KR100721539B1 - Digital Multimedia Broadcasting / Receiving Device for High Quality Video Service - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a digital multimedia broadcasting transmission / reception apparatus.

2. The technical problem to be solved by the invention

The present invention uses a hierarchical modulation function to add a high quality video service or an additional data service function in a digital multimedia broadcasting, while maintaining backward compatibility with a conventional digital multimedia system. Its purpose is to provide a multimedia broadcasting transmission / reception apparatus.

3. Summary of Solution to Invention

A digital multimedia broadcasting transmission apparatus for a high quality video service, comprising: source encoding means for source encoding an audio / video signal into a base layer stream and an enhancement layer stream, respectively; A base layer transmission processing means for receiving a base layer stream from the source encoding means and performing system encoding and multiplexing into a transport stream to output a base layer transport stream; Enhancement layer transmission processing means for receiving an enhancement layer stream from the source encoding means and encoding the system, multiplexing into a media stream and outputting an enhancement layer transport stream; And hierarchical digital broadcast transmission means for receiving a base layer transport stream and an enhancement layer transport stream from the base layer transmission processing means and the enhancement layer transmission processing means, respectively, and modulating them into digital broadcast signals.

4. Important uses of the invention

The present invention is used for digital multimedia broadcasting (DMB) system.

Digital Multimedia Broadcasting (DMB), Video Services

Description

Apparatus for Transmitting and Receiving Digital Multimedia Broadcasting for Providing High Quality Video Service}

1 is a configuration diagram of an embodiment of a conventional digital multimedia broadcasting (DMB) transmitting apparatus;

2 is a block diagram of an embodiment of a digital audio broadcasting (DAB) transmitter of FIG. 1;

3 is a block diagram of an embodiment of a DMB transmission apparatus for a high quality video service according to the present invention;

4 is a detailed block diagram of an embodiment of an enhancement layer transmission processor of FIG. 3;

5 is a detailed block diagram of an embodiment of an enhancement layer transmission processor of FIG. 3;

6 is a detailed configuration diagram of an embodiment of a hierarchical DAB transmitter of FIG. 3;

7 is a constellation diagram of π / 4 QPSK signal,

8 is an embodiment of hierarchical symbol mapping according to an embodiment of the present invention, in which additional information is 1 bit and a constellation diagram of a signal signal mapped with a 2-ASK modulation scheme;

9 is an embodiment of hierarchical symbol mapping according to the present invention, in which the additional information is 2 bits and a constellation diagram of a signal mapped with a QPSK modulation scheme;

10 is a block diagram of an embodiment of a DMB transmission apparatus for an additional data service according to the present invention;

11 is a configuration diagram of an embodiment of a DMB receiving apparatus for a high quality video service according to the present invention;

12 is a detailed configuration diagram of an embodiment of the DAB receiving unit of FIG. 11;

13 is a flowchart illustrating an embodiment of a DMB reception process for a high quality video service according to the present invention;

14 is a block diagram of an embodiment of a DMB receiving apparatus for an additional data service according to the present invention.

Description of the main parts of the drawing

211: MPEG-4 scalable video encoder 220: enhancement layer transmission processing unit

213: MPEG-4 scalable audio encoder 230: base layer transmission processing unit

240: hierarchical DAB transmitter

The present invention relates to a digital multimedia broadcasting (DMB) transmitting / receiving apparatus for high quality video service. More particularly, the present invention relates to a high quality video service or an additional service while maintaining backward compatibility with a conventional digital multimedia broadcasting system. The present invention relates to a digital multimedia broadcasting transmission / reception apparatus for providing.

1 is a block diagram of an embodiment of a conventional digital multimedia broadcasting transmission apparatus.

As shown in FIG. 1, a conventional digital multimedia broadcasting transmission apparatus performs objectification and synchronization of an MPEG-4 video encoder 111 and an MPEG-4 audio encoder 113 and a media stream for source encoding of video and audio sources. MPEG-4 system encoder 120, MPEG-2 TS multiplexer 130 for multiplexing the media stream, RS (Reed-Solomon) encoder 140 used as an external encoder for additional error correction encoding, data stream In order to remove time correlation between adjacent byte units, a convolutional interleaver 150 used as an external interleaver and a stream output from the convolutional interleaver 150 are received through a stream mode channel to obtain a final digital broadcast signal. Digital Audio Broadcasting (DAB) 160 for converting the output to the output is configured.

Hereinafter, the DAB transmitter 160 will be described in more detail with reference to the Eureka-147 DAB transmitter which is a European digital audio broadcasting system.

FIG. 2 is a detailed configuration diagram of an exemplary embodiment of the DAB transmitter 160 of FIG. 1 and illustrates a configuration of the Eureka-147 DAB system, which is a European digital audio broadcasting system.

As shown in FIG. 1, the DAB transmitter 160 used in the conventional digital multimedia broadcasting transmission apparatus includes an energy dispersal scrambler 161, a convolutional encoder 162, and a time interleaver. An interleaver 163, a symbol mapper 164, a frequency interleaver 165, a differential modulator 166, an inverse fast Fourier transform unit 167, and It consists of Guard Interval Inserter.

