JP2006228349A - Recording and reproducing device and its reproduction controlling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid occurrence of hang-up of a PC caused by inputting a signal format which is different from the driver read by the PC when the recording and reproducing device having a recording and reproducing function for recording and reproducing signals while a plurality of signal formats are mixed, and a communication function is connected to the PC. <P>SOLUTION: In a video system 500, a cam coder 100 which has a function to receive and transmit video signals and control signals through a communication interface compliant with the IEEE1394 standards, and a PC200 are connected through an IEEE1394 cable 300. The cam coder 100 for recording and reproducing the signals through a recording medium while a plurality of signal formats are mixed, is provided with a reproduction controlling means which identifies the connected party by the establishment of the connection with the PC200, stores the current output signal format and controls the reproduction operation so that only the signals having the stored output signal format are outputted when connected to a computer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording / reproducing apparatus having a recording / reproducing function for recording and reproducing a signal by mixing a plurality of signal formats via a recording medium, and a communication function for establishing a connection with an external device and outputting a reproduced signal, and the same The present invention relates to a playback control method.

  There is an IEEE (Institute of Electrical and Electronics Engineers) 1394 standard as a high-speed serial bus standard that enables connection between digital devices such as digital cameras as well as peripheral devices of personal computers (PCs).

  IEEE 1394 provides a plug-and-play compatible expansion interface for PCs and has an ideal transmission mode that guarantees bandwidth for consumer audio / video (A / V) devices, storage peripherals and portable devices. Up to 63 devices can be daisy chained or tree-connected, and the transfer rates are standardized at 100 Mbps, 200 Mbps, and 400 Mbps. IEEE 1394 is a serial bus that can transfer data at high speed, like SCSI (Small Computer Systems Interface). When this is used, both data and control commands (for example, AV / C commands) are transferred by a single cable by two types of transfer methods called isochronous transfer and asynchronous transfer. be able to. Here, the AV / C command is a command communicated on the IEEE 1394 interface, and the command transmission and the corresponding response are performed based on the IEEE 1394 asynchronous WRITE transaction. In IEEE 1394, devices can be inserted and removed during operation (hot plug), and power can be supplied via a connection cable (see, for example, Patent Document 1).

  Furthermore, a basic specification of the HDV standard that enables recording and reproduction of digital high definition (HD) video using the current DV standard cassette tape has been formulated. The HDV standard supports the 720p (progressive) and 1080i (interlace) formats, compresses video with MPEG2, and records and reproduces HD video with high definition at the same bit rate as using DV standard SD (intraframe compression). It is possible.

JP 2001-359007 A

  By the way, when a device capable of outputting a plurality of signal formats, such as an HDV device, is connected to a PC using the IEEE1394 interface, if the PC receives a signal in a format different from the format selected at the time of connection (driver is read), the PC There was a problem of hanging up.

  In addition, there was an inconvenience for the user, such as being unable to display on the screen when inputting a signal in a format that could not be displayed or recorded without hanging up.

  In a device / system such as a video server, it may be possible to convert the format according to the receiver side and output it.

  In consumer devices such as camcorders, the received signal format is converted and recorded, or the received signal format is recorded as it is. In addition, contents that cannot be digitally output are analogly output, or the amount of bandwidth acquired is changed according to the data rate of the recording signal (MPEG).

  Therefore, in view of the conventional situation as described above, an object of the present invention is to establish a connection with an external device and a recording / reproducing function for recording / reproducing a signal by mixing a plurality of signal formats via a recording medium. In a recording / reproducing apparatus having a communication function for outputting a signal, when connected to a PC, a PC hang-up caused by a signal format different from that of a driver read by the PC being input to the PC is to be avoided.

  Further, it is intended to prevent the output of a signal in a format that cannot be handled by the connected device, such as display / recording, when reproducing media in which content recorded in the same media in a plurality of formats (DV / MPEG, etc.) is mixed. .

  Other objects of the present invention and specific advantages obtained by the present invention will become more apparent from the description of embodiments described below.

  The present invention is a recording / reproducing apparatus having a recording / reproducing function for recording and reproducing a signal by mixing a plurality of signal formats via a recording medium, and a communication function for establishing a connection with an external device and outputting a reproduced signal. The connection partner recognized by establishing the connection with the external device is identified, and when the connection partner is a computer, the current output signal format is stored, and only the signal of the stored output signal format is output. And a playback control means for controlling the playback operation.

