KR20060066022A - A system for integrate-receiving a terrestrial dmb and a satellite dmb - Google Patents

Abstract

The present invention relates to a terrestrial and satellite DMB integrated receiving system integrating terrestrial DMB and satellite DMB into one module to receive both terrestrial digital multimedia broadcasting (DMB) and satellite DMB. Terrestrial and satellite DMB integrated receiving system according to the present invention, DMB signal receiving antenna for receiving a terrestrial DMB signal and satellite DMB signal for each frequency band; An RF signal selection and tuner unit for discriminating and selecting a terrestrial DMB band or a satellite DMB band with respect to a signal received from a DMB signal receiving antenna; An OFDM demodulator for demodulating an OFDM signal of a terrestrial DMB transmission method; A CDM demodulator for demodulating a CDM signal of a satellite DMB transmission method; System A standard processing unit for processing a signal conforming to the standard of terrestrial DMB; System E standard processing unit for processing satellite DMB technical standard specifications; A demultiplexer configured to determine a decoding method of video, data, or audio from the processed signals of terrestrial and satellite DMB; A DMB signal decoder for decoding a video, data or audio signal according to each broadcasting method by a decoding method received from the demultiplexer; And a user interface unit for transmitting a control signal to the RF signal selection and tuner unit and the demultiplexer unit.

Satellite DMB, Terrestrial DMB, Integrated Reception, OFDM, CDM, Demultiplexer

Description

Terrestrial and satellite digital multimedia broadcasting integrated reception system {A system for integrate-receiving a terrestrial DMB and a satellite DMB}

1 is a configuration diagram of a terrestrial DMB system.

2 is a configuration diagram of a satellite DMB system.

3 is a block diagram of a terrestrial and satellite DMB integrated reception system according to an embodiment of the present invention.

The present invention relates to a terrestrial and satellite DMB integrated reception system. More specifically, the present invention relates to a terrestrial and satellite DMB integrating terrestrial DMB and satellite DMB into one module to receive both terrestrial digital multimedia broadcasting and satellite DMB. An integrated receiving system.

Recently, due to the rapid development of information and communication technology, it is transitioning to the digital age. Accordingly, countries around the world are trying to digitize broadcasting technology such as satellite broadcasting, terrestrial TV, cable broadcasting and radio broadcasting.

The digitalization of the broadcast not only raises the quality of the broadcast service by providing high definition broadcast but also enables the broadcast which does not shake the screen while moving unlike the conventional analog broadcast.

In addition, the newly emerged DMB service based on digital broadcasting technology is a service capable of receiving CD-quality high-quality radio, TV video, and text broadcasting anytime, anywhere up to 200 km on the screen on a 7-inch screen. In this new broadcasting method, mobile multimedia broadcasting is classified into terrestrial DMB and satellite DMB according to transmission media.

Terrestrial DMB provides high quality voice and video services anytime, anywhere using terrestrial DAB (Digital Audio Broadcasting), and delivers various contents such as music, text, and video through portable terminals such as small TVs and PDAs based on mobile reception characteristics. Is a broadcast service.

Satellite DMB transmits broadcast content via satellite, allowing subscribers to watch or listen to multi-channel multimedia broadcasts such as video, audio and data through personal portable or in-vehicle receivers equipped with omnidirectional reception antennas outdoors or on the go. Is a broadcast service.

In other words, the DMB is currently classified into a terrestrial DMB method similar to the Eureka-147, which is being serviced in Europe, and a satellite DMB method that can be directly received by using a satellite.

On the other hand, terrestrial DMB and satellite DMB can be found in the following two major differences.

The first is a modulation scheme. The terrestrial DMB uses an Orthogonal Frequency Division Multiplexing (System A) scheme, and the satellite DMB uses a different modulation scheme by using a Code Division Multiplexing (System E) scheme.

Secondly, video compression for both terrestrial and satellite DMB is set to MPEG-4 Part 10 Advanced Video Coding (AVC). However, in the video compression method, both terrestrial and satellite use AVC, but there are some differences in the coding method itself. In the audio compression scheme, the terrestrial DMB is determined by bit sliced arithmetic coding (BASC-4), and the satellite DMB is determined by AAC (Advanced Audio Codec +) (MPEG-2).

