KR20080067070A - Method for transmitting and receiving a broadcast signal and apparatus therefor - Google Patents

Abstract

A broadcast signal transceiving method and a broadcast signal receiving apparatus are provided to acquire character information and the display time information of the character information from the audio broadcasting data region of a broadcasting TS and display the character information according to the display time information associated with the character information, thereby controlling a character display time according to the purpose of a transmitter. A broadcast signal transmitting method comprises the following steps of: generating character information displayed by being connected to digital audio broadcasting and the display time information of the character information(S10); inserting the character information and the display time information to an audio broadcasting data region in a broadcasting TS(Transport Stream) and modulating the inserted broadcasting TS(S20); transmitting the modulated broadcasting signal(S30); receiving and modulating the broadcasting signal and outputting the broadcasting TS(S40); acquiring character information and the display time information of the character information from the audio broadcasting data region of the broadcasting TS(S50); and displaying the character information according to the display time information associated with the character information(S60).

Description

Method for transmitting and receiving a broadcast signal and apparatus therefor}

1 is a flowchart illustrating an embodiment of a broadcast signal transmission and reception method according to the present invention.

2 illustrates a protocol stack of a DAB according to Eureka-147.

3 is a diagram illustrating a PAD data region of a frame structure of data of an audio broadcast;

4 is a diagram illustrating an embodiment of a broadcast signal receiving apparatus according to the present invention.

5 is a diagram illustrating a character string expressed according to the expression time information of the character string.

<Description of the code of the main part of drawing>

10: receiver 20: demodulator

30: system decoder 40: audio decoder

45: memory 45 45: control

60: broadcast display unit

The present invention relates to a broadcast signal transmission and reception method and a broadcast signal reception apparatus.

As digital multimedia broadcasting is carried out, it is possible to transmit additional information in addition to the broadcast signal conventionally transmitted. For example, a broadcast signal receiving apparatus for receiving digital multimedia broadcasting (DMB) and digital audio broadcasting (DAB) may provide an additional service using a slide show or a dynamic label segment (DLS). The slide show is a service in which pictures, photos or texts are provided as sequential still images in conjunction with an audio service. The dynamic label segment (DLS) is a string service transmitted in association with audio broadcasting.

The broadcast signal receiving apparatus receives and expresses such an additional service such as a slide show or a character string, but the presentation time of each service may be different from that intended by the broadcast signal transmitter.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a broadcast signal transmission and reception method and a broadcast signal reception apparatus capable of easily controlling the presentation time of an additional service.

According to an aspect of the present invention, there is provided a method of generating text information and presentation time information of a text information linked to digital audio broadcasting, and transmitting the text information and the presentation time information to an audio broadcasting data region of a broadcast transport stream. And inserting and modulating the inserted broadcast transport stream and transmitting the modulated broadcast signal.

In another aspect, the present invention provides a method of receiving and demodulating a broadcast signal to output a broadcast transport stream, obtaining character information and presentation time information of the text information from an audio broadcast data region of the broadcast transport stream, and outputting the text information. It provides a broadcast signal receiving method comprising the step of expressing according to the presentation time information.

In another aspect, the present invention provides a receiver for receiving a broadcast signal including text information and presentation time information of the text information, a demodulator for demodulating the broadcast signal, and a system decoder for outputting an audio broadcast stream from the decoded signal. An audio decoder for outputting the character information and the presentation time information of the character information from the audio broadcast stream, a memory unit for storing the presentation time information of the character information and the character information, and the character information according to the presentation time information And a broadcast output unit for outputting text information according to the control command.

The digital audio broadcasting data area may be a program associated data (PAD) area of digital audio broadcasting (DAB). The character information may be transmitted in a dynamic label segment (DLS). remind The presentation time information It may include a first field indicating the display control information of the character and a second field indicating the expression time of the character. The second field may be a character field of a program associated data (PAD) region of digital audio broadcasting (DAB). The presentation time set in the character field may be based on a standard of universal time coordinated (UTC).

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention that can specifically realize the above object.

1 is a flowchart illustrating an embodiment of a broadcast signal transmission and reception method according to the present invention. An embodiment of a broadcast signal transmission and reception method according to the present invention will be described with reference to FIG. 1.

In operation S10, text information displayed in association with digital audio broadcasting and presentation time information of the text information are generated.

The generated character information and the presentation time information are inserted into the audio broadcast data area of the broadcast transport stream, and the inserted broadcast transport stream is modulated (S20). Digital audio broadcasting may be based on digital audio broadcasting (DAB).

