KR100822132B1 - Method for display broadcasting of digital multimedia broadcasting apparatus - Google Patents

Abstract

A method for reproducing broadcasting in a digital multimedia broadcasting apparatus is provided to pause the decoding of a video signal according to preset buffering conditions during the decoding of the video signal, resume the decoding of the video signal if a preset buffering area is ensured during the pause of the video decoding, and reproduce the decoded video signal, thereby preventing the overflow of the video signal to reproduce a normal video signal. A method for reproducing broadcasting in a digital multimedia broadcasting apparatus comprises the following steps of: receiving and demodulating digital multimedia broadcasting signals to divide the digital multimedia broadcasting signals into a data signal, a video signal, and an audio signal(402,404); storing the divided data signal as broadcasting information and buffering the divided video signal(406); decoding the buffered video signal if the video signal is buffered up to a preset level(408); pausing the decoding of the video signal according to preset buffering conditions during the decoding of the video signal(412); resuming the decoding of the video signal if a preset buffering area is ensured during the pause of the decoding(416); and reproducing the decoded video signal and decoding the divided audio signal.

Description

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

1 is a diagram illustrating a conventional decoding of a digital multimedia broadcasting according to the prior art;

2 is a block diagram of a digital multimedia broadcasting device for decoding digital video broadcasting by decoding according to buffering of a video signal according to the present invention;

3a to 3d illustrate decoding according to the buffering of a video signal in accordance with the present invention;

4 is a flowchart illustrating a process of playing a digital multimedia broadcasting by decoding according to buffering of a video signal 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: demux block 112: video buffer block

114: buffer management block 116: decoding block

118: signal processing block

The present invention relates to a method of playing a digital multimedia broadcasting, and more particularly, to a broadcast of a digital multimedia broadcasting apparatus suitable for preventing an overflow of a video signal when decoding and playing a video signal of a digital multimedia broadcasting. It is about a reproduction method.

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.

And, terrestrial DMB is already allocated to channel 12 of the very high frequency (VHF) bands corresponding to 174MHz to 216MHz of television channels 7 to 13, and the channel 12 is divided into three frequency blocks (multiplexers). Allocates 1054 Mbps of bandwidth per block to accommodate one video channel and three audio and data channels, accommodating three video channels and nine audio and data channels with the bandwidth of one channel (VHF 12) on analog TV can do. As such, terrestrial digital multimedia broadcasting can use digital technology to greatly increase frequency efficiency.

In addition, satellite DMB is serviced in the 2.630 GHz to 2.655 GHz band, which is much higher than the terrestrial, which is much higher than terrestrial, and is covered by news, music videos, sports, movies, dramas and music from the ground-based satellite DMB center. Various content such as, jazz, foreign language, securities, traffic, weather, etc. to K-band frequency (13.824 GHz-13.883 GHz) to the satellite, and the S-band (2.630 GHz-2.655 GHz) Service by sending to the ground receiving device through. 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.

Meanwhile, FIG. 1 is a diagram illustrating decoding of a general digital multimedia broadcasting according to the related art.

Referring to FIG. 1, a receiving end of a digital multimedia broadcasting apparatus receives a digital multimedia broadcasting, parses a broadcasting signal of a transport stream (TS) through a demux, extracts a video signal, that is, an elementary stream (ES), and extracts a video ES. Store in a buffer.

A decoder (eg, an H.264 decoder) reads these video signals, decodes them one frame, and stores them in a decoded picture buffer (DPB). In a display controller, for example, In a 1/30 second time period, the video signal decoded by the DPB is extracted and displayed on the monitor.

However, in the decoding process as described above, an interrupt is generated at the time of extracting and displaying the decoded video signal from the display controller, and the decoding is performed by starting decoding of the next one frame. If there is a difference between the decoding speed of the multimedia broadcasting device and the reception speed of the TS, an overflow occurs in the video ES buffer, which makes it difficult to play the digital multimedia broadcasting normally, which causes a user inconvenience. It is true.

Accordingly, the present invention is to solve the above problems of the prior art, the digital multimedia broadcasting apparatus of the digital multimedia broadcasting apparatus which can prevent the overflow of the video signal by adjusting the decoding time in accordance with the state of the buffer to decode The purpose is to provide a regeneration method.