Therefore, the above two considerations should be considered in the method of integrating the terrestrial and satellite DMB modules. However, there is no system for receiving terrestrial and satellite DMB.

An object of the present invention for solving the above problems is the integration of terrestrial and satellite DMB capable of integrating both functions to implement multimedia broadcasting capable of both terrestrial broadcasting using the System-A method and satellite broadcasting using the System-E method. It is for providing a receiving system.

As a means for achieving the above object, the terrestrial and satellite DMB integrated receiving system according to the present invention,

A DMB signal receiving antenna for receiving a terrestrial digital multimedia broadcasting (DMB) signal and a satellite DMB signal for each frequency band;

An RF signal selection and tuner unit for discriminating and selecting a terrestrial DMB band or a satellite DMB band with respect to a signal received from the DMB signal receiving antenna;

An OFDM demodulator for demodulating the OFDM signal of the terrestrial DMB transmission scheme;

A CDM demodulator for demodulating the CDM signal of the satellite DMB transmission method;

A System A standard processing unit processing a signal conforming to the standard of the terrestrial DMB;

A System E standard processing unit processing the satellite DMB technical standard standard;

A demultiplexer configured to determine a method of decoding video, data, or audio from the processed signals of the terrestrial and satellite DMB;

A DMB signal decoder for decoding a video, data or audio signal according to each broadcasting method by a decoding method received from the demultiplexer; And

User interface unit for transmitting a control signal to the RF signal selection and tuner and demultiplexer

Characterized in that it comprises a.

Here, the RF signal selection and tuner unit, L-Band processing unit for processing the frequency of 30MHz ~ 300MHz band of the ultra-high frequency (VHF) which is the terrestrial DMB band; And an S-Band processing unit for processing frequencies in the 2.630 GHz to 2.655 GHz band of the ultra-high frequency (UHF), which is the satellite DMB band.

The DMB signal decoder may include: a video decoder configured to decode an MPEG-4 Part 10 AVC (H.264) stream and output a video signal according to a method determined by the demultiplexer; A data broadcast decoder configured to output data in a form of a serial data stream of demodulated and demultiplexed received signal data according to a method determined by the demultiplexer; And an audio decoder for decoding an AAC + stream and outputting an audio signal according to a method determined by the demultiplexer.

In this case, when the user selects terrestrial or satellite DMB broadcasting, the user interface unit selects the RF signal and transmits a control signal to the tuner unit and the demultiplexer so as to distinguish between terrestrial DMB or satellite DMB.

Here, the RF signal selection and tuner unit receives the terrestrial DMB signal into the L-Band and the satellite DMB signal into the S-Band by the control signal input from the user interface unit.

Here, when the terrestrial DMB signal is input, the System A standard processor processes a signal demodulated through the OFDM demodulator according to the Eureka-147 standard, which is a System A system.

Here, when the satellite DMB signal is input, the System E standard processor processes the signal demodulated through the CDM demodulator according to the System E standard standard.

Here, the signal processed by the System A standard processor or the System E standard processor is characterized in that the decoding method of the video or audio is determined by the demultiplexer.

In the video compression scheme, the DMB signal decoder uses video MPEG-4 Part 10 AVC (H.264) for both the terrestrial and satellite DMB. In the audio compression scheme, the terrestrial DMB is an audio BASC ( MPEG-4), and the satellite DMB uses audio AAC + (MPEG-2).

Here, in the case of the terrestrial DMB, the DMB signal decoder decodes video MPEG-4 Part 10 AVC (H.264) by the video decoder, and decodes audio BASC (MPEG-4) by the audio decoder. In the case of the satellite DMB, video MPEG-4 Part 10 AVC (H.264) is decoded by the video decoder, and audio AAC + (MPEG-2) is decoded by the audio decoder.

According to the present invention, by combining the terrestrial DMB and the satellite DMB into a single module to implement a multimedia broadcast capable of both a terrestrial broadcast using the System-A method and a satellite broadcast using the System-E method, an antenna, a tuner, and a baseband are integrated. It can be configured separately and used as a composite terminal combining terrestrial DMB and satellite DMB.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the terrestrial and satellite DMB integrated reception system according to an embodiment of the present invention.

