JP2007088593A - Data transmission apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow reproduction of audio and video synchronously through the adjustment of timing deviation by a user even if the reproduction timing is deviated between the audio and the video at an external apparatus side when the video and the audio are transmitted to the connected external apparatus via a digital interface. <P>SOLUTION: In response to the operating mode of the main body of a digital video camera, the configuration of sub units provided in the main body is changed, dynamically switching a response with respect to a SUBUNIT_INFO command. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to control of a digital interface in an electronic device having an IEEE1394 digital interface.

  Some electronic devices having an IEEE1394 digital interface can be controlled by “Function Control Protocol” (abbreviated as FCP) defined in IEC61883. The FCP defines a communication flow of commands for controlling the electronic device, and transmits a command to the command register address (FFFF F0000B00h) and receives a response to the response register address (FFFF F0000D00h). The command and response are defined as a command set for each function. The function of controlling each command exists as a subunit that logically exists in the electronic device, and the command set is defined for each subunit. In addition, an electronic device logically having a subunit needs to have an indispensable command set defined by “AVC Digital Interface Command Set general specification” (abbreviated as AVC General). Each electronic device can logically have a plurality of subunits therein. A first electronic device having IEEE1394 is connected to an external second electronic device also having IEEE1394 by IEEE1394, and the second electronic device uses the FCP to control the first electronic device. It is necessary to know the subunits that the first electronic device has. In order for the second electronic device to recognize the subunit that the first electronic device has logically, a SUBUNIT_INFO command defined in the AVC General command set is used. The first electronic device that has received the SUBUNIT_INFO command notifies the subunit that it has confidence in as a SUBUNIT_INFO response.

Moreover, as a prior art example, patent document 1, patent document 2, and patent document 3 can be mention | raise | lifted, for example.
JP 2001-352511 A JP 2004-187088 A JP 2002-510923 A

  For example, in the case of a digital video camera, a VCR subunit for VCR control, a camera subunit for camera control, a second storage medium other than tape, for example, a camera storage subunit for controlling a memory card, etc. Have Generally, a digital video camera switches the mode of the main body to a shooting mode, a VCR playback mode, a card playback mode, etc. according to the purpose of use. In the case of such a digital video camera having a plurality of subunits, there are subunits that can be used and functions that are limited in the operation mode of the main body. For example, the camera control commands can be used in the shooting mode, but the VCR control commands are limited, the camera control commands are limited in the playback mode, and the command for controlling the second storage medium. Can only be used for playing cards. In such a case, when the digital video camera receives the SUBUNIT_INFO command from the control device when connected to an external control device by 1394, the digital video camera sets the VCR subunit, camera subunit, and camera storage subunit. To the control device as a SUBUNIT_INFO response. The control device can display icons for the user to control each subunit, that is, a VCR icon, a camera icon, a storage media icon, and the like on the display device of the control device by the received SUBUNIT_INFO response. Specifically, when the user clicks each icon, for example, when a VCR icon is selected, a control panel on which a play button, a stop button, a special play button, etc. for VCR control are arranged is displayed. For example, when a camera icon is selected, a control panel in which commands for controlling zoom, focus, white balance, etc. for camera control are arranged, and when a storage media icon is selected, A control panel on which buttons for obtaining data and a list of data from the second storage medium of the digital video camera are arranged is displayed. However, when the main body mode is the shooting mode, the second storage medium cannot be controlled. Therefore, even if the storage medium icon is selected, the user cannot control the storage medium. Such a user interface is inconvenient for the user.