Another object of the present invention is to provide a broadcast reproduction method of a digital multimedia broadcasting device capable of performing normal broadcast reproduction by preventing an overflow by generating and decoding an interrupt according to a preset buffering state in the digital multimedia broadcasting device.

In order to achieve the above object, the present invention provides a method for reproducing a broadcast in a digital multimedia broadcasting apparatus for receiving and reproducing digital multimedia broadcasting, comprising the steps of: receiving and demodulating the digital multimedia broadcasting to separate data signals, video signals, and audio signals. And storing the separated data signal as broadcast information, buffering the separated video signal, decoding the buffered video signal when the video signal is buffered by a predetermined level, and Pausing the decoding of the video signal according to a preset buffering condition during decoding; re-decoding the video signal if a predetermined buffering area is secured during the pause of the decoding; and Play, and the separated The present invention provides a broadcast reproduction method of a digital multimedia broadcasting device comprising decoding and outputting an audio signal.

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 that the normal video signal cannot be reproduced by the overflow of the video signal due to the decoding speed and the interruption caused by the reception speed while receiving and playing the digital multimedia broadcasting. Unlike, it receives and demodulates the digital multimedia broadcast to separate the data signal, the video signal and the audio signal, buffers the separated video signal, decodes the buffered video signal when the video signal is buffered to a preset level, and the video During decoding of the signal, the decoding of the video signal is paused according to a preset buffering condition. If the preset buffering area is secured during the pause of decoding, the decoding of the video signal is performed again and the decoded video signal is reproduced. In the present invention by means It can easily attain the bar.

2 is a block diagram of a digital multimedia broadcasting apparatus for decoding a video signal according to the present invention and reproducing digital multimedia broadcasting. The key input block 102, the control block 104, and the RF module block 106 are shown in FIG. , Base band block 108, demux block 110, video buffer block 112, buffer management block 114, decoding block 116, and signal processing block 118.

Referring to FIG. 2, the key input block 102 generates various operation signals for controlling the operation of the 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 module 104 tunes a corresponding frequency of the digital multimedia broadcasting system and converts a control signal for converting a received broadcast signal into an IF signal. And a control signal for demodulating the IF signal and transmitting a broadcast signal of a transport stream (TS) to the demux block 110 to the base band block 108.

In addition, the control block 104 provides a control signal for separating the transmitted broadcast signal into a data signal, a video signal, and an audio signal to the demux block 110, and receives the data signal in a predetermined memory area as broadcast information. The video signal is provided to the demux block 110 to transmit a control signal to the video buffer block 112.

Meanwhile, the control block 104 provides a control signal for buffering the video signal transmitted from the demux block 110 to the video buffer block 112 and, when buffered by a predetermined level, decodes the video signal. The signal is provided to the decoding block 116, and a control signal for signal processing and reproducing the broadcast signal is provided to the signal processing block 118. Here, in the control block 104, the video buffer block 112 and the decoding block 116 pause the decoding according to a preset buffering condition at the time of buffering the video signal, or perform the decoding again when a preset buffering area is secured. ) To the buffer management block 114.

Next, the RF module block 106 tunes the corresponding frequency of the terrestrial multimedia broadcast according to the control signal provided from the control block 104 to frequency convert the received broadcast signal into an IF signal and converts the received broadcast signal into an IF signal to the baseband block 108. To pass.

The baseband block 108 demodulates the transmitted IF signal using an orthogonal frequency division multiplexing (OFDM) scheme and decodes the broadcast signal to the demux block 110 according to the fast information channel (FIC) and the main service channel (MSC). To pass.

Meanwhile, the demux block 110 separates the broadcast signal transmitted from the baseband block 108 into a data signal, a video signal, and an audio signal, transfers the data signal to the control block 104, and the video signal is a video buffer. Forward to block 112. Here, the audio signal is passed to the decoding block 116.

Next, the video buffer block 112 buffers the video signal transmitted from the demux block 110 and, when buffered by a predetermined level, transfers this information to the buffer management block 114 to the decoding block 116. Delivers the buffered video signal and from the demux block 110 in accordance with the pause signal from the buffer management block 114 provided in accordance with a preset buffering condition while delivering the video signal to the decoding block 116. Simultaneously buffer the video signal and pause delivery of the video signal to decoding block 116. Here, the preset buffering condition means a point in time at which an address to write to the buffering area when buffering and an address to read in the buffering area when decoding are the same according to the decoding speed and the broadcast reception speed, which is the decoding speed. This occurs when is relatively faster than the broadcast reception speed.