The operation of the above-described configuration of the DAB transmitter 160 will be described below in the order of processing.

First, an MPEG (Motion Picture Experts Group) encoded audio data stream or a general data stream input to the DAB transmitter 160 is an energy dispersal scrambler 161 for energy distribution of a radio frequency (RF) transmission signal. After passing through, a convolutional encoder 162 is input to the convolutional encoder 162 and convolutional encoding is performed at different coding rates according to a UEP (Unequal Error Protection) or EEP (Equal Error Protection) profile.

Subsequently, each subchannel data time-interleaved in the time interleaver 163 for each of 16 logical frames (where each logical frame includes information of 24 ms intervals in the time domain and thus has a total 384 ms interleaving depth) It is multiplexed in Main Service Multiplexor to form CIF (Common Interleaved Frame).

Subsequently, the symbol mapper 164 configures a synchronization channel, a fast information channel (FIC), and a main service channel (MSC) for effective data transmission to form a digital audio broadcasting (DAB) transmission frame in units of 24 ms. Phase Shift Keying) After symbol mapping, frequency interleaving is applied in the frequency interleaver 165 to minimize the influence on frequency selective fading.

Subsequently, the differential modulator 166 generates a phase reference signal and locates it in the second symbol of the transmission frame. Based on this, the differential modulator 166 configures a fast information channel (FIC) and a main service channel (MSC). Frequency Division Multiplexing) Differential modulation is performed on a symbol.

Subsequently, each OFDM symbol constituting the transmission frame is subjected to zero-padding for inverse fast fourier transform (IFFT) processing of 2N, and then the inverse fast Fourier transform unit 167 is performed. Is transformed into a time-domain signal through an inverse fast Fourier transform (IFFT).

Subsequently, the guard interval inserting unit 168 inserts and transmits data corresponding to about one quarter of the effective symbol interval after the guard symbol interval to remove the inter-symbol interference (ISI) before the valid symbol.

In the conventional digital multimedia broadcasting method, when a convolutional coding method having a code rate of 1/2 rate is applied, the available transmission rate is 1.152 Mbps, and if two video services are applied in one channel, 576 kbps per service is applied. Is assigned.

Therefore, the conventional digital multimedia broadcasting transmission apparatus has a problem in providing a high quality service even when high efficiency source encoding is applied (776 kbps).

The present invention has been proposed to solve the above problems, and by using a hierarchical modulation function, it is possible to add high quality video service or additional data service function in digital multimedia broadcasting and maintain backward compatibility with the conventional digital multimedia system. An object of the present invention is to provide a digital multimedia broadcasting transmission / reception apparatus for a high quality video service or an additional data service.

In addition, the present invention can be assigned to each layer divided into a base layer and an enhancement layer by applying scalable coding as a source coding method, and the receiving side of the base layer and the enhancement layer It is an object of the present invention to provide a digital multimedia broadcasting transmission / reception apparatus for a high quality video service capable of receiving all streams and applying a high quality video service by applying scalable decoding technology.

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.

According to an aspect of the present invention, there is provided a digital multimedia broadcasting transmission apparatus for a high quality video service, comprising: source encoding means for source encoding an audio / video signal into a base layer stream and an enhancement layer stream, respectively; A base layer transmission processing means for receiving a base layer stream from the source encoding means and performing system encoding and multiplexing into a transport stream to output a base layer transport stream; Enhancement layer transmission processing means for receiving an enhancement layer stream from the source encoding means and encoding the system, multiplexing into a media stream and outputting an enhancement layer transport stream; And hierarchical digital broadcast transmission means for receiving a base layer transport stream and an enhancement layer transport stream from the base layer transmission processing means and the enhancement layer transmission processing means, respectively, and modulating them into digital broadcast signals.

The present invention also provides an apparatus for transmitting digital multimedia broadcasting for an additional data service, comprising: additional data source encoding means for source encoding an additional data to output an enhancement layer stream; Base layer source encoding means for source encoding an A / V signal to output a base layer stream; Base layer transmission processing means for receiving the base layer stream, system encoding and multiplexing into a transport stream to output a base layer transport stream; Enhancement layer transmission processing means for receiving the enhancement layer stream, system encoding and multiplexing into a media stream to output an enhancement layer transport stream; And hierarchical digital broadcast transmission means for receiving a base layer transport stream and an enhancement layer transport stream from the base layer transmission processing means and the enhancement layer transmission processing means, respectively, and modulating them into digital broadcast signals.

In addition, the present invention is a digital multimedia broadcasting receiving apparatus for a high quality video service, receives a digital broadcast signal, separates the base layer stream and the enhancement layer stream, outputs the enhancement layer stream and demodulates the base layer stream by symbol demapping. Digital broadcast receiver for outputting; A base layer reception processor for receiving the demodulated base layer streams, channel decoding, transport stream demultiplexing, and system decoding to output base layer audio and video streams; An enhancement layer reception processor configured to receive the enhancement layer stream by demodulation through symbol demapping, channel decoding, transport stream demultiplexing, and system decoding to output enhancement layer audio and video streams; And a scalable A / V decoder configured to receive the base layer audio and video streams and the enhancement layer audio and video streams, and to perform a scalable decoding operation.

