JP3731078B2 - Network system, music recording device, recording operation continuation method, and recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a network system in which a plurality of electronic devices are connected by an IEEE (Institute of Electrical and Electronics Engineers) 1394 bus or the like, and in particular, abnormal communication is interrupted on the network. The present invention relates to a network system, a network device, a recording operation continuation method, and a recording medium that can appropriately continue a recording operation even when it occurs.
[0002]
[Prior art]
In a conventional integrated stereo set or the like, an amplifier, a tuner, a cassette recorder, a CD (compact disc) player, an MD (mini disc) recorder, and the like are physically integrated and installed in a predetermined room. For this reason, the user can easily instruct the MD recorder or the like to perform a recording operation such as recording the music reproduced by the CD player with the MD recorder by operating a predetermined operation panel.
Also, if recording fails due to some trouble during this recording operation, the user can easily resume the recording operation by re-setting the MD player etc. after removing the cause of the trouble. It was. In addition, since a stereo set or the like that is not an integral type is generally arranged in the same room, the user can see all the devices almost simultaneously, and can easily deal with troubles.
[0003]
In recent years, an IEEE 1394 bus has been developed as a digital interface standard for connecting a plurality of electronic devices such as video cameras, audio products, and personal computers to construct a network system. The IEEE 1394 bus has features such as high data transfer speed and high expandability, and is thus being adopted in many home electronic devices. Also, by constructing a network system using the IEEE 1394 bus, each connected device can be handled as if it were an integrated device.
[0004]
[Problems to be solved by the invention]
A characteristic function of the IEEE 1394 bus is that it supports hot plug-in and plug-and-play functions that allow the connected devices to be connected and disconnected while the devices are powered on. This function makes it possible to change the installation location of the device, remove the device, or connect a new device during system operation. That is, the user can change the configuration and arrangement of the system at any opportunity.
[0005]
In such a case, a bus reset occurs in the network system (IEEE 1394 bus), and the network is reconstructed. During this period (from bus reset to reconfiguration), the IEEE 1394 bus is used for transmission and reception of predetermined information necessary for reconfiguration, and normal communication between the devices is interrupted. The bus reset is a normal operation defined by the IEEE 1394 standard. Therefore, each device has a function of covering communication (transmission / reception of information required for normal operation) that is interrupted during this period.
For example, if a bus reset occurs during the recording operation of recording a predetermined music piece from a CD player constituting the network to the MD recorder, the CD player can be transferred to the MD recorder until the network is reconstructed. Transmission of music data will be interrupted. Still, since a predetermined amount of music data is stored in the buffer provided in the MD recorder or the like, the recording operation can be continued without causing a problem such as sound interruption.
[0006]
However, if the bus reset continues for a long time for some reason, or if the CD player or the like is removed during network reconstruction, a recording error occurs and the recording operation ends abnormally.
In this case, if the CD player and the MD recorder are arranged in the same room, the user can easily notice abnormal termination or the like, and can easily take countermeasures by operating each device. . However, when these devices are arranged in different rooms, it is often the case that the user is not aware of the abnormal termination, or the countermeasures are not easy even if they notice. That is, the user has to go to each room where the respective devices are arranged, reset the devices, etc., and then instruct the recording operation again, which is very cumbersome.
[0007]
The present invention has been made in view of the above circumstances, and a network system, a network device, and a recording operation continuation method capable of appropriately continuing a recording operation even when abnormal communication interruption occurs on the network And a recording medium.
[0008]
[Means for Solving the Problems]
  In order to achieve the above object, a network system according to the first aspect of the present invention provides:
  Music playeras well asMusic recording equipmentA network system in which a plurality of electronic devices including the above are connected via a bus compliant with the IEEE 1394 interface standard,
  Music playerIs
  Music recording equipmentSent fromRegenerationCommand receiving means for receiving commands;
  Received by the command receiving meansRegenerationAccording to the commandPlay musicDataMusic recording equipmentData transmission means for transmitting to
  Music recording equipmentIs
  Sent from the data transmission meansRegenerationData receiving means for receiving data;
  Received by the data receiving meansRegenerationSequentially transfer data to a given mediumrecordingDorecordingMeans,
  Detecting means for detecting a bus reset generated on the bus;
  When the bus reset was detected by the detecting means, the data receiving means was receivingRegenerationTo identify the dataSong numberStorage means for storing
  Determining means for determining whether or not the bus reset detected by the detecting means is normally completed within a predetermined time;
  When the determining means determines that the bus reset has been illegally terminated, the information is stored in the storage means.Song numberAccording to the subjectPlay back to the beginning of the songA command to instruct data retransmissionMusic playerCommand transmission means for transmitting to
  It is characterized by that.
