KR20080036748A - Method for display broadcasting of digital multimedia broadcasting apparatus - Google Patents

Abstract

A broadcasting display method for a DMB apparatus is provided to receive satellite and terrestrial DMB broadcasting signals, divide the broadcasting signals into each packet according to a flag included into a TS(Transport Stream), and decode the satellite and terrestrial DMB broadcasting signals, thereby simultaneously displaying the satellite and terrestrial DMB broadcasting signals on a divided screen. A broadcasting display method for a DMB(Digital Multimedia Broadcasting) apparatus comprises the following steps of: receiving and modulating satellite and terrestrial DMB broadcasting signals(402); dividing the modulated satellite and terrestrial DMB broadcasting signals into each packet(404); dividing the broadcasting signals, divided into the each packet, into the data signal, video signal, and audio signal of the satellite and terrestrial DMB broadcasting signals respectively(406); decoding the respectively divided video signal and audio signal(408); and displaying the decoded respective video signal and audio signal on a divided screen(412).

Description

Broadcast playback method of digital multimedia broadcasting device {METHOD FOR DISPLAY BROADCASTING OF DIGITAL MULTIMEDIA BROADCASTING APPARATUS}

1 is a block diagram of a digital multimedia broadcasting apparatus suitable for reproducing terrestrial DMB and satellite DMB on a divided screen according to the present invention;

2 illustrates inserting a flag for distinguishing terrestrial DMB and satellite DMB onto a transport stream according to the present invention;

3 is a diagram illustrating processing video signals of terrestrial DMB and satellite DMB according to the present invention;

4 is a flowchart illustrating a process of reproducing terrestrial DMB and satellite DMB on a divided screen according to the present invention.

<Description of the symbols for the main parts of the drawings>

102: key input block 104: control block

106: RF module block 108: baseband block

110: packet separation block 112: S-DMB demux block

114: T-DMB Demux Block 116: Decoding Block

118: signal processing block

The present invention relates to a method of reproducing a broadcast in a digital multimedia broadcasting apparatus, and more particularly, to a broadcast reproducing method of a digital multimedia broadcasting apparatus suitable for receiving and playing terrestrial DMB and satellite DMB in a digital multimedia broadcasting apparatus.

As is well known, digital multimedia broadcasting (DMB) is a broadcasting service for digitally fixing various multimedia signals such as voice and video to a receiver, a portable, and a vehicle receiver. For example, terrestrial DMB, satellite DMB, etc. Serviced.

Terrestrial-DMB (T-DMB) is already allocated to channel 12 of the ultra-high frequency (VHF) band corresponding to 174 MHz to 216 MHz of television channels 7 to 13, and such channel 12 is again assigned. It is divided into three frequency blocks (multiplexers), which allocates 1054 Mbps of bandwidth per block to accommodate one video channel and three audio and data channels, thus providing three video channels with the bandwidth of one channel (VHF 12) of analog TV. It can accommodate nine audio and data channels. As such, terrestrial digital multimedia broadcasting can use digital technology to greatly increase frequency efficiency.

In addition, satellite DMB (S-DMB: Satellite-DMB) is serviced in the 2.630 GHz to 2.655 GHz band, which is a much higher frequency band than terrestrial waves. Various content such as video, sports, movies, drama, music, jazz, foreign languages, stocks, traffic, weather, etc. are transmitted to satellites via K-band frequencies (13.824 GHz-13.883 GHz), which are allocated for DMB. S-band (2.630 GHz-2.655 GHz) is transmitted to the terrestrial receiver for service. Since the satellite DMB is relatively high frequency, it can accommodate much more various channels than the terrestrial DMB, and can broadcast nationwide at once.

However, conventionally, when receiving and playing digital multimedia broadcasting, a terrestrial DMB is exclusively received and played or a satellite DMB is exclusively received and played. An integrated DMB receiving apparatus selects and receives either terrestrial DMB or satellite DMB. Select DMB to play. This is inconvenient for the user to receive and play by comparing the terrestrial DMB and satellite DMB, and the inconvenience of the comparison selection of the broadcast channel.

Accordingly, the present invention is to solve the above-mentioned problems of the prior art, and provides a broadcast reproduction method of a digital multimedia apparatus capable of receiving terrestrial DMB and satellite DMB in a digital multimedia broadcasting apparatus and playing them on a divided screen. There is a purpose.