In addition, the present invention is a digital multimedia broadcasting receiving apparatus for an additional data service, receives a digital broadcast signal, separates a base layer stream and an enhancement layer stream, outputs an enhancement layer stream, and demodulates the base layer stream by symbol demapping. Digital broadcast receiver for outputting; A base layer reception processor for receiving the demodulated base layer streams, channel decoding, transport stream demultiplexing, and system decoding to output base layer audio and video streams; An enhancement layer reception processor configured to receive the enhancement layer stream, demodulate it through symbol demapping, channel decode, and output additional data; An A / V decoder for receiving and decoding the base layer audio and video streams; And an additional data decoder for receiving, decoding, and outputting the additional data.

The following merely illustrates the principles of the invention. Therefore, those skilled in the art, although not explicitly described or illustrated herein, can embody the principles of the present invention and invent various devices that fall within the spirit and scope of the present invention. Furthermore, all conditional terms and embodiments listed herein are in principle clearly intended for the purpose of understanding the concept of the invention and are not to be limited to the specifically listed embodiments and states. Should be.

In addition, it is to be understood that all detailed descriptions, including the principles, aspects, and embodiments of the present invention, as well as listing specific embodiments, are intended to include structural and functional equivalents of these matters. In addition, these equivalents should be understood to include not only equivalents now known, but also equivalents to be developed in the future, that is, all devices invented to perform the same function regardless of structure.

Thus, for example, the block diagrams herein should be understood to represent a conceptual view of example circuitry embodying the principles of the invention. Similarly, all flowcharts, state transitions, pseudocodes, and the like are understood to represent various processes performed by a computer or processor, whether or not the computer or processor is substantially illustrated on a computer readable medium and whether the computer or processor is clearly shown. Should be.

The functionality of the various elements shown in the figures, including functional blocks represented by a processor or similar concept, can be provided by the use of dedicated hardware as well as hardware capable of executing software in association with appropriate software. When provided by a processor, the functionality may be provided by a single dedicated processor, by a single shared processor or by a plurality of individual processors, some of which may be shared.

In addition, the explicit use of terms presented in terms of processor, control, or similar concept should not be interpreted exclusively as a citation of hardware capable of executing software, and without limitation, digital signal processor (DSP) hardware, software for storing It should be understood that it implicitly includes ROM, RAM, and non-volatile memory. Other well known hardware may also be included.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same components as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter 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.

3 is a block diagram of an embodiment of a digital multimedia broadcasting transmission device for a high quality video service according to the present invention.

As shown in FIG. 3, the apparatus for transmitting digital multimedia broadcasting for high quality video service includes an MPEG-4 scalable video encoder 211, an MPEG-4 scalable audio encoder 213, and an enhancement layer transmission processor 220. And a base layer transmission processor 230 and a hierarchical DAB transmitter 240.

The MPEG-4 scalable video encoder 211 generates a base layer video stream compatible with a conventional digital multimedia broadcasting system and an enhancement layer video stream for improved quality. And output to the base layer transmission processing unit 230 and the enhancement layer transmission processing unit 220, respectively.

The MPEG-4 scalable audio encoder 213 generates an audio source as a base layer audio stream compatible with a conventional digital multimedia broadcasting system and an enhancement layer audio stream for improved quality. And output to the base layer transmission processing unit 230 and the enhancement layer transmission processing unit 220, respectively.

The enhancement layer video stream and enhancement layer audio stream may be generated using various scalable techniques such as temporal, spatial, and noise ratio (SNR) scalability, which are well known to those skilled in the art. Detailed description will be omitted. The contents described in the conventional digital multimedia broadcasting standard document (ETSI EN 300 401) in relation to the embodiment of the present invention may be referred to as the background art of the present invention. Hereinafter, in the following description of the embodiments of the present invention, the details described above in the standard document will be omitted as much as possible, and will be described in detail with respect to the newly proposed and added parts of the present invention.

As shown in FIG. 4, the base layer transmission processor 230 includes an MPEG-4 system encoder 120, an MPEG-2 TS multiplexer 130, an RS encoder 140, and a convolutional interleaver 150. The function of the configuration is as described above with reference to FIG.

That is, the base layer transmission processor 230 is for processing a base layer video stream and an audio stream supporting the conventional digital multimedia broadcasting, and the MPEG-4 scalable video encoder 211 and the MPEG-4 audio scale. Base layer video streams and audio streams input from the flexible audio encoder 213 are respectively objectified by the MPEG-4 system encoder 120 and synchronized between all streams, and then the base layer transport stream is performed by the MPEG-2 TS multiplexer 130. Multiplexing, error correcting encoding in the RS encoder 140, and the convolutional interleaver 150 removes the visual correlation between adjacent byte units in the stream and outputs the correlation to the hierarchical DAB transmitter 240.

The enhancement layer transmission processor 220 is a configuration for processing the enhancement layer video stream and the enhancement layer audio stream in order to provide an image having a higher quality than the base layer, and will be described below in detail with reference to FIG. 5.

