JP3861916B1 - Image transmission / reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AV amplifier capable of outputting image data at a resolution that can be processed by a display device but having a resolution that is not stored in the AV amplifier.
An AV amplifier 20 conforms to the HDMI standard, and an HDMI receiving unit 21, an HDMI transmitting unit 22, a PROM 25 for storing a type of resolution read by a DVD player 10, and a type of resolution are stored in advance. ROM 23a, and a system control unit 23 that reads from the display device 30 the type of resolution stored in advance in the display device 30. When the system control unit 23 determines that the display device 30 is compliant with the DVI standard, the system control unit 23 registers all of the resolution types read from the display device 30 in the PROM 34.
[Selection] Figure 2

Description

  The present invention relates to an image transmission / reception apparatus that registers, in a storage unit, a resolution type that can be output by an image reproduction apparatus based on a resolution type read from the image display apparatus and a resolution type stored in advance in the image display apparatus. .

  Conventionally, as shown in FIG. 5A, a system in which a DVD player, an AV amplifier, and a display device compliant with the HDMI (High Definition Multimedia Interface) standard are connected via an HDMI cable has been proposed. Image data reproduced by the DVD player is output to a display device via an AV amplifier.

  The display device can display images of a plurality of resolutions, and the displayable resolution types (for example, XGA) are stored in advance in a PROM (not shown) provided internally as EDID (Extended Display Identification Data). (For example, patent document 1).

  The AV amplifier also stores in advance a resolution type (these resolutions correspond to the HDMI standard) in a ROM provided therein. The AV amplifier reads the EDID from the connected display device, and reads the type of resolution that can be displayed by the display device from the EDID. The AV amplifier registers an EDID including a resolution that matches the resolution read from the display device among a plurality of resolutions stored in advance in its own ROM in a PROM (not shown).

  The DVD player reads the EDID from the PROM of the AV amplifier and analyzes the type of resolution stored in common by the AV amplifier and the display device. The DVD player sets the resolution of an image to be output to the AV amplifier based on the read resolution type by a user operation. Specifically, the resolution setting is executed by displaying a resolution setting screen of the DVD player and selecting a desired resolution from a plurality of resolutions displayed on the screen. The resolution type displayed on the resolution setting screen is a resolution type that matches the resolution type read from the PROM of the AV amplifier among the resolution types stored in advance in the DVD player. Therefore, on the resolution setting screen, the type of resolution stored in common by the AV amplifier and the display device can be displayed.

  Similarly, as shown in FIG. 5B, the AV amplifier can be connected via a DVI cable to a display device compliant with the DVI (Digital Visual Interface) standard that is compatible with the HDMI standard. Also in this case, the AV amplifier reads EDID from the display device, and PROM stores the EDID including the resolution type common to the resolution type included in the EDID and the resolution type stored in advance in the ROM of the AV amplifier. Register with. The DVD player reads the EDID from the PROM of the AV amplifier and displays the type of resolution included in the EDID on the resolution setting screen.

Japanese Patent Laid-Open No. 11-15425

  As described above, in the AV amplifier PROM, only the resolution types stored in the AV amplifier ROM that match the resolution types stored in the display device PROM are registered. Therefore, even if the resolution can be processed by the display device, if the resolution is not stored in the ROM of the AV amplifier, the resolution is not displayed on the resolution setting screen of the DVD player, and the DVD player outputs image data at the resolution. I can't. This is a problem that often occurs when a DVI standard display device is connected to an HDMI standard AV amplifier. This is because the display device of the DVI standard has more types of resolutions that can be displayed than that of the HDMI standard.

  For example, the types of resolution stored in the ROM of the AV amplifier are a, b, c, and d, and the types of resolution stored in the PROM of the display device are a, b, c, d, e, and f. Suppose there is. In this case, only common resolutions a, b, c, and d are registered in the PROM of the AV amplifier, and resolutions e and f are not registered. As a result, only the resolutions a, b, c, and d are displayed on the resolution setting screen of the DVD player, the resolutions e and f are not displayed, and the DVD player has the resolutions e and f as resolutions when outputting image data. f cannot be set. That is, although the display device can display images with resolutions e and f, the DVD player has a problem that it cannot output image data with resolutions e and f.

  An object of the present invention is to provide an AV amplifier capable of outputting image data at a resolution that can be processed by a display apparatus, but the DVD player can output image data even at a resolution that is not stored in the AV amplifier. .

