KR100789365B1 - Apparatus and Method for splicing of terrestrial DMB signal - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to an apparatus and method for splicing a terrestrial DMB signal.

2. The technical problem to be solved by the invention

The present invention provides an apparatus and method for splicing a terrestrial DMB signal that enables a broadcast service to be provided without interruption of a screen even when another program is inserted and transmitted while a specific program is being transmitted in a terrestrial DMB transmission system. The purpose is to provide

3. Summary of Solution to Invention

In the splicing device of a terrestrial DMB signal, the present invention analyzes first media data in the form of an MPEG transport stream to extract a corresponding parameter value including PID information, time information, and a continuous count value. First media data analysis and correction means for modifying the parameters of the first media data so that the parameters of the media data previously outputted after splicing are maintained in accordance with an MPEG system standard; Analyzing the second media data in the form of MPEG transport stream, extracting the corresponding parameter value including PID information, time information, and continuous count value, and consistency of parameters and MPEG system specifications of media data previously output even after splicing. Second media data analysis and modification means for modifying a parameter of the second media data such that it is maintained; And a stream multiplexing means for outputting any one selected from the first media data or the second media data, and then splicing and outputting the other media data at a splicing time point.

4. Important uses of the invention

The present invention is used for splicing terrestrial DMB signals.

Terrestrial DMB, DAB, Eureka-147, MPEG, Media Data, TS, Ensemble, Splicer

Description

Apparatus and Method for splicing of terrestrial DMB signal

1 is a configuration diagram of a general terrestrial DMB transmission system;

2 is a diagram illustrating an embodiment of an apparatus for splicing a terrestrial DMB signal according to the present invention.

* Explanation of symbols for the main parts of the drawings

201 and 211: ensemble data analyzer 202 and 212: external decoder

203, 213: Media data analysis and correction 205: Stream multiplexer

206: external encoder 207: ensemble data component

The present invention relates to a splicing device and a method for splicing a terrestrial DMB signal. More particularly, the present invention relates to a terrestrial DMB signal transmission system. The present invention relates to a splicing device for a terrestrial DMB signal and a method thereof, which provide a service.

The Eureka-147-based Digital Audio Broadcasting (DAB) transmission system has been developed to process and transmit only audio data or a small amount of data information because its primary purpose is to digitize analog audio broadcasting. In Korea, the terrestrial Digital Multimedia Broadcasting (DMB) standard and technology have been newly developed to provide video multimedia services in the Eureka-147 based DAB transmission system.

1 is a configuration diagram of a general terrestrial DMB transmission system and shows a multiplexing structure of a terrestrial DMB signal.

Terrestrial DMB encodes video signals to MPEG-4 by audio / video (A / V), and then SL (Sync Layer) packets to MPEG-4 system standard, multiplexes them to MPEG-2 system standard, and then externally After encoding (lead-solomon coding and convolutional interleaver), it is made into an Eureka-147 based DAB ensemble signal and transmitted.

When receiving and transmitting a digital broadcast signal from an arbitrary broadcast source device, if the transmission is replaced (spliced) with a digital broadcast signal generated by another broadcast source device, there is a problem that the screen may be cut off unlike an analog broadcast. .

Meanwhile, in order to prevent the above problem, there is a conventional method of decoding digital broadcast signals output from different devices, replacing them in the decoded analog broadcast signal state, and then encoding and transmitting them again. However, in order to decode and re-encode the digital broadcast signal, an expensive encoding apparatus is required, and there is a problem that image quality deterioration occurs due to decoding and encoding.

The present invention has been proposed to solve the above-mentioned problem, and the terrestrial DMB transmission system can provide a terrestrial broadcast service without interruption of a screen even when another program is inserted and transmitted while transmitting a specific program. It is an object of the present invention to provide a splicing apparatus for a DMB signal and a method thereof.

That is, according to the present invention, a terrestrial DMB transmission system inserts and transmits an advertisement program while transmitting a broadcast program, transmits a broadcast program again while transmitting an advertisement program, or re-transmits a central broadcast program. The present invention provides a splicing device and a method for splicing a terrestrial DMB signal, which enables the service without interruption of the screen even when the program is inserted and transmitted or when the program of the local broadcast is retransmitted while the program of the local broadcast is transmitted again. There is this.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above object, the present invention provides a splicing apparatus for terrestrial DMB (DMB) signals, comprising analyzing the first media data in the form of MPEG transport stream and including PID information, time information, and a continuous count value. First media data analysis and correction means for extracting a parameter value and modifying a parameter of said first media data such that the parameter of said first media data is maintained consistent with the parameters of the MPEG system standard previously output even after splicing; Analyzing the second media data in the form of MPEG transport stream, extracting the corresponding parameter value including PID information, time information, and continuous count value, and consistency of parameters and MPEG system specifications of media data previously output even after splicing. Second media data analysis and modification means for modifying a parameter of the second media data such that it is maintained; And a stream multiplexing means for outputting any one selected from the first media data or the second media data, and then splicing and outputting the other media data at a splicing time point.