The hierarchical DAB transmitter uses the basic structure of the above-described conventional DAB transmitter as it is, but has a configuration in which the hierarchical symbol mapper proposed in the present invention is added to process both the base layer stream and the enhancement layer stream. The hierarchical DAB transmitter will be described later in detail with reference to FIG. 6.

5 is a detailed block diagram of an embodiment of an enhancement layer transmission processing unit according to the present invention.

As shown in FIG. 5, the enhancement layer transmission processor 220 includes an MPEG-4 system encoder 221, an MPEG-2 TS multiplexer 222, an energy spreading scrambler 223, a channel encoder 224, and a time interleaver. And 225.

The MPEG-4 system encoder 221 objectizes and inputs the received enhancement layer video stream and enhancement layer audio stream and outputs the same to the MPEG-2 TS multiplexer 222.

The MPEG-2 TS multiplexer 222 multiplexes an enhancement layer video stream and an enhancement layer audio stream received from the MPEG-4 system encoder 221 into an enhancement layer transport stream.

The energy spreading scrambler 223 receives the enhancement layer transport stream and performs energy distribution of the transmission signal. Here, the energy dispersion may use the dispersion polynomial of the standard document (ETSI EN 300 401).

The channel encoder 224 receives the energy-distributed enhancement layer transport stream and performs channel encoding on the wireless transmission channel to have a robust error correction function. Here, the channel coding scheme having the error correction function may include a RS code, a convolutional code, a Low Density Parity Check (LDPC) code, a Turbo coding scheme, or a concatenated code that connects them together. In this case, RCPC (Rate Compatible Punctured Code) that can change the channel coding rate is used or a structure that can change the coding rate of the channel code itself is used.

The time interleaver 225 is a component for error distribution for fading of a wireless transmission channel. In this embodiment, the time interleaver outputs a bit stream by time interleaving using the time interleaver method defined in the standard document. The bit stream output of the time interleaver 225 is input to the hierarchical symbol mapper 241 of the hierarchical DAB transmitter 240 described later.

6 is a detailed block diagram of an embodiment of the hierarchical DAB transmitter of FIG. 3.

As shown in FIG. 6, the hierarchical DAB transmitter 240 of the present invention is configured to add a hierarchical symbol mapper 241 to the conventional DAB transmitter described above with reference to FIG. 2.

That is, the hierarchical DAB transmitter 240 may include an energy spreading scrambler 161, a convolutional encoder 162, a time interleaver 163, a symbol mapper 164, a frequency interleaver 165, a differential modulator 166, and an inverse high speed. A hierarchical symbol mapper 241 is inserted between the differential modulator 166 and the inverse fast Fourier transform 167 in a conventional DAB transmitter including a Fourier transform 167 and a guard interval inserter 168. Configuration. Hereinafter, the hierarchical symbol mapper newly proposed in the present invention among the hierarchical DAB transmitters 240 will be described in detail, and a description of the remaining elements of the conventional configuration will be omitted.

The hierarchical symbol mapper 241 symbol-maps the encoded enhancement layer transport stream received from the enhancement layer transmission processor 220 according to the modulation signal of the base layer transport stream output from the differential modulation unit 166 and performs an inverse fast Fourier transform unit. Output to (167).

Hereinafter, the hierarchical symbol mapping process according to the present invention will be described in detail.

The base layer transport stream is allocated two bits by applying QPSK (Qualary Phase Shift Keying) in the symbol mapper 164, and the position on the quadrant according to the two-bit value is determined in the differential modulator 166. Quadrant means real and imaginary axis rotated by π / 4.

Enhancement layer transport stream applies one of the following schemes, such as Amplitude Shift Keying (ASK), Quaternary Phase Shift Keying (QPSK), and Quadrature Amplitude Modulation (QAMK), and a similar modulation scheme in the layer symbol mapper 241. In addition to 2 bits of the base layer, an additional bit rate can be secured by allocating 1 bit for 2-ASK, 2 bits for QPSK, and 4 bits for 16-QAM. A symbol of the enhancement layer is mapped by applying a constellation according to the modulation scheme of the enhancement layer to the position of the quadrant determined in the base layer.

A more detailed embodiment of the layer symbol mapping method according to the present invention is as follows.

If the k th QPSK symbol of the frequency interleaved l th OFDM symbol of the base layer transport stream is defined as y _{l , k} , the output z ^b _{l, k} of the differential modulator 166 of the base layer transport stream is represented by Equation 1 below. It can be defined as

z ^b _{l , k} = z ^b _{l -1, k} Y _{l , k} ( l = 2, 3, 4,…, L and- K / 2 ≤ k ≤ K / 2)

Here, L is the number of OFDM symbols, K is the number of multi-carriers and z ^b _{l , k} are generated by a phase reference symbol generator (not shown).

또는

중 한 값이 된다. 여기서, 변조된 심볼의 크기는 1로 가정했다. 도 7에 π/4 QPSK 신호의 성상도를 도시하였다.Equation 1 means that each carrier is modulated by π / 4 QPSK modulation. Therefore, z ^b _{l , k} is

or

Will be one of the values. Here, the size of the modulated symbol is assumed to be 1. Fig. 7 shows the constellation of the π / 4 QPSK signal.