[0010]
  The music recording device stops the recording by the recording unit when the determining unit determines the illegal end of the bus reset, and from the data transmitting unit according to the command transmitted by the command transmitting unit.TargetWhen the data receiving means receives the reproduction data to be retransmitted after returning to the beginning of the music, the recording by the recording means is performed.TargetYou may further provide the control means to restart from the beginning of a music.
[0011]
  the aboveMusic recording equipmentWhen the bus reset detected by the detecting means is completed, the network systemMusic playerAn exclusion detection means for detecting that the
  The exclusion detecting meansMusic playerAnd a notification means for notifying the abnormality of the network system when the exclusion is detected.
[0012]
  In order to achieve the above object, according to a second aspect of the present inventionMusic recording equipmentIs
  A music recording device having a bus conforming to the IEEE 1394 interface standard,
Data receiving means for receiving reproduction data sent from a music reproducing device for reproducing a predetermined music;
  Recording means for sequentially recording the reproduction data received by the data receiving means on a predetermined medium;
  Detecting means for detecting a bus reset generated on the bus;
  Storage means for storing a music number for specifying the reproduction data received by the data receiving means when a bus reset is detected by the detecting means;
  Determining means for determining whether or not the bus reset detected by the detecting means is normally completed within a predetermined time;
  When the determining means determines that the bus reset has ended improperly, command transmitting means for transmitting to the music playback device a command for returning to the beginning of the target music and instructing retransmission of the playback data according to the music number stored in the storage means ,
  It is characterized by providing.
[0013]
  The music recording device stops the recording by the recording unit when the determining unit determines the illegal end of the bus reset, and from the data transmitting unit according to the command transmitted by the command transmitting unit.TargetWhen the data receiving means receives the reproduction data to be retransmitted after returning to the beginning of the music, the recording by the recording means is performed.TargetYou may further provide the control means to restart from the beginning of a music.
  The music recording device includes an exclusion detecting unit that detects that the music reproducing device is excluded from the network when the bus reset detected by the detecting unit is completed.
  When the exclusion detection unit detects the exclusion of the music playback device, the exclusion detection unit may further include a notification unit that notifies the abnormality of the network.
[0014]
  In order to achieve the above object, according to a third aspect of the present inventionRecording operation continuation methodIs
  A recording operation continuation method in a network system in which a plurality of electronic devices including a music playback device and a music recording device are connected via a bus compliant with the IEEE 1394 interface standard,
  A command receiving step of receiving a playback command sent from the music recording device at the music playback device;
  A data transmission step of transmitting reproduction data of a predetermined music piece to a music recording device according to the reproduction command received in the command reception step;
  A data receiving step of receiving the playback data sent in the data sending step at a music recording device;
  A recording step of sequentially recording the reproduction data received in the data reception step on a predetermined medium;
  A detection step for detecting a bus reset occurring on the bus;
  When a bus reset is detected in the detection step, a music number acquisition step for acquiring a music number for specifying the reproduction data received in the data reception step;
  A determination step of determining whether or not the bus reset detected in the detection step is normally completed within a predetermined time;
  If it is determined in the determining step that the bus reset has been terminated improperly, a command for returning to the beginning of the target music and instructing the retransmission of the playback data is transmitted to the music playback device according to the music number acquired in the music number acquisition step. A command sending step;
  It is characterized by providing.
