KR20060104482A - Display method for caption data based dtvlink - Google Patents

Abstract

The present invention relates to a method for displaying caption data based on DTVLink. In particular, the caption data such as lyrics or subtitles separated from the stream can be transmitted through an asynchronous connection to display captions or lyrics with the stream on the screen of the consumer. There is a purpose. In accordance with an aspect of the present invention, a method of transmitting data by connecting at least one producer and a consumer via a serial bus, wherein the producer and the consumer are connected, informing a counterpart device of whether to support caption data transmission. And, when the link connection is started, the consumer displays a list of a plurality of producers connected to the network, and when a caption function is set by a user and an arbitrary producer is selected, attempting a separate asynchronous connection. If so, the consumer requests the caption data from the selected producer, and the consumer receives the stream and caption data from the producer and displays the caption data along with the corresponding video.

Description

Display method of caption data based on DTV display {DISPLAY METHOD FOR CAPTION DATA BASED DTVLink}

1 is a control block diagram of a video device using a general DTVLink.

2 is a control configuration diagram of a video device using conventional EIA / CEA-931 and DTVLink.

3 is a structural diagram of an EIA-775 plug info block according to the present invention;

4 is a structural diagram of an EIA-775 DTV info block according to the present invention;

5 is a structural diagram of an EIA DTV profile level field in FIG. 4; FIG.

6 is a structural diagram of a miscellaneous feature field in FIG. 4;

FIG. 7 is a structural diagram of a caption formats supported field in FIG. 4; FIG.

8 is a structural diagram showing a frame format of caption data according to the present invention;

9 is a flowchart illustrating a caption data display process according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

210: producer 220: consumer

The present invention relates to digital TV (DTV), and more particularly, to a caption data display method using DTVLink.

In order to explain the present invention, the following components are defined.

On-Screen Display (hereinafter, abbreviated as "OSD") is used to mean a menu screen used to control home appliances.

Producers are A / V sources that send streams and OSD data to control them, such as set-top boxes and DVHS.

A consumer is a device that displays a stream or OSD data sent by a producer. There is a DTV. In this specification, DTV is used in the same sense as a consumer.

The EIA-775-A is a specification for providing a baseband digital interface using an IEEE-1394 bus between a DTV and a producer. It provides a level of functionality similar to that of an analog system. It can also provide compatibility between ETV-compliant DTVs and digital A / V sources such as digital set-top boxes, analog / digital hard disks, and video cassette recorders.

EIA-799 is a standard that defines the OSD format that should be used when transmitting OSD from EIA-775-A.

EIA / CEA-931 is a standard that can transmit key value through user's remote control input or panel operation to corresponding device through AV / C command.

EIA / CEA-849 is a specification that defines application profiles for DTVs that comply with EIA-775-A. Applications include ATSC terrestrial, DBS (Direct Broadcast Satellite), US Cable, and DV camcorders.

IEEE 1394, a serial bus interface standard jointly proposed by Apple and Texas Instruments in 1986, was developed for large-capacity multimedia data exchange between AV devices and became an industry standard in 1995.

The biggest feature of IEEE 1394 is that it can transmit 100 ~ 400Mbps at high speed, and it is currently being developed to transmit at 800Mbps and 1.6Gbps, so it is possible to directly connect multimedia peripheral devices such as scanner, digital camera, digital video camera, etc. By connecting, you will be able to use digital audio or video information in real time.

In addition, since IEEE 1394 supports asynchronous transfer and isochronous transfer, it is suitable for high-definition video transmission that should guarantee real-time transmission.

The physical advantages of IEEE 1394 include the ability to connect several types of peripherals into a single, simple, common plug-in serial connector and use a thin serial cable rather than a thick parallel cable.

It also supports Hot Plug and Plug and Play for uninterrupted use of the device and the ability to connect peripherals in a variety of ways, without the need for termination or complex setups. .