  An image transmitting / receiving apparatus according to a preferred embodiment of the present invention includes an image receiving unit that receives image data from an externally connected image reproducing device, and an image transmitting unit that transmits the image data to an externally connected image display device. A first storage means for storing the type of resolution read by the image reproduction apparatus; a second storage means for storing the type of resolution in advance; and a resolution stored in advance in the image display apparatus. Reading means for reading out the types from the image display device and all of the resolution types read out by the reading means, or among the types of resolutions read out by the reading means, the image transmission means transmits to the image display device Resolution registration means for registering possible resolution types in the first storage means.

  In a preferred embodiment, the image transmitting / receiving apparatus determines whether there is a resolution that is not stored in the second storage means among the resolution types read by the reading means from the image display apparatus. A judging means is further provided. If it is determined that there is a resolution that is not stored in the second storage unit among the resolution types read by the reading unit, the resolution registration unit is configured to display all the resolution types read by the reading unit. Alternatively, among the resolution types read by the reading unit, the image transmission unit registers the type of resolution that can be transmitted to the image display device in the first storage unit.

  An image transmitting / receiving apparatus according to another preferred embodiment of the present invention complies with the first standard, and includes an image receiving means for receiving image data from an externally connected image reproducing apparatus, and an externally connected image display. Image transmitting means for transmitting the image data to the apparatus, first storage means for storing the type of resolution read by the image reproducing apparatus, second storage means for storing the type of resolution in advance, Reading means for reading out the type of resolution stored in advance in the image display apparatus from the image display apparatus, and determination means for determining whether or not the connected image display apparatus conforms to the second standard And when it is determined that the image display device conforms to the second standard, all of the resolution types read by the reading means, or among the resolution types read by the reading means, The image transmission Means and a resolution registration means for registering the type of transmission possible resolutions to the image display device in the first storage means.

  In a preferred embodiment, when it is determined that the image display device conforms to the first standard, the resolution registration unit is selected from among the resolution types stored in the second storage unit. The resolution type that matches the resolution type read from the image display device is registered in the first storage means.

  In a preferred embodiment, the image transmission / reception apparatus further includes mode setting means that can be set to the first mode or the second mode, and mode determination means that determines the mode set by the mode setting means. When it is determined that the image display device conforms to the second standard and the set mode is the first mode, the resolution registration unit is configured to display the resolution type read by the reading unit. All or the resolution types that can be transmitted to the image display device by the image transmission unit among the resolution types read by the reading unit are registered in the first storage unit. When it is determined that the image display apparatus conforms to the second standard and the set mode is the second mode, the resolution registration unit is stored in the second storage unit. Among the resolution types, the resolution type that matches the resolution type read from the image display device is registered in the first storage means.

  In a preferred embodiment, the image transmission / reception device includes a selection unit that selects one image data from among a plurality of image data transmitted from the plurality of image reproduction devices, and a first mode corresponding to a selection state of the selection unit. Alternatively, it further includes mode setting means for setting the second mode, and mode determination means for determining a mode corresponding to the changed selection state when the selection state of the selection means is changed. If it is determined that the selected state after the change is the first mode, the resolution registering unit may include all of the resolution types read by the reading unit or the resolution type read by the reading unit. The image transmission unit registers the type of resolution that can be transmitted to the image display device in the first storage unit. When it is determined that the selected state after the change is the second mode, the resolution registration unit reads the resolution read from the image display device among the resolution types stored in the second storage unit. The type of resolution that matches the type of is registered in the first storage means.

  In a preferred embodiment, the first standard is an HDMI standard, and the second standard is a DVI standard.

  An image transmission / reception apparatus operation program according to a preferred embodiment of the present invention includes an image reception step of receiving image data from an externally connected image reproduction apparatus, and an image of transmitting the image data to an externally connected image display apparatus. A transmission step, a resolution registration step for registering the resolution type in a first storage means for storing the resolution type read by the image reproduction device, and a resolution type stored in advance in the image display device. And a reading step of reading from the image display device. In the resolution registration step, all of the resolution types read by the reading unit, or of the resolution types read by the reading unit, the resolution types that the image transmitting unit can transmit to the image display device are Registered in the first storage means.

  The image transmission / reception device ignores the resolution types stored in advance in the second storage unit and registers all the resolution types read from the image display device in the first storage unit. Alternatively, among the resolution types read from the image display device, the resolution that can be transmitted by the image transmission unit (that is, the resolution corresponding to the frequency that cannot be transmitted by the image transmission unit) is registered in the first storage unit. Therefore, even when there is a resolution that can be processed by the image display apparatus and is not stored in the second storage unit of the image transmission / reception apparatus, the resolution of the resolution that can be processed by the image display apparatus is displayed on the resolution setting screen of the image reproduction apparatus. All types can be displayed and the user can select the resolution. The image reproduction device can output image data at a resolution selected from all resolutions that can be processed by the image display device.