Another object of the present invention is to provide a broadcast reproducing method of a digital multimedia apparatus capable of facilitating selective reproduction through broadcast comparison by reproducing terrestrial DMB and satellite DMB in a divided screen in a digital multimedia broadcasting apparatus.

In order to achieve the above object, the present invention provides a method for reproducing a broadcast in a digital multimedia broadcasting device that receives and reproduces a satellite DMB and a terrestrial DMB, comprising the steps of: receiving and demodulating the satellite DMB and the terrestrial DMB; Separating the broadcast signals of the satellite DMB and the terrestrial DMB into respective packets, and separating the broadcast signals separated into the respective packets into data signals, video signals, and audio signals of the satellite DMB and the terrestrial DMB, respectively; And decoding each of the separated video and audio signals, and reproducing the decoded video and audio signals on a divided screen.

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

A key technical aspect of the present invention is to separate the broadcast signals of the satellite DMB and terrestrial DMB received and demodulated in the digital multimedia broadcasting device into respective packets, and to separate the broadcast signals from the satellite DMB and terrestrial DMB data signals, video signals and audio. By separating the signals into respective signals and decoding the video signals and the audio signals, respectively, and then playing them on the divided screens, it is easy to achieve the object of the present invention through such technical means.

1 is a block diagram of a digital multimedia broadcasting apparatus suitable for reproducing terrestrial DMB and satellite DMB on a divided screen according to the present invention, and includes a key input block 102, a control block 104, and an RF module block 106. , Baseband block 108, packet separation block 110, S-DMB demux block 112, T-DMB demux block 114, decoding block 116, and signal processing block 118. .

Referring to FIG. 1, the key input block 102 generates various operation signals for controlling the operation of a digital multimedia broadcasting system, including, for example, a remote controller and the like. For example, when a key for receiving a digital multimedia broadcast is input using a remote controller or the like, a function of generating a broadcast receiving key operation signal is generated and provided to the control block 104 in response thereto.

In addition, the control block 104 performs overall operation control of the digital multimedia broadcasting system. The control block 104 tunes a corresponding frequency of each of the satellite DMB and the terrestrial DMB to control the frequency of each received broadcast signal into an IF signal. The baseband block 108 provides a control signal for demodulating the IF signal and transmitting the demodulated IF signal to a transport stream (TS).

In addition, the control block 104 provides a control signal for separating the satellite DMB and the terrestrial DMB transmitted from the baseband block 108 into respective packets to the packet separation block 110, and the data signal in the packet of the satellite DMB. The control signal for separating the video signal and the audio signal is provided to the S-DMB demux block 112, and the control signal for separating the data signal, the video signal and the audio signal from the packet of the terrestrial DMB is transmitted to the T-DMB decode. Provided to the mux block 114. Here, the video signal and the audio signal of the separated broadcast signals are transferred to the S-DMB demux block 112 or the T-DMB demux block 114, and the data signal includes electronic program guide information of the MOT channel. Data signal, which is transmitted to the control block 104 and stored in a predetermined memory area as digital multimedia broadcasting information.

In addition, the control block 104 provides a control signal for decoding the broadcast signal (video signal and audio signal) of the satellite DMB and the broadcast signal (video signal and audio signal) of the terrestrial DMB to the decoding block 116, respectively. The signal processing block 118 provides a control signal for simultaneously reproducing the broadcast signal of the decoded satellite DMB and the terrestrial DMB broadcast signal on one divided screen.

Next, the RF module block 106 receives the satellite DMB and the terrestrial DMB, including the satellite DMB receiving module and the terrestrial DMB receiving module, in accordance with control signals provided from the control block 104. Tuning the corresponding frequency, the received broadcast signal is frequency-converted to the IF signal and transferred to the baseband block 108.

In addition, the baseband block 108 demodulates each IF signal of the satellite DMB and terrestrial DMB to be transmitted by orthogonal frequency division multiplexing (OFDM), and broadcasts the broadcast signal according to a fast information channel (FIC) and a main service channel (MSC). (Transport stream) to the packet separation block 110. In this case, a flag for distinguishing the satellite DMB and the terrestrial DMB is inserted and transmitted in a broadcast signal of the satellite DMB and the terrestrial DMB to be received and demodulated.

Referring to these flags, FIG. 2 is a diagram illustrating the insertion of a flag that distinguishes terrestrial DMB from satellite DMB on a transport stream, according to the present invention. The packet start information Sync Byte and error presence information Transport error indicato Payload Unit start indicato, the content of actual data (Paylode), Transport Priority, packet priority information, PID, packet ID information, Transport Scrambling control, encryption method information, Adaptation field control, Adaptation field information, serial number information, It can be seen that a broadcasting method-specific flag according to satellite DMB and terrestrial DMB can be inserted into a header on a transport stream including a continuity counter.