2 is a diagram illustrating a protocol stack of a DAB according to Eureka-147. Digital audio broadcasting (DAB) is based on Eureka-147 (European REserch Coordination Agency project-147) and may have a MSC (Main Service Channel) on which broadcasting data is carried. It includes a fast information channel (FIC) for delivering multiple structures of the broadcast data. Here, the text information and the presentation time information of the text may be carried in a program associated data (PAD) area of the MSC to transmit data linked to an audio broadcast. The character string may be transmitted by a dynamic label segment (DLS), and the slide show may be transmitted according to multimedia object transfer (MOT). For a method of inserting character information and presentation time information of characters into a PAD, see FIG. 4. For example.

The modulation scheme may follow an orthogonal frequency division multiplexing (OFDM) scheme.

The modulated broadcast signal is transmitted (S30).

A process of expressing text information by receiving the above-described broadcast signal is started.

The broadcast signal is received and demodulated to output a broadcast transport stream (S40).

Character information and presentation time information of the character information can be obtained from the audio broadcast data region of the broadcast transport stream (S50). The character information is expressed according to the presentation time information associated with the character information (S60). Therefore, it is possible to solve the problem that the character is different from the audio broadcast time of presentation, and the character display time can be controlled according to the intention of the transmitter.

Hereinafter, an example of expressing text information according to the presentation time of text information will be described. 3 is a diagram illustrating a PAD data area of a frame structure of data of an audio broadcast. For convenience of explanation, an example of transferring presentation time information of character information to an extended program associated data (X-PAD) data area of a DAB will be described.

The DAB may transmit and receive a character string by using a dynamic label segment (DLS) linked to an audio broadcast. The string may be expressed in conjunction with a slide show or the like following the MOT protocol. FIG. 3 illustrates a frame structure of a data area for transmitting and receiving time information on a DLS string.

X-PAD for DLS is a variable that includes a 16-bit prefix field, a character field that is a multiple of 8 bits, and a 16-bit error correction coded with a 16-bit cyclic redundancy check (CRC) field. Data field of length.

The prefix field is a 1-bit toggle field (T), a 2-bit first / last field, a 1-bit command field (C), a 4-bit first field, a 4-bit second field and 4-bit unused. And reserved for future additions (Rfa).

The toggle field is maintained while the same string is sent, and can change as the string changes. The first / last field indicates information that identifies whether a character to be transmitted is the first character or the last character among consecutive strings as 2-bit information of first flag and last flag. In particular, in the case of first flag 1, this may indicate that the first segment of a character is transmitted or that only one segment is transmitted.

The 1-bit command field (C flag) may include a length of 4 bits of the label segment when 0 and a specific command when 1. In the present embodiment, when the command field is 1, control information regarding the expression time of the character is set in the first field. For example, when the first field is 0003, control information of the character display time indicating that the character display time information is set may be set. And. In the case of 0001, the displayed character may be removed from the screen according to the display time information of the set character.

The second field indicates 1-bit reserved for future additions and 3-bit segment number when the first flag is 0. In particular, the second field may represent a number less than 1 as the current segment in binary. have.

On the other hand, when the first flag is 1, the second field sets presentation time information of a 4-bit string. For example, when the value of the second field is 0001, the display time of the character may be set in the character field, and the display time may be displayed according to the display time set in the character field. When the value of the second field is 0002, the time determined by the UTC (Universal Time Coordinate) reference value defined by extension 10 of type 0 of FIG (fast information group) included in the FIC may be expressed.

The character field is an integer-length variable length field of 8 bits. Therefore, for example, time information inserted in the character field can be inserted and transmitted. For example, the display time can be set for each specific unit such as hours, minutes, seconds, milliseconds (indicated by yymmdd in FIG. 3).

Therefore, when expressing a DLS string, the string may be expressed at a corresponding time by referring to the prefix field of the X-PAD and the expression time information of the character set in the character field.

4 is a diagram illustrating an embodiment of a broadcast signal receiving apparatus according to the present invention. An embodiment of a broadcast signal receiving apparatus according to the present invention will be described with reference to FIG. 4.

The apparatus for receiving broadcast signals according to the present invention includes a receiver 10, a demodulator 20, a system decoder 30, an audio decoder 40, a memory 45, a controller 50 and a broadcast display unit 60. ) May be included.

