for example, playback pause (PBpause), fast winding (Cue), fast rewinding (Review), slow playback ( It is determined whether or not a variable speed reproduction state such as (Slow).

  If the data recording / reproducing media device 20 is in the paused state or the variable speed state, it is determined in step S5 whether Bcc or Pcc is 1 or more in the oPCR, that is, whether it is in a connected state. Determine whether or not.

  Here, when both Bcc and Pcc are 0 in the oPCR, the data recording / reproducing media device 20 proceeds to the process of step S7.

  On the other hand, if Bcc or Pcc is 1 or more in the oPCR, the data recording / reproducing media device 20 proceeds to the process of step S6.

  If the data recording / reproducing media device 20 determines in step S2 that it is not in the pause state or the variable speed state, it determines in step S3 whether both Bcc and Pcc are 0 in oPCR.

  Here, if Bcc or Pcc is 1 or more in the oPCR, the data recording / reproducing media device 20 proceeds to the process of step S6.

  On the other hand, if both Bcc and Pcc are 0 in the oPCR, the data recording / reproducing media device 20 adds 1 to Bcc or Pcc in the oPCR in step S4.

  In step S6, the data recording / reproducing media device 20 transmits a DIT of tf = 1 from the control microcomputer 24 to the memory 29, and inserts the DIT into the data.

  In step S7, the data recording / reproducing media device 20 transitions to the reproduction state, and in step S8, the control microcomputer 24 transmits a control signal to the switch 27 so that the data is input to the IEEE 1394 I / F 23. The mute is turned off, and the series of processes is terminated.

  The data recording / reproducing media device 20 does not insert a DIT when the DIF mode is output and its own oPCR is set to Bcc = 0 or Pcc = 0 by remote control.

  Through such a series of processing, the data recording / reproducing media device 20 inserts the DIT at the timing described above. The data recording / reproducing media device 20 packetizes the data in which the DIT is inserted in the 1394 packetizing unit 30 and outputs the packetized data as MPEG-TS to the outside via the IEEE 1394 serial bus 60.

  On the other hand, the tuner device 40 receives the MPEG-TS transmitted from the data recording / reproducing media device 20, performs a series of processes as shown in FIG.

  That is, in the tuner device 40, as shown in the figure, in step S11, the control microcomputer 46 turns on the muting of the input stage and the output stage of the decoder 43 and a D / A (Digital to Analog) converter (not shown). To stop the abnormal video and audio output processing, and to instruct the input stage and output stage of the demultiplexer 42 to turn on mute so that an abnormal stream is not input. To.

  Next, in step S <b> 12, the tuner device 40 transmits a control signal from the control microcomputer 46 to the memory 52 in the IEEE 1394 I / F 41 to clear data held in the memory 52. Here, if there is a memory (not shown) used by each unit of the tuner device 40 for data processing or the like, the memory is also cleared.

  Further, in step S13, the tuner device 40 sets data necessary for returning from the initialization or pause state of each unit as necessary.

  In step S14, the tuner device 40 instructs the control microcomputer 46 to set the input stage of the demultiplexer 42 to the mute OFF state, and the 1394 unpacketizing unit 51 inputs the packet unpacketized. After detecting the incoming stream's sync byte, make sure that the stream is entering stably.

  Further, in step S15, the tuner device 40 instructs the control microcomputer 46 to turn off the muting of the output stage of the demultiplexer 42 and the output stage of the decoder 43, and the stream input to the decoder 43. Make sure that is decoded stably.

  Then, in step S16, the tuner device 40 instructs the output stage of the decoder 43 and the input stage and output stage of the D / A converter to be in a mute OFF state, such as a monitor, a speaker, or a VTR. Data is output again to the connected electronic device, and normal video and audio playback is resumed.

  By doing so, the tuner device 40 can appropriately decode data under the control of the control microcomputer 46, and each unit such as the demultiplexer 42 and the decoder 43 will not hang up. Abnormal sound that displays a noise image or destroys the speaker is not output.