  In the present invention, in order to solve the above-described problem, the configuration of the subunits of the main body is switched according to the operation mode of the digital video camera main body, and the response to SUBUNIT_INFO is dynamically switched. For example, only when the operation mode of the digital video camera body is the card playback mode, if the camera storage subunit is notified to the connected control device as a response to SUBUNIT_INFO, the operation mode of the digital video camera body is the shooting mode. Sometimes, the control device does not display the storage media icon on the display device, and the user can easily know which functions can be used. However, when the mode of the digital video camera body is switched while the digital video camera and the control device are connected, for example, when the digital video camera body switches from the card playback mode to the shooting mode, the switching is performed. Since the means for notifying the control device is not defined, the control device continues to display the storage medium icon even though the second storage medium cannot be controlled. For example, if the control device continues polling transmission of the SUBUNIT_INFO command at regular intervals, the operation mode of the digital video camera body can be recognized and the above-mentioned problems can be avoided, but the traffic of the IEEE1394 bus increases and is not efficient. . Even if the control device transmits a SUBUNIT_INFO command to the digital video camera body every time a bus reset occurs, the above-mentioned problem can be avoided, but there is no guarantee that an electronic device other than the control device performs the same operation. In order to avoid this problem, in the present invention, when the operation mode of the digital video camera body is switched, if IEEE1394 is connected to an external device, the IEEE1394 connection is physically connected. Is connected but not electrically connected. Specifically, this can be realized by reducing the TPA bias of the IEEE1394 interface on the digital video camera side. As a result, the control device recognizes that the digital video camera is connected once and another device is connected, and therefore transmits the SUBUNIT_INFO command again. In this case, since the mode of the digital video camera is the shooting mode, only the VCR subunit and the camera subunit are returned as the SUBUNIT_INFO response, so that the storage media icon which has become unavailable as described above is displayed. This will eliminate the problem and improve the problem.

  As described above, when the configuration of the subunit is changed when the mode of the digital video camera body is changed and the IEEE1394 digital interface is connected, the electrical connection is turned OFF / ON, and the connection destination It is possible to explicitly notify the device that the configuration of the subunit has been changed, and the connected device can present a user interface corresponding to the device, for example, an icon, and an icon of a function that cannot be used to the user. You can avoid the confusion of displaying.

  The digital video camera having the function of the present invention plays back a camera moving image shooting mode when a subject is shot and recorded as a moving image, a camera still image shooting mode when a subject is recorded as a still image, and a shot and recorded moving image. In this case, it operates as a moving image playback mode, and when a captured still image is played back, it operates as a still image playback mode. FIG. 1 shows a state in which the digital video camera (100) is connected to the PC (110) by the IEEE1394 interface (120) when in the moving image reproduction mode. Here, (101) is a unit that logically represents the digital video camera (100), (103) is a camera subunit that logically represents the camera shooting function of the digital video camera (100), and (102) is a digital video camera. A VCR subunit that logically represents the (100) video playback function is represented. As described above, a command set for controlling each subunit is defined, and a command set is defined for the unit (101) in "AVC Digital Interface Command Set general specification". When the digital video camera (100) and the PC (110) are connected, the PC (110) transmits a SUBUNIT_INFO command (FIG. 2) in order to recognize the subunits of the digital video camera (100). In response to this SUBUNIT_INFO command, the digital video camera (100) transmits a SUBUNIT_INFO response (FIG. 3) indicating that it has a camera subunit and a VCR subunit to the PC (110). The PC (110) can recognize the digital video camera (100) from this response and display the digital video camera icon (111) on the screen. 2 and 3 show SUBUNIT_INFO command and response frames. In actuality, values are described in each field and transmitted / received.