[0018]
  In order to achieve the above object, according to a fourth aspect of the present inventionrecoding mediaIs
  A recording medium storing a program for causing a computer to execute a recording operation continuation method in a network system in which a plurality of electronic devices including a music reproducing device and a music recording device are connected via a bus compliant with the IEEE 1394 interface standard. ,
  A command receiving step of receiving a playback command sent from the music recording device at the music playback device; and a data transmission step of transmitting playback data of a predetermined music to the music recording device according to the playback command received at the command receiving step; A data reception step for receiving the playback data sent in the data transmission step at a music recording device; a recording step for sequentially recording the playback data received in the data reception step on a predetermined medium; A detection step for detecting a bus reset, and a song number acquisition step for acquiring a song number for specifying the reproduction data received in the data reception step when a bus reset is detected in the detection step And the bus reset detected in the detection step ends normally within a predetermined time. If the determination step determines whether or not the bus reset has been illegally terminated, it returns to the beginning of the target song according to the song number acquired in the song number acquisition step and resends the playback data. A program for causing a computer to execute a recording operation continuation method including a command transmission step of transmitting an instructing command to a music playback device is recorded.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
A network system according to an embodiment of the present invention will be described below with reference to the drawings.
[0024]
FIG. 1 is a schematic diagram showing an example of the configuration of a network system according to an embodiment of the present invention, and a plurality of electronic devices are connected using an IEEE 1394 bus.
In the network system shown in FIG. 1, a CD-ROM 11, a computer 12, an MD recorder 13, an amplifier 14, and a CD player 15 are connected via an IEEE 1394 cable 16.
[0025]
Each device (CD-ROM 11 to CD player 15) constituting the network system is arbitrarily divided and arranged in a plurality of rooms. As shown in the figure, a CD-ROM 11 and a computer 12 are arranged in the room A, an MD recorder 13 is arranged in the room B, and an amplifier 14 and a CD player 15 are arranged in the room C.
[0026]
Since the IEEE 1394 bus can be connected by daisy chain, node branching, etc., the electronic equipment constituting the network system and its connection form are arbitrary, and are not limited to those shown in FIG. They can be connected in any combination.
[0027]
FIG. 2 is a block diagram for explaining a control unit provided in common to each device constituting the network system according to the embodiment of the present invention. That is, the control unit shown in FIG. 2 is provided in common for the CD-ROM 11 to the CD player 15. However, FIG. 2 shows only the portions necessary for the description of the present embodiment.
[0028]
The control unit shown in FIG. 2 includes a management unit 1, an ID storage unit 2, an operation storage unit 3, a command storage unit 4, a timer counter 5, a state storage unit 6, a data buffer 7, and an interface unit. 8.
[0029]
The management unit 1 includes a control program for managing the operation of each device including itself, and stores predetermined data in the ID storage unit 2 to the data buffer 7 or is stored in the ID storage unit 2 to the data buffer 7. A predetermined command is transmitted to each device using the received data.
For example, when recording the music to be played back by the CD player 15 with the MD recorder 13, the management unit 1 of the MD recorder 13 uses a Rec manager (control program for recording operation) as a CD to send predetermined commands and the like necessary for the recording operation. Transmit to the player 15.
[0030]
The ID storage unit 2 stores a unique ID that is information for identifying a device to be controlled. For example, when recording music to be played back by the CD player 15 with the MD recorder 13, a unique ID for identifying the CD player 15 is stored in the ID storage unit 2 of the MD recorder 13.
[0031]
The operation storage unit 3 stores operation contents to be executed by itself, for example, operation contents such as recording, video recording, and reproduction.
[0032]
The command storage unit 4 stores information transmitted / received to / from a device to be controlled, information indicating a connection status of each device on a network, and the like. For example, the command storage unit 4 stores commands that the device itself transmits to each device at once.
[0033]
The timer counter 5 counts the time when the operation to be executed is interrupted by a bus reset or the like. For example, when the recording operation performed by the Rec manager is interrupted due to a bus reset, the timer counter 5 of the MD recorder 13 measures the interrupted time.
[0034]
The state storage unit 6 stores its own operation state at the time when the operation to be executed by itself is interrupted by a bus reset or the like. For example, when the recording operation performed by the Rec manager is interrupted, the state storage unit 6 of the MD recorder 13 stores music specifying information for specifying the music currently being recorded.
