KR20060067848A - Device and method for demultiplexing received transport stream in digital broadcasting receiver - Google Patents

Abstract

The demultiplexing apparatus of a digital broadcast receiver for processing packet data consisting of a packet header and a payload includes a buffer for buffering input packet data and a plurality of processing units connected in parallel to the buffer, and the processing units are buffered. The packet header of the packet data is checked to determine whether the additional information is included, and the packet header processing unit generates a control signal according to whether the additional information is included, and the packet header processing unit processes the additional information from the payload data buffered by the control. Audio or video data of the additional information processor, the PES header processor for processing the PES header from the payload data buffered by the control of the packet header processor, and the payload data buffered by the control of the PES header processor. It is composed of a data processing unit for generating the output to the corresponding decoder.

Digital Broadcast Receiver, Demultiplexing, Sync, Packet

Description

DEVICE AND METHOD FOR DEMULTIPLEXING RECEIVED TRANSPORT STREAM IN DIGITAL BROADCASTING RECEIVER}

1 is a view for explaining the concept of multiplexing a transmission signal in a digital broadcast transmitter;

2 is a diagram illustrating a concept of demultiplexing a signal received by a digital broadcast receiver.

3 is a diagram illustrating a configuration of a demultiplexer in a conventional digital broadcast receiver.

4 is a flowchart illustrating a procedure of detecting a synchronization signal in the demultiplexer as shown in FIG.

5 is a diagram illustrating a configuration of a digital broadcast receiver.

6 is a diagram illustrating a configuration of a multimedia processing unit in FIG. 5.

7 is a diagram illustrating a configuration of a demultiplexer according to an embodiment of the present invention in a multimedia processing unit of a digital broadcast receiver.

8A to 8C are diagrams showing the configuration of a received packet.

9A to 9C are diagrams showing the configuration of additional information included in a received packet.

10A to 10D are diagrams showing the configuration of PES information included in a received packet.

FIG. 11 is a diagram showing the configuration of a synchronization searching unit according to the embodiment of the present invention in FIG.

FIG. 12 is a flowchart illustrating a procedure of searching for a synchronization signal in the synchronization search unit of FIG.

13A to 13C are views illustrating a configuration of an input buffer according to an embodiment of the present invention in FIG.

14A and 14B are flowcharts illustrating a procedure of processing a packet header in the packet header processing unit of FIG. 7 according to an embodiment of the present invention.

15 is a flowchart illustrating a procedure of processing additional information in the additional information processing unit of FIG. 7 according to an embodiment of the present invention.

16 is a flowchart illustrating a procedure of processing PES header information in the PES header processing unit of FIG. 7 according to an embodiment of the present invention.

17 is a diagram illustrating a configuration of a broadcast receiver for receiving IP-based broadcast data according to an embodiment of the present invention.

18 is a diagram illustrating a configuration of a multimedia processing unit which processes an IP-based broadcast packet data stream according to an embodiment of the present invention.

The present invention relates to an additional service apparatus and method of a mobile terminal, and more particularly, to an apparatus and method capable of receiving and processing a digital broadcast signal.

Currently, standards for digital broadcasting are actively in progress worldwide. In the case of digital broadcasting, there are digital multimedia broadcasting (DMB) in the United States and digital video broadcasting (DVB) in Europe. The portable terminal including the digital broadcast receiver includes a tuner, a demodulator, a multimedia processing unit, and the like for digital broadcast reception.

FIG. 1 is a diagram for explaining an operation of multiplexing a TS signal in the digital broadcasting receiver.

Referring to FIG. 3, the video encoder 111 of the transmitter generates video elementary stream (ES) by encoding video data. The video ES may be MPEG-2, MPEG4 or H.264 video data. The audio encoder 121 encodes audio data to generate an audio ES. The audio ES may be MPEG1 (mp1, mp2, mp3), AAC or BSAC audio data.

In order to multiplex the video, audio and data, a packetization process is required. Accordingly, the video packet assembly unit 113 outputs the packetized video PES by adding time information, additional information, and a packet header to the video ES signal. The audio packet assembly unit 313 also adds the above information to the audio ES, assembles them into audio packets, and outputs an audio PES signal. In addition, a data packet assembly (not shown) performs a similar operation.

The multiplexer 130 multiplexes the video, audio, and data PES signals and outputs the TS signals. The multiplexer 130 performs a function of multiplexing a plurality of inputs into a single output. In this case, the inputs may be broadcast information data packets for video, audio, and program and service related information.

In the configuration of FIG. 1, the packet assembly units 113 and 123 and the multiplexer 130 may be TS multiplexers.

The demultiplexer 140 of the digital broadcast receiver for receiving the multiplexed TS signal as described above may have a structure as shown in FIG. 2.

Referring to FIG. 2, the demultiplexer 140 receiving the TS signal analyzes header information of the TS signal, separates video, audio, and data, and outputs corresponding PES signals. Then, the video packet decomposition unit 151 receives the video PES separated by the demultiplexer 340, analyzes the header of the received video PES signal, generates a video ES signal, and outputs the video ES signal to the video encoder 253. In addition, the audio packet decomposition unit 161 and the audio decoder 163 perform the same operation. In the following description, the demultiplexer will be described as including the demultiplexer 140 and the packet breakers 151 and 161.

Accordingly, it can be seen that the demultiplexer of the digital broadcast receiver performs the reverse operation of the multiplexer of the digital broadcast transmitter. 3 is a diagram illustrating a configuration of the demultiplexer.

Referring to FIG. 3, the sync search unit 211 detects sync bytes of the packet header of the received TS signal, and stores the received TS signal in the input buffer 221 when the sync byte is detected. Then, the input buffer 421 buffers the data of the packet size, and the packet header processing unit 213 extracts and processes the packet header from the buffer 221 and outputs the remaining data except for the packet header to the buffer 223. The additional information processor 215 extracts and processes additional information from the buffer 223, and outputs remaining data except for the additional information to the buffer 225. The PES header processing unit 217 extracts and processes PES header information from the buffer 225, and outputs remaining information except for the PES header to the buffer 227. The data processor 219 extracts data from the buffer 227 and outputs the data to the video ES or the audio ES.

The conventional demultiplexer 140 having the configuration as shown in FIG. 3 has a serial data processing structure. That is, when the sync search unit 211 detects the byte sync signal, the buffer 421 buffers subsequent data in the packet size in the input buffer 421, and the packet header processor 213 drives after one packet of data is buffered in the buffer 421. The packet header is analyzed. As described above, the conventional demultiplexer includes buffers 221-223 at the front end of each processing unit, and uses a method of processing the packet by receiving the packet data processed at the front end. Therefore, since the demultiplexing operation of the serial structure is performed, a delay occurs when multiplexing the input TS signal.

In addition, the demultiplex structure of the serial structure may perform unnecessary data processing operations. In this case, the packets constituting the input TS signal may not include additional information and / or PES information. That is, most packets constituting the received TS signal may be packets composed of pure data. In this case, although the packet is composed of pure data only, it passes through the additional information processing unit 215 and / or the PES header processing unit 217. In this case, unnecessary processing may be performed, resulting in an increase in system load and a decrease in processing speed. have. That is, when the packet data is input, the actual data packet (Audio / Video Data (ES)) is much more than the PES header packet (PES Header Packet), so most of the processing in the PES header processing unit is transferred to the data processing unit and Only ES extraction is done.

In addition, the structure of the demultiplexer 210 as shown in FIG. 3 has a structure including buffers 223 to 227 at the front and / or rear ends of the processing units. In this case, the buffers 221 to 227 are buffers having a capacity larger than the packet size, and thus the buffer memory becomes large.

4 is a flowchart illustrating a procedure for searching for synchronization of a TS signal (packet stream) input from the demultiplexer.

Referring to FIG. 4, the sync search unit 211 checks each byte of an input TS signal. If the input byte is a sync byte (“0X47”), the sync search unit 211 detects it in step 261, and in step 267. The first byte is rearranged and transmitted to the buffer 221. If not, the byte is transferred to the predetermined byte buffer of the buffer 221 at step 263. After transmitting the input byte data as described above, in step 265, the next byte of the buffer 221 is connected, and when the next byte is input, it is transmitted to the next byte position of the current buffer. The above operation is repeated until the end point.

As described above, the conventional packet synchronization searches for input byte data and repeats the operation of rearranging the buffer position of the buffer 221 when the synchronization byte is a synchronization byte. Therefore, in the conventional synchronization detection method, the synchronization search unit 211 should detect the synchronization signal for every packet of the TS signal in the demultiplexer 140 having the serial structure as shown in FIG. That is, the synchronization searching unit 211 should detect the synchronization signal for every packet of the TS signal. That is, the synchronization searching unit 211 detects the synchronization signal of the packet data, and after detecting the synchronization signal, detects the beginning of the packet data and applies the remaining packet data to the buffer 221. However, in general, the TS signal is a packet stream, and once the synchronization signal of the packet data is detected, the position of the synchronization signal of the continuous packet data can be known. Therefore, although the packet data can be synchronized without detecting the synchronization signal for every packet, the conventional demultiplexer 140 repeatedly performs the operation of detecting the synchronization signal for every packet.

Accordingly, an object of the present invention is to provide an apparatus and method for demultiplexing data received at a digital broadcast receiver into parallel structures and distributing the data to respective decoders.

Another object of the present invention is to buffer the data received from the digital broadcast receiver to a packet size, and after analyzing the header of the buffered packet data, a corresponding processing unit is operated according to the header information to process the packet data to demultiplex. It is to provide an apparatus and method that can be.

Another object of the present invention is to buffer the data received from the digital broadcast receiver to a packet size, and after analyzing whether the additional information is included in the header information of the buffered packet data, if there is no additional information, only the PES header processing unit receives it. Disclosed are an apparatus and a method capable of demultiplexing the generated data.

Another object of the present invention is to buffer the data received from the digital broadcast receiver to a packet size, and analyzes whether the additional information is included in the buffered packet data, and if the additional information is included, the additional information processor is driven to process the additional information. It is to provide an apparatus and method that can be.