  Next, a description will be given of a case where data output is stopped as a case where data should be transmitted with DIT inserted. Specifically, for example, the data recording / reproducing media device 20 changes the operation mode from the reproduction state to the stop state.

  In such a case, an operation mode in the data recording / reproducing media device 20, a DIF mode in the data recording / reproducing media device 20, a control signal for mute control sent from the control microcomputer 24 of the data recording / reproducing media device 20 to the switch 27, MPEG The time change of the TS packet is represented by a timing chart as shown in FIG. That is, when the DIF mode is input from the output, the data recording / playback media device 20 sets the DIT of tf = 1 to 1 before setting Bcc> 0 or Pcc> 0 in its oPCR after setting mute. Insert one.

  In this case, the data output is stopped when the connection is established. Specifically, for example, the operation mode is changed from the reproduction state to the stop state while the data recording / reproduction media device 20 is dubbing.

  Even in such a case, the data recording / reproducing media device 20 inserts one DIT of tf = 1.

  Such a series of processes in the data recording / reproducing media device 20 is as shown in FIG. That is, in step S21, the data recording / reproducing media device 20 transmits a control signal from the control microcomputer 24 to the switch 27 to turn on mute so that data is not input to the IEEE1394 I / F 23, and control is performed. A control signal is transmitted from the microcomputer 24 to the memory 29 in the IEEE 1394 I / F 23 to clear the data held in the memory 29.

  Next, in step S22, the data recording / reproducing media device 20 determines whether the operation mode is a reproduction state.

  If not in the playback state, the data recording / playback media device 20 determines in step S26 whether or not Bcc or Pcc is 1 or more in the oPCR, that is, whether or not the connection state is established.

  Here, if both Bcc and Pcc are 0 in the oPCR, the data recording / reproducing media device 20 proceeds to the process of step S28.

  On the other hand, if Bcc or Pcc is 1 or more in the oPCR, the data recording / reproducing media device 20 subtracts 1 from Bcc or Pcc in the oPCR in step S27.

  If the data recording / reproducing media device 20 determines that the reproduction state is in step S22, the data recording / reproduction media device 20 determines whether Bcc or Pcc is 1 or more by oPCR in step S23.

  Here, if both Bcc and Pcc are 0 in the oPCR, the data recording / reproducing media device 20 proceeds to the process of step S28.

  On the other hand, if Bcc or Pcc is 1 or more in the oPCR, the data recording / reproducing media device 20 transmits a DIT of tf = 1 from the control microcomputer 24 to the memory 29 in step S24. Insert into the data.

  The data recording / reproducing media device 20 subtracts 1 from Bcc or Pcc in the oPCR in step S25.

  Then, after the data recording / reproducing media device 20 transitions to the stop state in step S28, the control microcomputer 24 transmits a control signal to the switch 27 in step S29 so that the data is input to the IEEE 1394 I / F 23. In addition, the mute is turned off, and the series of processing ends.

  In the data recording / reproducing media device 20, such processing can be applied even when the operation mode transitions from the reproduction state to the fast-winding state or the fast-rewinding state.

  Through such a series of processing, the data recording / reproducing media device 20 inserts the DIT at the timing described above. The data recording / reproducing media device 20 packetizes the data into which the DIT indicating that the data being reproduced has been inserted is packetized in the 1394 packetizing unit 30 and outputs the data as MPEG-TS to the outside via the IEEE 1394 serial bus 60. Output.

  The tuner device 40 that has received the MPEG-TS performs a series of processes as shown in FIG. 6 and reproduces data. In this way, the tuner device 40 can appropriately decode data under the control of the control microcomputer 46, and the demultiplexer 42, the decoder 43, etc. also in the transition from the sudden reproduction state to the stop state. Each part of the system does not hang up, and noise images are not displayed or abnormal sounds that destroy the speaker are not output.

  Next, a description will be given of data output hijacking based on a connection rule according to IEC61883, which is cited as a case where DIT should be inserted into data. Here, a case where the data recording / reproducing media device 20 takes over and outputs the default channel used by the tuner device 40 will be described.