[0035]
The data buffer 7 temporarily accumulates data transmitted from a device to be controlled or data transmitted by itself. Note that communication required for normal operation (for example, recording operation performed by the MD recorder 13) is interrupted when the bus is reset, but the data buffer 7 covers interruption within a predetermined time when the bus reset ends normally. The amount of data that can be stored.
[0036]
The interface unit 8 constitutes an interface of a predetermined IEEE 1394 bus standard. The interface unit 8 is connected to the interface unit 8 of another device via the IEEE 1394 cable 16 and transmits / receives predetermined data.
[0037]
In such a network system, as an example of the recording operation continuation processing of the present invention, a recording operation when a predetermined music piece to be reproduced by the CD player 15 is recorded by the MD recorder 13 will be described with reference to the drawings.
[0038]
FIG. 3 is a flowchart for explaining a recording process performed by the MD recorder 13 in the embodiment of the present invention. Specifically, the control program (Rec manager) provided in the management unit 1 of the MD recorder 13 executes the recording process shown in FIG. That is, while the Rec manager controls the CD player 15 and the like, the MD recorder 13 records predetermined music on the MD and the like.
[0039]
In the recording process shown in FIG. 3, the user operates the computer 12 or the like placed in the room A to instruct the CD player 15 in the room C to play a predetermined piece of music, and the MD recorder 13 in the room B. Is started when the recording of the music is instructed. The MD, which is a recording medium, is set in advance by the user in the MD recorder 13, and a predetermined CD that is a reproduction target (sound source) is set in the CD player 15.
[0040]
In the recording process shown in FIG. 3, when a recording operation for recording music to be reproduced by the CD player 15 is instructed by the MD recorder 13, the Rec manager stores a unique ID or the like for identifying the CD player 15 ( Step S11). That is, when the CD player 15 is designated as a recording source by the user, the Rec manager stores a unique ID for identifying the CD player 15 in the ID storage unit 2.
[0041]
The Rec manager starts a recording operation (step S12). That is, the Rec manager transmits a “Play command” to the CD player 15 to put the CD player 15 in a playback state. When the Rec manager receives information sent from the CD player 15 indicating that playback has started, the Rec manager starts recording. Thereafter, the MD recorder 13 sequentially records (records) the music data (reproduced audio signal or the like) sent from the CD player 15 on a predetermined MD.
[0042]
The Rec manager determines whether a bus reset has occurred (step S13). That is, the Rec manager determines whether or not a bus reset has occurred due to the user connecting another device to the network.
[0043]
If the Rec manager determines that a bus reset has not occurred, the Rec manager advances the processing to step S15 described later. On the other hand, if it is determined that a bus reset has occurred, the Rec manager executes a recording operation continuation process (step S14). That is, the Rec manager executes a recording operation continuation process in order to continue the recording operation appropriately. Details of the recording operation continuation process will be described later.
[0044]
The Rec manager determines whether or not the recording operation is completed after completing the operation continuation process or when it is determined in step S13 that the bus reset has not occurred (step S15). That is, it is determined whether or not the recording operation of the MD recorder 13 is completed, for example, when the reproduction of all the music pieces is completed in the CD player 15.
When the Rec manager determines that the recording operation has not been completed, the Rec manager returns the process to step S13 and repeatedly executes the processes of steps S13 to S15 described above. On the other hand, when it is determined that the recording operation is completed, the recording process is terminated.
[0045]
Hereinafter, the recording operation continuation process executed in step S14 will be described with reference to FIG.
First, the Rec manager stores music specifying information for specifying the music currently being recorded (step S21). That is, the Rec manager stores in the state storage unit 6 music specifying information including the music number (music number) recorded at the time of the bus reset.
[0046]
The Rec manager determines whether the bus reset has been completed (step S22). That is, the Rec manager determines whether or not the network rebuilding due to the bus reset has been completed.
[0047]
If it is determined that the bus reset has not ended, the Rec manager determines whether a predetermined time has elapsed (step S23). That is, the Rec manager determines whether or not a predetermined time required for the bus reset to end normally has elapsed.