It is still another object of the present invention to provide an apparatus and method for buffering serial data received from a digital broadcast receiver and outputting the buffered packet data in parallel when the buffered packet size is transmitted to a processor.

Still another object of the present invention is to check the synchronization signal of the packet data received from the digital broadcast receiver, and if the asynchronous state, the synchronization of the packet data by delaying the input data by extracting the subtraction value after checking the synchronization position. The present invention provides an apparatus and method.

In order to achieve the above object, a demultiplexing apparatus of a digital broadcast receiver for processing packet data including a packet header and a payload according to an embodiment of the present invention includes a buffer for buffering input packet data, and a parallel connection to the buffer. And a plurality of processing units, wherein the processing units are configured to inspect a packet header of the buffered packet data to determine whether additional information is included and generate a control signal according to whether the additional information is included; An additional information processing unit for processing additional information from the buffered payload data under control of a packet header processing unit, a PES header processing unit for processing a PES header from the buffered payload data under control of the packet header processing unit; Audio or video data of the buffered payload data is controlled by a PES header processor. Generate the emitter to the audio or video to yieseu characterized by consisting of a data processing unit for outputting to the decoder corresponding to each.

The packet header processing unit analyzes the additional information control parameter of the packet header to determine whether the payload data includes additional information, and controls the additional information processing unit to process the additional information when the additional information is included. If the additional information is not included, the operation of the PES header processing unit may be controlled.

The additional information processor analyzes the length of the additional information by analyzing the additional information field buffered in the buffer. When the payload data includes only the additional information, the additional information processor processes the additional information and transmits the additional information to the controller. If the data includes other data, the data location other than the additional information buffered in the buffer is transmitted to the PES header processing unit, and the additional information is processed and transmitted to the controller.

The PES header processor checks whether the payload buffered in the buffer includes the PES header, checks the length of the PES header when the PES header is included, processes the PES header, and transfers it to the control unit. It is characterized by passing the data position of the data processing unit.

The packet header processor analyzes a PID of a packet header and transmits a PID for identifying the buffered packet to the data processor, and the data processor generates audio or video data buffered in the buffer as audio or video data. Demultiplexer of the digital broadcast receiver, characterized in that for transmitting to each corresponding decoder.

The buffer outputs first and second buffers having a packet data size, packet data stored in the second buffer while storing the input packet data in the first buffer, and stores the input packet data in a second buffer. And an address generator for controlling to output the packet data stored in the first buffer while storing in the buffer. The buffer may further include a dual port memory having the data size, a first address generator configured to store the input packet data in the memory, and a second address generator configured to output the packet data stored in the memory. do.

In addition, by checking the buffering position of the sync byte in the packet data buffered in the buffer, and detecting a subtraction value by examining a position out of the sync byte buffering position of the buffer, the byte data of the packet data is stored according to the subtraction value. A synchronization search unit for delaying packet synchronization is further provided. The sync search unit checks whether the byte data stored in the buffer is a sync byte, and checks the buffering position of the sync byte stored in the buffer when the sync check unit detects the sync byte. And a delay value extracting unit for calculating a subtraction value from the sync byte buffering position to the buffering position of the stored sync byte byte, and a delay unit for delaying the input packet data according to the calculated subtraction value and buffering the buffer data in the buffer. The buffering position of the sync byte set in the buffer may be a first byte buffering position of the buffer.

In addition, the broadcast data receiving apparatus of the mobile terminal having a digital broadcast receiver according to an embodiment of the present invention for achieving the above object, a broadcast receiver for receiving and demodulating the signal of the set broadcast channel to output a packet data stream, And a multimedia processor for analyzing the packet data stream to generate decoded video and audio data, a display unit for displaying the decoded video data, and a speaker for reproducing the decoded audio data. A demultiplexer configured to buffer a data stream, and processing units connected in parallel to the buffer, wherein the processing units demultiplex the buffered packet data by parallel processing of the buffered packet data, and the demultiplexed video erase data. A video decoder that decodes the demultiplexer And an audio decoder for decoding the normalized audio data.

In addition, the broadcast receiver receives and demodulates a signal of a broadcast channel of a set frequency, examines the ID of the demodulated packet stream, filters packet data of the set broadcast channel, and generates an IP datagram. And an IP decapsulator which decapsulates IP information of the IP datagram and outputs the demultiplexer to the demultiplexer.

In addition, a method for demultiplexing packet data consisting of a packet header and a payload in a digital broadcast receiver according to an embodiment of the present invention for achieving the above object, the process of buffering the input packet data, and the buffered packet header Checking whether the payload is additional information; if the payload is additional information; processing the determined buffered additional information; and if the payload is not additional information, inspecting the payload to payload. Check whether the PES header is included, and if the PES header is included, check the size of the PES header included in the payload to determine whether the audio / video data is included, and when the audio / video data is included, the audio / video Processing the PES header after determining a buffering position of data, and after processing the PES header Alternatively, if the payload does not include the PES header, the packet data is processed by generating video / audio data by processing the video / audio data of the payload and transmitting the same to the corresponding decoder.

After checking the buffering position of the sync byte in the buffered packet data, detecting the offset value by examining the position out of the sync byte buffering position, and delaying the byte data of the packet data according to the subtraction value to synchronize the packet. It characterized in that it further comprises a synchronous search process to match. The sync search process includes checking whether the byte data stored in the buffer is a sync byte, checking a buffering position of the sync byte stored in the buffer when detecting the sync byte, and then checking the sync byte buffering position set in the buffer. Calculating a subtraction value to the buffering position of the stored sync byte byte, and delaying and buffering the input packet data according to the calculated subtraction value. The buffering position is characterized by being the first byte position of the buffer buffering the first package data.

The process of processing the packet header may include analyzing the PID of the packet header to check whether the target PID is a target PID, storing type identification information of a packet input only when the target header is a target PID, and additional information control parameters of the packet header. Analyzing and if the buffered packet includes additional information, instructing an operation of the additional information processing process and transferring buffering position information of the additional information to be processed in the additional information processing process; and adding the buffered packet If the information is not included, the operation of the PES header processing process is instructed, and the buffering position information of the PES header to be processed in the PES header processing process is characterized in that it is transmitted together.

The additional information processing step may include accessing the additional information buffered in the buffer and analyzing the length of the additional information upon receiving a driving command, and processing the additional information when the packet includes only the additional information. And transmitting the buffering position information of the PES header together with the driving command of the PES header when the packet includes the PES header in the analyzing process, and then transmitting the additional information to the controller. Characterized in that made.

The processing of the PES header may include accessing the PES header buffered in the buffer to analyze the length of the PES header when the driving command is received, and in case the buffered packet consists of only the PES header in the analysis process. Processing the header and transmitting the header to the controller; and if the buffered packet includes the actual data in the analysis, the buffering position information of the actual data is transmitted together with the driving command of the data processor. It is characterized in that it comprises a step of processing the PES header after the command to the operation and transfer the location information of the buffered real data to the control unit.

The data processing may include identifying a type of a packet according to the stored PID when the driving command is received, accessing the buffered real data, and converting the real data into a video or audio ES according to the identified PID. After the generation, it is characterized by consisting of a process of demultiplexing each corresponding decoder.

In addition, the broadcast data processing method of a mobile terminal having a digital broadcast receiver according to an embodiment of the present invention for achieving the above object is a broadcast data receiving process of receiving and demodulating the signal of the set broadcast channel to output a packet data stream; The multimedia data processing process of generating the decoded video and audio data by analyzing the packet data stream, and the process of playing the decoded video and audio data, and the process of processing the multimedia data comprises the packet data stream Buffering and inspecting the packet header and payload of the buffered packet data to process the packet data in parallel to demultiplex the video and audio esdata, and to decode the demultiplexed video and audio es data respectively. It is a special process Gong.

The broadcast data receiving process receives and demodulates a signal of a broadcast channel of a set frequency, examines the ID of the demodulated packet stream, filters packet data of a set broadcast channel, and generates an IP datagram. The process may further include decapsulating the IP information of the IP datagram, and demultiplexing the IP decapsulated packet data stream.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be noted that the same components in the figures represent the same numerals wherever possible.

In the following description, specific details such as the MPEG2-TS data structure of the digital broadcast receiver are shown to provide a more general understanding of the present invention. It will be apparent to one of ordinary skill in the art that the present invention may be readily practiced without these specific details and also by their modifications.

An embodiment of the present invention relates to a demultiplexing apparatus and method for analyzing and distributing packet data received at a digital broadcast receiver to corresponding decoders before performing a decoding operation at the digital broadcasting receiver. In this case, since the demultiplexer must analyze and distribute data in real time, the demultiplexer should be able to perform a rapid process. It is also desirable to minimize the buffer memory in the middle of performing the demultiplexing process. In the embodiment of the present invention, by arranging the processing units of the demultiplexer in parallel, the processing time can be shortened and the mounting area can be minimized by reducing the buffer size when the hardware is configured inside the chip. In an embodiment of the present invention, a configuration and method for buffering input data to a packet size, and each processor are connected to the buffer in parallel to analyze the buffered information in packet units to quickly demultiplex input data. Suggest. Also, when the synchronization of the packet data is implemented, the synchronization byte is not checked every byte, and it is determined whether the synchronization is correct, and if the synchronization is synchronized, the input TS is transmitted as it is and the synchronization position is checked only when the synchronization is not synchronized. A method and apparatus for extracting a subtraction value for synchronizing with each other and delaying the input TS data are thus achieved.

In the embodiment of the present invention, it is assumed that the TS signal input from the digital broadcast receiver is an MPEG2-TS signal. However, if the TS complies with the system standard of MPEG-4, or if the video signal included as detailed data is H.261-H.264 or MPEG-4, and the audio signal is in the MPEG-1-MPEG-4 protocol. Irrespective of one, the demultiplexing structure according to the embodiment of the present invention may be applied in the same manner.

