KR20070082677A - Method for identifying information of analog video input of image display device - Google Patents

Abstract

A method for confirming information about an analog image input of an image display device is provided to allow a source device to confirm a format of an image signal capable of being processed by the image display device through a certain communication interface when the source device provides the certain analog image signal to the image display device. A source device(201) capable of outputting a certain analog image signal transmits a state command for requesting information about the analog image signal capable of being processed by a DTV(Digital TV)(203) to the DTV(203) connected through an additional communication interface(S501,S503). The source device(201) receives a response transmitted from the DTV(203) on the basis of the transmitted state command and confirms the information about the analog image signal(S507,S509).

Description

Method for identifying information of analog video input of image display device}

1 is a view showing an image display device and a source device to which the present invention is applied;

2 is a view showing a connection between a DTV and a source device according to an embodiment of the present invention;

3 is a diagram illustrating a frame structure of a status command (ANALOG VIDEO INPUT PLUG INFO status command);

4 shows a frame of a response to a status command, and

5 is a flowchart provided to explain a process in which a source device outputs a predetermined analog video signal to a DTV.

According to an aspect of the present invention, there is provided a source apparatus for providing a video signal to a video display device, wherein the video display device checks the format of a video signal that the video display device can process through a predetermined communication interface. The present invention relates to a method of checking information on an analog video input.

Some recent digital TVs can receive and reproduce not only digital video signals but also analog video signals. Correspondingly, a source device connected to a digital TV and providing a predetermined video signal is also designed to provide not only a digital video signal but also an analog video signal.

There are types of analog video signals such as component, composite, and S-video, and the method of processing a predetermined video varies according to these types. Therefore, a source device that provides a predetermined analog video signal to the digital TV needs to check in advance the type of analog video signal that the digital TV can process.

SUMMARY OF THE INVENTION An object of the present invention is to provide a video signal to a video display device by a source device that provides a video signal, and to identify a format of a video signal that can be processed by the video display device through a predetermined communication interface. A method of identifying information about an analog video input of a device is provided.

In order to achieve the above object, a method of verifying information on an analog image input of an image display apparatus by a source apparatus according to the present invention includes processing the image display apparatus to an image display apparatus to which the source apparatus is connected through a predetermined communication interface. Transmitting a status command for requesting information on an analog video signal, and confirming the information by receiving the response from the image display apparatus based on the transmitted status command. Steps.

The image display device may be a digital TV, and the communication interface may be an IEEE 1394 serial interface. In this case, the status command may include an opcode indicating that the video display device is a request for information on an analog video signal, a type information of the video display device, and an identifier of the video display device. Contains (subunit_ID). In addition, the opcode may be 26 ₁₆ .

Further, the status command may further include an analog video input plug ID of the analog video signal input terminal of the video display device.

The identifier of the analog video signal input terminal of the video display device may be included in a plug info block included in a unit identifier descriptor of the digital TV.

The response of the video display device may transmit one of a predetermined status response and a rejection response in response to the status command, and may include information on a predetermined analog video signal when the status response is transmitted. The information on the predetermined analog video signal may include information about a format of an analog video signal that may be processed by the video display device.

When the status command includes an identifier of an analog video signal input terminal of the video display device, information about the predetermined analog video signal included in the status response corresponds to the identifier. It may include the format of the analog video signal and its serial number.

Here, the status response may be a value corresponding to the format of the analog video signal, the composite format may include '0', the S-video format includes '1', and the component format may include '2'. Can be.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a diagram illustrating an image display device and a source device to which the present invention is applied.

Referring to FIG. 1, the source device 101 is connected to the image display device 103.

The source device 101 according to an exemplary embodiment may provide an analog image signal to the image display apparatus 103, and the image display apparatus 103 may display an image corresponding to the analog image signal. In this case, the source device 101 may process the video display device 103 or check the format of a preferred video signal. Accordingly, the source device 101 can determine which analog video signal output terminal to output the signal to the video display device 103.