  In such a case, the operation mode of the data recording / reproducing media device 20, the DIF mode of the data recording / reproducing media device 20, the BPCR of the oPCR of the tuner device 40, and the time change of the MPEG-TS packet are as shown in FIG. It is represented by a timing chart. That is, the data recording / reproducing media device 20 sets the Bcc of the oPCR of the tuner device 40 from 1 to 0, and further sets the Bcc or Pcc of its own oPCR from 0 to 1. Then, the data recording / reproducing media device 20 inserts one DIT of tf = 1 before canceling the mute.

  Such a series of processes in the data recording / reproducing media device 20 is as shown in FIG. That is, in step S31, the data recording / reproducing media device 20 transmits a control signal from the control microcomputer 24 to the switch 27 so that the data is not input to the IEEE1394 I / F 23 and the mute is turned on and the control is performed. A control signal is transmitted from the microcomputer 24 to the memory 29 in the IEEE 1394 I / F 23 to clear the data held in the memory 29.

  Next, in step S32, the data recording / reproducing media device 20 sets the operation mode to the reproduction / output state.

  The data recording / reproducing media device 20 sets the Bcc of the oPCR of the tuner device 40 from 1 to 0 in step S33.

  Further, the data recording / reproducing media device 20 sets Bcc or Pcc of its own oPCR from 0 to 1 in step S34.

  In step S35, the data recording / reproducing media device 20 transmits a DIT of tf = 1 from the control microcomputer 24 to the memory 29, and inserts the DIT into the data.

  In step S36, the data recording / reproducing media device 20 transmits a control signal from the control microcomputer 24 to the switch 27, turns off the mute so that data is input to the IEEE1394 I / F 23, and performs a series of processing. finish.

  Through such a series of processing, the data recording / reproducing media device 20 inserts two DITs into the data at the timing described above, packetizes the data in the 1394 packetizing unit 30, and MPEG-TSs through the IEEE1394 serial bus 60. Output to the outside.

  The tuner device 40 that has received the MPEG-TS performs a series of processes as shown in FIG. 6 and reproduces data. By doing so, the tuner device 40 can appropriately decode the data under the control of the control microcomputer 46, and each part such as the demultiplexer 42 and the decoder 43 hangs up even in case of a sudden service change. No abnormal noise is displayed and noise is not displayed or the speaker is destroyed.

  Next, a case where the MPEG-TS output from the data recording / reproducing media device 20, which is cited as a case where DIT should be inserted into data, cannot be adapted to variable speed reproduction will be described.

  In such a case, the data recording / reproducing media device 20 inserts a DIT when the mechanical mode transitions to the variable speed reproduction state, and outputs mute packets with muting during variable speed reproduction. Specifically, when the data recording / playback media device 20 transitions from a normal playback state to a variable speed playback state such as playback pause, fast-winding, fast-rewinding, and slow playback, the DIT of tf = 1 is set to 1. Insert into the data. On the other hand, the data recording / reproducing media device 20 also stores one DIT of tf = 1 when the transition from the variable speed reproduction state such as reproduction pause, fast winding, fast rewinding, and slow reproduction to the normal reproduction state is made. Insert into. However, in the data recording / reproducing media device 20, it is not necessary to insert a DIT when transitioning from the variable speed reproduction state such as reproduction pause, fast-winding, fast-rewinding, slow reproduction to the stopped state.

  Such a series of processes in the data recording / reproducing media device 20 is as shown in FIG. That is, in step S41, the data recording / reproducing media device 20 transmits a control signal from the control microcomputer 24 to the switch 27 to turn on mute so that data is not input to the IEEE1394 I / F 23, and control is performed. A control signal is transmitted from the microcomputer 24 to the memory 29 in the IEEE 1394 I / F 23 to clear the data held in the memory 29.

  Next, in step S42, the data recording / reproducing media device 20 determines whether the operation mode is the reproduction state.