  When the connected image display apparatus conforms to the second standard, it is determined that there is a resolution that can be processed by the image display apparatus but is not stored in the second storage unit of the AV amplifier. . Therefore, the image transmission / reception device ignores the resolution types stored in advance in the second storage unit and registers all the resolution types read from the image display device in the first storage unit. Alternatively, among the resolution types read from the image display device, the resolution that can be transmitted by the image transmission unit is registered in the first storage unit. Thereby, the effect similar to the above is acquired.

  Hereinafter, a DVD player (image reproduction device), an AV amplifier (image transmission / reception device), and a display device (image display device) according to preferred embodiments of the present invention will be specifically described with reference to the drawings. It is not limited to the embodiment.

  FIG. 1A is a schematic block diagram showing the configurations of the DVD player 10 and the AV amplifier 20, and FIG. 1B is a schematic block diagram showing the configurations of the AV amplifier 20 (same as FIG. 1A) and the display device 30, respectively. The DVD player 10 and the AV amplifier 20 conform to the HDMI standard and are connected via an HDMI cable. The display device 30 conforms to the HDMI standard or the DVI standard, and is connected to the AV amplifier 20 via the HDMI cable in the case of the HDMI standard and via the DVI cable in the case of the DVI standard.

  First, the configuration of the DVD player 10 will be described. The DVD player 10 includes a reproduction unit 11, a resolution conversion unit 12, an HDMI transmission unit 13, a system control unit 14, an operation display unit 15, a memory 16, and a connector unit 17.

  The reproduction unit 11 reads out image data recorded on a DVD disc (hereinafter simply referred to as a disc) from the disc, decodes it, and supplies it to the resolution conversion unit 12. Also, the playback unit 11 reads out audio data recorded on the disc from the disc, decodes it, and supplies it to the HDMI transmission unit 13. The reproducing unit 11 includes an optical pickup, a servo circuit, an MPEG decoder, etc. (not shown).

  The resolution conversion unit 12 determines the resolution of the image data supplied from the reproduction unit 11. Further, the resolution conversion unit 12 converts the determined resolution of the image data into a resolution set by the user by a command from the system control unit 14. The image data whose resolution is converted by the resolution conversion unit 12 is supplied to the HDMI transmission unit 13.

  The HDMI transmission unit 13 converts the image data supplied from the resolution conversion unit 12 and the audio data supplied from the playback unit 11 into HDMI standard data (hereinafter simply referred to as HDMI data) by a command from the system control unit 14. Convert to The HDMI transmission unit 13 transmits the converted HDMI data to the AV amplifier 20 via the connector unit 17.

  The HDMI transmission unit 13 determines TMDS lines for transmitting and receiving HDMI data (normally, there are a plurality of lines, but only one line is shown in FIGS. 1 and 2 for simplicity), and whether or not there is a connection. Is connected to the HDMI receiving unit 21 of the AV receiver 20 through the hot plug.

  The system control unit 14 controls the reproduction unit 11, the resolution conversion unit 12, the HDMI transmission unit 13, the operation display unit 15, the memory 16, and the like, and is a microcomputer, for example. The system control unit 14 executes various processes based on an operation input from the operation display unit 15 or a control signal and data from each unit.

  The system control unit 14 is connected to the system control unit 23 of the AV amplifier 20 via the CEC line, and transmits / receives commands and / or data to / from the system control unit 23. The system control unit 14 is connected to the PROM 25 of the AV amplifier 20 via the DDC line, reads the EDID stored in the PROM 25, and reads the type of resolution.

  The system control unit 14 causes the operation display unit 15 to display a setup menu for performing various initial settings. The setup menu includes a resolution setting screen for setting the resolution of the output image data by a user operation. When the resolution is set by the user, the system control unit 14 transmits a command for converting an image to the set resolution to the resolution conversion unit 12.

  The memory 16 (for example, ROM) stores in advance the types of resolution that the DVD player 10 can output to the AV amplifier 20.

  The system control unit 14 reads out the resolution type stored in the PROM 25 of the AV amplifier 20 via the DDC line and collates it with the resolution type stored in the memory 16 in advance. The system control unit 14 displays on the resolution selection screen a resolution type that matches the resolution type included in the EDID read from the PROM 25 of the AV amplifier 20 from among the resolution types stored in the memory 16 in advance. To do.

  Next, the configuration of the AV amplifier 20 will be described. The AV amplifier 20 includes an HDMI receiving unit 21, an HDMI transmitting unit 22, a system control unit 23, an operation display unit 24, a memory (EDID PROM, hereinafter referred to as PROM) 25, an audio processing unit 26, and a connector unit 27. , 28.