If the symbol for the k- th carrier of the l- th OFDM symbol of the enhancement layer transport stream is defined as z ^e _{l, k} , the output z _{l , k} of the layer symbol mapper 241 can be defined as Equation 2 below. .

z _{l , k =} ζ (z ^b _{l , k} , z ^e _{l , k} )

Here, ζ () represents a layer symbol mapping function and is determined according to the number of bits of additional information of the enhancement layer and a modulation scheme.

As an example of the hierarchical symbol mapper 241, when the additional information of the enhancement layer is 1 bit and uses the 2-ASK modulation scheme, the hierarchical symbol mapper may be designed using Equation 3 below.

Where a is a constant greater than zero.

FIG. 8 is an embodiment of hierarchical symbol mapping according to the present invention, in which additional information is 1 bit and is a constellation diagram of a signal signal mapped with a 2-ASK modulation scheme. In FIG. 4, the constellations represented by the black dots are constellations for the symbol-mapped signals of the base layer, and the constellations represented by the white dots are constellations for the symbol-mapped signals of the enhancement layer.

As another example of hierarchical symbol mapping, when the additional information of the enhancement layer is 2 bits and QPSK modulation, the hierarchical symbol mapping function is shown in Table 1 below, and the constellation of the signal signal mapped according to the symbol is shown in FIG. 9. .

Here, A is an information bit corresponding to z ^e _{l , k} , B is an information bit corresponding to z ^b _{l , k} and a is a constant greater than zero.

Even if the additional information of the enhancement layer is 3 bits or more, the layer symbol mapping constellation according to the information of the base layer and the enhancement layer may be extended in a similar manner.

In principle, the structure of the DMB frame to which the reinforcement layer can be applied is applied only to the MSC, which is a channel that actually transmits data, but if necessary, the reinforcement layer is applied to both the FIC and the MSC that provide system information. In addition, information on the layered layer, for example, whether or not to use the layered layer, the modulation scheme applied when using the layered information, the coding rate of the channel encoder, and the service layer-related service information is transmitted through the FIC, and the information on the layered layer is transmitted. Receive from the DMB receiving device.

10 is a configuration diagram of an apparatus for transmitting digital multimedia broadcasting for an additional data service according to the present invention.

The base layer and the reinforcement layer may use the reinforcement layer as an additional transport channel for additional services, in addition to providing the above-described high quality service. That is, by using an additional source encoder in the enhancement layer, it is possible to provide additional video service. This additional video service may be a service associated with a base layer such as stereo video, multiview video, or may be an independent separate service.

As shown in FIG. 10, the apparatus for transmitting digital multimedia broadcasting for an additional data service according to the present invention includes an additional data source encoder 115 and an additional data source encoder 115 for encoding and outputting data for an additional service. Enhancement layer transmission processing unit 220 for processing the additional data outputted from the above as the enhancement layer signal, MPEG-4 video encoder 111 for encoding and outputting the A / V signal of the base layer, MPEG-4 audio A base layer transmission processor 230 and a hierarchical DAB transmitter 240 for receiving and processing a base layer signal output from the encoder 113, the MPEG-4 video encoder 111, and the MPEG-4 audio encoder 113. ). The MPEG-4 video encoder 111, the MPEG-4 audio encoder 113, the MPEG-4 video encoder 111, the MPEG-4 audio encoder 113, the enhancement layer transmission processor 220, the base layer transmission processor The function of the 230 and the hierarchical DAB transmitter 240 is as described above.

According to the present embodiment, by transmitting the data packet for various additional data services to the enhancement layer, the present embodiment can support additional data services linked to or independently added to various services supported by the conventional digital multimedia broadcasting.

FIG. 11 is a block diagram of an embodiment of a digital multimedia broadcasting receiver for a high quality video service according to the present invention. FIG. 12 is a block diagram of an embodiment of the DAB receiver of FIG.

As shown in FIG. 11, the apparatus for receiving a digital multimedia broadcasting for high quality video service according to the present invention includes a DAB receiver 310, a base layer reception processor 320, an enhancement layer reception processor 330, and an MPEG-4 scalable. Video decoder 340 and MPEG-4 scalable audio decoder 350.

The base layer reception processing unit 320 is the same component as a conventional digital multimedia broadcasting receiver, and includes a convolutional decoder 321, an RS decoder 322, a TS demultiplexer 323, and an MPEG-4 system decoder 324. In addition, the enhancement layer reception processing unit 330 includes a layer symbol demapper 331, a time deinterleaver 332, a channel decoder 333, an energy-reliable descrambler 334, a TS demultiplexer 335, and an MPEG-4. The system decoder 336 decodes the base layer signal and the enhancement layer signal through an inverse process corresponding to the encoding process in the above-described digital multimedia broadcasting transmitter for high quality video service.

As shown in FIG. 12, the DAB receiver 310 is an Eureka 147 DAB receiver, which includes an RF tuner 311, an A / D converter 312, a fast Fourier transform unit 313, and a differential demodulator 314. And a frequency deinterleaver 315, a symbol demapper 316, a time deinterleaver 317, a convolutional decoder 318 and an energy spreading descrambler 319.