  The present invention also relates to a recording / reproducing apparatus having a recording / reproducing function for recording and reproducing a signal by mixing a plurality of signal formats via a recording medium, and a communication function for establishing a connection with an external device and outputting a reproduced signal. In the reproduction control method in the case where a connection partner recognized by establishing a connection with an external device is identified, and when the connection partner is a computer, the current output signal format is stored, and the stored output signal format The reproduction operation is controlled so as to output only the signal.

  In the present invention, for example, when a device capable of outputting a plurality of signal formats such as an HDV device is connected to another device using an IEEE 1394 cable, it is recognized that the connection partner is a PC using an AV / C command or the like. In this case, the current output signal format is stored, and other signals are not output.

  According to the present invention, a recording / reproducing apparatus having a recording / reproducing function for recording and reproducing a signal by mixing a plurality of signal formats via a recording medium, and a communication function for establishing a connection with an external device and outputting a reproduced signal In this case, the PC can be prevented from hanging up due to the change of the output signal format. It is also possible to output in a single signal format when playing media with mixed content recorded in the same media in multiple formats (DV / MPEG etc.), and a format that the connected device cannot handle such as display / recording Since it is possible to prevent the signal from being output, it is easy to handle on the receiving side.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Needless to say, the present invention is not limited to the following examples, and can be arbitrarily changed without departing from the gist of the present invention.

  The present invention is applied to, for example, a video system 500 configured as shown in FIG.

  This video system 500 includes a camcorder 100 and a personal computer (PC) 200 having a function of transmitting and receiving video signals and control signals via a communication interface compliant with the IEEE 1394 standard, which is a high-speed serial bus standard, via an IEEE 1394 cable 300. Connected.

  As shown in the block diagram of FIG. 2, the camcorder 100 complies with the HDV standard for recording and reproducing signals by mixing a plurality of signal formats such as HDV format and DV format via the recording medium 50. A recording / reproducing apparatus having a recording / reproducing function conforming to the above and a communication function conforming to the IEEE 1394 standard for establishing a connection with an external device such as the PC 200 and outputting a reproduction signal, and an imaging unit 10 for photographing a subject, The video signal obtained by the imaging unit 10 is recorded on the recording medium 50, the recording / reproducing unit 20 that reproduces the video signal from the recording medium 50, and the control unit 30 that controls the operation of the imaging unit 10 and the recording / reproducing unit 20. And communication conforming to the IEEE 1394 standard for establishing a connection with an external device such as the PC 200 to exchange control signals and video signals. Consisting of centers face portion 40, and the like.

  The imaging unit 10 includes a camera unit 11 and a camera control unit 12 to which the camera unit 11 is connected. A video signal obtained as an imaging output obtained by imaging the subject by the camera unit 11 is transmitted via the camera control unit 12 to the control unit. 30 signal controllers 33 are supplied.

  The recording / reproducing unit 20 records and reproduces video signals of a plurality of signal formats such as HDV format and DV format supplied from the signal control unit 33 of the control unit 30, and is controlled by the mechanical control unit 21. A mechanical unit 22 is provided, and video signals are recorded and reproduced via a recording medium 50 that is detachably attached to the mechanical unit 22.

  The control unit 30 includes a signal control unit 33 to which an LCD display panel 31 and an electronic viewfinder 32 are connected, an input / output terminal 34 connected to the signal control unit 33, a user I / F processing unit 35, a memory 36, and the like. In accordance with control information given through the user I / F processing unit 35 or the communication interface unit 40, the video signal supplied from the imaging unit 10 is displayed on the monitor by the LCD display panel 31 or the electronic viewfinder 32, The video signal is converted into a video signal of a plurality of signal formats such as HDV format and DV format by the signal control unit 33 and supplied to the recording / reproducing unit 20 and the communication interface unit 40.

  The communication interface unit 40 includes a 1394 processing unit 42 connected to an external device via a 1394 terminal 41.

  The camcorder 100 is an HDV device capable of outputting HDV (MPEG) / DV as described above. As shown in FIG. 3, an example of the mode setting screen is shown in FIG. The DV mode can be set in three types of modes.

  Normally, as shown in FIG. 4A, when an HDV device is recorded on a recording medium 50 in a state where a video signal of HDV (MPEG) format and a video signal of DV mode are mixed, As shown in FIG. 4B, the output is performed according to the recording format recorded on the recording medium 50. In the HDV mode, as shown in FIG. On the contrary, in the DV mode, as shown in FIG. 4D, a DV dummy signal is output at the time of MPEG recording partial reproduction.

