KR20080073435A - Digital broadcasting transmitter, digital broadcasting receiver and system and method for serving digital broadcasting - Google Patents

Abstract

A digital broadcasting transmitter, a digital broadcasting receiver, a digital broadcasting system and a service method thereof using the same are provided to insert data associated with music about a corresponding broadcast program to an AC-3 audio descriptor in a TS, transmit the AC-3 audio descriptor, extract the data associated with music from the AC-3 audio descriptor of the received TS, and display the data on a screen, thereby enabling a user having the previous version of the digital broadcasting receiver to receive information associated with music about the broadcast program without a separate device. A method for providing digital broadcasting comprises the following steps of: inserting data associated with music to the text[i] field and additional_info[i] field of an AC-3 audio descriptor and multiplexing the data(S100); dividing a TS(Transport Stream) into a video stream, an audio stream, and a data stream(S110); extracting the AC-3 audio descriptor from the data stream(S120); extracting the data associated with music from the text[i] field and the additional_info[i] field(S130); generating an OSD(On Screen Display) signal according to the data(S140); and displaying the generated OSD signal on a screen(S150).

Description

Digital Broadcast Transmitter and Digital Broadcast Receiver, Digital Broadcasting System and Service Method Using the Same {Digital Broadcasting Transmitter, Digital Broadcasting Receiver and System and Method for Serving Digital Broadcasting}

1 is a block diagram showing the configuration of a digital broadcast transmitter of the present invention.

2 is a block diagram showing a configuration of a digital broadcast receiver of the present invention.

3 is a flowchart illustrating an embodiment of a digital broadcast service method of the present invention.

Explanation of symbols on the main parts of the drawings

100: MPEG-2 Encoder 110: AC-3 Encoder

120: transmission multiplexer 130: modulator

140: transmitter 200: broadcast receiver

210: demultiplexer 220: memory

230: music information extraction unit 240: OSD processing unit

250: image processor 260: display unit

270: voice processing unit 280: speaker

290: control unit

The present invention relates to a digital broadcast transmitter and a digital broadcast receiver, a digital broadcast system using the same, and a service method thereof.

Recently, with the development of digital technologies such as digital image compression and digital modulation / demodulation, the standardization and commercialization of digital television broadcasting is rapidly progressing. In the conventional terrestrial, satellite, and cable broadcasting, MPEG (Moving Picture Experts Group) Based on the trend is becoming digital.

In digital broadcasting, a plurality of broadcast programs encoded on the basis of MPEG are multiplexed and transmitted in the form of a transport stream. The transport stream is received by a digital broadcast receiver such as a set-top box (STB) and inversed. Multiplexed.

Therefore, only one broadcast program desired by a user can be selected. Also, in a digital broadcast receiver such as a set-top box, a general television after restoring the selected broadcast program to an original audio and video signal using an MPEG decoder included in the receiver Output to an audio / video output device such as

In addition to providing a unidirectional broadcast program service, an Internet set-top box is provided to provide an interactive service that enables web search through a television screen.

In digital broadcasting, a video stream of digital broadcasting signals is compressed using an MPEG-2 compression algorithm, and an audio signal is compressed using an AC-3 compression algorithm, and then multiplexed into one packetized bit stream. It is carried on a carrier in the form of (Transport Stream: TS).

On the other hand, users can enjoy music in the digital broadcasting through a portable audio device or a multimedia device, and in particular, the music used in dramas or other broadcasting programs is gaining popularity, and related services are provided through services such as the Internet or portable terminals. The situation is looking for music information.

In other words, the current digital broadcasting is unable to provide the relevant music information, and users are experiencing a lot of inconvenience because they are getting the relevant music information through a service using the Internet or a portable terminal.

In the future, it is expected that digital broadcasting can provide related music information, but consumers who have previously purchased digital broadcasting receivers cannot receive such services.

Accordingly, there is a need for a method for receiving related music information even from a digital broadcasting receiver owned by the user.

The present invention has been made to solve this problem, by inserting and transmitting the music-related data for the broadcast program to the AC-3 Audio Descriptor in the transport stream (Transport Stream), the existing ATSC (Advanced Television System Committee) standard It is to provide a digital broadcast transmitter that can transmit music-related data without any change.

Another object of the present invention is to provide a digital broadcast receiver that can receive music-related information without additional equipment by extracting the music-related data from the AC-3 Audio Descriptor of the received transport stream on the screen.