  The HDMI receiving unit 21 receives the HDMI data transmitted from the DVD player 10, generates original image data (image data before HDMI conversion) from the received HDMI data, and supplies it to the HDMI transmitting unit 22. Further, the HDMI receiving unit 21 generates original audio data from the received HDMI data and supplies the generated audio data to the audio processing unit 26.

  The HDMI transmitting unit 22 converts the image data supplied from the HDMI receiving unit 21 and the audio data supplied from the audio processing unit 26 as necessary into HDMI data, and displays the data via the connector unit 28. To device 30. The HDMI transmission unit 22 is connected to the HDMI reception unit 31 of the display device 30 via a TMDS line and a hot plug.

  The audio processing unit 26 performs processing such as signal processing, amplification processing, and D / A conversion on the audio data supplied from the HDMI receiving unit 21, and supplies the audio signal to the speaker 60 connected to the outside. . Further, the audio processing unit 26 supplies audio data to the HDMI transmission unit 22 as necessary.

  The system control unit 23 controls the HDMI reception unit 21, the HDMI transmission unit 22, the operation display unit 24, the PROM 25, the audio processing unit 26, and the like, and is a microcomputer, for example. The system control unit 23 executes various processes based on an operation input from the operation display unit 24 or a control signal and data from each unit.

  The system control unit 23 is connected to the system control unit 14 of the DVD player 10 via the CEC line, and transmits and receives commands and data to and from the system control unit 14. The system control unit 23 is connected to the system control unit 33 of the display device 30 via the CEC line, and transmits and receives commands and data to and from the system control unit 33. Further, the system control unit 23 is connected to the PROM 34 of the display device 30 via the DDC line, and reads the EDID including the resolution type that can be displayed on the display device 30 from the PROM 34.

  The system control unit 23 incorporates (or is connected to) a memory 23a such as a ROM, and the type of resolution output from the AV amplifier 20 is stored in the ROM 23a in advance (this type of resolution is the ROM 23a). Rather, it may be stored in the PROM 25). Normally, the ROM 23a stores a plurality of resolution types corresponding to the HDMI standard.

  The PROM 25 is connected to the system control unit 14 of the DVD player 10 via a DDC line. In the PROM 25, the EDID including the type of resolution is registered by the system control unit 23, and the registered EDID is read by the system control unit 14 of the DVD player 10 via the DDC line.

  The system control unit 23 has a normal mode and an EDID copy mode described below as modes for registering the EDID read by the DVD player 10 in the PROM 25.

  The normal mode is a mode in which the resolution type that matches the resolution type included in the EDID read from the PROM 34 of the display device 30 among the resolution types stored in advance in the ROM 23 a is registered in the PROM 25. That is, the type of resolution that the AV amplifier 20 and the display device 30 store in common is registered in the PROM 25.

  Specifically, the types of resolution stored in advance in the ROM 23a of the AV amplifier 20 are a, b, c, d, and the types of resolution stored in the PROM 34 of the display device 30 are a, b, c, In the case of d, e, and f, EDID including resolutions a, b, c, and d is registered in the PROM 25 in the normal mode.

  The EDID copy mode is a mode in which all the resolution types read from the PROM 34 of the display device 30 are registered in the PROM 25 ignoring the resolution types stored in the ROM 23a. That is, the resolution type stored in the display device 30 is registered in the PROM 25 regardless of the resolution type stored in the AV amplifier 20.

  Specifically, the resolution types stored in advance in the ROM 23a of the AV amplifier 20 are a, b, c, d, and the resolution types read from the PROM 34 of the display device 30 are a, b, c, d, In the case of e and f, EDID including resolutions a, b, c, d, e, and f is registered in the PROM 25 in the EDID copy mode.

  In the EDID copy mode, among the resolution types read from the PROM 34 of the display device 30, only the resolution that can be transmitted by the HDMI transmission unit 22 to the display device 30 can be registered in the PROM 25. “Resolution at which the HDMI transmission unit 22 can transmit to the display device 30” is a resolution corresponding to a frequency at which the HDMI transmission unit 22 can convert and output image data, and corresponds to a frequency at which the HDMI transmission unit 22 cannot convert and output. This means all the resolutions except for the resolution to be used (for example, the progressive transmission such as 1080p cannot be converted and output by the HDMI transmission unit 20). In this case, since the resolution that cannot be output by the HDMI transmission unit 22 is not registered in the PROM 25, the problem that the image data is not transmitted to the display device 30 can be prevented. In the following description, an example in which all the resolutions recorded in the display device 30 are registered in the PROM 25 in the EDID copy mode will be described. Of the resolution types recorded in the display device 30, the HDMI transmission is performed. The same applies to the case where the unit 22 registers only the resolution that can be transmitted to the display device 30 in the PROM 25.