Hereinafter, the present invention will be described in detail with reference to the drawings.

5 is a diagram illustrating a configuration of a digital broadcasting receiver. 1 illustrates a configuration including an RF tuner 310, a demodulator 320, and a multimedia processing unit 330 of the digital broadcast receiver.

Referring to FIG. 5, a digital broadcast signal may be a signal and / or L-Band in a very high frequency (VHF) region and / or an ultra high frequency (UHF) region. At this time, when the user selects a broadcast channel, the controller 300 outputs control data corresponding to the channel selected by the RF tuner 310. The RF tuner 310 generates an intermediate frequency signal of the selected channel by generating and mixing the RF frequencies according to the channel data. The intermediate frequency signal as described above is applied to the demodulator 320. Then, the demodulator 320 converts the received signal into digital data and demodulates the demodulated data according to the set demodulation method. In this case, it is assumed that the signal output from the demodulator 320 is an MPEG-2 transport stream (TS) signal, and the signal is applied to the multimedia processor 330. In the embodiment of the present invention, the RF tuner 310 and the demodulator 320 will be referred to as a broadcast receiver. The multimedia processor 330 then demultiplexes the received MPEG-2 TS signal into video, audio and broadcast information, respectively. Then, the decoders of the multimedia processor 330 decode the respective video, audio, and broadcast information. The video signal output from the multimedia processing unit 330 is output to the display unit 350 to be displayed, and the audio signal is applied to the speaker 360 to be reproduced. Also, the broadcast information of the multimedia processor 330 may be processed by the controller 300. In this case, the controller 300 receives and decodes the broadcast information and stores the same in the memory 380. Then, when a user requests to display channel information, the controller 300 accesses the broadcast information and displays it on the display 350. The broadcast information may be an electronic program guide (EPG) or an electronic service guide (ESG).

The configuration of the multimedia processor 330 in the digital broadcast receiver will be described. The multimedia processor 330 may be configured differently according to the type of the digital broadcast receiver. That is, in the case of DVB digital broadcasting, DVB_T processes data of MPEG2 TS structure, and DVB_H processes IP-based MPEG2 TS structure. Therefore, in the case of the DVB_H digital broadcast receiver, the broadcast receiver and the multimedia processing unit 330 must have a configuration capable of processing IP-based MPEG2 TS data. In the embodiment of the present invention, first, the configuration of the DVB_T digital broadcast receiver will be described, and then the configuration of the DVB_H digital broadcast receiver will be described.

6 is a diagram illustrating a configuration of the multimedia processing unit 330. 6 is a diagram showing the configuration of the multimedia processing unit 330 of the DVB_T digital broadcast receiver.

Referring to FIG. 6, the demultiplexer 410 receives demodulated MPEG-2 TS data output from the demodulator 320 and separates each data into audio and video data and broadcast information data. The broadcast information data is data excluding video and audio data included in a digital broadcast signal and may be program data of channels serviced by a broadcast. The broadcast information data may be separated from the demultiplexer 410, applied to the controller 300, processed, and stored in the memory 380. When the user requests to display broadcast information, the controller 300 may access the broadcast information data stored in the memory 380 and display the same on the display 350. In the following description, the description of the broadcast information data will be omitted. Therefore, in the following description, the broadcast signal will be limited to the video and audio signals. In this case, the control unit 300 selects and informs the broadcast information to be selected in the demultiplexer 410, that is, a service (PID: product ID), and accordingly, the demultiplexer 410 is selected from various data output from the demodulator 320 according to the selected PID. It selects the target data and separates it into video and audio.

The input buffer 420 is a general queue (a similar structure to a FIFO, which can be a kind of circular buffer in which the input and output are reversed), and the video decoder 430 and the audio decoder 450 at the back end can process demultiplexed data in real time. Save as much data as there is. The input buffer 420 may be configured as a single structure for storing video and audio data together, or may be configured as a structure for separately storing video and audio data.

The video decoder 430 and the audio decoder 450 are responsible for decoding the video data and the audio data distributed by the demultiplexer 410, respectively.

The demultiplexer 410 according to an embodiment of the present invention detects the synchronization of the input packet data as described above, buffers the input packet data, and outputs the packet data in parallel when buffering of the packet data is completed. Then, each processing unit arranged in parallel according to the embodiment of the present invention analyzes the information of the parallel output packet data and processes the corresponding information.

7 is a diagram illustrating a configuration of a demultiplexer 410 according to an embodiment of the present invention.

Referring to FIG. 7, the synchronization search unit 511 searches for a synchronization signal included in each packet data of an input TS signal, and transfers the input packet data to the buffer 513. The synchronization search unit 511 according to an embodiment of the present invention synchronizes using a subtraction delay method. The buffer 513 buffers serial data output from the synchronization searching unit 511 in packet units.

The packet header processing unit 515 searches the packet headers output in parallel in the packet data of the buffer 513 and checks whether the additional information is included. If the additional information is not included, the packet header processing unit 515 runs only the PES header processing unit 519. When the additional information is included, the additional information processing unit 517 is driven. The packet header processing unit 515 analyzes the packet header from the input packet and, if the additional information is included, transmits packet data excluding the packet header to the additional information processing unit 517. If the additional information is not included, the packet header processing unit excluding the packet header The data is transmitted to the PES header processing unit 519.

The additional information processing unit 517 is driven under the control of the packet header processing unit 515. When packet data is transmitted from the packet header processing unit 515, the additional information processing unit 517 analyzes and processes additional information included in the packet data, and PES the remaining packet data except for the additional information. The header is transferred to the header processing unit 519.

The PES header processing unit 517 extracts and processes the PES header included in the packet data transmitted from the packet header processing unit 515 or the additional information processing unit 517, and transfers the remaining packet data except for the PES header to the data processing unit 521. At this time, the PES header processing unit 517 checks the PID of the PES header (here, PID for discriminating whether audio or video data), checks whether the packet data is audio data or video data, and informs the data processor 521. The data processor 521 processes the packet data from which the PES header is removed, and transmits the divided video or audio data to an input buffer 420 of the video decoder 430 or the audio decoder 450, respectively.

As described above, the demultiplexer 410 includes four processing units 515-521, and each processing unit 515-521 sequentially analyzes packet data buffered in the buffer 513 and includes information to be processed in the packet data. Only when the packet data is received, the packet data is accessed and processed in the buffer 513. In this case, the structure of the packet data may include a packet header, additional information header, and / or PES headers. Therefore, the processing units 515-521 are driven and processed only when the header 513 includes a header to be processed by analyzing the buffered data in the buffer 513, and the data processing may be performed in parallel.

Before explaining the operation of the processing units 515-521, the structure of the input MPEG2 TS signal will be described. The MPEG2 TS signal is a packet stream as described above, and the TS signal is composed of video packets and audio packets as shown in FIG. 8A. In this case, the video and audio packets are randomly multiplexed and transmitted by the digital broadcast transmitter. In this case, the video and audio packets of FIG. 8A are composed of a packet header and payload as shown in FIG. 8B, and the packet header and payload are composed of 188 bytes. That is, one packet data is composed of 188 bytes. At this time, the packet header has a size of 4 bytes as shown in FIG. 8C, and each parameter of the packet header has a function as shown in Table 1 below.

Classification Explanation bits  sync byte  Sync byte, 0X47 8  transport error indicator  If an error occurs in the current packet: 1 One  payload start indicator  If the current packet is the beginning of a PES: 1 One  transport priority  used by decoder One  PID  Identifier that identifies the type of packet 13  scrambling control  set scrambling mode 2  adaptation field control  01: no additional information / payload only 10: additional information only / no payload 11: both additional information and payload present 00: preliminary 2  continuity counter  4 byte counter, 1 increase for same PID 4

That is, packet data starts with a sync byte, and distinguishes one packet based on this. The sync search unit 511 detects the input packet data and delays data input until a sync byte is detected. When the sync byte is detected, the sync search unit 511 buffers the packet data to be input in the buffer 513. The buffer 513 then buffers the input packet data. In this case, the buffer 513 may be a 188-byte buffer having a packet size or a buffer having a size (376 bytes (2 * 188 bytes), 564 bytes * 3 * 188 bytes) ... having an integer multiple of the packet size. . In addition, four-byte packet headers as shown in Table 1 are buffered in the first to fourth byte positions of the buffer 513.

Then, the packet header processing unit 515 processes the packet header shown in FIG. 8C and the <Table 1>. The packet header processing unit 515 compares a PID of a broadcast channel set forth by a user (hereinafter referred to as a set PID) and a PID of the packet header to determine whether to process a received packet. Control not to process packets buffered in buffer 513. If the packet buffered in the buffer 513 has the same value as the set PID, the packet header processing unit 515 analyzes the packet header to determine whether additional information (adaptation field control) is included. In this case, after analyzing the adaptation field control parameter of the packet header, the additional information processing unit if the packet does not include the additional information (that is, a packet composed of PES header and / or A / V data). The operation of 517 is omitted and the packet data stored in the buffer 513 is transferred to the PES header processor 517. When the packet does not include additional information as described above, the PES header and / or A / V data is stored in the payload region having the structure as shown in FIG. 8C. However, if the additional information is included in the packet data, the packet data structure is illustrated in FIG. 8C, and the additional information (or additional information, the PES header, and / or A / V data) may be included in the payload region. have. Then, the packet header processing unit 515 controls the additional information processing unit 517 to process payload data buffered in the buffer 513. At this time, the information transmitted to the additional information processor 517 is position information of the buffer 513 in which the additional information is buffered, and the last data of the additional information is the position information of the last byte buffered at the next byte position except 4 bytes of the packet header. Can be.