It is still another object of the present invention to insert music-related data for a broadcast program into an AC-3 Audio Descriptor in a transport stream, transmit the received data, and after receiving the transmitted transport stream, the music in the AC-3 Audio Descriptor. The present invention provides a digital broadcasting service system and method for extracting related data and displaying the same on a screen to transmit music-related data without changing the existing ATSC standard, and to receive music-related data from a conventional digital broadcasting receiver. have.

A preferred embodiment of the digital broadcast transmitter of the present invention is an MPEG-2 encoder that receives an image signal and encodes it using an MPEG-2 compression algorithm, and an AC- that receives an audio signal and encodes it using an AC-3 compression algorithm. A three- encoder, a transmission multiplexer for receiving multiplexed image data encoded by the MPEG-2 encoder, audio data encoded by the AC-3 encoder, additional service data, and music-related data and outputting a transport stream; and the transmission multiplexer. And a broadcast transmitter configured to modulate the transport stream output from the transmitter and transmit the modulated stream to the outside. The transport multiplexer inserts the music-related data into an AC-3 audio descriptor and multiplexes it.

A preferred embodiment of the digital broadcast receiver of the present invention includes a broadcast receiver for receiving a transport stream transmitted by a digital broadcast transmitter, a demultiplexer for separating the transport stream received by the broadcast receiver into a video stream, an audio stream, and a data stream; A memory storing a data stream separated by the demultiplexer, a music information extracting unit extracting music-related data from an AC-3 audio descriptor of the data stream stored in the memory, and an OSD according to the music-related data extracted from the music information extracting unit An on-screen display (OSD) processor for generating a signal, an image processor for decoding a video stream separated by the demultiplexer, and then synthesizing the decoded image signal with an OSD signal generated by the OSD processor; Display video signal and OSD signal on the screen Shiha comprises a display unit.

A preferred embodiment of the digital broadcast service system of the present invention includes a digital broadcast transmitter for inserting and transmitting music-related data for a broadcast program into an AC-3 audio descriptor in a transport stream, and receiving the transport stream. After that, it comprises a digital broadcast receiver for extracting the music-related data from the AC-3 Audio Descriptor to display on the screen.

According to a preferred embodiment of the digital broadcast service method of the present invention, inserting and transmitting music-related data for a broadcast program into an AC-3 audio descriptor in a transport stream, and after receiving the transport stream, And extracting music-related data from the AC-3 Audio Descriptor and displaying it on the screen.

Hereinafter, a digital broadcast service system and a method thereof of the present invention will be described in detail with reference to FIGS. 1 to 3. In describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification.

1 is a block diagram showing the configuration of a digital broadcast transmitter of the present invention.

As shown therein, the MPEG-2 Encoder 100, the AC-3 Encoder 110, the Transport Multiplexer 120, the Modulator 130, and the Transmitter 140).

Here, the MPEG-2 encoder 100 receives an image signal, encodes it using an MPEG-2 compression algorithm, and outputs the encoded signal to the transmission multiplexer 120.

The AC-3 encoder 110 receives a voice signal, encodes it using an AC-3 compression algorithm, and outputs it to the transmission multiplexer 120.

The transmission multiplexer 120 multiplexes the video data encoded by the MPEG-2 encoder 100, the audio data encoded by the AC-3 encoder 110, additional service data, and input music-related data by multiplexing a transport stream ( Create a Transport Stream.

The additional service data includes program specific information (PSI), program and system information protocol (PSIP) information, and the like.

The PSI is composed of a total of four tables such as a program association table (PAT), a program map table (PMT), a network information table (NIT), and a conditional access table (CAT).

The PSIP includes a table such as a system time table (STT), a master guide table (MGT), a virtual channel table (VCT), a rating region table (RTT), an event information table (EIT), and an extended text table (ETT). .

The music-related data includes information such as a music title, artist, genre, and the like.

The modulator 130 modulates and outputs a transport stream generated by the transport multiplexer 120.

In this case, the modulation method is determined according to the digital broadcasting method. In the case of the Advanced Television System Committee (ATSC) method, 8-VSB (Vestigial Side Band) modulation method is used.

The transmitter 140 transmits the transport stream output from the modulator 130 to the outside through a specific frequency band.

The digital broadcast transmitter of the present invention is characterized by multiplexing and transmitting not only video data, audio data, and additional service data (PSI and PSIP) but also music related data for an audio signal.

In this case, the transmission multiplexer 120 multiplexes the music-related data using the AC-3 Audio Descriptor.