  Here, an example of a procedure for discriminating the connection partner from the camcorder 100 and switching its operation mode will be described with reference to the flowchart of FIG.

  The PC 200 repeatedly determines whether or not a 1394 connection has been detected by detecting a bias signal or detecting a bus reset (step S1). When a 1394 connection is detected, a driver is read (step S2) and a connection partner (in this example) It is repeatedly determined whether or not a connection confirmation command sent from the camcorder 100) has been detected (step S3). When a command for connection confirmation is received, a response is transmitted (step S4).

  The control unit 30 of the camcorder 100 repeatedly determines whether or not a 1394 connection has been detected by detecting a bias signal or detecting a bus reset (step S11). When a 1394 connection is detected, a command for confirming the connection is transmitted. (Step S12), it is repeatedly determined whether or not a response sent from the connection partner (PC 200 in this example) has been detected (Step S13). And if the response from a connection other party is detected, the response will be discriminate | determined (step S14) and it will be determined whether a connection other party is PC (step S15).

Here, for example, the following methods 1) to 4) are adopted to determine whether or not the connection partner is a PC.
1) A normal AV device is compatible with an AV / C command, but a PC is not compatible with the AV / C command.
2) Judged from the response of the AV_C command Unit_Info. Command and Subunit_Info. Command. In response to the Unit_Info. Command, if it is a normal AV device, a response such as VTR / Camera / Monitor is returned, but the PC does not return these responses. In response to the Subunit_Info. Command, a response such as VTR + Camera / VTR + Tuner / Monitor + Tuner is returned for a normal AV device, but the PC does not return these responses.
3) Judged from VendorCode described in Configuration ROM or manufacturer name written in ASCII code. As an example, the name of the OS manufacturer is described.
4) If the devices are from the same manufacturer, the device responds to its own VendorDependent command (for example, inquires about the connection partner) and is determined from the response.

  Here, AV / C commands in the IEEE 1394 standard are defined in AV / C Digital Interface Command Set General Specification version 4.0. Configuration ROM is defined in Configuration ROM for AV / C Devices 1.0.

  Then, the camcorder 100 that has recognized that the connection partner is a PC stores the fact that it is in the PC connection state and what format (DV / MPEG etc.) it can output at that time (step S16). , S17).

  The recognition of the PC connection state is held until the next bus reset is detected, and the connected device is recognized again when the bus reset is detected.

  Next, the camcorder 100 determines whether or not it is in the auto mode (step S18). If it is in the auto mode, the camcorder 100 detects a change in the signal format of the reproduction signal (step S19), and the signal of the reproduction signal. If the format has changed, it is determined whether or not it matches the signal format in the current mode stored in step S17 (step S20), and playback / output is performed normally when the recorded portion is played back in the stored format. Is performed (step S21), but a process is performed in which output is not performed during reproduction of a recorded portion in a format different from the stored signal format (step S22).

  Here, as processing for not outputting different format signals, for example, the following methods (A), (B), and (C) are employed as shown in FIGS.

  Method (A) A dummy signal in the selected format is output when a portion recorded in the non-selected format is reproduced.

  That is, as shown in FIG. 6A, when DV is selected, the DV recording portion is played back as usual, and when it is detected that it has entered the MPEG recording portion, the output to the communication interface unit 40 is stopped and necessary. If so, a DV dummy signal is output. Next, when the next DV recording portion is found and detected by fast-forwarding or high-speed reproduction, the normal reproduction is resumed, and the output to the communication interface unit 40 is also resumed. Also, as shown in FIG. 7A, when MPEG is selected, the MPEG recording portion is played back as usual, and when it is detected that it has entered the DV recording portion, the output to the communication interface unit 40 is stopped and necessary. If there is, an MPEG dummy signal is output. Next, when the next MPEG recording portion is found and detected by fast-forwarding or high-speed reproduction, the normal reproduction is resumed, and the output to the communication interface unit 40 is resumed.

  Method (B) The playback of the portion recorded in the non-selected format is skipped (fast forward, fast forward playback, etc.), while the output is stopped or a dummy signal in the selected format is output.