The image display device 103 may receive at least an analog image signal and display a corresponding image to a user, and may be connected to the source device 101 through a predetermined communication interface a. The image display device 103 may process at least one of a component, a composite, and a S-video analog video signal, and may include an input terminal corresponding to the video signal that can be processed. .

The communication interface a included in the image display device 103 is preferably a serial interface, and may correspond to the Institute of Electrical and Electronics Engineers (IEEE) 1394 standard. In this case, if the video display device 103 is a digital TV (hereinafter referred to as 'DTV'), the communication interface (a) preferably supports the CEA-775B standard, which is a standard for the IEEE 1394 interface for DTV. Do.

In addition, when the video display device 103 is a DTV capable of receiving and processing digital video signals, the video display device 103 may receive digital video signals through a communication interface a conforming to the IEEE 1394 standard.

The source device 101 may transmit a predetermined analog signal to the video display device 103 and may include an output terminal corresponding to a format of an outputable video signal. In addition, the source device 101 may be connected to the image display device 103 through a predetermined communication interface (b). The source device 101 may correspond to a set-top box (STB), a digital VCR, a camcorder, or the like.

When the source device 101 provides an analog video signal to the video display device 103, a predetermined status command for confirming the format of the video signal that can be processed by the video display device 103 or the preferred video signal. ) Can be sent.

The image display apparatus 103 may transmit a predetermined response to the source device 101 in response to the status command received from the source device 101. If the image display apparatus 103 can inform the format of the analog video signal, the image display device 103 transmits a status response including information on the format of the analog video signal, and otherwise, sends a reject response.

Hereinafter, when the image display device 103 is a DTV and supports the CEA-775B standard according to an embodiment of the present invention, a status command and a response thereof will be described with reference to FIGS. 2 to 4. First, the CEA-775B standard between the video display device 103 and the source device 101 will be described.

The CEA-775B is a standard for the IEEE1394 interface of the DTV. The CEA-775B is a digital audio / video source (Digital Source) device such as a digital set-top box or digital VSI via a 1394 serial bus. A standard that defines how to transfer MPEG (Moving Picture Experts Group) streams and On Screen Display (OSD) data. The CEA-775B additionally defines how analog audio / video sources (hereinafter referred to as `` analog sources '') are connected between the source device and the DTV, so that the DTV is connected to an analog video signal input rather than a 1394 connection. It also allows you to accept analog sources from source devices.

As described above, when the DTV supports the CEA-775B for the IEEE 1394 serial interface, the method for verifying the information on the analog video input of the video display device by the source device according to the present invention is proposed for a new AV / C command. This may be, and will be described below with reference to these embodiments.

2 is a diagram illustrating a connection between a DTV and a source device according to an exemplary embodiment. The source device 201 corresponds to the source device 101 of FIG. 1, and the DTV 203 corresponds to the image display device 103 of FIG. 1.

The source device 201 supports the IEEE 1394 interface by the CEA-775B, and can control the DTV 203 by using a predetermined control command according to the CEA-775B standard. At least one type of analog source may be provided to the DTV 203.

The DTV 203 may receive and process a predetermined digital source and an analog source from the source device 201, and the IEEE 1394 interface 205 of the DTV 203 supports the CEA-775B standard. Referring to FIG. 2, the source device 201 may transmit an MPEG TS (Transport Stream) and an OSD to the DTV 203 through a 1394 interface 205 according to the CEA-775B standard. C command) may be used to control the DTV 203. The function of controlling the DTV 203 by the source device 201 includes an analog / digital source selection (external jack selection) function.

In addition, the source device 201 may provide an analog source to the analog input terminal of the DTV 203 through the analog output terminal. Hereinafter, only an analog video signal among analog sources will be described.

The DTV 203 has at least one 'analog video input plug'. Here, a plug is a collection of externally visible components that can be connected to a subunit for transmitting a series of variable-length frames, each of which has an analog video input plug that the DTV 203 has. Each of the physical analog input terminals. Each plug is identified by a plug ID, and the default analog video input plug ID is specified in the descriptor of the DTV.