In addition, the video buffer block 112 only buffers the video signal from the demux block 110, and when the preset buffering area is secured, the video buffer block 112 transfers this information to the buffer management block 114. The video signal from the demux block 110 is buffered and transmitted to the decoding block 116 according to the re-execution signal transmitted from the 114. Here, the preset buffering area means a difference between an address that writes to the buffering area when buffering and an address that is read from the buffering area when decoding. When such an area is secured, the decoding process of the video signal is performed again. do.

The buffer management block 114 then decodes the control block 104 and the decoding block 116 to decode the video signal according to the buffering information transferred from the video buffer block 112 in accordance with the management control signal from the control block 104. Provides a decoded signal and pauses decoding of the video signal to the video buffer block 112 and the decoding block 116 when the buffering condition meets the preset buffering condition through the video buffer block 112 when decoding the video signal. To pass the signal.

In addition, the buffer management block 114, if the predetermined buffering area is secured in the video buffer block 112 while the decoding of the video signal is paused, the video buffer block 112 and the signal for decoding the video signal accordingly. Transfer to decoding block 116.

Meanwhile, the decoding block 116 restores the transmitted broadcast signal (video signal and audio signal) to the original signal before encoding using decoding techniques such as variable length decoding, inverse DCT, inverse quantization, and motion compensation. Transfer to signal processing block 116. Here, the video signal may perform MPEG decoding, and the audio signal may perform BSAC (Bit Sliced Arithmetic Coding) decoding.

In addition, the decoding block 116 is a video buffer block 112 according to a decoding control signal selectively provided according to a predetermined level, a preset buffering condition, and a preset buffering area from the control block 104 and the buffer management block 114. Receives the video signal from) and decodes it to the signal processing block 118.

Next, the signal processing block 118 performs signal processing on the transmitted broadcast signals (video signals and audio signals) and reproduces them through a monitor and a speaker (not shown).

As an example, the decoding process of the present invention will be described in detail with reference to FIGS. 3A to 3D. As shown in FIG. 3A, a video signal is buffered according to a write address wptr in the video buffer block 112. While the video signal is transmitted and decoded, as shown in FIG. 3B, when the write address wptr and the read address rptr become the same, an interrupt signal is generated, and thus the decoding is paused. In FIG. 3C, if a preset buffering area is secured, that is, a value larger than a threshold, decoding of the video signal is performed again as shown in FIG. 3D.

Next, in the digital multimedia broadcasting apparatus having the above-described configuration, the video signal is decoded when buffered by a predetermined level, and when the preset buffering condition is reached, the video buffer is paused after the decoding of the video signal is paused. The process of reproducing the digital multimedia broadcasting by performing the decoding of the signal will be described.

4 is a flowchart illustrating a process of reproducing digital multimedia broadcasting by decoding according to buffering of a video signal according to the present invention.

Referring to FIG. 4, during the digital broadcast reception of the digital multimedia broadcasting apparatus (step 402), the demux block 110 transmits a broadcast signal according to a control signal provided from the control block 104 in accordance with a control signal 104. (Step 404).

In the video buffer block 112, the video signal transmitted from the demux block 110 is buffered (step 406). When the video signal is buffered by a predetermined level, the video buffer block 112 transmits this information to the buffer management block 114, and the decoding block ( The buffered video signal is passed to 116, and decoding block 116 then decodes this video signal (step 408).

On the other hand, the video buffer block 112 reads from an address that writes to the buffering area during buffering and a buffering area during decoding according to a preset buffering condition, for example, a decoding speed and a broadcast reception speed, during decoding of the video signal. It is checked if the addresses are at the same time (step 410).

As a result of the check in the step 410, if the write address and the read address are the same, the video buffer block 112 determines the demux block according to the pause signal from the buffer management block 114 provided based on a preset buffering condition. The video signal from 110 is buffered and at the same time the video signal delivery to decoding block 116 is paused to pause decoding of the video signal through decoding block 116 (step 412). Here, the case where the write address and the read address are the same occurs when the decoding speed is relatively faster than the broadcast reception speed.