First, the DAB receiver 310 receives a broadcast signal and extracts information and data streams for various services through a reverse process corresponding to the above-described DAB transmitter. In particular, the frequency de-interleaver 315 of the DAB receiver 310 separates the base layer stream and the enhancement layer stream, and the base layer stream undergoes the same channel decoding process as in the existing digital multimedia broadcasting receiver. The enhancement layer stream is output to the enhancement layer reception processor 330, and the layer symbol demapper 331, the time de-interleaver 332, the channel decoder 333, and the energy distribution descrambler (Energy). The channel is decoded through a process of diverse de-scrambler (334).

Each of the two channel-decoded transport streams is separated into video, audio, and various additional information packets by the TS demultiplexers 323 and 335, and then depacketized by the MPEG-4 system decoders 324 and 336. After the packetization) and the synchronization between the streams, the video and audio streams of the two layers are extracted and output.

The MPEG-4 Scalable Video Decoder 340 and the MPEG-4 Scalable Audio Decoder 350 store video and audio streams of the base layer and the enhancement layer received from the MPEG-4 system decoders 324 and 336. A scalable decoding process is performed using correlations to provide users with high quality video and audio.

On the other hand, when the digital multimedia broadcasting receiving apparatus according to the present invention receives a broadcast signal transmitted from a conventional digital multimedia broadcasting system, only the stream of the base layer is extracted and subjected to the same decoding and processing as the conventional digital multimedia broadcasting receiving system. Provides basic quality video and audio.

13 is a flowchart illustrating a digital multimedia broadcasting reception process for a high quality video service according to the present invention.

First, when receiving a broadcast signal from the Eureka-147 DAB receiving apparatus (S110), it analyzes various multiplexing and service information transmitted through the FIC of the transmission frame (S120) and extracts information related to the broadcast channel, multiplexing and service The broadcast channel information is determined at step S130.

As a result of the determination, if the determined broadcast channel information indicates a high quality broadcast consisting of a base layer and an enhancement layer, the channel decoding process (S151) and the media decoding process based on MPEG-2 and MPEG-4 are divided into two streams, respectively. The high quality service is provided through the S152.

On the other hand, if the determined broadcast channel information indicates the existing broadcast, as in the conventional digital multimedia broadcasting receiver, only the streams of the base layer are extracted and subjected to the basic quality of service through the channel decoding process (S141) and the media decoding process (S142), respectively. Provided (S153).

14 is a block diagram of an embodiment of a DMB receiving apparatus for an additional data service according to the present invention.

As shown in FIG. 14, the DMB receiving apparatus for an additional data service according to the present invention includes a DAB receiving unit 310, a base layer receiving processing unit 320, an enhancement layer receiving processing unit 330, and an MPEG-4 video decoder 410. ), An MPEG-4 audio decoder 420, and an additional data decoder 430.

Since the DAB receiving unit 310, the base layer receiving processing unit 320, and the enhancement layer receiving processing unit 330 have the same configuration as described above with reference to FIGS. 11 and 12, a detailed description thereof will be omitted. However, the enhancement layer reception processor 330 receives the enhancement layer stream and finally outputs additional data, and the TS demultiplexer 335 and the MPEG-4 system decoder 336 may be omitted according to the type of the additional data. Do.

The MPEG-4 video decoder 410 and the MPEG-4 audio decoder 420 receive and decode the base layer audio and video streams output from the base layer reception processor.

The additional data decoder 330 receives the additional data from the enhancement layer reception processor 330 and decodes the output data according to the type of the additional data.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention has the effect of providing additional high quality video service and additional data service while ensuring compatibility with the conventional digital multimedia broadcasting network.

In addition, the present invention provides a hierarchical modulation function to the existing digital multimedia broadcasting transmission system, can provide a high quality video service by securing more effective transmission rate than the conventional DMB, and at the same time provide more broadcast service channels It can work.

Claims (31)