The additional information processing unit 517 is operated under the control of the packet header processing unit 515. The additional information processing unit 517 processes additional information data existing in the payload area of FIG. 8C, and the additional information data has a configuration as shown in FIGS. 9A to 9C. FIG. 9A is a diagram illustrating a structure of an additional information header. The additional information has information such as an adaptation field length, an ES priority indicator, and the like. Has flag (5 flags) parameter indicating whether field 1) is included or not. In this case, when the additional information additional field 1 is included, corresponding flags (or flags) of the 5 flag areas as shown in FIG. 9A are set, and additional information corresponding to the set flag is additional information additional field of FIG. 9A. It is included in 1 (optional field 1). Additional information included in the optional field 1 is shown in Table 2 below, and its structure may be configured as shown in FIG. 9B.

5 flags optional field 1 bits 1XXXX  PCR  42 bits X1XXX  OPCR  42 bits XX1XX  splice count down  8 bits XXX1X  transport private data length transport private data  8 bits variable XXXX1  adaptation field extension length  8 bits

Referring to FIG. 9B, the additional information additional field 1 includes additional information that can be used for other decoding, including a reference value PCR (program clock reference) of program time information. Table 2 shows the data of the additional information additional field 1 corresponding to each of the five flags, wherein two or more of the five flags may be set. For example, if the five flags are set to "10100", the additional information additional field 1 includes PCR and splice count down data.

In addition, the additional information additional field 1 as shown in FIG. 9B has flags (flags) indicating whether data of the additional information additional field 2 (optional field 2) is included. In this case, when the additional information additional field 2 is included, a corresponding flag is set in the 3 flags of FIG. 9B and the additional information is included in the additional information additional field 2 (optional field 2). The additional field 2 has the structure shown in FIG. 9C, and additional information included in the optional field 2 is shown in Table 3 below. Table 3 below shows data of the additional information additional field 2 corresponding to each of the three flags of FIG. 9B, and two or more of the three flags may be set.

3 flags  optional field 2 bits 1XX  LTW_Valid flag LTW offset  1 bit 15 bits X1X  piecewise rate  22 bits XX1  splice type  4 bits

9A to 9C are additional information for decoding the received packet data, and are included only when necessary.

Secondly, the operation of the PES header processing unit 519 will be described.

Packets remaining after the additional information is determined by the packet header processing unit 515 or after the additional information processing unit 517 is processed are controlled by the packet header processing unit 515 or the additional information processing unit 517 under the control of the PES header processing unit 519. And / or the data processing unit 521. The PES header processing unit 519 processes the PES header information as shown in FIGS. 10A to 10D. 10A is a diagram illustrating a PES header structure, in which PES scrambling control, PES priority, PES priority, copy right, original / copy, and seven flag information are illustrated. (7 flags), PES length (PES data length), etc., and PES optional field 1 is added if necessary. FIG. 10B is a structural diagram of the additional field 1 and includes presentation time stamp (PTS) / decoding time stamp (DTS). The PTS is time information for displaying the data decoded by the video decoder 430 or the audio decoder 450 on the display unit 350, and outputs the data decoded by the decoder to the display unit 350 at the time of the PTS. The DTS is time information at which the video decoder 430 or the audio decoder 450 starts decoding, and the decoder starts to decode the input packet data at the DTS time. Table 4 below shows seven flags of the PES header and corresponding data of the PES additional field 1 as shown in FIG. 10A.

7 flags  PES optional field 1 bits 0XXXXXX 1XXXXXX  PTS DTS 33 bits 33 bits X1XXXXX  ESCR 42 bits XX1XXXX  ES rate 22 bits XXX1XXX  DSM trick mode 22 bits XXXX1XX  additional copy info  8 bits XXXXX1X  previous PES CRC 16 bits XXXXXX1  PES extension Variable length

The PES optional field 1 may further have PES extension information (PES extension) as shown in FIG. 10B if necessary. FIG. 10C illustrates the configuration of the PES extension, and may further include five flags and PES optional field 2 if necessary. FIG. 10D shows the structure of the additional field 2, which is determined by five flags of PES extension information as shown in FIG. 10C. The 5 flags of FIG. 10C determine the contents of the following PES additional field 2, which is shown in Table 5 below.

5 flags PES optional field 2 bits 1XXXX  PES private data  128 bits X1XXX pack header field 8 bits XX1XX program packet seq. cntr. 8 bits XXX1X PES extension field length 16 bits XXXX1 PES extension field data 7 bits

The PES header processing unit 517 processes the PES header having the configuration as shown in FIGS. 10A to 10D, and transfers position information of A / V data except for the PES header to the data processing unit 521. In this case, the A / V data transmitted to the data processor 521 is pure data (ES) in which all header information included in the packet data is removed, and the data processor 521 transmits the transferred A / V data to video or audio. Function to distribute by ES signal.

As described above, the demultiplexer 410 according to the embodiment of the present invention buffers and outputs the TS signals inputted by the buffer 513 in a packet size, and outputs the respective processing units 515-521 to the buffer 513 in parallel as shown in FIG. 7. By arranging and analyzing the information of the packets in parallel, the demultiplexing operation can be processed quickly. In addition, the synchronization search unit 211 of the demultiplexer 410 of the present invention does not search every byte when searching for synchronization of received packet data, but checks the delay value of the sync byte at the time when the sync byte is confirmed, and then confirms the delay. By delaying the data input to the buffer 513 by the value, the synchronous search can be simplified by not searching every byte of the input packet.

The operation of the demultiplexer 410 according to the embodiment of the present invention as shown in FIG. 7 will be described in detail with reference to the packet data of FIGS. 8A to 10D.

11 is a diagram showing the configuration of the synchronization searching unit 511 of the demultiplexer 410 according to the embodiment of the present invention. The sync search method proposed in the MPEG standard should check whether every byte of the packet data input as described in FIG. 4 is a sync byte (0X47). According to an exemplary embodiment of the present invention, an input TS signal is stored in the buffer 513 in a packet size, and the byte data stored in the buffer 513 is inspected. When the byte data is a sync byte, the sync detection unit 511 synchronizes the buffer 513. Packet synchronization is detected by detecting a position value out of the byte position. That is, when the sync byte is confirmed, the sync search unit 511 detects the position value of the buffer 513 in which the sync byte identified at a specific position (here, the first byte position) is stored in the buffer 513. After calculating the subtraction value up to the set synchronization byte buffering position, a method of synchronizing by delaying the bytes of the TS signal input by the calculated subtraction value is used.

Referring to FIG. 11, the input packet data is stored in the buffer 513. The buffer 513 is a buffer for storing packet data and may have a size of 188 bytes, and stores byte data of an input packet in the order of input. In this case, the subtraction value extractor 615 checks the position information of the byte data buffered in the buffer 513. The synchronization confirmation unit 613 confirms whether the byte data stored in the buffer 513 is a synchronization byte, and when the synchronization byte is confirmed, the synchronization confirmation unit 613 notifies the subtraction value extraction unit 615 of this. Then, the subtraction value extracting unit 615 checks the buffering position of the current byte (here, the sync byte) of the buffer 513 when a signal for identifying a sync byte is input from the sync check unit 613. Thereafter, the subtraction value extractor 615 calculates a subtraction value from the position of the buffer 513 in which the byte data identified as the synchronization byte is stored to the synchronization byte buffering position set in the buffer 513, and then delays the calculated subtraction value. Output to unit 611. Then, the delay unit 611 delays the input TS signal according to the calculated subtraction value, delays the TS signal input by the subtraction value, and then transfers the subsequent TS signal to the buffer 513. At this time, the buffer 513 stops storing the TS signal by the subtraction value output from the subtraction value extracting unit 615, and when the subtraction value ends, buffers the TS signal transmitted from the delay unit 611. Accordingly, the sync search unit 511 normally transfers the input TS signal to the buffer 513. At this time, the transmitted TS signal becomes data starting from the sync byte of the packet.

Once the packet is synchronized as described above, each packet of the TS signal inputted thereafter is in a synchronized state, and the synchronized state is maintained unless a special obstacle occurs. If the packet synchronization is out of order due to the fault condition or the like, packet synchronization is achieved while performing the above operation again. As described above, the sync retrieval unit 511 checks the position of the sync byte of each packet in the input TS signal, calculates a subtraction value according to the position of the sync byte, and then calculates the subtraction value. A method of implementing synchronization by delaying input packet data is used.

12 is a flowchart showing an operation procedure of the synchronization searching unit 511. FIG.

Referring to FIG. 12, the TS signal is a packet stream, and one packet consists of 188 bytes. Accordingly, the TS signal is sequentially input to the buffer 513 and is input through the byte bus in byte units. Accordingly, when the TS signal is input in step 631, the sync search unit 511 confirms whether the input byte data is sync byte data, and stores the same in the buffer 513 in step 641. In this case, the buffer 513 sequentially stores the input byte data. When the sync byte is input, the sync search unit 511 detects it in step 633, and checks the location of the buffer 513 in which the sync byte is stored in step 635, and in step 637, the checked position and the preset sync byte. After comparing the positions of the signals and determining the subtraction position values, in step 639, the data input stored in the buffer 513 is delayed to synchronize the packets.

For example, the first packet data may be input without packet synchronization. Then, the synchronization retrieval unit 511 stores the byte data of the input packet in the buffer 513 as it is. It is then checked whether the byte data stored in the buffer 513 is synchronous data. At this time, if the sync byte is confirmed, the location of the buffer 513 in which the sync byte is stored is checked. Thereafter, the synchronization searching unit 511 determines a subtraction value of the synchronization byte for the packet synchronization. In this case, it is assumed that the setting position of the sync byte is the first byte position of the buffer 513. If the position at which the current sync byte is confirmed is the 180th byte position, the subtraction value is -8. Then, the synchronization retrieval unit 511 achieves packet synchronization by delaying the input packet data by 8 bytes to the buffer 513. In this case, the 8 baht is lost, and then packet synchronization is achieved. Therefore, the synchronization search unit 511 can achieve synchronization in the next packet period when the packet synchronization is incorrect.