  The normal mode or the EDID copy mode can be set by the user. For example, a flag is stored in a RAM (not shown) of the system control unit 23, the flag is set when the EDID copy mode is set, and the flag is reset when the normal mode is set.

  When the display device 30 connected to the AV amplifier 20 conforms to the HDMI standard, the system control unit 23 registers the resolution type in the PROM 25 in the normal mode. On the other hand, if the display device 30 connected to the AV amplifier 20 conforms to the DVI standard and the EDID copy mode is set, the system control unit 23 registers the resolution type in the PROM 25 in the EDID copy mode. If the normal mode is set, the resolution type is registered in the PROM 25 in the normal mode.

  Next, the configuration of the display device 30 will be described. The display device 30 may be a display device that conforms to the HDMI standard or a display device that conforms to the DVI standard. An HDMI standard display device 30 will be described as an example. The display device 30 includes an HDMI receiving unit 31, a display unit 32, a system control unit 33, a memory (EDID PROM, hereinafter referred to as PROM) 34, and an operation unit 35. , An audio processing unit 36, a speaker 37, and a connector unit 38.

  The HDMI receiving unit 31 receives the HDMI data transmitted from the HDMI transmitting unit 22 of the AV amplifier 20, generates original image data from the received HDMI data, and supplies the original image data to the display unit 32. In addition, the HDMI receiving unit 31 generates original audio data from the HDMI data and supplies it to the audio processing unit 36.

  The display unit 32 is supplied with image data from the HDMI receiving unit 31 and displays an image based on the image data, and is, for example, an LCD or a CRT.

  The audio processing unit 36 performs processing such as signal processing, amplification processing, and D / A conversion on the audio data supplied from the HDMI receiving unit 31 and supplies the processed audio data to the speaker 37.

  The system control unit 33 controls the HDMI receiving unit 31, the display unit 32, the PROM 34, the audio processing unit 36, and the like, and is a microcomputer, for example. The system control unit 33 executes various processes based on an operation input from the operation unit 35 or a control signal and data from each unit.

  In the PROM 34, an EDID including a resolution type that can be displayed on the display unit 32 is stored in advance. The EDID is read by the system control unit 23 of the AV amplifier 23 via the DDC line.

  When the display device 30 is compliant with the DVI standard, a DVI receiving unit is provided instead of the HDMI receiving unit 31. The DVI receiving unit receives DVI data (DVI data does not include audio data but includes only image data), and supplies the image data to the display unit 32. Further, a DVI cable is connected to a display device compliant with the DVI standard, and the DVI cable is connected to an HDMI cable connected to an AV amplifier via a conversion connector.

  The operation and action of the system having the above configuration will be described with reference to FIG. FIG. 2 is a flowchart for explaining processing of the AV amplifier 20. First, when the AV amplifier 20 is powered on (S1), the system control unit 23 determines whether or not the DVD player 10 is connected to the connector unit 27 (S2). If it is determined that the DVD player 10 is connected (S2: YES), the system control unit 23 determines whether or not the display device 30 is connected to the connector unit 28 (S3).

  If it is determined that the display device 30 is connected (S3: YES), the system control unit 23 reads the EDID from the PROM 34 of the display device 30 via the DDC line (S4). The system control unit 23 reads and analyzes the resolution types that can be displayed by the display device 30 from the read EDID.

  Next, the system control unit 23 determines whether the connected display device 30 is a device compliant with the HDMI standard or a device compliant with the DVI standard (S5). That is, since the information indicating the standard of the display device is included in the EDID read from the PROM 34, the system control unit 23 determines the standard of the display device 30 by analyzing this information.

  When it is determined that the display device 30 conforms to the DVI standard (S5: DVI), the system control unit 23 determines whether or not the EDID copy mode is set by checking a flag (S6).

  If it is determined that the EDID copy mode is set (S6: YES), the system control unit 23 registers in the PROM 25 the EDID including all the resolution types read from the PROM 34 of the display device 30 in S4. That is, the resolution type stored in the ROM 23 a of the AV amplifier 20 is ignored, and the resolution type read from the display device 30 is registered in the PROM 25.

  Thereafter, the system control unit 23 prompts the DVD player 10 to read out the EDID by setting the hot plug on the connector unit 27 (DVD player 10) side to a high level (S9). That is, when the system control unit 14 of the DVD player 10 confirms that the hot plug is set to the high level, the EDID is read from the PROM 25 via the DDC line, and the type of resolution stored in the PROM 25 is analyzed. .