Digital multimedia broadcasting transmission device for high quality video service, Source encoding means for source encoding the audio / video signal into a base layer stream and an enhancement layer stream, respectively; A base layer transmission processing means for receiving a base layer stream from the source encoding means and performing system encoding and multiplexing into a transport stream to output a base layer transport stream; Enhancement layer transmission processing means for receiving an enhancement layer stream from the source encoding means and encoding the system, multiplexing into a media stream and outputting an enhancement layer transport stream; And Hierarchical digital broadcast transmission means for receiving a base layer transport stream and an enhancement layer transport stream from the base layer transmission processing means and the enhancement layer transmission processing means, respectively, and modulating them into a digital broadcast signal; Digital multimedia broadcasting transmission device for a high quality video service comprising a. The method of claim 1, The hierarchical digital broadcast transmission means, And modulating by mapping the enhancement layer transport stream according to the modulated base layer stream modulation signal after modulating the base layer transport stream. The method of claim 1, The source encoding means, A scalable video encoder using scalability technology to generate a video source into a base layer video stream compatible with a conventional digital multimedia broadcasting (DMB) system and an enhancement layer video stream for enhanced high quality video service; And Scalable Video Encoder to create audio sources into base layer audio streams compatible with conventional digital multimedia broadcasting (DMB) systems and enhancement layer audio streams for enhanced high quality services using scalability technology Digital multimedia broadcasting transmission device for a high quality video service comprising a. The method of claim 1, The base layer transmission processing means, A system encoder for objectizing and synchronizing the base layer stream; And A transport stream multiplexer for outputting a base layer transport stream by multiplexing output streams of the system encoder to an MPEG-2 TS; An external encoder for additional error correction encoding of a base layer transport stream output from the transport stream multiplexer; And External interleaver for removing time correlation between adjacent byte units in the stream output from the external encoder. Digital multimedia broadcasting transmission device for a high quality video service comprising a. The method of claim 4, wherein And the external encoder is a reed-solomon (RS) encoder. The method of claim 4, wherein The external interleaver is a convolutional interleaver (Convolutional Interleaver) characterized in that the digital multimedia broadcasting transmission apparatus for high quality video service. The method of claim 1, The enhancement layer transmission processing means, A system encoder for objectizing, synchronizing and outputting the enhancement layer stream; A transport stream multiplexer for multiplexing and outputting streams output from the system encoder into an enhancement layer transport stream; An energy diffusion scrambler for receiving the enhancement layer transport stream and performing energy distribution; A channel encoder for receiving the energy-distributed enhancement layer transport stream and channel encoding the wireless transmission channel to have a robust error correction function; And Time interleaver for outputting enhancement layer bit stream by performing time interleaving to distribute errors for fading of wireless transport channels Digital multimedia broadcasting transmission device for a high quality video service comprising a. The method of claim 7, wherein And the enhancement layer transport stream is MPEG-2 TS. The method of claim 7, wherein The channel encoder, Digital encoding for high-quality video services using any one of an RS code, a convolutional code, a Low Density Parity Check (LDPC) code, a Turbo code, or a concatenated code. Multimedia broadcast transmission device. The method of claim 1, The hierarchical digital broadcast transmission means, A symbol mapper for symbol mapping and modulating the base layer transport stream; A frequency interleaver for applying frequency interleaving to the symbol mapped signal; A differential modulator for differentially modulating the frequency interleaved symbol mapping signal signal; And A hierarchical symbol mapper for symbol modulation and phase modulation of the enhancement layer transport stream according to a base layer modulated signal received from the differential modulator Digital multimedia broadcasting transmitter for high quality video service, including. The method of claim 10, The symbol mapper is QPSK symbol mapping of the base layer transport stream, The differential modulator, A digital multimedia broadcasting transmission apparatus for a high quality video service, characterized by generating a phase reference signal and performing differential modulation on OFDM symbols constituting FIC and MSC. The method of claim 10, The hierarchical symbol mapper is And 2-ASK modulation of the enhancement layer transport stream according to the modulation signal of the symbol-mapped base layer transport stream. The method of claim 12, The hierarchical symbol mapper is Digital multimedia broadcasting transmission apparatus for a high quality video service, characterized in that the symbol mapping of the enhancement layer transport stream using Equation 1 below. [Equation 1]

(Where a is a constant greater than 0, z ^b _{l , k} modulated signal of the base layer transport stream, z ^e _{l, k} is Symbols for the k th carrier of the l th OFDM symbol of the enhancement layer transport stream, l = 2, 3, 4,... , L, -K / 2 ≤ k ≤ K / 2, L is the number of OFDM symbols, K is the number of multi-carrier) The method of claim 10, The hierarchical symbol mapper is And QPSK modulating an enhancement layer transport stream according to the modulation signal of the symbol-mapped base layer transport stream. The method of claim 10, The hierarchical symbol mapper is And 16-QAM modulation of the enhancement layer transport stream according to the modulation signal of the symbol-mapped base layer transport stream. A digital multimedia broadcasting transmitting device for additional data service, Additional data source encoding means for source encoding the additional data to output an enhancement layer stream; Base layer source encoding means for source encoding an A / V signal to output a base layer stream; Base layer transmission processing means for receiving the base layer stream, system encoding and multiplexing into a transport stream to output a base layer transport stream; Enhancement layer transmission processing means for receiving the enhancement layer stream, system encoding and multiplexing into a media stream to output an enhancement layer transport stream; And Hierarchical digital broadcast transmission means for receiving a base layer transport stream and an enhancement layer transport stream from the base layer transmission processing means and the enhancement layer transmission processing means, respectively, and modulating them into a digital broadcast signal; Digital multimedia broadcasting transmission apparatus for an additional data service comprising a. The method of claim 16, The hierarchical digital broadcast transmission means, And after modulating the base layer transport stream, symbol mapping the modulation of the enhancement layer transport stream according to the modulated base layer stream modulation signal. The method of claim 16, The base layer transmission processing means, A system encoder for objectizing and synchronizing the base layer stream; And A transport stream multiplexer for outputting a base layer transport stream by multiplexing output streams of the system encoder to an MPEG-2 TS; An external encoder for additional error correction encoding of a base layer transport stream output from the transport stream multiplexer; And External interleaver for removing time correlation between adjacent byte units in the stream output from the external encoder. Digital multimedia broadcasting transmission apparatus for an additional data service comprising a. The method of claim 16, The enhancement layer transmission processing means, A system encoder for objectizing, synchronizing and outputting the enhancement layer stream; A transport stream multiplexer for multiplexing and outputting streams output from the system encoder into an enhancement layer transport stream; An energy diffusion scrambler for receiving the enhancement layer transport stream and performing energy distribution; A channel encoder for receiving the energy-distributed enhancement layer transport stream and channel encoding the wireless transmission channel to have a robust error correction function; And Time interleaver for outputting enhancement layer bit stream by performing time interleaving to distribute errors for fading of wireless transport channels Digital multimedia broadcasting transmission apparatus for an additional data service comprising a. The method of claim 16, The hierarchical digital broadcast transmission means, A symbol mapper for symbol mapping and modulating the base layer transport stream; A frequency interleaver for applying frequency interleaving to the symbol mapped signal; A differential modulator for differentially modulating the frequency interleaved symbol mapping signal signal; And A hierarchical symbol mapper for symbol modulation and phase modulation of the enhancement layer transport stream according to a base layer modulated signal received from the differential modulator Digital multimedia broadcasting transmission apparatus for an additional data service comprising a. The method of claim 20, The symbol mapper is QPSK symbol mapping of the base layer transport stream, The differential modulator, A digital multimedia broadcasting transmission apparatus for an additional data service, characterized by generating a phase reference signal and performing differential modulation on OFDM symbols constituting FIC and MSC. The method of claim 20, The hierarchical symbol mapper is And 2-ASK modulation of the enhancement layer transport stream according to the modulation signal of the symbol-mapped base layer transport stream. The method of claim 22, The hierarchical symbol mapper is Digital multimedia broadcasting transmission apparatus for an additional data service, characterized in that the symbol mapping of the enhancement layer transport stream using Equation 1 below. [Equation 1]