In addition, the present invention includes a first ensemble data analysis means for analyzing the first ensemble data, to separate the media data of the sub-channel to output to the first media data analysis and correction means; Second ensemble data analysis means for analyzing second ensemble data, separating media data of a subchannel to be used for splicing, and outputting the media data to the second media data analysis and correction means; First outer decoding means for outer decoding the media data of the subchannel to be used for splicing in the frame of the first ensemble data; Second outer decoding means for outer decoding the media data of the subchannel to be used for splicing in the frame of the second ensemble data; External encoding means for externally encoding the media data outputted from the stream multiplexing means; Ensemble data construction means for reconstructing the ensemble data according to the DMB broadcasting standard by using an ensemble data analysis result in the first ensemble data analysis means or the second ensemble data analysis means; And storage means for storing data necessary for constructing the ensemble data.
On the other hand, the present invention, in the splicing method of terrestrial DMB (DMB) signal, the first media data in the form of MPEG transmission stream that is currently being broadcast by analyzing the first information including PID information, time information, continuous count value Extracting a parameter value; A second parameter extraction step of extracting a corresponding second parameter value including PID information, time information, and a continuous count value by analyzing second media data in the form of an MPEG transport stream to be newly inserted through splicing; A parameter correcting step of modifying a parameter value of the second media data based on the extracted first and second parameter values so that consistency after the splicing is maintained in accordance with an MPEG system standard; And a stream multiplexing step of transmitting the stream of the first media data and replacing the stream with the second media data whose parameter value is modified at the splicing time point.
In addition, the method of the present invention, when the ensemble data is input, the ensemble data analysis step of separating the media data of the sub-channel by analyzing the ensemble data before performing the first and second parameter extraction step; An outer decoding step of outer decoding the media data of the subchannel separated in the ensemble data analysis step; And an external encoding step of externally encoding the media data output in the stream multiplexing step. And an ensemble data construction step of reconstructing the ensemble data according to the DMB broadcasting standard by using the ensemble data analysis result in the ensemble data analysis step.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, 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 gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention can splice a DMB signal in an ensemble or MPEG-2 Transport Stream (TS) layer in a digital signal state in a terrestrial digital multimedia broadcasting (DMB) transmission system using an Eureka-147 digital audio broadcasting (DAB) transmission system. It is to be.

2 is a diagram illustrating an embodiment of an apparatus for splicing a terrestrial DMB signal according to the present invention. The splicing method performed in the splicing apparatus of the terrestrial DMB signal according to the present invention is a method corresponding to the splicing apparatus of FIG. 2 and will not be described through a separate drawing (flow diagram).

The present invention includes an ensemble data analysis unit (201, 211) for receiving the ensemble data received; Outer decoders 202 and 212 for outer decoding the media data of the subchannel to be used for splicing in the input ensemble data frame; Media data analysis and correction unit 203 and 213 for analyzing the decoded media data in MPEG-2 TS form and modifying the data to conform to MPEG-2 and MPEG-4 system standards even after splicing; Buffers 204 and 214 for storing or reading media data; A stream multiplexing unit 205 for selecting and outputting one stream from a stream being transmitted or a stream to be newly transmitted; An external encoder 206 for externally encoding the spliced media data; An ensemble data construction unit 207 for constructing and outputting ensemble data according to the Eureka-147 standard; It is composed of a buffer 208 for temporarily storing the data necessary to configure the ensemble data.

Media data in the form of an MPEG-2 transport stream (TS) or an ensemble signal of the Eureka-147 standard may be used as an input signal. According to the present invention, in the course of broadcasting the input signal A (media data A or ensemble data A), by switching (splicing) the input signal B (media data B or ensemble data B) or broadcasting the input signal B You can splice with the input signal A on the way.

First, the ensemble data analyzer 201 and 211 inputs ensemble data, analyzes the ensemble data frame, separates media data of subchannels to be used for splicing, and outputs the media data to the external decoders 202 and 212. .

The outer decoders 202 and 212 perform outer decoding (convolutional deinterleaver, Reed Solomon decoding), and then output the decoded media data to the media data analysis and correction unit 203 and 213.