  When the display instruction of the resolution setting screen is input from the user, the system control unit 14 of the DVD player 10 has the resolution stored in the PROM 25 of the AV amplifier 20 among the resolution types stored in advance in the memory 16. Select the one that matches the type and display it on the resolution setting screen. In general, all resolutions considered to be compatible with the connected device are stored in the memory 16 in advance in the DVD player 10, so that the resolution setting screen is stored in the PROM 25 of the AV amplifier 20. All resolution types are displayed. The user selects one desired resolution from the resolution types displayed on the resolution setting screen.

  Therefore, when the display device 30 of the DVI standard is connected to the AV amplifier 20 and the EDID copy mode is set, the type of resolution stored in the AV amplifier 20 is displayed on the resolution setting screen of the DVD player 10. Regardless of the type, all types of resolution stored in the display device 30 are displayed. Therefore, even when there are resolutions that can be displayed on the display device 30 but are not stored in the AV amplifier 20, all types of resolutions that can be displayed on the display device 30 are displayed on the resolution setting screen of the DVD player 10. Can do.

  Specifically, the types of resolution stored in the PROM 34 of the display device 30 of the DVI standard are a, b, c, d, e, and f, and the types of resolution stored in advance in the ROM 23a of the amplifier device 20. In the EDID copy mode, all the resolutions a, b, c, d, e, and f stored in the PROM 34 of the display device 30 are displayed on the resolution setting screen. Therefore, the DVD player 10 can output image data at resolutions e and f that can be displayed on the display device 30 but are not stored in the AV amplifier 20.

  When the DVD player 10 outputs image data at resolutions e and f (these resolutions are compatible only with the DVI standard), the HDMI receiving unit 21 of the AV amplifier 20 does not include audio data but only image data. The received data is received via the HDMI cable, and image data is generated and supplied to the HDMI transmitting unit 22. The HDMI transmission unit 22 receives the image data from the HDMI reception unit 21 and transmits it to the display device 30. As described above, even when image data is transmitted from the DVD player 10 at the resolutions e and f that are not stored in the ROM 23 a of the AV amplifier 20, the AV amplifier 20 transmits the image data at the resolutions e and f to the display device 30. can do. Since the HDMI data transmitted to the AV amplifier 20 does not include audio data, the AV amplifier 20 cannot supply an audio signal to the speaker 60 based on the HDMI data. In this case, for example, it is necessary to transmit audio data from the DVD player 10 to the AV amplifier 20 via an IEEE 1394 cable or the like.

  If it is determined that the EDID copy mode is not set (S6: NO), the system control unit 23 has the resolution read from the PROM 34 of the display device 30 among the resolution types stored in the ROM 23a. Only the resolution type that matches the type is selected and registered in the PROM 25 (S8). In this case, only the resolution types stored in common in the display device 30 and the amplifier device 20 are displayed on the resolution setting screen. As a result, the DVD player 10 cannot output image data at the resolution stored only in the display device 30.

  If it is determined in S5 that the display device 30 is compliant with the HDMI standard, the system control unit 23 reads the resolution read from the PROM 34 of the display device 30 among the resolution types stored in the ROM 23a. Only the resolution type that matches this type is selected and registered in the PROM 25 (S8).

  In this way, when the HDMI standard display device 30 is connected, the EDID including the resolution type is registered in the PROM 25 in the normal mode regardless of the mode setting of the user. This is because if the display device 10 is the HDMI standard, the AV amplifier 20 needs to output image data at a resolution stored in both the display device 30 and the AV amplifier 20. If the display device 10 is HDMI standard, both the AV amplifier 20 and the display device 30 are HDMI standard. Therefore, the resolution type that can be processed by the display device 30 is the resolution stored in the ROM 23 a of the AV amplifier 20. It is because it is included in the kind of.

  When it is determined in S3 that the display device 30 is not connected (S3: NO), the system control unit 23 registers all the EDIDs stored in the ROM 23a in the PROM 25 (S10), and proceeds to S9.

  As described above, according to the AV amplifier 20 of the present embodiment, even when there is a resolution that can be displayed on the display device 30 and is not stored in the AV amplifier 20, the display on the resolution setting screen of the DVD player 10 is performed. All types of resolutions that can be displayed by the device 30 can be displayed.

  Next, another preferred embodiment of the present invention will be described. In the present embodiment, as shown in FIG. 3, the AV amplifier 20 is connected to a plurality of DVD players (in this example, three DVD players 10A to 10C). The DVD player 10A transmits image data to the AV amplifier 20 via the HDMI cable and audio data via the IEEE 1394 cable. The DVD player 10B transmits image data and audio data to the AV amplifier 20 via the HDMI cable. The DVD player 10C transmits the image data to the AV amplifier 20 via the DVI cable and the audio data via the optical cable.