  Here, in the reproduction state, in step S46, the data recording / reproducing media device 20 determines whether or not Bcc or Pcc is 1 or more in the oPCR, that is, whether or not the connection state is established. .

  Here, if both Bcc and Pcc are 0 in the oPCR, the data recording / reproducing media device 20 proceeds to the process of step S48.

  On the other hand, if Bcc or Pcc is 1 or more in the oPCR, the data recording / reproducing media device 20 transmits a DIT of tf = 1 from the control microcomputer 24 to the memory 29 in step S47. Is inserted into the data, and the process proceeds to step S48.

  If the data recording / reproducing media device 20 determines in step S42 that the recording / reproducing media apparatus 20 is not in the reproduction state but in the stopped state, it determines in step S43 whether Bcc or Pcc is 1 or more by oPCR.

  Here, if both Bcc and Pcc are 0 in the oPCR, the data recording / reproducing media device 20 proceeds to the process of step S48.

  On the other hand, if Bcc or Pcc is 1 or more in the oPCR, the data recording / reproducing media device 20 transmits a DIT of tf = 1 from the control microcomputer 24 to the memory 29 in step S44. Insert into the data.

  Further, in step S45, the data recording / reproducing media device 20 subtracts 1 from Bcc or Pcc in the oPCR.

  In step S48, the data recording / reproducing media device 20 transitions to the variable speed reproduction state. In step S49, the data recording / reproducing media device 20 transmits a control signal from the control microcomputer 24 to the switch 27, and the data is input to the IEEE 1394 I / F 23. As described above, the mute is turned off, and the series of processing ends.

  Note that, in the data recording / reproducing media device 20, such processing can also be applied when the operation mode transitions to the pause state.

  Through such a series of processing, the data recording / reproducing media device 20 inserts the DIT at the timing described above. The data recording / reproducing media device 20 packetizes the data in which the DIT is inserted in the 1394 packetizing unit 30 and outputs the packetized data as MPEG-TS to the outside via the IEEE 1394 serial bus 60.

  The tuner device 40 that has received the MPEG-TS performs a series of processes as shown in FIG. 6 and reproduces data. In this way, the tuner device 40 can appropriately decode data under the control of the control microcomputer 46, and the demultiplexer 42 and the transition to the sudden variable speed reproduction state or the pause state can be performed. Each unit such as the decoder 43 does not hang up, and an abnormal sound that displays a noise image or destroys the speaker is not output.

  Next, a description will be given of a case in which there is a change in the content that can be cited as a case where DIT should be inserted into data and transmitted. Specifically, for example, the digital contents of the program A and the program B such as two different programs are continuously recorded on the data recording / reproducing media device 20 such as inheritance of MPEG contents or overwrite recording of MPEG contents. When it is recorded on the medium.

  In such a case, the MPEG contents recorded on the recording medium of the data recording / reproducing media device 20 and the time change of the MPEG-TS packet, and the mute control sent from the control microcomputer 24 of the data recording / reproducing media device 20 to the switch 27. These control signals are each represented by a timing chart as shown in FIG. That is, the data recording / reproducing media device 20 inserts one DIT of tf = 1 when transitioning from the program A to the program B.

  In addition, the data recording / reproducing media device 20 can record both digital content and analog content, for example, when the transition of the MPEG content on the recording medium is a boundary between the content and the unrecorded portion, or D-VHS. In addition, the DIT is inserted even when the boundary between the digital content and the analog content when the recording portions of these contents are mixed.

  In such a case, the MPEG contents recorded on the recording medium of the data recording / reproducing media device 20 and the time change of the MPEG-TS packet, and the mute control sent from the control microcomputer 24 of the data recording / reproducing media device 20 to the switch 27. These control signals are each represented by a timing chart as shown in FIG. In other words, the data recording / reproducing media device 20 reproduces a DIT of tf = 1 when reproducing from a portion where digital content is recorded on a recording medium to an unrecorded portion or a portion where analog content is recorded. Insert one. Further, the data recording / reproducing media device 20 performs a DIT of tf = 1 when reproducing from a non-recorded portion or a portion where analog content is recorded on a recording medium to a portion where digital content is recorded. Insert one.