  That is, as shown in FIG. 6B, when DV is selected, the DV recording portion is played back as usual, the MPEG recording portion is skipped, while the output to the communication interface unit 40 is stopped and necessary. For example, a DV dummy signal is output. Next, when the next DV recording portion is found and detected by fast-forwarding or high-speed reproduction, the normal reproduction is resumed, and the output to the communication interface unit 40 is also resumed. Also, as shown in FIG. 7B, when MPEG is selected, the MPEG recording portion is played back as usual, the DV recording portion is skipped, and during that time, output to the communication interface unit 40 is stopped and necessary. For example, an MPEG dummy signal is output. Next, when the next MPEG recording portion is found and detected by fast-forwarding or high-speed reproduction, the normal reproduction is resumed, and the output to the communication interface unit 40 is resumed.

  Method (C) When reproducing the portion recorded in the non-selected format, it is converted into the selected format and output.

  That is, as shown in FIG. 6C, when DV is selected, the DV recording portion is played back as usual, and the MPEG recording portion is converted into the DV format and output. Next, when the DV recording portion is found and detected, normal playback is resumed. As shown in FIG. 7C, when MPEG is selected, the MPEG recording portion is reproduced as usual, and the DV recording portion is converted into the MPEG format and output. When the next MPEG recording portion is found and detected, normal playback is resumed.

  Further, when the auto mode is set when the PC connection is recognized, it is conceivable to shift to a format only mode (DV mode / MPEG mode) that can be output at that time. Further, while it is determined that the PC is connected, it is also possible to prohibit the transition from the format dedicated mode at the time of connection recognition.

  The detection of the recording signal and the change point of the recording format can be discriminated from reading the signal recorded on the recording medium 50 even during fast-forwarding.

  In this way, by preventing signals other than the selected signal from being output to the communication interface unit 40, it is possible to prevent the PC 200 from hanging up.

  As described above, an image formed by connecting the camcorder 100 having a function of transmitting and receiving a video signal and a control signal via the communication interface compliant with the IEEE 1394 standard, which is a high-speed serial bus standard, and the PC 200 via the IEEE 1394 cable 300. In the system 500, the signal format recognized by the camcorder 100 having a recording / reproducing function for recording / reproducing a signal by mixing a plurality of signal formats via the recording medium 50 by establishing the connection with the PC 200 as an external device. After storing and starting playback, stop playback of the playback signal when it reaches a part recorded in a signal format different from the stored format, and skip to the part recorded in the next stored signal format. Playback signal output from the Da 100 when connected to the PC200, can signal format different from the read driver PC200 to avoid PC200 hang by means of inputting the PC200. In addition, the PC 200 can collect contents of a plurality of formats recorded on the recording medium 50 for each same format.

  In this video system 500, the PC 200 is recognized as an MPEG device in the auto mode if it is in a state equivalent to MPEG tape playback at the time of connection by the mode setting of the camcorder 100, and is in a state equivalent to DV tape playback at the time of connection. If it exists, it is recognized as a DV device. In the HDV mode, only an MPEG signal is output, so that it is recognized as an MPEG device. In the DV mode, only a DV signal is output, so that it is recognized as a DV device.

  Here, a specific example of processing for determining whether or not the connection partner is a PC in the camcorder 100 will be described with reference to the flowcharts shown in FIG. 8, FIG. 9, and FIG.

  The flowchart of FIG. 8 shows an example of processing for determination using an existing AV / C command.

  In the process shown in the flowchart of FIG. 8, the Unit_Info. Command is used, and the camcorder 100 transmits the Unit_Info. Command to the connection partner (step S31). The PC 200 determines whether or not a response can be transmitted in response to the Unit_Info. Command sent from the camcorder 100 (step S41), and transmits a response if it can be transmitted (step S42).

  Then, the camcorder 100 determines whether or not a response is sent from the connection partner (step S32). If there is no response from the connection partner, the camcorder 100 waits for a timeout (step S33), and the connection partner is the PC. If it is determined that there is a response (step S36) and a response is sent from the connection partner, the response content indicates an AV device (VTR / Camera / Tuner / Monitor / Disc) compatible with the Unit_Info. Command. It is determined whether or not (step S34). If the response content indicates an AV device compatible with the Unit_Info. Command, the connection partner is recognized as an AV device compatible with the Unit_Info. Command (step S35), and the response content is Unit_Info. If the AV device of the command is not indicated, it is determined that the connection partner is a PC (step S36).

Normally, the AV device is indispensable to support this Unit_Info. Command, so if it does not support this Unit_Info. Command, it can be regarded as a non-AV device, and here it is determined as a PC.
Furthermore, even if the PC supports this Unit_Info. Command, a code indicating its main function is returned as a response to this Unit_Info. Command, so the PC responds with a VTR / Camera / Tuner as a response. Since it is difficult to return / Monitor / Disc or the like, the case where a command other than this is returned is determined to be a PC.