Next, the packet separation block 110 is a broadcast signal of the satellite DMB among the broadcast signals of the satellite DMB and the terrestrial DMB transmitted separately according to the flags included in the transport stream of the satellite DMB and the terrestrial DMB, the S-DMB. The broadcast signal of the terrestrial DMB is transmitted to the T-DMB demux block 114.

The S-DMB demux block 112 divides the broadcast signal of the satellite DMB into a data signal, a video signal, and an audio signal, transfers the data signal to the control block 104, and the video signal and the audio signal are decoded. Forward to 116.

In addition, the T-DMB demux block 114 divides the broadcast signal of the terrestrial DMB into a data signal, a video signal, and an audio signal, transfers the data signal to the control block 104, and decodes the video signal and the audio signal. Forward to block 116.

On the other hand, decoding block 116 is a broadcast signal (video signal and audio signal) of satellite DMB from S-DMB demux block 112 and a terrestrial DMB broadcast signal (video) from T-DMB demux block 114. Signals and audio signals) are reconstructed into the original signals before encoding by using decoding techniques such as variable length decoding, inverse DCT, inverse quantization, and motion compensation, and transmitted to the signal processing block 118, respectively. Here, the video signal may perform MPEG decoding, and the audio signal may perform BSAC (Bit Sliced Arithmetic Coding) decoding.

As an example, FIG. 3 is a diagram illustrating processing video signals of terrestrial DMB and satellite DMB according to the present invention, wherein the decoded satellite DMB video signal and terrestrial DMB signal are represented by y (luminance signal) and CbCr (color difference signal). The satellite DMB video signal including the transmits a predetermined data region to the signal processing block 118, and then the terrestrial DMB video signal including y (luminance signal) and CbCr (color difference signal) is predetermined as the signal processing block 118. The data region can be repeatedly transmitted in a sequential manner.

The signal processing block 118 then processes the broadcast signals (video signals and audio signals) of the satellite DMB and terrestrial DMB transmitted from the decoding block 116, respectively, and divides one screen through a monitor and a speaker (not shown). Play simultaneously. Here, the video signal is displayed in a preset display division method (for example, two division methods of up and down, two division methods of left and right, etc.) according to a preset division number (for example, two divisions, etc.). For example, the audio signal may be output by, for example, outputting an audio signal of one DMB first while muting the audio signal of another DMB.

Next, in the digital multimedia broadcasting apparatus having the above-described configuration, satellite DMB and terrestrial DMB are received and classified according to the flag inserted on the transport stream, and separated into data signals, video signals, and audio signals, respectively. Next, a process of simultaneously decoding each image after decoding them will be described.

4 is a flowchart illustrating a process of reproducing terrestrial DMB and satellite DMB in a divided screen according to the present invention.

Referring to FIG. 4, in the control block 104 of the digital multimedia broadcasting apparatus, a control signal for receiving them according to a key operation signal for requesting reception of satellite DMB and terrestrial DMB provided from the key input block 102 is an RF module block. And the RF module block 106 receives the satellite DMB and the terrestrial DMB from each antenna according to the corresponding frequency through the respective receiving module, and demodulates them through the bass band block 108 accordingly. This broadcast signal is delivered to the port stream (step 402). Here, a flag for distinguishing the satellite DMB and the terrestrial DMB is inserted into the broadcast signal of the received satellite DMB and the terrestrial DMB, and the packet is transmitted, for example, as shown in FIG. 2. Sync Byte as information, Transport error indicato as error information, Payload Unit start indicato as actual information (Paylode), Transport Priority as packet priority information, PID as packet ID, Transport Scrambling control as encryption method information, It can be seen that a broadcasting scheme-specific flag according to satellite DMB and terrestrial DMB can be inserted into a header on a transport stream including an adaptation field control as adaptation field information and a continuity counter as serial number information.

In the packet separation block 110, the packet is divided into satellite DMB and terrestrial DMB packets based on a flag included in the transport stream according to the separation control signal provided from the control block 104. In step 404, the S-DMB demux block 112 and the T-DMB demux block 114 are transferred according to the scheme.