  A series of processing in such a data recording / reproducing media device 20 is as shown in FIG. That is, in step S51, the data recording / reproducing media device 20 transmits a control signal from the control microcomputer 24 to the switch 27 to turn on mute so that data is not input to the IEEE1394 I / F 23, and control is performed. A control signal is transmitted from the microcomputer 24 to the memory 29 in the IEEE 1394 I / F 23 to clear the data held in the memory 29.

  Next, in step S52, the data recording / reproducing media device 20 determines whether there is a change in digital content.

  If there is a change in digital content, the data recording / reproducing media device 20 transmits a DIT of tf = 1 from the control microcomputer 24 to the memory 29 in step S56, and inserts this DIT into the data. Then, the process proceeds to step S57.

  On the other hand, if there is no change in the digital content, the data recording / reproducing media device 20 continuously records in the recording medium from the digital content portion to the unrecorded portion or the analog content portion in step S53. It is determined whether or not.

  Here, in the case where recording is continuously performed from the digital content portion to the unrecorded portion or the analog content portion, the data recording / reproducing media device 20 sends the data from the control microcomputer 24 to the memory 29 in step S55. Then, the DIT of tf = 1 is transmitted, this DIT is inserted into the data, and the process proceeds to step S57.

  On the other hand, also in the case where recording is continuously performed from the unrecorded portion or the analog content portion to the digital content portion, the data recording / reproducing media device 20 transmits the data from the control microcomputer 24 to the memory 29 in step S54. A DIT with tf = 1 is transmitted, and this DIT is inserted into the data.

  In step S57, the data recording / reproducing media device 20 transmits a control signal from the control microcomputer 24 to the switch 27, turns off the mute so that data is input to the IEEE 1394 I / F 23, and performs a series of operations. End the process.

  Through such a series of processing, the data recording / reproducing media device 20 inserts the DIT into the data at the above-mentioned timing according to the transition of the MPEG content, packetizes it in the 1394 packetizing unit 30, and converts it into MPEG-TS as IEEE 1394. Output to the outside via the serial bus 60.

  The tuner device 40 that has received the MPEG-TS performs a series of processes as shown in FIG. 6 and reproduces data. By doing so, the tuner device 40 can appropriately decode the data under the control of the control microcomputer 46, and each part such as the demultiplexer 42 and the decoder 43 hangs up even in case of a sudden service change. No abnormal noise is displayed and noise is not displayed or the speaker is destroyed.

  Next, a description will be given of data recording start time and data recording stop time, which can be cited as cases where DIT should be inserted into data and transmitted. Specifically, for example, the data recording / reproducing media device 20 changes the operation mode from the stop state to the recording state, or changes the operation mode from the recording state to the stop state.

  In such a case, when recording data on the recording medium, the data recording / reproducing media device 20 first records one DIT of tf = 1, and then starts data recording. In addition, when the data recording / reproducing media device 20 stops or temporarily stops recording data on the recording medium, the data recording / reproducing media device 20 records one DIT of tf = 1 at the end of the recorded data, Transition to the pause state.

  By performing such processing, the data recording / reproducing media device 20 inserts the DIT at the timing described above. When reproducing the data, the data recording / reproducing media device 20 packetizes the data in the 1394 packetizing unit 30 and outputs the packetized data as MPEG-TS to the outside via the IEEE 1394 serial bus 60.

  The tuner device 40 that has received the MPEG-TS performs a series of processes as shown in FIG. 6 and reproduces data. By doing so, the tuner device 40 can appropriately decode data under the control of the control microcomputer 46, and each unit such as the demultiplexer 42 and the decoder 43 will not hang up. Abnormal sound that displays a noise image or destroys the speaker is not output.

  As described above, the data recording / reproducing media device 20 inserts DIT into the data in accordance with the operation mode and content change. Needless to say, these processes can also be applied to the tuner device 40.