  In this case, you can use SubUnit_Info. Command instead of Unit_Info. Command. In response to this command, codes (VTR / Camera / Tuner / Monitor / Disc, etc.) indicating the functions of the set as a response are enumerated and returned, so the PC from the response is the same as for the Unit_Info. Command. Can be determined.

  Further, the flowchart of FIG. 9 shows a method of reading the Configuration ROM and determining from its contents.

  In the process shown in the flowchart of FIG. 9, the camcorder 100 transmits a Configuration ROM read request to the connection partner and reads the contents of the Configuration ROM of the connection partner (Step S51).

  In response to the read request sent from the camcorder 100, the PC 200 reads the Configuration ROM and sends it to the camcorder 100. When the reading is completed, the PC 200 sends a read response (step S61).

  Then, the camcorder 100 sequentially reads the contents of the configuration ROM of the connection partner, and when reading of the Configuration ROM is completed (step S52), the camcorder 100 determines whether the content of the read configuration ROM of the connection partner has VendorName (step S52). S53), if there is no VendorName, it is determined that the connection partner is a PC (step S55). If there is a VendorName, whether the manufacturer of the set is the OS manufacturer from the ComapnyCode included in the contents of the Configuration ROM. (Step S54), if the manufacturer of the set is an OS manufacturer, it is determined that the connection partner is a PC (step S55). If the manufacturer of the set is not an OS manufacturer, the connection partner is It is recognized as an AV device (step S56).

  In the case of a PC, the operating system (OS) manufacturer name is often described as the manufacturer of the set. The flowchart of FIG. 9 shows an example in the case of determination by VendorName. In FIG. 9, the contents are analyzed after reading out the Configuration ROM. However, it is conceivable that the contents are analyzed while being read and only the contents necessary for discrimination are read out. Whether or not all of the Configuration ROM has been read can be determined by, for example, returning a read response to the read request with an address error.

  The flowchart of FIG. 10 shows an example in which a new command is defined and a connection partner is determined from a response to the command.

  In the processing shown in the flowchart of FIG. 10, a vendor-dependent command is used so that a single command can be used to inquire whether the set category and format control on the transmission side are necessary.

  That is, the camcorder 100 transmits a vendor-dependent command to the connection partner (step S71), and if there is a response response from the connection partner for the transmitted command (step S81), whether or not the content of the response indicates a PC. (Step S72), if the response content does not indicate a PC, the connection partner is recognized as an AV device (step S73), and if the response content indicates a PC, the connection is established. It is determined that the other party is a PC (step S74), and it is further determined whether format management is necessary (step S75). If format management is necessary, the output format is controlled (step S75). S76) If format management is not required, the output format is not controlled (step S77).

  In the process shown in the flowchart of FIG. 10, it is possible not only to determine whether the connection partner is a PC, but also to determine whether the output signal format needs to be controlled. When the signal is unnecessary, it is possible not to control the output signal.

  An example of commands used in the processing shown in the flowchart of FIG. 10 is shown in FIG. In the VnedorDependent command addressed to the unit of the AV / C command, CommandType is a Status (status inquiry) command. Further, XX indicates a connection partner discrimination command, YY indicates a category (VTR / PC, etc.) of the connection partner, ZZ indicates “0” indicating that format control is not required, and “1”. This indicates that there is a possibility of malfunction if format control is not performed.

  In this example, when the device that has received this command does not support this command, it returns 0x08 (Not Implemented) as a response, and the corresponding device returns 0x0C (Stable). If it is supported, the data category that follows further indicates the category of the set (VTR / Monitor / Tuner / PC, etc.) and whether the set can handle multiple signal formats, that is, whether output format control is required on the output side. I try to answer. For new commands, by defining the details of the response further, for example, if a signal with a different format is input, it will not be displayed correctly even if it does not hang up. Can also be able to do.