In the case of the AC-3 Audio Descriptor, there is an item that can be used variably so that the AC-3 Audio Descriptor can provide music-related data about an audio signal to the user.

The AC-3 Audio Descriptor has a general syntax as shown in Table 1.

Syntax No.of Bits Mnemonic Audio_stream_descriptor () {descriptor_tag descriptor_length sample_rate_code bsid bit_rate_code surround_mode bsmod num_channels full_svc  8 8 3 5 6 2 3 4 1  uimsbf uimsbf bslbf bslbf bslbf bslbf bslbf bslbf bslbf   langcod 8 bslbf   if (num_channels == 0) langcod2  8  bslbf   if (bsmod <2) {mainid reserved} else asvcflags  3 5 8  uimsbf bslbf bslbf   textlen text_code for (i = 0; i <M; i ++) {text [i]} 7 1 8 uimsbf bslbf bslbf   for (i = 0; i <N; i ++) {additional_info [i]}}  N × 8  bslbf

In Table 1, descriptor_tag is a field for identifying whether the descriptor is an AC-3 audio descriptor, descriptor_length is a field indicating the number of bytes (ie, length) of the descriptor, and sample_rate_code is a field indicating the sample rate of encoded audio. bsid is a field indicating bit stream identification.

Surround_mode is a field indicating a surround mode of audio, and bsmod is a field indicating a bit stream mode, and identifies AC-3 audio services by this field.

In addition, num_channels is a field indicating the number of channels in an audio stream, full_svc indicates whether an audio service provides all audio services or a partial audio service, and langcod is a language code. Allows you to select a broadcast in a specific language. Mainid is a field that indicates the ID of the main audio service.

textlen is a field indicating the number of bytes (length) of the text field (text [i]), text_code is a field indicating how the text field (text [i]) is encoded, and text [i] is a short character of the audio service. This field contains information.

The field used in the present invention is a text [i] field. As described above, it can be seen that the number of bytes of the text [i] field is 128 bytes from the textlen field.

Therefore, when the size of the information included in the text [i] field is 128 bytes or less, music-related data such as a music title, artist, genre, or the like may be inserted into an empty space.

If the size of the information included in the text [i] field is 128 bytes or 128 bytes or less, if the information is close to 128 bytes, the music-related data may be inserted using the additional_info [i] field.

Since the additional_info [i] field is provided to include additional information in the descriptor, music-related data may be inserted therein.

In the case of using the additional_info [i] field, the number of bytes of the descriptor may be adjusted by the size of the music-related data inserted into the additional_info [i] field in the descriptor_length field.

That is, in the present invention, music-related data is first inserted by using the text [i] field. Since the text [i] field may represent only 128 bytes of information, it is secondaryly related to music by using the additional_info [i] field. Insert data.

In this case, the ID3 tag used in an existing MP3 or the like may be used as a method of inserting music-related data. In the case of an MP3 format audio data file, description text and other additional data related to the audio data file are stored and displayed in the ID3 tag. .

The ID3 tag includes additional information related to an audio data file such as a song name, artist, album name, production year, album track information, lyrics, and genre of the corresponding song. The ID3 tag includes an ID3 v1.1 tag according to a version. ID3 v2 tags.

In the present invention, since the text [i] field may represent only 128 bytes of information, it is preferable to use ID3 v1.1 version indicating 128 bytes of information.

The ID3 v1.1 tag has an ID3 tag header assigned with 3 bytes, a title assigned with 30 bytes, an artist assigned with 30 bytes, an album assigned with 30 bytes, and 4 A total of 128 bytes of information is displayed, consisting of a year with bytes assigned, a comment with 28 bytes, an album track with 2 bytes allocated, and a genre with 1 bytes allocated. Can be.

As such, using the AC-3 Audio Descriptor, music-related data can be inserted without changing the existing ATSC standard, and consumers who have previously purchased a digital broadcasting receiver can be provided with music information.

2 is a block diagram showing the configuration of a digital broadcast receiver of the present invention.

As shown in the drawing, the digital broadcast receiver of the present invention includes a broadcast receiver 200, a demultiplexer 210, a memory 220, a music information extractor 230, an OSD (On Screen Display) processor 240, and an image processor. 250, a display unit 260, a voice processing unit 270, a speaker 280, and a control unit 290.

Here, the broadcast receiver 200 includes a tuner and a demodulator, and receives a broadcast signal selected by a user from among broadcast signals input through an antenna or a cable, and outputs a transport stream.