Next, the S-DMB demux block 112 separates the broadcast signal of the satellite DMB transmitted from the packet separation block 110 into a data signal, a video signal, and an audio signal to decode the video signal and the audio signal. In the T-DMB demux block 114, the broadcast signal of the terrestrial DMB transmitted from the packet separation block 110 is divided into a data signal, a video signal, and an audio signal to decode the video signal and the audio signal. (Step 406). At this time, the data signals respectively separated in the S-DMB demux block 112 and the T-DMB demux block 114 are transmitted to the control block 104 as digital multimedia broadcasting information, which is stored in a predetermined memory area. do.

In the decoding block 116, each broadcast signal (video signal) transmitted from the S-DMB demux block 112 and the T-DMB demux block 114 according to the decoding control signal provided from the control block 104. And audio signals) are respectively restored to the original signal before encoding by using a decoding technique such as variable length decoding, inverse DCT, inverse quantization, motion compensation, and the like, and then transmitted to the signal processing block 118 (step 408). . As an example, as shown in FIG. 3, the decoded satellite DMB video signal and the terrestrial DMB signal include a satellite DMB video signal including y (luminance signal) and CbCr (color difference signal) as the signal processing block 118. The data region may be transferred, and then the terrestrial DMB video signal including y (luminance signal) and CbCr (color difference signal) may be sequentially and repeatedly transferred to the signal processing block 118 in a predetermined data region.

In addition, the signal processing block 118 processes the broadcast signals (video signals and audio signals) of the satellite DMB and the terrestrial DMB transmitted from the decoding block 116, respectively, to a screen divided through a monitor and a speaker (not shown). Simultaneous playback (steps 410 and 412). Here, the video signal is displayed in a preset display division method (for example, two division methods of up and down, two division methods of left and right, etc.) according to a preset division number (for example, two divisions, etc.). For example, the audio signal may be output in a manner of muting the audio signal of another DMB while first outputting an audio signal of one DMB.

Therefore, the digital multimedia broadcasting device receives the satellite DMB and the terrestrial DMB, separates the packets according to the flags included in the transport stream, and decodes and signal-processes the satellite DMB and the terrestrial DMB so that they can be simultaneously reproduced on one divided screen. have.

In the above description, the present invention has been described with reference to preferred embodiments, but the present invention is not necessarily limited thereto, and a person having ordinary skill in the art to which the present invention pertains may have various limitations without departing from the technical spirit of the present invention. It will be readily appreciated that various substitutions, modifications and variations are possible.

As described above, the present invention is different from the conventional method of selectively receiving and reproducing any one DMB by receiving and receiving satellite DMB or terrestrial DMB in the digital multimedia broadcasting device. The broadcast signal of the DMB is separated into individual packets, and the broadcast signal is separated into data signals, video signals, and audio signals of the satellite DMB and terrestrial DMB, respectively. By reproducing, the digital multimedia broadcasting apparatus can simultaneously reproduce the satellite DMB and the terrestrial DMB on one divided screen, thereby improving user convenience.

In addition, the present invention can improve the user's ease of use in selecting the digital multimedia broadcasting to be viewed by simultaneously playing the satellite DMB and terrestrial DMB on a divided screen in the digital multimedia broadcasting device.

Claims (5)

A method of playing a broadcast in a digital multimedia broadcasting device that receives and plays satellite DMB and terrestrial DMB, Receiving and demodulating the satellite DMB and terrestrial DMB; Separating the demodulated satellite DMB and terrestrial DMB broadcast signals into respective packets; Dividing the broadcast signal divided into the respective packets into data signals, video signals, and audio signals of the satellite DMB and terrestrial DMB, respectively; Decoding the respective separated video and audio signals; Playing the decoded video and audio signals on a divided screen Broadcast reproduction method of a digital multimedia broadcasting device comprising a. The method of claim 1, The broadcast reproduction method, Storing the separated data signal as broadcast information Broadcast playback method of the digital multimedia broadcasting device further comprising. The method of claim 1, The separating into each packet may include inserting a flag for packet separation into a transport stream of the satellite DMB and the terrestrial DMB, and separating the packets into packets of the satellite DMB and the terrestrial DMB. A broadcast reproduction method of a digital multimedia broadcasting device. The method of claim 1, In the broadcast reproducing method, after the decoding of the video signal and the audio signal, the digital multimedia broadcasting comprising sequentially repeating the video signal of the satellite DMB and the video signal of the terrestrial DMB according to a preset data area. Broadcast playback method of the device. The method of claim 1, The reproduction of the divided one screen comprises: dividing one screen into two to reproduce the satellite DMB and the terrestrial DMB.

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