[0048]
When it is determined that the predetermined time has not elapsed, the Rec manager returns the process to step S22. On the other hand, if it is determined that the predetermined time has elapsed, the Rec manager determines whether or not the recording operation has been stopped (step S24). That is, the Rec manager determines whether or not the recording operation has been stopped because step S25 described later has already been executed.
[0049]
If the Rec manager determines that the recording operation has been stopped, the Rec manager returns to step S22. On the other hand, if it is determined that the recording operation has not been stopped, the Rec manager stops the recording operation (step S25). That is, the Rec manager stops recording the music, assuming that the bus reset has not ended normally, and returns the recording header to the top area of the music being recorded (the top position of the target music in the MD). Pause the operation.
After stopping the recording operation, the Rec manager returns the process to step S22 and repeatedly executes the processes of steps S22 to S25 described above.
[0050]
If it is determined in step S22 that the bus reset has been completed, the Rec manager determines whether or not a unique ID indicating the CD player 15 exists on the network (step S26). That is, the Rec manager determines whether or not the CD player 15 exists in the reconstructed network according to the unique ID stored in the ID storage unit 2.
[0051]
If it is determined that the unique ID exists, the Rec manager determines whether the recording operation is stopped (step S27). That is, it is determined whether or not the recording operation is stopped in the above-described step S25, assuming that the bus reset has not ended normally.
[0052]
If the Rec manager determines that the recording operation is not stopped, that is, if the bus reset ends normally within a predetermined time, the Rec manager advances the process to step S30 described later. On the other hand, if it is determined that the recording operation is stopped, that is, if the bus reset is not completed within a predetermined time, the Rec manager instructs the CD player 15 to cue the music to be played back (step S28). ). That is, the Rec manager uses the music specifying information stored in the state storage unit 6 to transmit a command instructing the CD player 15 to cue the music (return to the beginning of the music).
[0053]
When the Rec manager receives information from the CD player 15 indicating that the cueing has been completed, the Rec manager releases the pause (pause) of the recording (step S29). That is, after the recording is stopped in the above-described step S25, the Rec manager returns the recording header or the like to a predetermined position and releases the pause that was waiting for the resumption of recording.
[0054]
After canceling the pause or when it is determined in step S27 that the recording operation is not stopped (when the bus reset is normally completed within a predetermined time), the Rec manager discards the music specifying information (step S30). ). That is, the Rec manager deletes the music specifying information such as the music number stored in the state storage unit 6.
[0055]
The Rec manager resumes the recording operation (step S31). That is, a “Play command” is transmitted again to the CD player 15 and music data (reproduced audio signal, etc.) sent from the CD player 15 is sequentially recorded (recorded) on a predetermined MD.
After resuming the recording operation, the Rec manager returns to the recording process shown in FIG.
[0056]
If it is determined in step S26 that the unique ID indicating the CD player 15 does not exist in the network, the Rec manager determines whether or not the recording operation is being performed (step S32). That is, the Rec manager determines whether or not a recording operation is being performed because the bus reset has been completed within a predetermined time.
[0057]
If the Rec manager determines that the recording operation is not being performed, that is, if the recording operation is stopped in step S25 described above, assuming that the bus reset has not ended normally, the process proceeds to step S34 described later. On the other hand, if it is determined that the recording operation is being performed, the Rec manager stops the recording operation (step S33). That is, the Rec manager suspends the recording of the music, assuming that the recording operation cannot be continued as it is, returns the recording header to the head area of the music being recorded (the head position of the target music in the MD), and performs the recording operation. Pause (pause).
[0058]
The Rec manager notifies the user of a network abnormality (step S34). That is, the Rec manager notifies the user of a network abnormality by, for example, displaying a warning message indicating a network abnormality on a predetermined display unit provided in the MD recorder 13 or the like. The notification method is arbitrary, and for example, an alarm sound or the like may be emitted from a predetermined speaker.
[0059]
The Rec manager waits for subsequent processing until the network is restored (step S35). That is, the Rec manager waits for processing until the CD player 15 is recognized on the network, for example, when the user reconnects the CD player 15 to the network.