The source device 201 uses a ANALOG VIDEO INPUT PLUG INFO status command to find out what type of analog video signal the analog video input plug of the DTV 203 actually corresponds to. . 3 and 4, a state command transmitted from the source device 201 to the DTV 203 will be described.

Since the status command and its response are in accordance with the AV / C command as described above, the frame structure shown in FIGS. 3 and 4 below is included in the frame of the AV / C command according to the CEA-775B standard. Therefore, the output status command and the output control command include a 'ctype (command type)' field, a 'subunit_type' field, and a 'subunit_ID' field, which are basically included in the AV / C command, and description thereof will be omitted.

3 is a diagram illustrating a frame of a ANALOG VIDEO INPUT PLUG INFO status command.

The status command is preferably in the form of a basic frame with other control commands (AV / C command) according to the CEA-775B standard, and the embodiment of FIG. 3 is created on such a basis. Referring to FIG. 3, the status command includes OPcode, Operand [0] to Operand [3].

The opcode is for distinguishing a corresponding command transmitted from the source device 201 to the DTV 203 and may use a value that is not duplicated with a previously defined control command (AV / C command). Preferably 26 ₁₆ with Opcode Assign.

Operand [0] to [3] may have a predetermined size, but all four bytes may be allocated, one byte each, to match another control command.

First, Operand [0] includes the type and identifier of the DTV 203, that is, the destination subunit, and corresponds to the destination information. The type (subunit_type) of the destination subunit is the type of the counterpart device, that is, the DTV. The type of the destination subunit includes a video monitor and the like, and may be one already classified according to the CEA-775B standard. The DTV 203 corresponds to a video monitor. The identifier (subunit_ID) of the destination unit may be preset according to the type of the destination subunit. According to the CEA-775B standard classification, '0' corresponds to the DTV.

The type of the destination subunit and the identifier field of the destination subunit are allocated by 5 bits and 3 bits, respectively.

Operand [1] contains the ID of the analog video input plug for which you want information. For Operand [1], 1 byte can be allocated.

When the DTV 203 supports Analog / Digital Source Selection, which will be described below, the ID of the analog video input plug is a plug info block included in the unit identifier descriptor of the DTV 203. You can see it. The analog video input plug ID is an identifier of the analog video input plug and is a value representing a source plug required when the source device 201 selects an analog source as an output.

Operand [1] is not an essential component of the status command, but can be inserted to have the status command in the form of a control command, and according to an embodiment, the DTV 203 is mapped to the ID of the corresponding analog video input plug. It can be used to transmit information about the format of an analog video signal.

Operand [2] and operand [3] are reserved and filled with FF ₁₆ respectively.

When the source device 201 transmits a status command to the DTV 203 according to the CEA-775B standard, the DTV 203 transmits a predetermined response to the source device 201 accordingly.

4 illustrates a frame of a response to a status command. The response to the status command transmitted from the DTV 203 to the source device 201 is preferably in the form of a basic frame with other control commands (AV / C commands) according to the CEA-775B standard. The embodiment is written on such a basis. In addition, the embodiment of FIG. 4 is based on the state command of FIG. 3 and corresponds to the case where an analog video input plug ID is included in Operand [1] of the state command.

Referring to FIG. 4, the response to the status command includes OPcode, Operand [0] through Operand [3]. The OPcode included in the response to the status command is the same as the OPcode included in the status command of FIG. 3.

Operand [0] includes the type and identifier of the source subunit which is the source device 201 and corresponds to the information of the source device 201. Operand [0] allocates 5 bits and 3 bits, respectively, for the type of the source subunit and the identifier of the source subunit.

The type (subunit_type) of the source subunit is that of the source device 201. Types of source subunits include tuners, set-top boxes, and other A / V devices such as VSI, and the like, which are previously classified according to the CEA-775B standard. The identifier (subunit_ID) of the source unit may be preset according to the type of the source subunit. According to the CEA-775B standard classification, '1F ₁₆ ' corresponds to the A / V device.