  In addition, the tuner device 40 changes the service received by the tuner unit 44 via, for example, a satellite or a cable to a different selected service, and outputs the service stream to the IEEE 1394 serial bus 60. , DIT is inserted into the data.

  That is, the tuner device 40 transmits a DIT from the control microcomputer 46 to the memory 52 and inserts it into the data in response to a change in service received by the tuner unit 44. The tuner device 40 packetizes the data into which the DIT has been inserted by the 1394 packetizing unit 50 and outputs the packetized data as MPEG-TS on the IEEE 1394 serial bus 60.

  By doing so, when the data recording / reproducing media device 20 receives the MPEG-TS, the data recording / reproducing media device 20 records stable data on the recording medium under the control of the control microcomputer 24. can do.

  As described above, in the IEEE 1394 network 10 shown as the embodiment of the present invention, it is possible to avoid hang-up of an electronic device that receives data by inserting DIT into the data. Therefore, the user does not experience an annoying image such as a noise image or an abnormal sound that destroys the speaker.

  In addition, by applying the present invention, it is possible to determine operation method guidelines related to the DIT, such as the timing of inserting the DIT described above.

  The present invention is not limited to the above-described embodiments. For example, not only an IEEE 1394 network but also a network constructed by a digital serial bus such as a so-called Ethernet (registered trademark) or USB (Universal Serial Bus). It can also be applied to.

  Further, the present invention is not applicable only to the data recording / reproducing media device 20 and the tuner device 40 described above, and can transmit and receive MPEG-TS, for example, a home appliance having an external communication function or a computer. Electronic devices can also be applied.

  Furthermore, the present invention can also be directed to MPEG viewer equipment that processes received DITs.

  In addition, it goes without saying that the present invention can be modified as appropriate without departing from the spirit of the present invention.

  As described above in detail, the data transmission method according to the embodiment of the present invention is a data transmission method for performing data transmission / reception on a network constructed by connecting a plurality of electronic devices via a serial bus interface, When the time axis of the content of data to be recorded and / or reproduced on the medium changes, this data is received when this data is output to the outside by inserting discontinuous information data into the data It is possible for electronic devices to know that the time axis of the data content is changing, and it is possible to prevent each part from hanging up, display a noise image, and destroy the speaker It is also possible to avoid outputting an abnormal sound that would cause

  The data transmission method according to the embodiment of the present invention is a data transmission method for transmitting and receiving data on a network constructed by connecting a plurality of electronic devices by a serial bus interface, and is a communication different from the serial bus interface. When the time axis of the content of data received from the outside via the medium changes, this data is output to the outside via the serial bus interface by inserting discontinuous information data into the data. The electronic device that has received the data can know that the time axis of the data content has changed. Therefore, the data transmission method according to the present invention can avoid the hang-up of each part of the electronic device that has received the data, and the abnormal sound that displays the noise image or destroys the speaker. Can also be avoided.

  Furthermore, an electronic device according to an embodiment of the present invention is an electronic device that performs data transmission / reception over a network constructed by connecting a plurality of electronic devices through a serial bus interface, and that stores data stored in a recording medium. When the data is output to the outside in order to insert the discontinuous information data generated by the generating means into the data when the time axis of the data content changes, the generating means for generating the continuous information data is provided. In addition, other electronic devices that have received this data can know that the time axis of the data content has changed, so that each part can be prevented from hanging up, and a noise image can be displayed. It is also possible to avoid outputting an abnormal sound that displays or destroys the speaker.

  Furthermore, an electronic device according to an embodiment of the present invention is an electronic device that transmits and receives data on a network constructed by connecting a plurality of electronic devices through a serial bus interface, and is a communication medium different from the serial bus interface. And receiving means for synchronizing data received from the outside via a serial bus interface and / or generating means for generating discontinuous information data of data received via the tuning means. When the time axis of the data content changes, the discontinuous information data generated by the generating means is inserted into the data, so when this data is output to the outside via the serial bus interface, this data is The receiving electronic device knows that the time axis of the data content is changing. Can. Therefore, the electronic device according to the present invention makes it possible to avoid the hang-up of each part of the electronic device that has received the data, and displays a noise image or destroys the speaker. It is also possible to avoid outputting abnormal sounds.