[0060]
If the Rec manager determines that the network has been restored, the Rec manager proceeds to step S28 described above. Similarly, the processes in steps S28 to S31 described above are executed, and the recording operation is resumed.
[0061]
Thus, even if the bus reset does not end normally within a predetermined time, the Rec manager can continue the recording operation appropriately by controlling the CD player 15 and the like. As a result, the recording operation can be appropriately continued even when abnormal communication interruption occurs on the network.
[0062]
In the present embodiment, the recording operation continuation process when a network trouble occurs during the recording operation from the CD player 15 to the MD recorder 13 has been described. However, applicable devices are limited to the MD recorder 13 and the like. It is optional. For example, the present invention can be similarly applied to a recording operation to a tape deck or the like that can record music on a cassette tape.
Further, the applicable operation is not limited to the recording operation. For example, the present invention can be similarly applied to a recording operation for recording a predetermined moving image reproduced by the computer 12 on a predetermined VCR (video cam recorder) (not shown).
[0063]
In the present embodiment, the management unit 1 (Rec manager) of the MD recorder 13 is the main body and the recording operation is continued. However, the CD player 15 side may be the main body to continue the recording operation. For example, the management unit 1 of the CD player 15 may manage the end time of the bus reset and transmit a recording instruction command to the MD recorder 13 as needed to continue the recording operation.
[0064]
Furthermore, in the present embodiment, a network system using a bus conforming to the IEEE 1394 interface standard has been described. However, the present invention is not limited to this, and the present invention can be used for a home network system for connecting audio / visual devices, computers, and the like. Any bus is acceptable.
[0065]
Note that the electronic device that performs the operation continuation processing of the present invention can be realized by using a normal computer system, without using a dedicated device. For example, by installing the program from a recording medium (such as a floppy disk or a CD-ROM) that records the program for executing the above-described process in a computer, an electronic device that executes the above-described process can be configured.
[0066]
The medium for supplying the program to the computer may be a communication medium (a medium that temporarily and fluidly holds the program, such as a communication line, a communication network, or a communication system). For example, the program may be posted on a bulletin board (BBS) of a communication network and distributed via a predetermined network. The above-described processing can be executed by starting this program and executing it in the same manner as other application programs under the control of an OS (operating system).
[0067]
【The invention's effect】
As described above, the present invention can appropriately continue the recording operation even when abnormal communication interruption occurs on the network.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an example of a configuration of a network system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating an example of a configuration of a control unit provided in common in each electronic device.
FIG. 3 is a flowchart for explaining recording processing according to the embodiment of the present invention;
FIG. 4 is a flowchart for explaining a recording operation continuation process according to the embodiment of the present invention.
[Explanation of symbols]
1 management department
2 ID storage
3 Operation memory
4 Command memory
5 Timer counter
6 State memory
7 Data buffer
8 Interface section
11 CD-ROM
12 computers
13 MD recorder
14 Amplifier
15 CD player
16 IEEE1394 cable

Claims (8)

A network system in which a plurality of electronic devices including a music playback device and a music recording device are connected via a bus compliant with the IEEE 1394 interface standard,
The music playback device
Command receiving means for receiving a playback command sent from the music recording device;
In accordance with a playback command received by the command receiving means, data transmitting means for transmitting playback data of a predetermined music to a music recording device,
Music recording equipment
Data receiving means for receiving reproduction data sent from the data transmitting means;
Recording means for sequentially recording the reproduction data received by the data receiving means on a predetermined medium;
Detecting means for detecting a bus reset generated on the bus;
Storage means for storing a music number for specifying the reproduction data received by the data receiving means when a bus reset is detected by the detecting means;
Determining means for determining whether or not the bus reset detected by the detecting means is normally completed within a predetermined time;
When the determining means determines that the bus reset has ended improperly, command transmitting means for transmitting to the music playback device a command for returning to the beginning of the target music and instructing retransmission of the playback data according to the music number stored in the storage means Comprising
A network system characterized by this. Music recording equipment
When the discriminating means discriminates the abnormal end of the bus reset, the recording data by the recording means is stopped, and the reproduction data which is retransmitted from the data transmitting means to the beginning of the target music according to the command transmitted by the command transmitting means When the data receiving means receives, further comprising a control means for resuming recording by the recording means from the beginning of the target music,