With the above features, there are more and more products supporting IEEE 1394, including products such as digital camcorders, digital video editing equipment, digital VCRs, digital cameras, digital audio players, 1394 ICs, connectors, cables, and tests. 1394 basic parts such as equipment and software toolkits are being announced one after another, and this trend is expected to continue.

On the other hand, DTVLink is a method using IEEE 1394.

As shown in FIG. 1, when controlling a video device using a general DTVLink, a remote controller or a panel must be operated for each of the devices to control the A / V source device 110 and the DTV 120 connected to the 1394 Link. do.

In this case, the A / V source device 110 transmits the stream and the OSD to be displayed on the screen of the DTV 120.

Accordingly, the user controls the A / V source device 110 while viewing the OSD displayed on the screen of the DTV 120.

In addition, the conventional EIA / CEA-931 and the control of the video device using the DTVLink, as shown in FIG. By using the remote control of various products, you can eliminate the inconvenience. To this end, producers and consumers should be implemented in accordance with the standards of EIA-775-A, EIA / CEA-849, EIA-799, and EIA / CEA-931.

By the way, there are a variety of A / V sources that can be a producer (DVHS, set-top box, DVD, etc.).

Therefore, some producers may have caption data corresponding to subtitles or lyrics separately from the stream. The caption data should be sent to the consumer and displayed according to the user's request of the consumer.

Although not mentioned in the current EIA-775-A specification, the 1394 trade association's AV / C Commands for Management of Asynchronous Serial Bus Connections 1.1 states that the transfer of lyrics is possible via an asynchronous connection, just like the OSD.

Accordingly, the present invention provides a method for displaying caption data based on DTVLink, which is capable of displaying caption data such as lyrics or subtitles separated from a stream through an asynchronous connection to display captions or lyrics with the stream on the screen of a consumer. The purpose is.

The present invention provides a method of transmitting data by connecting at least one producer and a consumer to a serial bus in order to achieve the above object, and supports caption data transmission to an external device when the producer and the consumer are connected. Indicating whether or not, when the link connection is initiated, the consumer displays a list of a plurality of producers connected to the network, when the caption function is set by the user and a random producer is selected, attempting a separate asynchronous connection; And when the asynchronous connection is established, the consumer requests the caption data from the selected producer, and the consumer receives the stream and the caption data from the producer and displays the caption data along with the corresponding video. It is done.

In addition, the process is configured to perform a step of releasing a separate asynchronous connection when the transmission of caption data is completed, and notifying the user by passing a rejected response to the consumer if the producer does not have the caption data. It features.

To this end, the present invention is implemented to have the following features.

The first feature of the present invention is to expand the miscellaneous features fields of the EIA-775 plug info and the DTV info block in the EIA-775-A specification so that the consumer and the producer know whether the external device supports caption data transfer. That is, the consumer indicates that caption data transfer is supported by allocating one bit of miscellaneous features field of DTV info block, and the producer indicates that the caption data transfer is supported by using reserved field of EIA-775 plug info.

A second aspect of the invention specifies the information of a plug to be used in caption data transfer to the consumer's EIA-775 plug info. In other words, a new asynchronous connection is established by using a new plug ID instead of the plug used to deliver the OSD. This allows the producer to send OSD and caption data without affecting each other.

A third aspect of the invention defines the caption data format that can be displayed in the consumer in the DTV info block. That is, the caption data format that can be displayed by the consumer is designated for each bit by allocating 24 bits of the reserved area of the DTV info block. This allows the producer to recognize that the consumer can only display for formats where the bit is "1".

A fourth aspect of the invention defines and uses a new frame format in delivering caption data from the producer to the consumer. The contents of the new frame format include caption data format, corresponding frame length, and subframe presence information to be processed next to the corresponding frame in case of being transmitted by being divided into subframes.