Once packet synchronization is established as above, the packet synchronization is maintained as long as no abnormality on the radio link occurs. Accordingly, the synchronization search unit 511 maintains the deduction value as 0 when the packet synchronization is performed. Therefore, the synchronization search unit 511 controls the buffer data to be buffered in the buffer 513 in units of packets. Therefore, the synchronization search unit 511 according to an embodiment of the present invention only checks the synchronization of the first byte of the packet synchronized by the subtraction value of the synchronization byte in the packet interval, not a method of searching for the synchronization byte for every byte of the input packet. It can be seen that the packet synchronization is achieved. At this time, the packet header processing unit 515 checks whether the first byte is a synchronization byte during packet header processing, and if not, the packet header processing unit 515 may notify the synchronization search unit 511 that the synchronization is out of sync. Then, the synchronization searching unit 511 may synchronize the input packet while performing the above operation.

13A to 13C are diagrams showing the configuration of the buffer 513 according to the embodiment of the present invention. 13A illustrates a structure in which an input TS signal is buffered to a packet size and outputs buffered packet data in parallel. In this case, the processing units 515-521 may simultaneously access 188 bytes of bytes output in parallel from the buffer 513. In this case, the processing units 515-521 may simultaneously access the buffered data of the set buffer 513. FIG. 13B shows an example of implementing buffer 513 using two buffers 675 and 677. FIG. When the buffer 513 is implemented as shown in FIG. 13B, the processor 515-521 accesses and processes the data buffered in the buffer 677 when buffering the TS packet input to the buffer 675, and then processes the input TS packet in the buffer 677. When buffering the data, the processor 515-521 accesses and processes the packet buffered in the buffer 675. FIG. 13C illustrates an example in which the memory of the buffer 513 is implemented as a dual port memory 683. In this case, the memory 683 may independently implement an operation of buffering input TS packets and an operation of accessing the buffered packets by the processing units 515-521.

First, referring to FIG. 13A, the buffer input unit 651 distributes the input packet data to the buffers 661-66N in byte units and performs input. The buffer input unit 651 may include a counter and a multiplexer. In this case, the count value output from the counter of the buffer input unit 651 may be used as data for selecting the buffers 661-66N, and the multiplexer stores byte data of the input packet to the corresponding buffers 661-66N by the count value. You can execute the function of printing. In this case, the buffers 661-66N should be provided as a number capable of buffering 1 packet of 188 bytes of data, and thus, N may be 188. Accordingly, the counter of the buffer input unit 651 may be a 188-degree counter, and the multiplexer may have a configuration capable of multiplexing byte data of the input packet into the 188 buffers 661-66N. The count value of the buffer input unit 651 may be applied to the subtraction value extractor 615 of the sync search unit 511 as a position value of a sync byte, and the packet data input to the multiplexer may be used as an input of the sync check unit 613. have. The signal output from the input delay unit 611 may be used as a count reset value of the counter of the buffer input unit 651.

As described above, the buffer input unit 651 multiplexes the byte data of the input packet and inputs them to the corresponding buffers 661-66N, and the buffers 661-66N temporarily buffer the input byte data. The buffer output unit 653 then parallel buffers the data buffered in the buffers 661-66N. Then, when the buffered data becomes 188 byte data of one packet, the buffer output unit 653 outputs the data of one packet being buffered in parallel to the packet buffer 655. In this case, the output control signal of the buffer output unit 653 may use the count end signal of the counter of the buffer input unit 651. Then, the packet buffer 655 buffers one packet of parallel data output from the buffer output unit 653. At this time, the buffer input unit 651 starts to buffer byte data of the next packet in the buffer 661-66N. Accordingly, a difference between one packet may occur between the packet buffered in the buffers 661-66N and the packet buffered in the packet buffer 655. Then, the processing units 515-521 can process the packet data buffered in the packet buffer 655 while buffering the packets input from the buffers 661-66N. The processing units 515 to 521 using the buffer 513 as shown in FIG. 13A can simultaneously access the buffering data of one packet output in parallel and process them in parallel.

Secondly, referring to FIG. 13B, the buffer memory 673 may store two packets. For this purpose, the buffer memory 673 may be configured of a first buffer 675 and a second buffer 677. The processor 515-521 accesses and processes the packet buffered in the second buffer 677 while buffering the input packet in the first buffer 675, and then buffers the input packet in the second buffer 677. The processor 515-521 accesses and processes the packet buffered in the first buffer 675. In this case, the first buffer 675 and the second buffer 677 are configured to independently use data input and data output, and the data input line is connected to the synchronization search unit 511 and the data output line is the processor 515-. It is configured to be connected to the 517 side.

The address generator 671 for generating an address and a control signal for buffering or outputting data to the buffers 675 and 677 may be implemented as a counter, and the read / write terminal may use the MSB output of the counter. The count clock of the address generator 671 uses the byte clock of the input TS signal. Therefore, the address generator 671 performs a function of generating an address signal for storing the byte data output from the sync search unit 511 in the buffer memory 673. In this case, the address generator 671 has an output of 9 bits, the lower 8 bit lines generate an output of a 188 binary counter, and the upper 9 bit (MSB) line is used as a read / write control signal of the buffers 675 and 677. In this case, the address generator 671 is designed such that the MSB line remains low while operating as the first 188 binary counter and the MSB line remains high while operating as the second 188 binary counter. Then, while odd numbered packets of the TS signal are buffered in the first buffer 675, even numbered packets buffered in the second buffer 677 are accessed to the processing unit 515-521, and even numbered packets are transmitted to the second buffer 677. During buffering, even-numbered packets buffered in the first buffer 675 are accessed by the processing units 515-521.

The lower 8-bit line output from the address generator 671 is connected to the subtraction value extractor 615 of the sync search unit 611. The output of the subtraction value extractor 616 is input as a reset signal of the address generator 671. Then, the subtraction value generation unit 615 inputs the address value of the address generation unit 671. When the synchronization confirmation unit 613 confirms the input of the synchronization byte, the address value at this time is the location information stored in the buffer memory 673. it means. Subsequently, the subtraction value extractor 616 calculates a position value at which the sync byte is to be buffered at the current buffering position where the sync byte is stored, and then operates the delay unit 611 and the address generator 671 by the calculated subtraction value. Stop. The address generator 671 then stops addressing the buffer memory 673.

13B includes a buffer memory having two packet sizes, and outputs a buffered packet to another buffer memory while one buffer memory buffers an input packet to control the processing unit 515-521 to process the same. . At this time, the write and read addressing operations of the buffer memory are performed at the same speed.

Thirdly, referring to FIG. 13C, the buffer memory 683 may be a dual port memory. When the dual port memory is used as the buffer memory 683, the first address generator 681 and the second address generator 685 may generate addresses having different speeds. That is, the first address generator 681 performs addressing at a speed capable of storing the input byte data, and the second address generator 685 performs addressing at a speed that can be processed by the processing units 515-521. can do. At this time, the addressing start time of the second address generating part 685 should match the address start time of the first address generating part 681. This is because the output time of the buffered packet must also be matched with the buffering time of one packet in the buffer memory 683. Accordingly, a clock having a different speed may be used as a count clock for addressing the first address generator 681 and the second address generator 685, and the count reset operation of the second address generator 685 may generate the first address. It is configured to be performed by section 681. The operations of the first address generator 681 and the synchronization search unit 511 may be implemented in the same manner as the address generator 671 of FIG. 13B.

As described above, in the state where the buffer 513 is buffering the packet data in parallel, the processing units 515-521 analyze the packet data by analyzing corresponding header information in the buffered packet data, and then process the audio ES or the video ES. Extract and demultiplex the audio decoder 450 or the video decoder 430. At this time, the header information processed by each processing unit 515-521 is transmitted to the control unit 300 and used as control information for digital broadcast processing.

To this end, in the embodiment of the present invention, the packet header processing unit 515 analyzes the packet header in the packet buffered in the buffer 513 and checks whether the additional information is included. If the packet does not include the additional information, the packet header processing unit 515 processes the packet to the PES header processing unit 519. In this case, the position information of the buffer 513 to be processed by the PES header processing unit 519 is also transmitted. That is, the packet header processing unit 515 generates a command to process 188 bytes of the 5th-188th bytes of the buffer 513 except 4 bytes of the packet header. In addition, if the data buffered in the buffer 513 is a packet including only additional information, the packet header processing unit 515 requests the additional information processing unit 517 to process 188 bytes of the fifth to 188th bytes of the buffer 513 excluding the packet header 4 bytes. Issue the command. If the data buffered in the buffer 513 is a packet including only additional information, the packet header processing unit 515 informs the additional information processing unit 517 of the additional information and the additional information to the additional information processing unit 517 together with a command for notifying that the packet includes the PES header. Issue a command to process. In this case, the packet header processing unit 515 may instruct the PES header processing unit 519 to prepare to process the PES header. Then, the additional information processor 517 checks the additional information included in the packet and the length of the PES header, and then transmits the PES header length to the packet header processor 515 or PES header processor 519. When the PES header processing unit 519 receives a processing command from the packet header processing unit 515 or the additional information processing unit 517, the PES header processing unit analyzes the PES header with the data buffered at the position of the buffer 513 to be delivered, and the actual data is buffered according to the analysis result. The information is transmitted to the data processing unit 521, and the PES header is processed. The data processor 521 generates the buffering data of the position transmitted from the PES header processor 519 as audio or video ES data according to the PID information transmitted from the controller 300, and demultiplexes the corresponding video decoder 430 or the audio decoder 450, respectively. To print.

In addition, the control unit 300 may analyze and process the packet header, additional information header, and PES headers. That is, after the controller 300 analyzes the header information (packet header, additional information header, PES header) of the packet, the packet stored in the buffer 513 while controlling the processing units 515-521 in parallel according to the analysis result of the header information. You can also process the data in parallel.

First, the operation of the packet header processing unit 515 will be described. 14A and 14B are flowcharts illustrating a procedure of analyzing and processing a packet header buffered by the packet header processing unit 515. 14A illustrates a procedure in which the additional information processing unit 517 transfers a processing instruction to the PES header processing unit 519 when both the additional information and the PES header are included in one packet, and FIG. 14B illustrates that the packet header processing unit 515 transmits the PES header. The procedure for transferring the processing instruction to the header processing unit 519 is shown.