In the embodiment of the present invention, in order to enable terrestrial and satellite DMB integrated reception, the video compression scheme uses the video MPEG-4 Part 10 AVC (H.264) scheme for both terrestrial and satellite, and in the audio compression scheme, In this case, audio BASC (MPEG-4) is used, and in case of satellite DMB, audio AAC + (MPEG-2) is used to decode accordingly. It consists of blocks.

First, FIG. 1 is a configuration diagram of a terrestrial DMB system.

As mentioned above, the new terrestrial DMB service based on digital broadcasting technology is moving to the same frame rate and data transmission capacity that is several times higher than that of Internet broadcasting (up to 200 km). TV, video and text broadcasts can be received.

Referring to FIG. 1, the terrestrial DMB includes an MPEG-4 encoder 101, a data broadcast server 102, an audio encoder 103, a multiplexer 104, a modulator 105, a high output amplifier 106, Various receiving terminals 108, 109, 110 may be included.

First, in a terrestrial DMB system provided with a music and video service and an interactive content data service using a terrestrial repeater, the MPEG-4 encoder 101 converts an input video signal into a CIF (Common Intermediate Format) class MPEG-4 video. It performs the function.

The data broadcasting server 102 transmits various data streams and data objects which are input data using a packet mode or a stream mode.

The audio encoder 103 performs a function of compressing an input audio signal and transmitting it in a stream mode by using an MPEG-1 / 2 Layer 2 compression scheme.

The multiplexer 104 is the same as the existing Eureka-147 type DAB transmission multiplexer, and receives the MPEG-4 stream from the MPEG-4 encoder 101 in the stream mode, and the audio encoder 103 and the data. MPEG-1 / 2 Layer 2 audio and packet data services, which are audio services, are received from the broadcast server 102 and multiplexed.

The modulator 105 OFDM modulates and outputs the multiplexed input stream.

The high output amplifier 106 transmits the OFDM transmission signal output from the modulator 105 to the antenna 107 on the corresponding channel frequency.

Accordingly, the terrestrial DMB receives OFDM transmission signals from the antenna 107 using fixed 108, portable 109, and mobile 110 receiving terminals, thereby allowing CDs to be walked or cared around at home, at work, or in a car. You will receive quality sound and data and video services.

2 is a configuration diagram of a satellite DMB system.

As described above, the satellite DMB refers to a service that can receive various multimedia information using not only a fixed receiver but also a mobile portable terminal or a vehicle terminal using a fixed receiver using a broadcast or communication satellite.

Referring to FIG. 2, the satellite DMB includes a content provider 201, a satellite DMB broadcasting center 202, a satellite 203, a shadow filler 204, and various receivers 205, 206, and 207. can do.

First, the satellite DMB broadcasting center 202 is organized in a variety of high-quality multi-channel audio broadcasting and traffic information, sports, movies, dramas, car navigation information, securities, weather information received from the content provider 201 in the earth station on the ground The various contents are shot onto the satellite 203 through the Ku band frequencies (12 Hz to 13 Hz).

The satellite 203 is sprayed onto terminals such as a dedicated terminal 205 on the ground, a portable receiver 206, and a vehicle receiver 207 through S bands (2.630 Hz to 2.655 Hz) allocated for DMB.

If it is not possible to directly receive a satellite signal, the satellite 203 to the shadowed area repeater 204 is transmitted through a downlink frequency of the Ku band, and then the shadowed area repeater 204 to the subscriber's terminal is transmitted. By relaying the broadcast signal through the band, the satellite DMB can freely use the DMB service anytime and anywhere.

On the other hand, Figure 3 is a block diagram of a terrestrial and satellite DMB integrated receiving system according to an embodiment of the present invention.

3, the terrestrial and satellite DMB integrated reception system according to an embodiment of the present invention, the terrestrial DMB signal receiving antenna 301, satellite DMB signal receiving antenna 302, RF signal selection and tuner unit 305, OFDM demodulator 306, CDM demodulator 307, System A standard processor 308, System E standard processor 309, demultiplexer 310, DMB signal decoder 314, and user interface 315 ) May be included.