It is a block diagram which shows the structure of the video system to which this invention is applied. It is a block diagram which shows the principal part structure of the camcorder in the said video system. It is a figure which shows the example of the mode setting screen in the said camcorder. It is a figure which shows the example of an output in each mode reproduced | regenerated from the recording medium in the said camcorder. In the above video system, it is a flowchart showing a procedure of processing when a connection partner is discriminated from a camcorder and its own operation mode is switched. In the above video system, it is a diagram showing a specific example at the time of DV selection of processing that does not output different format signals from the camcorder when DV is selected. In the said video system, it is a figure which shows the specific example at the time of MPEG selection of the process which does not output a different format signal from a camcorder. 6 is a flowchart showing a processing procedure for determining whether or not a connection partner is a PC using an existing AV / C command in the camcorder. 6 is a flowchart showing a processing procedure for reading out the Configuration ROM and determining whether or not the connection partner is a PC from the contents in the camcorder. It is a flowchart which shows the example which discriminate | determines a connection other party from the response with respect to the command using a new vendor dependence command. It is a figure which shows an example of a vendor dependence command.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Imaging part, 11 Camera part, 12 Camera control part, 20 Recording / reproducing part, 21 Mechanical control part, 22 Mechanical part, 30 Control part, 31 LCD display panel, 32 Electronic viewfinder, 33 Signal control part, 34 Input / output terminal , 35 User I / F processing unit, 36 Memory, 40 Communication interface unit, 41 1394 terminal, 42 1394 processing unit, 50 Recording medium, 100 Camcorder, 200 Personal computer (PC), 300 IEEE 1394 cable, 500 Video system

Claims (14)

A recording / reproducing apparatus having a recording / reproducing function for recording and reproducing a signal by mixing a plurality of signal formats via a recording medium, and a communication function for establishing a connection with an external device and outputting a reproduced signal,
Recognizes the connection partner recognized by establishing a connection with an external device, stores the current output signal format when the connection partner is a computer, and plays back only the stored output signal format signal A recording / reproducing apparatus comprising reproduction control means for controlling operation.   The reproduction control means identifies a connection partner for an external device connected via an IEEE (Institute of Electrical and Electronics Engineers) 1394 bus by an AV / C command in the IEEE 1394 standard. 1. The recording / reproducing apparatus according to 1.   3. The recording / reproducing apparatus according to claim 2, wherein the reproduction control means identifies a connection partner from a response of the Unit_Info. Command or Subunit_Info. Command of the AV / C command.   2. The recording / reproducing apparatus according to claim 1, wherein the reproduction control means reads the contents of the Configuration ROM of the external device with which the connection has been established, and identifies the connection partner from the manufacturer name included in the contents of the Configuration ROM.   2. The recording / reproducing apparatus according to claim 1, wherein the reproduction control means performs control to output a dummy signal when a portion recorded in a signal format different from the stored format is applied.   The playback control means stops the output of the playback signal when it reaches a portion recorded in a signal format different from the stored format, skips to the portion recorded in the next stored signal format, and from there the playback signal The recording / reproducing apparatus according to claim 1, wherein control for starting output of the recording is performed.   The playback control means performs control for converting a playback signal into a stored signal format and outputting it when a portion recorded in a signal format different from the stored format is applied after starting playback. Item 4. The recording / reproducing apparatus according to Item 1. This is a playback control method in a recording / playback apparatus having a recording / playback function for recording and playback of signals by mixing a plurality of signal formats via a recording medium, and a communication function for establishing a connection with an external device and outputting a playback signal. And
Identify the connection partner recognized by establishing a connection with an external device,
When the connection partner is a computer, the current output signal format is stored,
A reproduction control method characterized by controlling a reproduction operation so as to output only a signal of a stored output signal format.   9. The reproduction control method according to claim 8, wherein an external device connected via an IEEE (Institute of Electrical and Electronics Engineers) 1394 bus is identified by an AV / C command according to the IEEE 1394 standard. .   10. The playback control method according to claim 9, wherein a connection partner is identified from a response of the Unit_Info. Command or Subunit_Info. Command of the AV / C command.   9. The reproduction control method according to claim 8, wherein the content of the Configuration ROM of the external device with which the connection has been established is read, and the connection partner is identified from the manufacturer name included in the content of the Configuration ROM.   9. The reproduction control method according to claim 8, wherein control is performed to output a dummy signal when a portion recorded with a signal format different from the stored format is applied.   Control that stops outputting the playback signal when it reaches a part recorded in a signal format different from the stored format, skips to the part recorded in the next stored signal format, and starts output of the playback signal from there The reproduction control method according to claim 8, wherein: 9. The reproduction control according to claim 8, wherein after the reproduction is started, a reproduction signal is converted into a stored signal format and output when a portion recorded in a signal format different from the stored format is applied. Method.

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