A fifth aspect of the present invention is that the caption data display can be arbitrarily selected by the user. In other words, when the user sets the caption data display through the operation of the consumer's GUI or the remote control, the consumer requests the caption data as the producer, the producer transmits the caption data through a separate asynchronous connection, and the caption data transmission is When complete, release a separate asynchronous connection.

Accordingly, the present invention delivers caption data such as subtitles or lyrics separated from the producer's stream to the consumer through an asynchronous connection so that the consumer displays the lyrics or subtitles simultaneously with the stream so that the user can view the lyrics or subtitles. do.

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

In describing the preferred embodiment of the present invention, a detailed description of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

The configuration of the DTVLink for implementing the present invention is the same as that of FIG.

영역에 캡션 데이터를 지원하는지를 기록하고,

,

영역에 캡션 데이터 전송 시에 이용될 플러그(plug)의 ID를 기록한다. Figure 3 shows the structure of the EIA-775 plug info extended for caption data delivery. That is, the existing reserved area

Record whether the area supports caption data,

,

In the area, the ID of a plug to be used when transferring caption data is recorded.

FIG. 4 illustrates the structure of the EIA-775 DTV info block. As shown in FIGS. 5 to 7 with respect to caption data support, the EIA DTV profile level and miscellaneous features are expanded and set.

The EIA DTV profile level means 1394 bus speed, IEC 61833-1, a digital interface standard, IEC 61883-4 for MPEG TS transmission, support of AV / C General Command Set, decoding all ATSC video formats, and OSD transmission. Whether it supports local based updates, is it possible to extend the OSD to 14: 9 or 16: 9, and what are the supported OSD formats?

EIA-775-A defines three EIA DTV profile levels such as "A", "B", and "Ala Carte" by allocating 0, 1, and 255 values. An 8-bit field is allocated for this purpose, and the higher the order of the alphabet, the lower the backward compatibility. For example, EIA-Profile "B" should include all the features that EIA-Profile "A" supports.

EIA-profile "Ala Carte" is a profile used by consumers, not DTV, for example, when the producer's OSD is displayed on the screen of a DVC camcorder.

Therefore, as shown in FIG. 5, a new profile for caption data support is defined, so that the producer can see the profile level of the consumer's DTV info and then the consumer can support the caption data.

FIG. 6 illustrates an extended structure of the miscellaneous features field of the DTV info block, and may indicate whether caption data is supported by allocating one bit of an existing reserved area.

~

을 할당하여 현재 컨슈머가 어떤 캡션 포맷을 지원하는지 나타내도록 하며, 정의된 캡션 포맷에 해당하는 비트를 "0"과 "1"로 나타낸다. 7 is a reserved area of a DTV info block

To

Is assigned to indicate which caption format the current consumer supports. Bits corresponding to the defined caption format are represented by "0" and "1".

Although only the smi format is defined in FIG. 7, allocation for a new caption data format may be added. The structure of management information (smi) is a management information structure that defines a data structure, data format, and management information name used for defining a simple network management protocol (SNMP) or management information base (MIB). The basic part is defined in RFC 1155 and the details are defined in RFC 1212.

8 shows the format of a frame to be used in caption data transmission. Components of a frame include a caption format, a bit indicating that there is another frame after the current frame, and a caption data length. The caption format is a value referring to FIG. 7 and has a value of "1" in the case of a currently defined smi file type.

If the amount of caption data is larger than 224 bytes, which is a length that can be included in the frame format of FIG. 8, the caption data may be divided in subframe units. At this time, the presence or absence of the next subframe is represented by "0" and "1" using n fields. That is, n is "1" if there is a next subframe, and n is "0" otherwise.

Accordingly, a process of displaying caption data using the function defined above will be described with reference to FIG. 9.

2, the A / V source device 210 and the DTV 220 will be referred to as a producer and a consumer, respectively.

First, when the consumer 220 and the producer 210 are connected through a 1394 link, each device acquires a unit identifier descriptor of the counterpart device using a READ descriptor and an OPEN descriptor command.