(Where a is a constant greater than 0, z ^b _{l , k} modulated signal of the base layer transport stream, z ^e _{l, k} is Symbols for the k th carrier of the l th OFDM symbol of the enhancement layer transport stream, l = 2, 3, 4,... , L, -K / 2 ≤ k ≤ K / 2, L is the number of OFDM symbols, K is the number of multi-carrier) The method of claim 20, The hierarchical symbol mapper is And QPSK modulating the enhancement layer transport stream according to the modulation signal of the symbol-mapped base layer transport stream. The method of claim 20, The hierarchical symbol mapper is And 16-QAM modulation of the enhancement layer transport stream according to the modulation signal of the symbol-mapped base layer transport stream. Digital multimedia broadcasting receiver for high quality video service, A digital broadcast receiver for receiving a digital broadcast signal, separating a base layer stream and an enhancement layer stream, outputting an enhancement layer stream, and demodulating and outputting the base layer stream through symbol demapping; A base layer reception processor for receiving the demodulated base layer stream, channel decoding, transport stream demultiplexing, and system decoding to output a base layer audio and video stream; An enhancement layer reception processor configured to receive the enhancement layer stream by demodulation through symbol demapping, channel decoding, transport stream demultiplexing, and system decoding to output enhancement layer audio and video streams; And A scalable A / V decoder for receiving the base layer audio and video streams and the enhancement layer audio and video streams and outputting a scalable decode Digital multimedia broadcasting receiver for a high quality video service comprising a. The method of claim 26, The digital broadcast receiver, A digital multimedia broadcasting receiver for a high quality video service, characterized by using an Eureka 147 DAB (Digital Audio Broadcasting) receiver. The method of claim 27, The base layer stream and the enhancement layer stream, Digital multimedia broadcasting receiver for high quality video service, characterized in that separated from the frequency deinterleaver of the Eureka 147 DAB receiver. The method of claim 26, The enhancement layer reception processing unit, A layer symbol demapper for symbol demapping the enhancement layer stream; A channel decoder for channel decoding the symbol demapped enhancement layer stream; A demultiplexer for separating and demultiplexing the channel decoded enhancement layer stream into video and audio packets; And A system decoder for decatching the demultiplexed audio and video packets and synchronizing between streams to output enhancement layer audio and video streams. Digital multimedia broadcasting receiver for a high quality video service comprising a. A digital multimedia broadcasting receiver for additional data service, A digital broadcast receiver for receiving a digital broadcast signal, separating a base layer stream and an enhancement layer stream, outputting an enhancement layer stream, and demodulating and outputting the base layer stream through symbol demapping; A base layer reception processor for receiving the demodulated base layer stream, channel decoding, transport stream demultiplexing, and system decoding to output a base layer audio and video stream; An enhancement layer reception processor configured to receive the enhancement layer stream, demodulate it through symbol demapping, channel decode, and output additional data; An A / V decoder for receiving and decoding the base layer audio and video streams; And An additional data decoder for receiving, decoding and outputting the additional data Digital multimedia broadcasting receiving apparatus for an additional data service comprising a. The method of claim 30, The digital broadcast receiver, Digital multimedia broadcasting receiver for additional data service, characterized in that using the Eureka 147 DAB (Digital Audio Broadcasting) receiving device.

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