Referring to FIG. 14A, the packet header is composed of 4 bytes as shown in FIG. 8C, and is buffered in the first-4 byte region of the buffer 513. The packet header includes a product identifier (PID). Here, the PID is used as information for identifying a subsequent packet in a network information table (hereinafter referred to as NIT), a service information table (service information table 0, and audio or video information of a broadcast channel). A frequency channel information table of a digital broadcasting station, and a SIT is a broadcasting channel table serviced in a frequency channel, so when the user selects an arbitrary digital broadcasting channel, the controller 300 first receives the NIT and uses the frequency of the selected broadcasting channel. After confirming the channel, the RF tuner 310 is fixed to fix the RF channel at the frequency of the selected broadcast channel, and in the digital broadcast, a plurality of broadcast channels are serviced in one frequency channel, and typically one frequency channel is provided. Five stations will be used. Information for distinguishing audio and video ESs of a plurality of broadcasting stations using RF channels is included in the SIT, and the controller 300 determines the audio and video PID of a broadcasting channel desired by a user with reference to the SIT. The demultiplexer 410 searches for the PIDs of the received packets and demultiplexes the inputted packets only in the case of the determined PID.

Accordingly, when the packet is buffered in the buffer 513, the packet header processing unit 515 analyzes the PID of the buffered packet header in step 701 and determines that the packet is a PID for identifying that the packet is NIT. The packet data of the fifth to 188th bytes buffered in the buffer 513 is transmitted to the controller 300. Then, after analyzing the NIT, the controller 300 controls the RF tuner 310 to fix the frequency channel of the selected broadcasting station. When the PID for SIT identification is received, the packet header processing unit 515 detects this in step 707 and delivers the packets buffered in the buffer 513 to the control unit 300 in step 708. Subsequently, audio and video identification PIDs of the selected broadcasting station transmitted from the control unit 300 are received and determined as target PIDs. Thereafter, the packet header processing unit 515 analyzes the set target PIDs to demultiplex packets of a broadcast station.

As described above and when the target PID is determined, the packet header processing unit 515 checks whether the packet header PID is a set PID when a packet is input. If the PID of the buffered packet is not the set PID, the packet header processing unit 515 detects this in step 711 and does not perform the demultiplexing procedure of the input packet. However, if the PID included in the input packet header is a set PID, it is detected in step 711 and the packet header is analyzed in step 713. The packet header as shown in FIG. 8C has additional information control parameters indicating whether PID information and additional information are included for identifying packet data, and also whether an error of a current packet, a start of a PES, a priority, a scrambling Contains count data for the mode and the same PID. And an additional field control parameter indicating whether additional information to be processed by the additional information processor 517 is displayed. The packet header processing unit 515 analyzes the additional information control parameter in the packet header to determine whether to operate the additional information processing unit 517. The packet header processing unit 515 analyzes the additional information control parameter in the packet header having the structure shown in FIG. 8C and Table 1 and checks whether the packet includes the additional information.

As shown in <Table 1>, the additional information parameter is composed of 2 bits. If "01" indicates that the input packet is composed of pure payload without additional information, and "10" indicates that the input packet is additional information only. "11" indicates that additional information and payload are included together. Accordingly, after the packet header processing unit 515 analyzes the additional information control parameter, if the packet does not include additional information (adaptation field control: " 01 "), the packet header processing unit 515 detects this in step 715 and in step 717. The PES header processing unit 519 is instructed to process the remaining packets (184 bytes) except the 4 packet headers. In step 719, the packet header processing unit 515 processes the packet header and transmits information related to broadcasting to the control unit 300. In this case, the additional information processing unit 517 does not operate.

In addition, if the input packet is a packet including only additional information (adaptation field control: “10”), the packet header processing unit 515 detects it in step 721 and the remaining information except for the packet header 4 bytes in the additional information processor 517 in step 723. Instructs processing of packet (184 bytes). In step 719, the packet header processing unit 515 processes the packet header and transmits information related to broadcasting to the control unit 300. In this case, the PES header processor 519 and the data processor 521 are not operated.

However, if the input packet is a packet including both additional information and payload (adaptation field control: “11”), the packet header processing unit 515 detects this in step 721 and operates in the additional information processing unit 517 in step 725. Issue a command. In step 719, the packet header is processed and the result is transmitted to the controller 300. In this case, the packet header processing unit 515 may generate an operation command to the PES header processing unit 519 in step 725. In this case, the additional information processor 517 may transmit an operation command together with location information for accessing the data buffered in the buffer 513, and only the operation command may be generated in the PES header processor 519. Then, the PES header processing unit 519 prepares to process the PES header buffered in the buffer 513, and the processing of the PES header may start after receiving the start position information of the PES header from the additional information processing unit 517.

As described above, the packet header processing unit 515 analyzes the PID of the packet header of the received packet, transfers the NIT and SIT packets to the controller 300, and sets the packet PID to receive and receive the video and audio PIDs of the broadcasting station set from the controller 300. do. Thereafter, if the buffered packet is a set target PID, the packet header is analyzed, and if the additional information packet is an instruction to drive the additional information processing unit 517, and if the PES header packet is commanded to drive the PES header processing unit 519, wherein each processing unit 517 And location information of a buffer to be processed by accessing the data. When the buffered packet includes both the additional information and the PES header, the additional information processing unit 517 is instructed to drive and the start position information of the buffered additional information is transmitted to the buffer 513. The additional information processor 517 analyzes the additional information and informs the PES header processor 519 of the PES header buffering position of the buffer 513.

However, if the packet includes both the additional information and the PES header, the packet header processing unit 515 may deliver the location information buffered by the PES header to the PES header processing unit 519. 14B is a flowchart illustrating a method in which the packet header processing unit 515 delivers the position information of the PES header buffered in the buffer 513 to the PES header processing unit 519.

Referring to FIG. 14B, the operation of step 710 is the same as the operation of steps 701-709 of FIG. 14A. The operations of steps 711 to 723 are also performed in the same manner as the operation of FIG. 14A. In this case, when the buffered packet includes the additional information and the PES header, the packet header processing unit 515 detects this in step 721 and instructs the driving of the additional information processing unit 517 in step 725. (N bytes: N can be confirmed by the adaptation field length of the additional information header), and in step 733, receives the length of the additional information transferred from the additional information processing unit 517. In step 735, the buffer is received. After determining the buffering position of the PES header buffered at 513, the sub information processor 517 is instructed to process N bytes of data, and the PES header processor 519 is instructed to process 184-N bytes of data.

As described above, when the packet data is buffered, the packet header processing unit 515 analyzes the packet header and analyzes an additional information control parameter included in the packet header to instruct driving of the corresponding processing units. At this time, if the input packet is composed only of pure payload, the packet header processor 515 drives the PES header processor 519 to process the buffered packet in the buffer 513. In this case, the additional information processing unit 517 is not driven, and thus, the demultiplexer 410 having a serial structure can shorten the time for buffering a packet to the additional information processing unit 517 and the processing time in the additional information processing unit 517.

Secondly, when the input packet includes only additional information, the packet header processing unit 515 instructs the additional information processing unit 517 to process the buffered packet in the buffer 513. In this case, the PES header processing unit 519 and the data processing unit 521 are not driven, and thus, the demultiplexer 410 having a serial structure can shorten the time for buffering the packet to the PES header processing unit and the data processing unit 521 and the processing time in each processing unit. Can be.

Third, when the input packet includes both the additional information and the payload, the packet header processing unit 515 checks the length of the additional information included in the packet from the additional information processing unit 517 to determine the additional information and the payload size. After determining the, the additional information processing unit 517 and the PES header processing unit 519 instruct to process corresponding additional information and payloads among the packets buffered in the buffer 513. According to an embodiment of the present invention, when the additional information and the payload are included in one packet, the packet header processing unit 515 checks the length of the additional information included in the packet in the additional information processing unit 517, and accordingly, the packet It has been described that the header processing unit 515 determines the size of packet data to be processed by the additional information processing unit 517 and the PES header processing unit 519, respectively. However, when the packet includes both the additional information and the payload as described above, after the additional information processing unit 517 checks the length of the additional information in the additional information header, the remaining packet data except for the additional information in the PES header processing unit 519. You can also implement it by telling it to process them.

When the input packet includes both the additional information and the payload, the additional information processing unit 517 and the PES header processing unit 519 may simultaneously process packet data having a set size, and thus have a serial structure. The demultiplexer 410 may shorten the time for buffering the packets and the time for processing the packets serially in the respective processing units.

The additional information processing unit 517 processes the additional information of the packet and is operated by a command of the packet header processing unit 515 and includes data of the fifth to 188th byte areas except for the packet header area of the buffer 513 or some areas of these areas. The data of is inputted. The additional information processing unit 517 checks an identifier (flag) for determining the presence or absence of detailed information of the additional information header as shown in FIGS. 9A to 9C, and analyzes and stores additional information accordingly. The stored information may be a reference value PCR (program clock reference) of program time information. In addition, the additional information may be connected to the control unit 300 and / or the decoders 430 and 450 and transmitted. 15 is a flowchart illustrating the operation of the additional information processing unit 517 according to the embodiment of the present invention.

Referring to FIG. 15, in step 741, the additional information processor 517 receives buffering position information of a driving command and additional information transmitted from the packet header processor 515. In this case, the method of transmitting the additional information processing command by the packet header processing unit 515 is determined by the additional information control parameter of the packet header as described above. In this case, when all of the buffered packets are additional information, the packet header processing unit 515 instructs to process all areas of the buffer 513. Then, the additional information processing unit 517 determines all of the packets buffered in the buffer 513 as additional information and processes the same as in FIG. 15.