Meanwhile, in the video buffer block 112, whether a difference between an address to be written to the buffering area during buffering and a address to be read in the buffering area during decoding is greater than a value while pausing decoding of the video signal. Check (step 414). Here, a means a minimum buffering area for preventing overflow in decoding the video signal.

As a result of the check in the step 414, if the difference is greater than the value of a, the video buffer block 112 secures a predetermined buffering area accordingly, and transfers this information to the buffer management block 114. Accordingly, the video signal from the demux block 110 is buffered and transferred to the decoding block 116 according to the re-execution signal transmitted from the buffer management block 114, thereby decoding the video signal through the decoding block 116. Repeat step 416.

On the other hand, if the difference is less than the value of a as a result of the check in step 414, the decoding of the video signal is continuously suspended (step 412).

Subsequently, when the video signal is decoded and transmitted, including the case where the write address and the read address are not the same as the result of the check in step 410, the digital multimedia broadcasting is reproduced through the signal processing block 118 (step 418). ).

In the foregoing description, the present invention has been described with reference to preferred embodiments, but the present invention is not necessarily limited thereto. Those skilled in the art will appreciate that the present invention may be modified without departing from the spirit of the present invention. It will be readily appreciated that branch substitutions, modifications and variations are possible.

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As described above, the present invention can not reproduce a normal video signal due to the overflow of the video signal due to the interruption rate due to the decoding speed and the reception speed while receiving and playing digital multimedia broadcasting. Unlike, it receives and demodulates the digital multimedia broadcast to separate the data signal, the video signal and the audio signal, buffers the separated video signal, decodes the buffered video signal when the video signal is buffered to a preset level, and the video During decoding of the signal, the decoding of the video signal is paused according to a preset buffering condition. If the preset buffering area is secured during the decoding pause, the decoding of the video signal is performed again, and the decoded video signal is reproduced. Video signal from the device The normal video signal can be reproduced by preventing overflow.

Claims (4)

delete A method of reproducing a broadcast in a digital multimedia broadcasting apparatus for receiving and playing digital multimedia broadcasting, the method comprising: receiving and demodulating a digital multimedia broadcasting to separate data signals, video signals, and audio signals; Storing the separated data signal as broadcast information and buffering the separated video signal; Decoding the buffered video signal when the video signal is buffered by a predetermined level; Pausing decoding of the video signal according to a preset buffering condition during decoding of the video signal; Re-decoding the video signal if a predetermined buffering area is secured during pause of the decoding; Playing the decoded video signal, decoding and outputting the separated audio signal Broadcast reproduction method of a digital multimedia broadcasting device comprising a. A method of reproducing a broadcast in a digital multimedia broadcasting apparatus for receiving and playing digital multimedia broadcasting, the method comprising: receiving and demodulating a digital multimedia broadcasting to separate data signals, video signals, and audio signals; Buffering the separated video signal; Decoding the buffered video signal when the video signal is buffered by a predetermined level; During the decoding of the video signal, the video is written according to a preset buffering condition that an address to be written to the buffering area when buffering according to a decoding rate and a broadcast receiving speed is the same time as an address to be read from the buffering area when decoding. Pausing decoding of the signal; Re-decoding the video signal if a predetermined buffering area is secured during pause of the decoding; Playing the decoded video signal Broadcast reproduction method of a digital multimedia broadcasting device comprising a. A method of reproducing a broadcast in a digital multimedia broadcasting apparatus for receiving and playing digital multimedia broadcasting, the method comprising: receiving and demodulating a digital multimedia broadcasting to separate data signals, video signals, and audio signals; Buffering the separated video signal; Decoding the buffered video signal when the video signal is buffered by a predetermined level; Pausing decoding of the video signal according to a preset buffering condition during decoding of the video signal; If the difference between the address that writes to the buffering area when buffering and the address that is read from the buffering area when decoding is different enough to secure a preset area while the decoding is paused, the preset buffering area is secured. Re-decoding the video signal; Playing the decoded video signal Broadcast reproduction method of a digital multimedia broadcasting device comprising a.

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