  The AV amplifier 20 further includes a selector circuit 29 that selects and outputs image data and audio data input from one DVD player from image data and audio data input from the DVD players 10A to 10C. Yes. The selector circuit 29 has a plurality of selection states (in this example, selection states 1 to 3). Selection state 1 is assigned to an input terminal to which the DVD player 10A is connected, and selection state 2 is assigned to the DVD player 10B. The selected state 3 is assigned to the input terminal to which the DVD player 10C is connected.

The system control unit 23 stores a mode setting table shown in Table 1 below in a built-in RAM (not shown). In the mode setting table, whether the EDID is registered in the PROM 25 in the normal mode or the EDID copy mode is set for each of the selection states 1 to 3. The mode corresponding to the selection states 1 to 3 can be arbitrarily set by the user.

  In this example, every time the selection state of the selector circuit 29 is switched by the user, the system control unit 23 automatically registers the EDID including the resolution type in the PROM 25. For example, referring to Table 1, when the selection state of the selector circuit 29 is changed from the selection state 1 to the selection state 2, the system control unit 23 registers EDID in the PROM 25 in the normal mode.

  This operation will be described with reference to the flowchart of FIG. In addition, the same code | symbol is attached | subjected to the process same as FIG. 2, and description is abbreviate | omitted or simplified. The system control unit 23 always determines whether or not the selection state of the selector circuit 29 has been changed (S41). If it is determined that the selection state of the selector circuit 29 has been changed (S41: YES), the system control unit 23 reads EDID from the PROM 34 of the display device 30 (S4), and the display device 30 conforms to the DVI standard ( S5: DVI), referring to the mode setting table in Table 1, the mode corresponding to the changed selection state is confirmed (S42). If the mode corresponding to the changed selection state is the EDID copy mode (S6: YES), the EDID is registered in the PROM 25 in the EDID copy mode, and if it is the normal mode (S6: NO), the EDID is stored in the PROM 25 in the normal mode. Register.

  As described above, the mode corresponding to the selection state of the selector circuit 29 is set in advance, and when the selection state is changed, the user automatically performs EDID setting operation by re-registering the EDID in the PROM 25. The EDID can be re-registered in the PROM 25 without being executed or once turning off the power of the AV amplifier.

  As described above, when the selection state of the selector circuit 29 is switched, the resolution is re-registered in the PROM 25, so that when the DVD players 10A to 10C are connected to the AV amplifier 20 in the form shown in FIG. The kind of resolution suitable for the player can be displayed on the resolution setting screen.

  Specifically, when the DVD player 10A (selection state 1) is selected by the selector circuit 29, when the DVI standard display device 30 is connected to the AV amplifier 20, as shown in Table 1, the PROM 25 is used in the EDID copy mode. EDID is registered. In this case, if a resolution corresponding to only the DVI standard is selected on the resolution selection screen, the DVD player 10A cannot transmit audio data via the HDMI cable. However, since the audio data is originally transmitted by IEEE 1394, AV The amplifier 20 does not become unable to supply an audio signal to the speaker 60.

  On the other hand, when the DVD player 10B (selected state 2) is selected by the selector circuit 29, when the DVI standard display device 30 is connected to the AV amplifier 20, the EDID is registered in the PROM 25 in the normal mode as shown in Table 1. Is done. Since the DVD player 10B transmits image data and audio data using an HDMI cable, if a resolution corresponding only to the DVI standard is selected on the resolution selection screen, the DVD player 10A receives audio data via the HDMI cable. Cannot send. Therefore, when the DVD player 10B is selected, such a problem can be solved by registering the EDID in the PROM 25 in the normal mode.

  Next, still another embodiment of the present invention will be described. In this example, instead of determining whether or not the display device 30 complies with the DVI standard in S5 of FIG. 2, the type of resolution read from the display device 30 in S4 and the type of resolution stored in the ROM 23a In contrast, it is determined whether there is a resolution type that is not stored in the ROM 23a among the resolution types stored in the display device 30. If there is a resolution type that is not stored in the ROM 23a among the resolution types stored in the display device 30, the process proceeds to S7, and if not, the process proceeds to S8. In this case, even when the display device 30 conforms to the HDMI standard, if there is a resolution type that is not stored in the ROM 23a of the AV amplifier 20 among the resolution types stored in the display device 30, ( When the EDID copy mode is set), the resolution type is registered in the PROM 25 in the EDID copy mode.