First, since the terrestrial wave and the satellite DMB use different frequency bands, the terrestrial DMB signal reception antenna 301 and the satellite DMB signal reception antenna 302 receive the terrestrial DMB signal or the satellite DMB signal, respectively.

The RF signal selection and tuner unit 305 distinguishes and selects the L-Band processing unit 303 of the terrestrial DMB band and the S-Band processing unit 304 of the satellite DMB band. Here, the L-Band 303 processing unit processes the terrestrial DMB band allocated to 30 MHz to 300 MHz of the ultra high frequency (VHF), and the S-Band 304 processing unit allocates 2.630 GHz to 2.655 GHz of the ultra high frequency (UHF) Processed satellite DMB bands.

The OFDM demodulator 306 demodulates the signals of the terrestrial DMB transmission scheme, and the CDM demodulator 307 demodulates the signals of the satellite DMB transmission scheme, respectively.

The System A standard processor 308 processes the signal according to the Eureka-147 standard of the terrestrial DMB, and the System E standard processor 309 processes the satellite DMB technical standard.

The demultiplexer 310 determines a method of decoding video and audio from the processed signals of the terrestrial and satellite DMB.

In addition, the DMB signal decoder 314 includes a video decoder 311, a data broadcast decoder 312, and an audio decoder 313.

Here, the video decoder 311 performs a function of decoding an MPEG-4 Part 10 AVC (H.264) stream and outputting a video signal, and the data broadcast decoder 312 performs demodulation and demultiplexing reception. The signal data is output in the form of a serial data stream, and the audio decoder 313 performs a function of decoding an AAC + stream and outputting an audio signal.

The user interface unit 315 transmits a control signal to the RF signal selection and tuner unit 305 and demultiplexer 310. That is, when the user selects terrestrial or satellite DMB broadcasting, the user interface unit 315 transmits control signals to the RF signal selection and tuner unit and demultiplexer to distinguish between terrestrial DMB or satellite DMB.

More specifically, referring back to FIG. 3, when the user selects terrestrial or satellite DMB broadcasting, the user interface 315 transmits a control signal to the RF signal selection and tuner 305 and the demultiplexer 310. send. That is, since the terrestrial wave and the satellite DMB use different frequency bands, it is possible to distinguish whether the terrestrial DMB or the satellite DMB is a simple control signal.

Next, the RF signal selection and tuner unit 305 receives the terrestrial DMB signal 301 to the L-Band 303 and the satellite DMB signal 302 to the S-Band 304 by the received control signal. ) Is input according to each frequency band.

If the terrestrial DMB signal is input, the system A standard processor 308 processes the demodulated signal through the OFDM demodulator 306 according to the Eureka-147 standard, which is the System A method.

If the satellite DMB signal is input, the system E standard processing unit 309 processes the signal demodulated through the CDM demodulator 307 according to the system E standard.

The signals processed by the System A standard processor 308 and the System E standard processor 309 determine the decoding method of the video or audio by the demultiplexer 310.

Thereafter, the demultiplexer 310 receives a terrestrial or satellite DMB broadcast determined by a user's selection through a control signal from the user interface 315.

On the other hand, both terrestrial DMB and satellite DMB use MPEG-4 Part 10 AVC (H.264) for video, but there are differences in frame rate and resolution. However, these problems are not much of a problem in integrating the receiving module.

That is, the terrestrial DMB decodes the video MPEG-4 Part 10 AVC (H.264) by the video decoder 311, decodes the audio BASC (MPEG-4) by the audio decoder 313, and the satellite DMB is the video. The MPEG-4 Part 10 AVC (H.264) is decoded by the video decoder 311, and the audio AAC + (MPEG-2) is decoded by the audio decoder 313, thereby eventually integrating the two functions into one block. It can be configured as.

In addition, the data broadcast decoder 312 performs a function of outputting data in the form of a serial data stream of the received signal data in which the terrestrial and satellite DMB broadcast signals are demodulated and demultiplexed, and thus, the DMB signal decoder ( 314 is decoded in a method suitable for each broadcasting method by the receiving method.

As a result, according to the embodiment of the present invention, by combining the terrestrial DMB and the satellite DMB into one module, it is possible to implement a multimedia broadcast capable of both terrestrial broadcasting using the System-A method and satellite broadcasting using the System-E method.