The network system according to claim 1. Music recording equipment
When the bus reset detected by the detection means is completed, an exclusion detection means for detecting that the music playback device is excluded from the network system;
A notification means for notifying the abnormality of the network system when the exclusion detection means detects the exclusion of the music playback device;
The network system according to claim 1 or 2, characterized in that A music recording device having a bus conforming to the IEEE 1394 interface standard,
Data receiving means for receiving reproduction data sent from a music reproducing device for reproducing a predetermined music;
Recording means for sequentially recording the reproduction data received by the data receiving means on a predetermined medium;
Detecting means for detecting a bus reset generated on the bus;
Storage means for storing a music number for specifying the reproduction data received by the data receiving means when a bus reset is detected by the detecting means;
Determining means for determining whether or not the bus reset detected by the detecting means is normally completed within a predetermined time;
When the determining means determines that the bus reset has ended improperly, command transmitting means for transmitting to the music playback device a command for returning to the beginning of the target music and instructing retransmission of the playback data according to the music number stored in the storage means ,
A music recording device comprising: When the discriminating means discriminates the abnormal end of the bus reset, the recording data by the recording means is stopped, and the reproduction data which is retransmitted from the data transmitting means to the beginning of the target music according to the command transmitted by the command transmitting means When the data receiving means receives, further comprising a control means for resuming recording by the recording means from the beginning of the target music,
The music recording device according to claim 4, wherein: When the bus reset detected by the detection means is completed, an exclusion detection means for detecting that the music playback device is excluded from the network;
A notification means for notifying the abnormality of the network when the exclusion detection means detects the exclusion of the music playback device;
The music recording device according to claim 4 or 5, characterized in that A recording operation continuation method in a network system in which a plurality of electronic devices including a music playback device and a music recording device are connected via a bus compliant with the IEEE 1394 interface standard,
A command receiving step of receiving a playback command sent from the music recording device at the music playback device;
A data transmission step of transmitting reproduction data of a predetermined music piece to a music recording device according to the reproduction command received in the command reception step;
A data receiving step of receiving the playback data sent in the data sending step at a music recording device;
A recording step of sequentially recording the reproduction data received in the data reception step on a predetermined medium;
A detection step for detecting a bus reset occurring on the bus;
When a bus reset is detected in the detection step, a music number acquisition step for acquiring a music number for specifying the reproduction data received in the data reception step;
A determination step of determining whether or not the bus reset detected in the detection step is normally completed within a predetermined time;
If it is determined in the determining step that the bus reset has been terminated improperly, a command for returning to the beginning of the target music and instructing the retransmission of the playback data is transmitted to the music playback device according to the music number acquired in the music number acquisition step. A command sending step;
A recording operation continuation method characterized by comprising: A recording medium storing a program for causing a computer to execute a recording operation continuation method in a network system in which a plurality of electronic devices including a music reproducing device and a music recording device are connected via a bus compliant with the IEEE 1394 interface standard. ,
A command receiving step of receiving a playback command sent from the music recording device at the music playback device; and a data transmission step of transmitting playback data of a predetermined music to the music recording device according to the playback command received at the command receiving step; A data reception step for receiving the playback data sent in the data transmission step at a music recording device; a recording step for sequentially recording the playback data received in the data reception step on a predetermined medium; A detection step for detecting a bus reset, and a song number acquisition step for acquiring a song number for specifying the reproduction data received in the data reception step when a bus reset is detected in the detection step And the bus reset detected in the detection step ends normally within a predetermined time. If the determination step determines whether or not the bus reset has been illegally terminated, it returns to the beginning of the target song according to the song number acquired in the song number acquisition step and resends the playback data. A computer-readable recording medium having recorded thereon a program for causing a computer to execute a recording operation continuation method including a command transmission step of transmitting a command to instruct to a music playback device.

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