Secondly, when both the additional information and the PES header data are included in the buffered packet, the packet header processing unit 515 is the first of the buffer 513 in which the additional information is stored together with a processing instruction of the additional information in the additional information processing unit 517. Pass location information together. Then, the additional information processor 517 accesses the buffered additional information to check the length of the additional information, checks the position of the buffer 513 in which the PES header information is stored, transfers it to the PES header processor 519, and simultaneously generates a driving command. do. Further, when the packet header processing unit 515 requests confirmation of the additional information length, the additional information processing unit 517 reads the value of an adaptation field length parameter of the additional information header as shown in FIG. 9B from the additional information processing unit 517. The packet header information is sent to the packet header information processing unit 515. Then, the packet header processing unit 515 notifies the additional information processing unit 517 and the PES header processing unit 519 of the additional information and the buffering position information of the payload, respectively, and instructs an operation. In the following description, when the packet includes both the additional information and the PES header data, the additional information processor 517 transfers the buffering position and the operation command of the PES header data to the PES header processor 519.

Therefore, when the additional information processing unit 517 receives the additional information processing command from the packet header processing unit 515, the buffered packet is a packet including only additional information or the packet including the PES header data according to the location information of the additional information. It can be seen. In this case, if the packet includes only the additional information, the additional information processing unit 517 detects it in step 743 and proceeds to step 751. If the packet includes the additional information and the PES header, the additional information processing unit 517 may buffer the additional information length buffered in the fifth region of the buffer 513 in the additional information structure shown in FIG. 9A in step 745. length is analyzed to determine the length of the additional information included in the packet (assuming that the length of the additional information is N). In step 747, the additional information processor 517 calculates length and position information of the PES header buffered in the buffer 513. In this case, the packet is 188 bytes, which is 184 bytes except for the packet header. Therefore, since the additional information stored in the buffer 513 is from the fifth byte position to N bytes, the position of the buffer 513 in which the PES header data is buffered is from the 188-N byte (M byte) position to the 188th byte position. In step 749, the additional information processor 517 delivers the calculated buffering position data of the PES header data together with the driving command to the PES header processor 519.

In step 751, the additional information processor 517 processes the basic field data of the additional information as shown in FIG. 9A. In step 753, the additional information processing unit 517 checks whether additional information additional field 1 has been added by checking flags of additional header data as shown in FIG. 9A. That is, the additional information processing unit 517 determines whether the additional information additional field 1 (optional field 1) is included by checking five flags (“5 flags”) of the additional information header as shown in FIG. 9A. The 5 flag ("5 flags") has a structure as shown in Table 2, and if the flags of the 5 flag is set, the additional flag (optional field 1) area of FIG. Additional information field 1 (optional field 1) such as the data exists. In step 755, the additional information processing unit 517 processes additional information additional field 1 data as shown in FIG. 9B. In step 757, the additional information processing unit 517 checks and adds a 3 flag region of FIG. 9B. Checks for the inclusion of optional field 2. In this case, if a flag value exists in the 3 flag ("3 flags") as shown in Table 3, the additional information additional field 2 as shown in FIG. 9C is displayed in the additional information additional field 2 area as shown in FIG. 9B. (optional field 2) Data exists. In step 759, the additional information processor 517 processes the additional information additional field 2 data shown in FIG. 9C. However, in step 753 or 757, if there is no flag value in 5 flags ("5 flags") or 3 flags ("3 flags"), the additional information processing unit 517 confirms that there are no additional fields of additional information and returns. do.

As described above, the additional information processing unit 517 processes the basic field data of the additional information as shown in FIG. 9A and checks whether there is additional information added to the optional field 1, which is " 5 " It is determined by reading the "flag" value. In this case, when a flag value exists in the "5 flag", the flag values are present in the "additional information addition field 1" of FIG. 9A as shown in FIG. 9B, and the additional information processing unit 517 is the "additional information as shown in FIG. 9B. Process additional field 1 ". Thereafter, the additional information processor 517 checks whether there is an additional information additional field 2 (optional field 2) in the additional information as shown in FIG. 9B, which is determined by reading the "3 flag" value of FIG. 9B. In this case, when the flag value exists in the "3 flag", the flag values are present in the "additional information addition field 2" of FIG. 9B as shown in FIG. 9C, and the additional information processing unit 517 is the "additional information as shown in FIG. 9C. Process additional field 2 ".

In addition, when the packet is PES header data or the packet includes additional information and PES header data, the PES header processing unit 519 is operated. In this case, the operation is performed under the control of the packet header processing unit 515 or the additional information processing unit 517, and the packet header processing unit 515 or the additional information processing unit 517 also transfers buffering position information of the PES header data stored in the buffer 513. In this case, when the additional information and the payload data are present in the packet, the PES header processing unit 519 accesses the PES header data after all of the additional information is accessed by the additional information processing unit 517. In this case, the packet header processing unit 515 and the additional information processing unit 519 may not know whether the packet includes only the PES header or the PES header and the actual data ES. Accordingly, the packet header processing unit 515 and the additional information processing unit 517 regard the buffered packet as a PES header once, and the PES header processing unit 519 analyzes the buffered PES header data to confirm the PES header length, and then the PES header. The length and position of the other actual data are determined, and the buffering position data of the determined actual data ES is transmitted to the data processor 521. Additional field data of the PES header are transmitted once per frame in case of video data, and once in set frames in case of audio data. Therefore, most packets contain only basic field data of PES header.

16 is a flowchart illustrating a procedure of processing PES header data in the PES header processing unit 519. FIG.

Referring to FIG. 16, in step 771, the PES header processing unit 519 receives buffering position information of the PES header data together with a driving command from the packet header processing unit 515 or the additional information processing unit 517. The PES header processing unit 517 stores data of the 5 th-188 th byte buffer area except the packet header area from the packets buffered in the buffer 513 or data of the 188-N th-188 th byte area set by the packet header processing unit 515. Analyze At this time, the PES header processing unit 519 identifies “10”, which means the start of the PES header having the structure as shown in FIG. 10A, and analyzes the length of the PES header data by analyzing PES header data length. The PES data length (PES header data length) can be found at the third byte position from the buffering start position of the PES header data. Then, if the position value of the delivered PES header is greater than the length of the checked PES header data, the PES header processor 519 detects that the actual data ES exists in step 775, and excludes the length of the PES header data in step 777. The remaining buffering data is determined as the actual data ES, and the buffering position information of the actual data ES is transmitted to the data processor 521 together with the driving command. That is, the PES header data may consist of only actual header data and may also include actual data ESs. And most packets will contain the actual data ESs. Accordingly, the PES header processor 519 transfers buffering position information of the actual data ES except for the PES header data from the packet buffered in the buffer 513 to the data processor 521 for processing by the data processor 521.

After the actual data ES does not exist in the buffered packet in step 775 or after performing step 777, the PES header processing unit 519 analyzes and processes the PES information through the basic field flags of the PES header as shown in FIG. 10A. do. The basic field of the PES header includes broadcast information, and the processed broadcast information is transmitted to the controller 300. After processing the basic field data of the PES header, the PES header processing unit 519 checks the flags (7 flags) of the basic field as shown in FIG. 10A in step 781 to check whether the additional field 1 of the PES header exists. The seven flags have the function as shown in Table 4. If any flags are set among the seven flags, the PES header processing unit 519 determines that the additional field 1 of the PES header is set in step 781. In step 783, the controller detects the presence, processes the optional optional field 1 shown in FIG. 10B, and transmits the result to the controller 300. In step 785, the PES header processing unit 519 checks 5 flags of the PES extension field (PES extension) as shown in FIG. 10C to check whether an additional field 2 of the PES header exists. In this case, if any of the five flags as shown in Table 5 are set, the PES header processing unit 519 detects the presence of the PES optional field 2 in step 785 and the process shown in FIG. After processing the data of the same PES header additional field 2, the result is transmitted to the controller 300. However, if it is determined in step 781 or step 785 that there are no additional fields of the PES header, the PES header processing unit 519 terminates the PES header processing and returns.

As described above, the PES header processing unit 519 first checks the PES header length M included in the packet by checking the length of the PES header of FIG. 10A and then delivered from the packet header processing unit 515. The M length data is determined as a PES header in 184-N of the buffer 513. The data processor 521 is then instructed to process 184-N-M length data of the buffer 513. In this case, N is the length of the additional information. When the packet is composed of only the PES header and the actual data ES, the additional information length is zero. The PES header processing unit 519 processes the basic fields of the PES header as shown in FIG. 10A in the same manner as the additional information processing unit 517 processes the additional information, and checks and sets the "7 flag" area of the basic fields. If the present flag exists, the PES header additional field 1 as shown in FIG. 10B is processed. The PES additional field 1 includes a PES header extension field (PES extension), and the PES header extension field has a configuration as shown in FIG. 10C. Therefore, the PES header processing unit 519 processing the PES header additional field 1 checks the " 5 flag " area of FIG. 10C, and if there is a flag set, processes the PES header additional field 2 as shown in FIG. 10D.

As described above, the PES header processing unit 519 processes the PES header shown in FIGS. 10A to 10D. The operation of the data processor 521 is controlled by the PES header processor 519. After confirming whether a packet currently input from the controller 300 is video or audio data, the data processor 521 makes the data buffered in the buffer 513 into a video ES or an audio ES. The video decoder 430 or the audio decoder 450 passes. That is, when the packet is buffered in the buffer 513, the packet header processing unit 515 analyzes the PID of the buffered packet header, checks whether the packet input to the controller 300 is video or audio, and transmits the packet to the controller 300. Then, the controller 300 notifies the data processor 521 that it is a video or audio packet so that the input packet can be identified. Although the control unit 300 is described as transferring the packet identification information to the data processing unit 521, the packet header processing unit 515 may analyze the packet header and then transfer the packet identification information to the data processing unit 521. In this case, the packet header processing unit 515 is in a state of knowing the video and audio PID of the channel set as described above. Therefore, if the packet header processing unit 515 includes the video or audio PID set by analyzing the PID included in the packet header, the data processing unit 521 is determined. You can tell it.