While the invention has been shown and described in connection with specific embodiments thereof, it will be appreciated that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

According to the present invention, the antenna, the tuner, and the baseband are separately configured to be used as a composite terminal combining terrestrial DMB and satellite DMB, thereby reducing the cost and reducing the cost, as well as advertising-based free services such as terrestrial DMB or content center. The subscriber can select and use satellite DMB, a paid service of.

Claims (10)

A DMB signal receiving antenna for receiving a terrestrial digital multimedia broadcasting (DMB) signal and a satellite DMB signal for each frequency band; An RF signal selection and tuner unit for discriminating and selecting a terrestrial DMB band or a satellite DMB band with respect to a signal received from the DMB signal receiving antenna; An OFDM demodulator for demodulating the OFDM signal of the terrestrial DMB transmission scheme; A CDM demodulator for demodulating the CDM signal of the satellite DMB transmission method; A System A standard processing unit processing a signal conforming to the standard of the terrestrial DMB; A System E standard processing unit processing the satellite DMB technical standard standard; A demultiplexer configured to determine a method of decoding video, data, or audio from the processed signals of the terrestrial and satellite DMB; A DMB signal decoder for decoding a video, data or audio signal according to each broadcasting method by a decoding method received from the demultiplexer; And User interface unit for transmitting a control signal to the RF signal selection and tuner and demultiplexer Terrestrial and satellite DMB integrated receiving system comprising a. The method of claim 1, wherein the RF signal selection and tuner unit, An L-Band processor for processing frequencies in the 30 MHz to 300 MHz band of the ultra-high frequency (VHF) which is the terrestrial DMB band; And S-Band processing unit for processing the frequency of the 2.630 kHz to 2.655 kHz band of the ultra-high frequency (UHF) which is the satellite DMB band Terrestrial and satellite DMB integrated receiving system comprising a. The method of claim 1, wherein the DMB signal decoding unit, A video decoder configured to decode an MPEG-4 Part 10 AVC (H.264) stream and output a video signal according to a method determined by the demultiplexer; A data broadcast decoder configured to output data in a form of a serial data stream of demodulated and demultiplexed received signal data according to a method determined by the demultiplexer; And An audio decoder for decoding an AAC + stream and outputting an audio signal according to a method determined by the demultiplexer Terrestrial and satellite DMB integrated receiving system comprising a. The method of claim 1, When the user selects terrestrial or satellite DMB broadcasting, the user interface unit transmits a control signal to the RF signal selection and tuner unit and demultiplexer to distinguish between terrestrial DMB or satellite DMB. . The method of claim 4, wherein The RF signal selection and tuner unit receives a terrestrial DMB signal into an L-Band and receives a satellite DMB signal into an S-Band according to a control signal input from the user interface unit. . The method of claim 5, And the System A standard processing unit processes the signal demodulated through the OFDM demodulator according to the Eureka-147 standard, which is a System A system, when the terrestrial DMB signal is input. The method of claim 5, And the System E standard processing unit processes the signal demodulated through the CDM demodulator according to the System E standard standard when the satellite DMB signal is input. The method of claim 5, And a decoding method of a video or audio signal is determined by the demultiplexing unit for the signal processed by the System A standard processing unit or the System E standard processing unit. The method of claim 3, In the video compression scheme, the DMB signal decoder uses video MPEG-4 Part 10 Advanced Video Coding (H.264) in both the terrestrial and satellite DMB schemes, and the terrestrial DMB in the audio compression scheme. Terrestrial and satellite DMB integrated receiving system using audio bit sliced arithmetic coding (BASC-4), and the satellite DMB uses an audio advanced audio codec (MPAC-2). The method of claim 9, In the case of the terrestrial DMB, the DMB signal decoder decodes a video MPEG-4 Part 10 AVC (H.264) in the video decoder, decodes an audio BASC (MPEG-4) in the audio decoder, In the case of satellite DMB, terrestrial and satellite DMB integration is characterized in that video MPEG-4 Part 10 AVC (H.264) is decoded by the video decoder and audio AAC + (MPEG-2) is decoded by the audio decoder. Receiving system.

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