영역에 "1" 값이 기록되고,

영역에 캡션 데이터 전송 시에 이용될 유효한 출력 플러그 ID 값이 기록된다. If the producer 210 supports caption data, EIA-775 plug info

The value "1" is recorded in the area,

In the area, a valid output plug ID value to be used when transferring caption data is recorded.

영역에 캡션 데이터 전송 시에 이용될 유효한 입력 플러그 ID값이 기록된다. In addition, if the consumer 220 supports the caption function, the EIA-775 plug info

In the area, a valid input plug ID value to be used for caption data transmission is recorded.

~

영역에 지원 가능한 캡션 포맷에 대한 정보가 포함된다. Also, EIA DTV profile level of DTV info should be set to "2", EIA Profile "C", 6th bit of miscellaneous features is "1", and

To

Information about the caption formats that can be supported in the area is included.

Then, when the user selects the DTVLink menu, the screen of the consumer 220 displays information on whether the producer supports caption data together with a list of producers connected thereto.

Here, it is assumed that the producer 210 of FIG. 2 supports caption data.

At this time, when the user selects the producer 210, the consumer 220 asks whether to display caption data through its GUI, and the user responds to this.

Accordingly, when the user sets up the display of the caption data, a new connection is established between the consumer 220 and the producer 210 through the plug ID defined in the EIA-775 plug info separately from the asynchronous connection for the existing OSD. Done.

Accordingly, the consumer 220 transmits the ALLOCATE_ATTACH command to the producer 210 based on the plug ID for caption data transmission, receives the caption data through the frame format of FIG. 8, and transfers the caption data. If the n field of the frame of 8 is "0", the connection is released by transmitting a DETACH_RELEASE command.

Thereafter, the consumer 220 displays the caption data on the screen in synchronization with the stream synchronization.

This process can be performed even while the user is watching the stream.

However, the producer 210 sends a REJECTED response to the ALLOCATE_ATTACH command delivered by the consumer 220 even if the caption function has no caption data for the corresponding stream even if the caption function is provided. To allow the user to recognize it.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims below. There will be.

As described in detail above, the present invention enables the transmission of caption data from a producer having caption data to a consumer separately from the stream to display the OSD as well as the caption data on the screen of the consumer according to the user's selection. It can improve the performance of the device as well as to meet the user's satisfaction.

In addition, the present invention is easy to implement by simply extending the specification.

Claims (7)

A method of transmitting data by connecting at least one producer and a consumer to a serial bus, When the producer and the consumer are connected, informing the counterpart device of whether to support caption data transmission; When the link is initiated, the consumer displays a list of multiple producers connected to the network; When the caption function is set by the user and a random producer is selected, attempting a separate asynchronous connection, Requesting, by the consumer, the caption data from the selected producer when the asynchronous connection is established; And a consumer receiving the stream and the caption data from the producer and displaying the caption data together with the corresponding video. The method of claim 1, wherein the step of notifying whether the caption function is supported is The process of delivering information to the producer connected to the consumer, including whether the caption function is supported, the caption format supported, and the EIA DTV profile level; A method for displaying caption data based on a DTVLink, characterized in that the producer transmits caption data, caption data input and output plug information to the consumer. The method of claim 1, wherein the caption data frame provided from the producer includes a caption format, a corresponding frame length, and information on whether or not a subframe exists. The method of claim 1, wherein the caption data request uses an IEEE 1394 based ALLOCATE_ATTACH command. 2. The method of claim 1, further comprising releasing a separate asynchronous connection when transmission of caption data is completed. 3. The method of claim 5, wherein the asynchronous connection release uses an IEEE 1394-based DETACH_RELEASE command. The DTVLink-based caption data display method of claim 1, further comprising: notifying the user by transmitting a rejected response to the consumer when the producer does not have the caption data.

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