It is a block diagram explaining the structure of the IEEE1394 network shown as embodiment of this invention. It is a block diagram explaining the structure of the data recording / reproducing media apparatus on the IEEE1394 network. It is a block diagram explaining the structure of the tuner apparatus on the IEEE1394 network. It is a timing chart regarding DIT insertion in case a data recording / reproducing media apparatus changes from a stop state to a reproduction state. It is a flow chart explaining a series of processes at the time of inserting DIT when a data recording / reproducing media device changes from a stop state to a reproduction state. It is a flowchart explaining a series of processes in a tuner device when receiving a stream in which a DIT is inserted. It is a timing chart regarding DIT insertion when the data recording / reproducing media device transitions from a reproduction state to a stop state. It is a flow chart explaining a series of processes at the time of inserting DIT when a data recording / reproducing media device changes from a reproduction state to a stop state. It is a timing chart regarding DIT insertion when a data recording / reproducing media device hijacks and outputs a used channel. 10 is a flowchart for explaining a series of steps when a DIT is inserted when a data recording / reproducing media device hijacks and outputs a channel used by a tuner device. 10 is a flowchart for explaining a series of steps in a data recording / reproducing media device when a DIT is inserted when a stream output from the data recording / reproducing media device cannot support variable speed reproduction. It is a timing chart regarding DIT insertion in the case where two different digital contents are continuously recorded on a recording medium of a data recording / reproducing media apparatus. 10 is a timing chart regarding DIT insertion when digital content, analog content, and an unrecorded portion are mixedly recorded on a recording medium of a data recording / reproducing media device. 10 is a flowchart for explaining a series of steps in a data recording / reproducing media device when a DIT is inserted when digital content, analog content, and an unrecorded part are mixedly recorded on the recording medium of the data recording / reproducing media device. .

Explanation of symbols

  10 IEEE 1394 network, 20 data recording / reproducing media device, 21 recording / reproducing control unit, 22 data detecting unit, 23, 41 IEEE 1394 I / F, 24, 46 control microcomputer, 40 tuner device, 42 demultiplexer, 43 decoder, 44 tuner unit, 60 IEEE1394 serial bus

Claims (4)

An electronic device that converts data into MPEG (Moving Picture Experts Group) data packets and transmits them as a transport stream when performing data transmission / reception on a network constructed by connecting a plurality of electronic devices,
Tuning means for tuning data received from outside via a communication medium different from the network interface;
Detecting means for detecting an operation mode switching point, a time change, a content change, and a digital content change as a change of data received via the network interface and / or the tuning means;
Control means for generating and controlling DIT (Discontinuity Information Table) as discontinuous information data of data received via the network interface and / or the tuning means,
The control means, in turn detected by the detecting means of the data of the content data received through the tuning means, electronic apparatus for inserting controlling the DIT.   The electronic apparatus according to claim 1, wherein the transport stream into which the DIT is inserted is transmitted according to an IEEE (Institute of Electrical and Electronics Engineers) 1394 standard. A data transmission method for converting data into a MPEG (Moving Picture Experts Group) data packet and transmitting it as a transport stream when performing data transmission / reception on a network constructed by connecting a plurality of electronic devices,
Detecting a data change in the content of data received from the outside via a communication medium different from the network interface, and inserting a DIT as discontinuous information data into the data at the detected data change. A data transmission method for inserting and transmitting the DIT when an operation mode switching point, a time change, a content change, and a digital content change are detected as a change of the data. 4. The data transmission method according to claim 3 , wherein the transport stream into which the DIT is inserted is transmitted according to IEEE (Institute of Electrical and Electronics Engineers) 1394 standard.

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