The broadcast receiving unit 200 obtains a real stream of bit streams from a broadcast signal through demodulation of a demodulator according to a modulation scheme after synchronizing sync with a channel selected by a user.

The demultiplexer 210 demultiplexes a transport stream output from the broadcast receiver 200 into a video stream (MPEG-2 bitstream), an audio stream (AC-3 bitstream), and a data stream.

The data stream includes program specific information (PSI), program and system information protocol (PSIP), and music related data.

The memory 220 stores the data stream separated by the demultiplexer 210 in a corresponding area for each broadcast program.

The music information extractor 230 extracts music-related data of a corresponding broadcast program from the memory 220.

That is, the music information extractor 230 extracts the AC-3 Audio Descriptor from the data stream stored in the memory 220, and then checks the text [i] field and the additional_info [i] field of the AC-3 Audio Descriptor to relate to music. Find and print data.

The OSD processor 240 generates an On Screen Display (OSD) signal according to music-related data output from the music information extractor 230 and transmits the OSD signal to the image processor 250.

The image processor 250 includes an MPEG-2 decoder, decodes an image stream separated by the demultiplexer 210 into an image signal, and synthesizes the decoded image signal and an OSD signal generated by the OSD processor 240 to output the synthesized image stream. do.

The display unit 260 displays a signal output from the image processor 250 on a screen so that the user can check not only a broadcast program but also music related information.

The voice processor 270 includes an AC-3 decoder, and decodes the voice stream separated by the demultiplexer 210 into a voice signal.

The speaker 280 outputs the voice signal decoded by the voice processor 270 to the outside.

The controller 290 causes the music information extraction unit 230 to extract music-related data from a data stream stored in the memory 220, and transmits the extracted music-related data to the OSD processor 240.

3 is a flowchart illustrating an embodiment of a digital broadcast service method of the present invention.

As shown here, the transmission multiplexer 120 of the digital broadcast transmitter inserts and inputs music-related data into a text [i] field and an additional_info [i] field of the AC-3 Audio Descriptor and multiplexes it (step S100).

Next, the modulator 130 of the digital broadcast transmitter modulates the transport stream generated by the transmission multiplexer 120 and transmits the modulated stream to the outside through the transmitter 140 (step S 110).

Subsequently, the broadcast receiving unit 200 of the digital broadcast receiver receives the transport stream, the demultiplexer 210 separates the transport stream into a video stream, an audio stream, and a data stream, and then stores the separated data stream in the memory 220. (Step S 120).

Subsequently, under the control of the controller 290, the music information extracting unit 230 extracts an AC-3 audio descriptor of the broadcast program from the data stream stored in the memory 220 (step S 130).

The music information extracting unit 230 checks the text [i] field and the additional_info [i] field in the AC-3 Audio Descriptor to extract music-related data (step S 140).

Next, the controller 290 transmits the extracted music-related data to the OSD processing unit 240, and the OSD processing unit 240 generates an OSD signal according to the music-related data (step S 150).

Subsequently, the image processor 250 synthesizes the image signal and the OSD signal generated by the OSD processor 240 and displays the result on the screen through the display unit 260 (step S 160).

Although the present invention has been described in detail with reference to exemplary embodiments above, those skilled in the art to which the present invention pertains can make various modifications to the above-described embodiments without departing from the scope of the present invention. I will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

As described above, according to the present invention, music-related data for a broadcast program is inserted and transmitted to an AC-3 audio descriptor in a transport stream, and music-related data is received in an AC-3 audio descriptor of a received transport stream. By extracting the data and displaying it on the screen, a user who owns a previously sold digital broadcast receiver can receive music-related information about the broadcast program without additional equipment.

Claims (14)