Media data analysis and correction unit 203, 213 receives media data from external or external decoders 202, 212, analyzes it, extracts information necessary for splicing, and immediately after splicing MPEG-2. And media data to conform to the MPEG-4 system standard. That is, the stream data is managed so that the stream data is not cut off in the middle of the payload unit at the splicing boundary, and the program identification information for each stream and elementary stream (ES) previously sent immediately after splicing ( Modify PID (Program Identifier), time information (PCR, OCR, DTS, CTS), continuity counter (continuity_counter) to be consistent.

In more detail, it is as follows.

PAT (Program Association Table) and PMT (Program Map Table) are analyzed in the TS packets to find PSI (Program Specific Information) such as PID configuration information of each ES (BIFS, OD, video, audio, etc.). If the PSI of the newly input stream is different from that of the stream currently being transmitted, it is corrected (that is, modified to match the PSI of the stream currently being broadcast). TS packets having the same PID (PAT, PMT, BIFS, OD, video, audio, etc.) are managed for each payload unit so as not to be cut off in the middle of the payload unit. That is, the TS packet with payload_unit_start_indicator equal to "1" should be modified in the buffer while being read or modified in the buffer.

In addition, even after splicing, the stream and the continuous count value must be modified to be consistent with the previous stream. That is, the continuity_counter value in the TS packet having the same PID should be modified to be repeatedly increased from 0 to 15.

If the adaptation field (adaptation_field) is analyzed and there is a valid PCR (Program Clock Reference), it should be modified to be consistent. In addition, when there is splicing time information, splicing is performed using a splice countdown value. The splice countdown (splice_countdown) value means the number of TS packets remaining until splicing from TS packets with the same PID. Immediately after the TS packet with a splice countdown value of 0, the splice countdown value has the same PID. It must be spliced by TS packet.

Immediately after splicing, parameter values such as OCR, DTS, CTS, etc. of the stream and SL packet header previously sent are modified to be consistent.

The splicing time may use splicing time information in the adaptation field (adaptation_field) or a predetermined method between broadcasters or equipment. When the time point for splicing is determined, stream data should not be cut off in the middle of the payload unit at the boundary portion near the time point for splicing, and the buffer 204 should be managed so as not to overflow.

On the other hand, the stream multiplexing unit 205 replaces and outputs a new stream input from another direction in consideration of the above-mentioned conditions. If a stream of media data A or ensemble data A is used, the stream stored in the buffer 204 is modified to meet the MPEG-2 and MPEG-4 system standards through media data analysis and correction unit 203. In the middle of outputting using the converted media data as input data, to use the newly replaced stream, the stream stored in the buffer 214 is subjected to the media data analysis and correction unit 213 to meet the MPEG-2 and MPEG-4 system standards. The media data modified to be used is output as input data. The video stream immediately after splicing should be transmitted from the I picture.

Therefore, the stream must be stored in the buffer 214 from the I picture until the stream is used for broadcasting, and when the new I picture starts to be stored in the buffer 214, all previous video streams must be discarded. When storing data in the buffer 204, the null packet is removed and stored. When the amount of data stored in the buffer 204 is insufficient, a null packet is generated and output to the external or external encoder 206.

The external encoder 206 receives the spliced media data from the stream multiplexer 205, externalizes it and outputs the spliced media data to the ensemble data configuration unit 207.

The ensemble data configuration unit 207 receives the spliced media data from the external encoder 206, and then configures and outputs the ensemble itself to meet the standard of the Eureka-147. Alternatively, the ensemble data configuration unit 207 receives data from other subchannels, high-speed information channel (FIC) information, etc., except for spliced media data from the ensemble data analysis units 201 and 211, and receives the data from the external encoder 206. The ensemble can be configured and output like the input media data.

On the other hand, the ensemble data constructing unit 207 uses a buffer 208 for storing FIC information, subchannel data, etc. in order to construct an ensemble frame. The ensemble data configuration unit 207 configures the ensemble frame to conform to the standard of the Eureka-147 and outputs it to the outside while managing the buffer 208 not to overflow.

When the amount of data stored in the buffer 208 is small, the stream multiplexer 205 reads the data stored in the buffer 204 or 214 or generates a null packet to output media data to the external encoder 206.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention as described above, the terrestrial DMB system retransmitting the present broadcast has an effect that can be broadcast without interruption even when inserting the local broadcast or advertisement.

In addition, the present invention eliminates the need for an expensive encoding apparatus since it is not necessary to encode and transmit the broadcast signal after replacing the broadcast signal in the state of an analog broadcast signal, and has an effect of avoiding deterioration in image quality caused by decoding and encoding. .