Operand [1] included in the response to the status command uses the same value as Operand [1] included in the status command of FIG.

The response to the status command can be divided into two types, as described above, a status response and a rejected response. Accordingly, the values of Operand [2] and Operand [3] are different.

The status response includes information on one of the formats of the analog video signal. For example, information on the format of the analog video signal preferred by the DTV 203 is included, or information on the format of the analog video signal mapped to the ID of the corresponding analog video input plug included in the status command is included. .

Operand [2] is information about an analog input type, and Operand [3] is a serial number of a DTV 203 terminal which receives an analog source of a format included in Operand [2].

Table 2 below shows an example of values inserted into Operand [2] corresponding to the analog source format.

Value Analog Input Type 00 ₁₆ Composite 01 ₁₆ S-Video 02 ₁₆ Component 03 ₁₆ ~ FE ₁₆ Reserved FF ₁₆ Invalid (for rejection)

The value in Table 1 indicates the type of analog source corresponding to a given analog video input plug ID. In the example of Table 1, values for the formats of analog sources that are widely used are defined. Analog source types other than the composite, S-video, and component types defined here can be defined by additional assignment among the values left as reserved.

Operand [3] is information on the analog input number (Analog Input No). According to an embodiment, the DTV 203 may support two or more analog inputs of the same type such as supporting two or more composite inputs or two or more component inputs. In this way, when a DTV (203) an input terminal for receiving an analog video signal of the same type than at least one, is assigned a number from 1 to 254 in between the analog input. However, if there is only one analog input terminal for a type (default analog input), the serial number can be defined as 0. Table 2 below shows an example of values inserted into Operand [3] corresponding to the analog source number.

Value Analog Source No 00 ₁₆ Default Input 01 ₁₆ ~ FE ₁₆ Input 1 ~ Input 254 FF ₁₆ Invalid (for rejection)

If the analog source format is 00, when the DTV 203 responds to the status command and returns the information of the analog source corresponding to the analog video input plug in the status response, the source device 201 is included in the status response. By looking at the analog source type and number, you can see what type of analog video signal the analog video input plug is mapped to process.

The rejection response is the destination subunit in the state command if the ID of the analog video input plug included in Operand [1] of the state command is not own, or when the DTV 203 cannot process any analog video signal. This is the case when the information (Operand [1]) is incorrect, and can be used when the status response cannot be made in terms of the other DTV 203. In the case of the rejection response, FF ₁₆ can be inserted as shown in Tables 2 and 3 as the values of Operand [2] and Operand [3].

The status command proposed by the present invention or the response to the status command may be used as a step before the source device 201 uses a predetermined Analog / Digital Source Selection (External Jack Selection) function with respect to the DTV 203.

The Analog / Digital Source Selection (External Jack Selection) function is a function that enables the DTV 203 to support a selected source between an analog source and a digital source under the control of the source device 201 according to the CEA-775B standard. Using this function, instead of transmitting the digital source through the IEEE 1394 bus, the source device 201 transmits the analog source to the DTV 203 through the analog output terminal, and the DTV processes the analog source to a corresponding video. It becomes possible to display.

In order to implement Analog / Digital Source Selection, the source device 201 transmits information on the selected source between the analog source and the digital source to the DTV 203 using a CONNECT command defined in the IEEE 1394 standard. . That is, when the source plug field of the CONNECT command is a digital transport stream input plug (iPCR plug of a 1394 serial bus), a digital source is selected. When the source plug field is an analog video input plug, an analog source is selected. will be.

In this case, the source device 201 may transmit the status command to the DTV 203 prior to transmitting the connection command, so as to confirm in advance information about the analog video signal processed by the DTV 203.

5 is a flowchart provided to explain a process in which a source device outputs a predetermined analog video signal to a DTV, and a method of confirming information on an analog video input of an image display apparatus by a source device according to the present invention is applied. Hereinafter, an example of an output process of an analog video signal made between the DTV 203 and the source device 201 will be described with reference to FIGS. 2 to 5.