An MPEG-2 encoder that receives an image signal and encodes the image using an MPEG-2 compression algorithm; An AC-3 encoder that receives a voice signal and encodes the same using an AC-3 compression algorithm; A transmission multiplexer for receiving multiplexed image data encoded by the MPEG-2 encoder, audio data encoded by the AC-3 encoder, additional service data, and music-related data and outputting a multiplexed transport stream; And And a broadcast transmitter for modulating the transport stream output from the transport multiplexer and transmitting the modulated transport stream to the outside. And the transmission multiplexer multiplexes the music-related data by inserting it into an AC-3 audio descriptor. The method of claim 1, And the transmission multiplexer inserts the music-related data into at least one of a text [i] field or an additional_info [i] field of an AC-3 Audio Descriptor and multiplexes the multiplexer. A broadcast receiver configured to receive a transport stream transmitted by a digital broadcast transmitter; A demultiplexer for separating the transport stream received by the broadcast receiver into a video stream, an audio stream, and a data stream; A memory for storing the data stream separated by the demultiplexer; A music information extraction unit for extracting music-related data from an AC-3 Audio Descriptor of the data stream stored in the memory; An on-screen display (OSD) processor for generating an on-screen display (OSD) signal according to the music-related data extracted by the music information extractor; An image processor which decodes the video stream separated by the demultiplexer and synthesizes the decoded image signal and an OSD signal generated by the OSD processor; And And a display unit for displaying the image signal and the OSD signal output by the image processor on the screen. The method of claim 3, The music information extraction unit, After extracting the AC-3 Audio Descriptor from the data stream stored in the memory, the digital broadcast receiver characterized by extracting music-related data by checking the text [i] field and the additional_info [i] field of the extracted AC-3 Audio Descriptor . A digital broadcast transmitter for inserting and transmitting music-related data for a corresponding broadcast program into an AC-3 Audio Descriptor in a transport stream; And And a digital broadcast receiver for extracting music-related data from the AC-3 Audio Descriptor and displaying it on the screen after receiving the transport stream. The method of claim 5, The digital broadcast transmitter, An MPEG-2 encoder that receives an image signal and encodes the image using an MPEG-2 compression algorithm; An AC-3 encoder that receives a voice signal and encodes the same using an AC-3 compression algorithm; A transmission multiplexer for receiving multiplexed image data encoded by the MPEG-2 encoder, audio data encoded by the AC-3 encoder, additional service data, and music-related data and outputting a multiplexed transport stream; And It comprises a broadcast transmitter for modulating the transport stream output from the transport multiplexer to transmit to the outside, And the transmission multiplexer multiplexes the music-related data by inserting it into an AC-3 audio descriptor. The method of claim 6, The transmission multiplexer multiplexes the music-related data by inserting the music-related data into at least one of a text [i] field or an additional_info [i] field of an AC-3 Audio Descriptor. The method of claim 5, The digital broadcast receiver, A broadcast receiver configured to receive a transport stream transmitted by the digital broadcast transmitter; A demultiplexer for separating the transport stream received by the broadcast receiver into a video stream, an audio stream, and a data stream; A memory for storing the data stream separated by the demultiplexer; A music information extraction unit for extracting music related data from a data stream stored in the memory; An on-screen display (OSD) processor for generating an on-screen display (OSD) signal according to the music-related data extracted by the music information extractor; An image processor which decodes the video stream separated by the demultiplexer and synthesizes the decoded image signal and an OSD signal generated by the OSD processor; And And a display unit for displaying an image signal and an OSD signal output by the image processor on a screen. The method of claim 8, The music information extraction unit, After extracting the AC-3 Audio Descriptor from the data stream stored in the memory, the digital broadcast service characterized by extracting music-related data by checking the text [i] field and the additional_info [i] field of the extracted AC-3 Audio Descriptor system. The method according to any one of claims 5 to 9, The music related data includes a music title (Title), an artist (Artist), a genre (Genre). Inserting and transmitting music-related data about the broadcast program into an AC-3 Audio Descriptor in a transport stream; And And after receiving the transport stream, extracting music-related data from the AC-3 Audio Descriptor and displaying it on the screen. The method of claim 11, Inserting and transmitting music-related data about the broadcast program to the AC-3 Audio Descriptor in the transport stream, Outputting a transport stream after multiplexing and inserting music-related data for the broadcast program into an AC-3 audio descriptor; And Modulating the transport stream and transmitting it to the outside; And music-related data is inserted into at least one of a text [i] field or an additional_info [i] field of an AC-3 Audio Descriptor and multiplexed. The method according to claim 11 or 12, wherein After receiving the transport stream, extracting the music-related data from the AC-3 Audio Descriptor to display on the screen, After receiving the transport stream, dividing the received transport stream into a video stream, an audio stream, and a data stream, and storing the separated data stream in a memory; Extracting music-related data from a data stream stored in the memory; Generating an On Screen Display (OSD) signal according to the extracted music-related data; And And synthesizing the separated video stream with the decoded video signal and displaying the OSD signal on a screen. The method of claim 13, Extracting the music-related data, Extracting an AC-3 audio descriptor from a data stream stored in the memory; And And extracting music-related data from a text [i] field and an additional_info [i] field of the extracted AC-3 Audio Descriptor.

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