Claims (15)

In a splicing device of a terrestrial DMB signal, Analyzing the first media data in the form of MPEG transport stream, extracting the corresponding parameter value including PID information, time information, and continuous count value, and consistent with the parameters of MPEG data and MPEG system specifications that were previously output even after splicing. First media data analysis and modifying means for modifying a parameter of the first media data such that it is maintained; Analyzing the second media data in the form of MPEG transport stream, extracting the corresponding parameter value including PID information, time information, and continuous count value, and consistency of parameters and MPEG system specifications of media data previously output even after splicing. Second media data analysis and modification means for modifying a parameter of the second media data such that it is maintained; And Stream multiplexing means for outputting any one selected from the first media data or the second media data and then splicing the data into another media data at a splicing time point. Splicing device for terrestrial DMB signal comprising a. The method of claim 1, First ensemble data analysis means for analyzing first ensemble data, separating media data of a subchannel, and outputting the media data to the first media data analysis and correction means; Splicing device for terrestrial DMB signal further comprising. The method of claim 2, First outer decoding means for outer decoding the media data of the subchannel to be used for splicing in the frame of the first ensemble data; Splicing device for terrestrial DMB signal further comprising. The method of claim 2 or 3, Second ensemble data analysis means for analyzing second ensemble data, separating media data of a subchannel to be used for splicing, and outputting the media data to the second media data analysis and correction means; Splicing device for terrestrial DMB signal further comprising. The method of claim 4, wherein External encoding means for externally encoding the media data outputted from the stream multiplexing means; Ensemble data construction means for reconstructing the ensemble data according to the DMB broadcasting standard by using an ensemble data analysis result in the first ensemble data analysis means or the second ensemble data analysis means; And Storage means for storing data necessary for constructing the ensemble data Splicing device for terrestrial DMB signal further comprising. The method of claim 4, wherein Second outer decoding means for outer decoding the media data of the subchannel to be used for splicing in the frame of the second ensemble data; Splicing device for terrestrial DMB signal further comprising. The method of claim 6, External encoding means for externally encoding the media data outputted from the stream multiplexing means; Ensemble data construction means for reconstructing the ensemble data according to the DMB broadcasting standard by using an ensemble data analysis result in the first ensemble data analysis means or the second ensemble data analysis means; And Storage means for storing data necessary for constructing the ensemble data Splicing device for terrestrial DMB signal further comprising. The method of claim 4, wherein The first and second media data analysis and correction means, Extracting PID information by analyzing PAT and PMT of corresponding media data A splicing device for terrestrial DMB signals. The method of claim 8, The first and second media data analysis and correction means, The apparatus for splicing terrestrial DMB signals of packets of media data having the same PID is managed for each payload unit so as not to be cut off during the payload unit. The method of claim 4, wherein The first and second media data analysis and correction means, A splicing device for terrestrial DMB signals characterized by analyzing an adaptation field (adaptation_field) and extracting a PCR (Program Clock Reference) as time information. The method of claim 4, wherein The first and second media data analysis and correction means, A splicing device for terrestrial DMMB signals, characterized in that the splicing time is determined by using splicing time information in the media data or by using a predetermined method between broadcasters or equipment. The method of claim 4, wherein The first and second media data analysis and correction means, The media data is stored / managed in a separate buffer, but when storing the media data in the buffer, the null data is stored after the null packet is removed. Null) splicing device for terrestrial DMB signal, characterized in that for generating and using the packet. In a splicing method of a terrestrial DMB signal, A first parameter extraction step of analyzing first media data in the form of an MPEG transport stream currently being broadcast and extracting a corresponding first parameter value including PID information, time information, and a continuous count value; A second parameter extraction step of extracting a corresponding second parameter value including PID information, time information, and a continuous count value by analyzing second media data in the form of an MPEG transport stream to be newly inserted through splicing; A parameter correcting step of modifying a parameter value of the second media data based on the extracted first and second parameter values so that consistency after the splicing is maintained in accordance with an MPEG system standard; And The stream multiplexing step of transmitting the stream of the first media data and then replacing the stream with the second media data whose parameter value is modified at the splicing time. Splicing method of terrestrial DMB signal comprising a. The method of claim 13, An ensemble data analysis step of analyzing the ensemble data and separating media data of subchannels before performing the first and second parameter extraction steps when the ensemble data is input; And The outer decoding step of outer decoding the media data of the sub-channel separated in the ensemble data analysis step Splicing method of the terrestrial DMB signal further comprising. The method of claim 14, An external encoding step of externally encoding the media data output in the stream multiplexing step; And Ensemble data construction step of reconstructing ensemble data to meet the DMB broadcasting standard by using the ensemble data analysis result in the ensemble data analysis step. Splicing method of the terrestrial DMB signal further comprising.

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