The source device 201 receives a command for requesting the DTV 203 to output a predetermined analog video signal from the user, or if necessary (S501), transmits a predetermined status command to the DTV 203. The status command includes an analog video input plug ID. The analog video input plug ID may correspond to one of a plurality of analog video input plugs included in the DTV 203 and may exist in a unit identifier descriptor of the DTV 203. The one identified through the plug info block may be used (S503).

When the DTV 203 receives a status command from the source device 201, the DTV 203 determines whether to perform a status response or a rejection response to the status command, and if the status response is performed, the analog video input included in the status command. Extract information about plug ID. Information on the analog video input plug ID corresponds to the type and number of the analog source (S505).

The DTV 203 transmits a predetermined response (status response or rejection response) to the source device 201 based on the extracted analog video input plug ID information (S507).

The source device 201 informs that the analog video signal is output by transmitting a predetermined connection command to the DTV 203 based on the status response of the DTV 203 (S509).

As described above, a method of confirming information on an analog image input of an image display apparatus by a source device according to an embodiment of the present invention may be applied.

The invention can be implemented in methods, devices and systems. In addition, when the present invention is implemented in computer software, the components of the present invention may be replaced with code segments necessary for performing necessary operations. The program or code segment may be stored on a medium that can be processed by a microprocessor and transmitted as computer data coupled with carrier waves via a transmission medium or communication network.

Media that can be processed by a microprocessor include those capable of transmitting and storing information such as electronic circuits, semiconductor memory devices, ROMs, flash memories, EEPROMs, floppy disks, optical disks, hard disks, optical fibers, wireless networks, and the like. Include. Computer data also includes data that can be transmitted over electrical network channels, optical fibers, electromagnetic fields, wireless networks, and the like.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the above-described specific embodiment, the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

As described in detail above, the source device according to the present invention can identify a format of a video signal that can be processed by the video display device through a predetermined communication interface in providing a predetermined analog video signal to the video display device.

Furthermore, the present invention can be applied to the case where the image display device is a digital TV that supports the CEA-775B standard relating to the IEEE 1394 standard. In this case, when the source device which wants to perform the analog / digital source selection function selects an analog source, it can know what kind of analog video output to output.

Claims (10)

A source device capable of outputting a predetermined analog video signal transmits a status command to the video display device connected through a separate communication interface to request information on the analog video signal that the video display device can process. Making; And And confirming the information by the source device receiving a response transmitted by the video display device based on the transmitted status command. 2. The method of claim 1, And the image display device is a digital TV and the communication interface is an IEEE 1394 serial interface. The method of claim 2, The status command, An opcode indicating an information request for an analog video signal which can be processed by the video display device; Type information (subunit_type) of the video display device; And And an identifier (subunit_ID) of the video display device. The method of claim 3, And the opcode is 26 _{16. The} method for checking information of an analog video input of an image display device. The method of claim 3, The status command, And an analog video input plug ID of the analog video signal input terminal of the video display device. The method of claim 5, The identifier of the analog video signal input terminal of the video display device is included in a plug info block included in a unit identifier descriptor of the digital TV. How to check information about analog video input. The method of claim 2, The response of the video display device is In response to the status command, one of a predetermined status response and a rejection response is transmitted, and when the status response is transmitted, information on a predetermined analog video signal is included in the analog video input of the video display device. How to check information about. The method of claim 7, wherein Information about the predetermined analog video signal, And information on a format of an analog video signal which can be processed by the video display device. The method of claim 7, wherein When the status command includes an identifier of an analog video signal input terminal of the video display device, information about the predetermined analog video signal included in the status response is And a format of an analog video signal corresponding to the identifier and a serial number thereof. The method according to claim 8 or 9, The status response is a value corresponding to the format of the analog video signal, the composite format includes a '0', the S-video format includes a '1', and the component format includes a '2'. To check information about an analog video input of a video display device.

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