  For example, the AV amplifier 20 and the display device 30 both conform to the HDMI standard, and the types of resolution stored in the ROM 23a of the AV amplifier 20 are a, b, c, and d, and are stored in the PROM 34 of the display device 30. Assume that the types of resolutions are a, b, c, d, e, and f. In this case, the resolution types a, b, c, d, e, and f are registered in the PROM 25 of the AV amplifier 20. Therefore, the DVD player 10 can output image data at any one of resolutions a, b, c, d, e, and f.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment. For example, when the display device conforms to the HDMI standard, the EDID may be registered in the PROM 25 in the EDID copy mode. Further, the program may be provided in the form of a program for causing a computer to execute the above operations of the DVD player, AV amplifier, and display device, and a recording medium on which the program is recorded.

  The present invention can be suitably employed in DVD players, AV amplifiers, display devices, and the like that can change the resolution when outputting image data.

1 is a block diagram showing a configuration of a DVD player 10 and an AV amplifier 20 according to a preferred embodiment of the present invention. 1 is a block diagram showing a configuration of an AV amplifier 20 and a display device according to a preferred embodiment of the present invention. 5 is a flowchart for explaining the operation of the AV amplifier 20. It is a block diagram which shows the structure of another preferable embodiment of this invention. 4 is a flowchart for explaining the operation of the AV amplifier in the configuration of FIG. 3. It is a block diagram explaining the conventional structure.

Explanation of symbols

10 DVD player (image playback device)
20 AV amplifier (image transmission / reception device)
21 HDMI receiver 22 HDMI transmitter 23 System controller 23a ROM
25 PROM
30 Display device (image display device)

Claims (5)

Image receiving means for receiving image data from an externally connected image reproduction device;
Image transmission means for transmitting the image data to an externally connected image display device;
First storage means for storing the type of resolution read by the image reproduction device;
A second storage means in which the resolution type is stored in advance;
Reading means for reading out the type of resolution stored in advance in the image display device from the image display device;
Judgment means for judging whether or not there is a resolution that is not stored in the second storage means among the resolution types read by the reading means from the image display device;
If it is determined that there is a resolution that is not stored in the second storage means among the resolution types read by the reading means, all of the resolution types read by the reading means or the reading means An image transmission / reception apparatus comprising: a resolution registration means for registering, in the first storage means, a resolution type that can be transmitted to the image display apparatus by the image transmission means among the resolution types read by. Image receiving means for receiving image data from an externally connected image reproduction device;
Image transmission means for transmitting the image data to an externally connected image display device;
First storage means for storing the type of resolution read by the image reproduction device;
A second storage means in which the resolution type is stored in advance;
Reading means for reading out the type of resolution stored in advance in the image display device from the image display device;
Determining means for determining whether the connected image display device conforms to the DVI standard;
When it is determined that the image display device is compliant with the DVI standard, the image transmission means includes all the resolution types read by the reading means or the resolution types read by the reading means. An image transmission / reception apparatus comprising: resolution registration means for registering in the first storage means a resolution type that can be transmitted to the image display apparatus.   When it is determined that the image display device conforms to the HDMI standard, the resolution registered by the resolution registration unit is read from the image display device among the resolution types stored in the second storage unit. The image transmission / reception apparatus according to claim 2, wherein a resolution type that matches the type of the image is registered in the first storage unit. Mode setting means that can be set to EDID copy mode or normal mode;
Mode determining means for determining the mode set by the mode setting means,
When it is determined that the image display device conforms to the DVI standard and the set mode is the EDID copy mode, the resolution registration unit is configured to display all of the resolution types read by the reading unit, or Of the resolution types read by the reading means, the image transmitting means registers the resolution types that can be transmitted to the image display device in the first storage means,
When it is determined that the image display device conforms to the DVI standard and the set mode is the normal mode, the resolution registration unit stores the resolution type stored in the second storage unit. 4. The image transmitting / receiving apparatus according to claim 2, wherein a resolution type that matches a resolution type read from the image display apparatus is registered in the first storage unit. 5. Selecting means for selecting one image data from among image data transmitted from the plurality of image reproducing devices;
Mode setting means for setting an EDID copy mode or a normal mode corresponding to the selection state of the selection means;
Mode selection means for determining a mode corresponding to the changed selection state when the selection state of the selection means is changed,
When it is determined that the selected state after the change is the EDID copy mode, the resolution registration unit selects all of the resolution types read by the reading unit or the image of the resolution types read by the reading unit. The transmission means registers the type of resolution that can be transmitted to the image display device in the first storage means,
When it is determined that the selected state after the change is the normal mode, the resolution registration unit reads the resolution type read from the image display device among the resolution types stored in the second storage unit The image transmission / reception apparatus according to claim 2, wherein a resolution type that matches with the first storage unit is registered in the first storage unit.

Images