Next, the operation flow at the time of switching the mode of the main body will be described with reference to the flowchart of FIG. The flow of FIG. 4 may operate as a periodic process, or may operate as a task process that is woken up by an interrupt trigger when the user switches the main body mode of the digital video camera (100). If switching of the main body mode is detected in step (401), the process proceeds to step (402). If the main body mode is not switched, the flow of FIG. 4 ends. In step (402), the configuration of the subunits of the digital video camera (100) is changed as shown in FIG. Actually, the response content to the SUBUNIT_INFO command is changed. Here, FIG. 5 shows a state where the digital video camera (100) is connected to the PC (110) via the IEEE1394 interface (120) when the operation mode of the main body of the digital video camera (100) is the still image playback mode. Yes. At this time, the digital video camera (100) is recognized by the PC (110) as having a VCR subunit, a camera subunit, and a camera storage subunit as subunits, whereby the PC (110) is recognized as a digital video camera ( 100) Camera storage icons that can control access to still images recorded in the main unit can be displayed. When the mode of the main body of the digital video camera (100) is switched in the connected state, the PC (110) is in a state as shown in FIG. 5 by performing the processing from step (403). The description will be continued along the flow of FIG. Next, in step (403), if it is determined that the digital video camera (100) is already connected to the PC (110) via the IEEE1394 digital interface, the TPA of the IEEE1394 digital interface is determined in step (404). , Turn off the TPA ^* bias. FIG. 6 shows an IEEE1394 digital interface TPA (601) provided in the digital video camera (100) of this embodiment, and a TPA ^* (602) provided in the PC (110) as an IEEE1394 digital interface TPB (611) and TPB ^* ( 612). In the IEEE1394 standard, when a bias is added to TPA (601) and TPA ^* (602), the bias is detected by the comparator (613) connected to TPB and TPB ^* on the PC (110) side, and the connection of the device is detected. Therefore, if the device conforms to IEEE1394, the device is not connected by turning off the bias of TPA (601) and TPA ^* (602), that is, by setting the input voltage to (603) to 0V. Or, suspend or disable. Thereby, the PC (110) recognizes that the connection with the digital video camera (100) by the IEEE1394 digital interface is disconnected. Next, at step (405), the completion of mode transition of the digital video camera (100) main body is monitored. For example, in the transition from the moving image reproduction mode to the still image reproduction mode, it is recognized that the transition of the operation mode is completed after the servo control device such as a tape medium used for moving image reproduction is completely stopped. Here, considering that the completion of the transition of the operation mode is not completed for some reason, the timer may be forcibly shifted to the next step in step (406). When the transition of the main body mode is completed, the process proceeds to step (407), and again, a bias is added to TPA (601) and TPA ^* (602) of the IEEE1394 digital interface, that is, a specified voltage is input from (603). Thereby, the PC (110) recognizes again that the digital video camera (100) is connected. For example, when the main body of the digital video camera (100) is switched from the moving image playback mode to the still image playback mode, the state shown in FIG. 1 is changed to the state shown in FIG. 5, so that the user is recorded on the main body of the digital video camera (100). You can recognize that you can access the still image. Similarly, since the state in FIG. 5 to FIG. 1 is also reversed, the user can recognize that access to the still image recorded in the main body of the digital video camera (100) is impossible.

It is the figure which showed the state in which the digital video camera which mounted the function of this invention was connected with PC at the moving image reproduction mode. This is a SUBUNIT_INFO command frame specified by “AVC Digital Interface Command Set general specification”. This is a SUBUNIT_INFO response frame specified by “AVC Digital Interface Command Set general specification”. It is the figure which showed the operation | movement flow of the function of this invention. It is the figure which showed the state with which the digital video camera which mounted the function of this invention was connected with PC at the time of still picture reproduction mode. It is the figure which showed the electrical connection of the IEEE1394 standard digital interface.

Claims (3)

  In the first electronic device having a plurality of operation modes having different functions depending on each mode, the first electronic device has a digital interface capable of communicating with an external second electronic device, and is connected to the second electronic device via the digital interface. Means for notifying the second electronic device connected by the digital interface of a controllable function, and the controllable function via the digital interface is based on the operation mode of the first electronic device main body. In the means for notifying the second electronic device connected by the digital interface, the content to be notified is changed according to the operation mode of the main body. Each time the operation mode is switched, the digital interface is not electrically connected for a certain period of time, Control method for an interface, characterized by comprising means for reconnecting after between regular.   The first electronic device according to claim 1, the photographing means for photographing the subject as a moving image and a still image, the first recording / reading means for recording and reading the photographed moving image, the first recording The first recording medium on which the moving image is recorded / read by the reading means, the second recording / reading means for recording and reading the captured still image, and the still recording of the still image by the second recording / reading means A second recording medium on which recording / reading is performed, a recorded moving image, a reproducing means for reproducing a still image, a communication means for communicating with an external device, and an IEEE1394 digital interface as the communication means An imaging recording apparatus characterized in that, in imaging mode, when reproducing data recorded in the first recording medium, reproduction A mode when reproducing data recorded in the first recording medium, data recorded in the second recording medium Play When the second electronic device connected via the IEEE1394 digital interface requests notification of a function that can be controlled via the IEEE1394 digital interface. Is a method of controlling an interface, characterized in that the answer is changed depending on each mode. 2. The first electronic device according to claim 1, wherein the digital interface includes IEEE 1394, and means for making the digital interface not electrically connected for a certain period and reconnecting after the certain period elapses is IEEE 1394 digital interface. The interface control method is realized by controlling the bias of TPA and TPA ^* .

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