The receiver 10 may select and receive a broadcast signal of a channel desired by a user. For example, the receiver 10 may receive a broadcast signal conforming to the DAB standard according to Eureka-147.

The demodulator 20 may demodulate the signal received by the receiver 10. For example, the demodulator 20 may demodulate a received signal according to an OFDM scheme, perform channel compensation in consideration of channel distortion of the demodulated signal, and output the demodulated signal.

The system decoder 30 may demultiplex and output the audio broadcast data from the broadcast stream output by the demodulator 20.

The audio decoding unit 40 obtains the character information included in the PAD area or the presentation time information of the character information among the areas of the audio broadcast data decoded by the system decoding unit 30, and outputs the obtained character information and the presentation time information. . The memory unit 45 may store character information or display time information output by the audio decoding unit 40.

The controller 50 may receive the character information and the presentation time information output by the audio decoding unit 40 or stored in the memory unit 45 and display the character information according to the presentation time information. The broadcast display unit 60 may display a character string according to the character information and the display time information output by the audio decoder 40 or stored in the memory unit 45 according to a control command of the controller 50.

Although the example of controlling the presentation time of the character string has been shown above, the content that may be provided as an additional data service in the data area of the audio broadcast may be similarly controlled. For example, the presentation time of the slide show according to the MOT protocol may also be controlled according to the presentation time information of the PAD data region described above.

5 illustrates a character string expressed according to the character string and the expression time information of the character string according to the broadcast signal transmission and reception method according to the present invention. FIG. 5 may show a slide show related to audio when audio is output according to digital audio broadcasting. For example, an album singer, a scenery, or the like of the singer of the output audio may be expressed. And, the DLS string may be displayed at the bottom. The DLS string and the slide show can be synchronized with the output audio and can easily control the presentation time of the additional data according to the audio service.

It is easy for a person skilled in the art to change or modify the present invention from the present specification. Therefore, although an embodiment of the present invention has been described above clearly, various modifications thereof should be made without departing from the spirit and the scope of the present invention.

The effects of the broadcast signal transmission and reception method and the broadcast signal reception apparatus according to the present invention described above are as follows. According to the broadcast signal transmission and reception method and the broadcast signal reception apparatus according to the present invention, it is possible to easily control the presentation time of additional data services such as character strings.

Claims (14)

Generating text information displayed in association with digital audio broadcasting and presentation time information of the text information; Inserting the text information and the presentation time information into an audio broadcast data region of a broadcast transport stream and modulating the inserted broadcast transport stream; And Transmitting the modulated broadcast signal. The method of claim 1, The digital audio broadcasting data area is a program associated data (PAD) area of digital audio broadcasting (DAB). The method of claim 1, remind The presentation time information And a second field indicating the expression time of the character and a first field indicating the expression control information of the character. The method of claim 3, wherein The second field is a character field of a program associated data (PAD) region of digital audio broadcasting (DAB). The method of claim 4 The presentation time set in the character field is a broadcast signal transmission method according to a standard of universal time coordinated (UTC). Receiving and demodulating a broadcast signal to output a broadcast transport stream; Obtaining character information and presentation time information of the character information from an audio broadcast data region of the broadcast transport stream; And And displaying the text information according to the presentation time information. The method of claim 6, The audio broadcasting data area is a program associated data (PAD) area of digital audio broadcasting (DAB). The method of claim 6, The presentation time information of the character information includes a first field representing the presentation control information of the character information and a second field representing the presentation time of the character. The method of claim 8, The first field is a prefix field of a program associated data (PAD) region of digital audio broadcasting (DAB), and the second field is a character field. The method of claim 9 The presentation time set in the character field is a broadcast signal receiving method according to a standard of universal time coordinated (UTC). The method of claim 6, The text information is transmitted in a dynamic label segment (DLS). A receiver configured to receive a broadcast signal including text information and presentation time information of the text information; A demodulator for demodulating the broadcast signal; A system decoder for outputting an audio broadcast stream from the decoded signal; An audio decoder for outputting the text information and presentation time information of the text information from the audio broadcast stream; A memory unit for storing the character information and the presentation time information of the character information; A control unit which controls to output the text information according to the presentation time information; And And a broadcast output unit configured to output text information according to the control command. The method of claim 12, And the presentation time information of the character information is transmitted to a prefix field indicating presentation control information of the character information and a character field indicating the presentation time of the character. The method of claim 12, And the text information is transmitted in a dynamic label segment (DLS).

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