At this time, the basic field of the PES header as shown in FIG. 10A is included in every packet, and if the additional field is not included, the basic field of the PES header is 3 bytes. Therefore, the actual data ES included in the packet may be up to 181 bytes (byte data except for 4 bytes of packet headers and 3 bytes of PES headers), so that the data processor 521 is the 8th-188th of the buffer 513 at most. Data in the byte area can be input, and the PES header processor 519 checks the remaining elementary stream (ES) and outputs it to the video or audio ES. In other words, the data processing unit 521 processes the remaining packet data (one packet data (188 bytes)-packet header (4 bytes)-additional information (N bytes)-PES header (M bytes)) processed by the processing units 515-517. And parses it into a video or audio ES according to the PID value included in the packet header. In this case, N and M are determined according to the adaptation field length of FIG. 9A and the PES header data length of FIG. 10A, respectively, wherein the additional information length and / or the PES header length are 0. (N = M = 0, N = 0, M = 0). Further, when the additional information length and / or PES header length is not 0 (N = M = 0, N = 0, M = 0), the data processing unit 521 is the additional information processing unit 517 and / or PES header processing unit. Since real data is processed at the same time as 519, demultiplexing of packet data can be performed quickly.

In general, the packets of the input TS signal do not include additional fields of the side information and the PES header. That is, the packet data will include the additional information and / or PES header only when necessary. Accordingly, the received packet is mainly composed of actual data (ES). In this case, only the packet header processing unit 515, the PES header processing unit 517, and the data processing unit 521 operate, and the additional information processing unit 517 does not operate. Also, the PES header processing unit 517 processes only basic field data of the PES header. Therefore, when demultiplexing a packet received by the demultiplexer 410 to the decoders 430 and 450, the actual data ES may be demultiplexed to signal.

Table 6 below shows an example of a configuration ratio between the PES header and the data packet included in the packet data. As shown in Table 6 below, the PES header packet or the side information packet has a very small number of packets compared to the data packet.

 Total packets  55,476 packets PID Audio PID    0X0259 Video PID    0X0258 PES packet  Total PES packets   104 packets Audio PES    18 packets Video PES    86 packets

Therefore, when the packet is input, the buffer is sequentially buffered in the buffer size 513 and the previous packets being buffered are sequentially output to the processing units 515-521. In this case, the packet header processing unit 515 analyzes the packet headers output from the packet header area, analyzes the PID, and analyzes the additional information control parameter to determine whether the additional information processing unit 517 operates. In this case, if the packet includes the additional information, the packet header processing unit 515 commands the operation of the additional information processing unit 517 and transfers buffering position data of the additional information stored in the buffer 515 together.

Then, the additional information processor 517 checks the length of the additional information by inputting the output of the buffer 513 at the time when the additional information is output. In this case, if the packet includes only additional information, the additional information processing unit 517 processes the additional information packet output from the buffer 513. However, when the packet is a packet including the PES header information, the PES header processing unit 519 is instructed to transmit the position information of the PES header data stored in the buffer 513. The additional information processor 517 processes the additional information sequentially output from the buffer 513.

 When the PES header processing unit 519 receives the position data of the buffer 513 in which the PES header data is buffered together with an operation command from the packet header processing unit 515 or the additional information processing unit 517, the PES header processing unit 519 outputs the PES header data from the buffer 513. Inputs the PES header output from the buffer 513 to check the length of the PES header. In this case, if the packet includes only the PES header, the PES header processor 519 processes PES header data sequentially output from the buffer 513. In this case, the PES header data may be audio or video PES header data as described in Table 6 above. However, if the packet includes the actual data ES together with the PES header data, the PES header processing unit 519 analyzes the PES header length by inputting the output of the buffer 513 at the time point at which the PES header data is output from the buffer 513. After analyzing the length of the actual data ES, the data processor 521 transmits the position data of the actual data ES stored in the buffer 513 together with an operation command. The basic field data of the PES header output from the buffer 513 is processed.

When the data processor 521 receives the position data of the actual data stored in the buffer 513 together with an operation command from the PES header processor 521, packet identification information (audio PID or video PID) transmitted to the packet header processor 515 or the controller 300. The data output at the time point at which the actual data is output from the buffer 513 is made into the audio ES or the video ES and demultiplexed to the decoder 450 or 430 and output. In this case, the audio or video ES output from the data processor 521 becomes actual data obtained by depacking the packet data.

As described above, in the demultiplexing apparatus according to the embodiment of the present invention, when packets of the input TS signal include the additional information and / or PES header, corresponding processing units are operated according to the packet header information. That is, for example, when the input packet includes only additional information, the additional information processing unit 517 is operated to process the input packet, and the PES header processing unit 519 and data processing unit 521 are not driven. In addition, when the input packet includes a PES header and actual data, the PES header processing unit 519 checks whether the PES header is included. If the packet is configured only with the PES header, only the PES header processing unit 519 operates, and the actual data is included. If it is a packet, the PES header processing unit 519 and the data processing unit 521 are driven together to process the PES header and the actual data (ES), respectively. In addition, when the input packet consists of additional information, PES header, and actual data, the additional information processing unit 517 and / or PES header processing unit 519 and data processing unit 521 are driven together to generate additional information and / or PES header and actual data, respectively. Process the data. Therefore, when the packet includes additional information and / or PES headers in addition to the actual data (ES), the processing units for processing the corresponding data are driven in parallel to process the data at the same time, thereby quickly performing demultiplexing.

Therefore, in the case of the demultiplexer having a serial structure, the packet data is processed in the order of the packet header processing unit 515, the additional information processing unit 517, the packet header processing unit 519, and the data processing unit 521, so that the information to be processed (additional information, PES header, data) If not, all processing units are operated sequentially to consume unnecessary processing time. However, in the exemplary embodiment of the present invention, a processing unit is driven to process data only when the packet includes information to be processed by analyzing a received packet. As a result, the demultiplexing speed can be realized by reducing the data processing time.

Secondly, the demultiplexer having a serial structure has an input buffer (or an output buffer at the rear end) of each processing unit, and transmits the data output from the processing unit by byte unit, thereby making a very fast clock to transmit a packet. It also has a structure that requires a lot of time for data transfer by using multiple buffers. However, the present application parallelly buffers packet-sized data in the buffer, and when processing the data, the corresponding processing units respectively access the buffers in parallel and simultaneously process the data, thereby significantly reducing the time for transferring the data, thereby demultiplexing speed. Can greatly improve.

Thirdly, instead of retrieving all the bytes of the input packet during the synchronous search, after analyzing the stored bytes while storing the input packet in the buffer, only when the detected sync byte is out of the sync byte position of the buffer, A synchronization value is obtained by delaying the input byte data by the obtained subtraction value. Therefore, the synchronous search method can be simplified.

Secondly, a configuration of processing broadcast data based on IP like the DVB_H digital broadcast receiver will be described. At this time, the configuration of the DVB_H digital broadcast receiver has the same configuration as that in FIG. In the case of the DVB_H digital broadcast receiver, the broadcast receivers (RF tuner 100 and demodulator 120) and the multimedia processing unit 330 have a different configuration from that of the DVB_T digital broadcast receiver. This is because the DVB_H has to process an IP-based broadcast signal.

FIG. 17 shows the structure of the broadcast receivers (tuner 310 and demodulator 320) of the DVB_H.

Referring to FIG. 17, the PLL815 of the tuner 310 generates a frequency for setting a physical frequency of a broadcast channel under the control of RISC827, and a mixer 813 mixes the received broadcast signal with the output frequency of the PLL815. The broadcast signal of the set physical channel frequency is output, and the filter 817 filters and outputs the signal of the set physical channel frequency band. The A / D converter 821 of the demodulator 320 converts the output signal of the tuner 310 into digital data, and the OFDM demodulator 823 demodulates the modulated broadcast signal. The PID filter 825 filters the signal having the PID of the broadcast channel set in the demodulated signal, and the signal output from the PID filter 825 is buffered in the buffer 829 through the RISC827. At this time, the RISC827 controls the operation of time slicing to reduce power consumption of the digital broadcast receiver, and performs an MPE-FEC function to improve a reception rate by correcting an error generated during reception. The data buffered in the buffer 829 is an IP datagram.

The tuner 310 uses a direct conversion type tuner. The tuner 310 selects a broadcast signal having a set broadcast channel frequency and converts the broadcast signal into an I / Q signal. The demodulator 320 converts the output of the tuner 310 into digital data and demodulates the OFDM signal. In this case, the demodulated data has an MPEG2 TS structure and filters data having a PID of a broadcast channel set here. At this time, the PID filtered data has time information for time slicing and a parity byte table for MPE-FEC function. The time slicing is a technique adopted to reduce the power consumption of hardware in a digital broadcast receiver. The hardware is operated only when data corresponding to a desired broadcast is received, and the hardware is turned off when the desired data is not received. Using the time slicing technique, only PID data of a desired broadcast is output. Accordingly, only the data corresponding to the desired PID is received through the PID filter to perform the MPEG2 TS demultiplexing process in the RISC827. In this case, the MPEG2 TS demultiplexing process performed in the PID filtering process performs an operation of demultiplexing a signal of a broadcast channel set by a user among several broadcast channels using the same physical channel frequency, which is performed by the multimedia processing unit 330. This is different from MPEG2 TS demultiplexing. By performing the MPEG2 TS demultiplexing process, an FEC table consisting of only the MPE table and parity information can be obtained. The MPE table and the FEC table are used to perform an MPE-FEC function.

The broadcast receiver 130 sets the physical channel frequency of the tuner 210 in step 341. That is, when the control unit 110 receives the control data for setting the frequency of the broadcast channel, the RISC327 detects this and sets the physical channel frequency in the PLL315 of the tuner 310. Thereafter, the RISC327 sets a coding scheme, a coding rate, a guard interval, and the like in the OFDM demodulator 223. When the physical frequency is set as described above, the tuner 310 of the broadcast receiver 130 outputs a broadcast signal of the set physical channel frequency.

Then, the broadcast receiver 130 converts the output of the tuner 310 into digital data in step 343, OFDM (or COFDM) demodulates the digitally converted data in step 345, and data having a PID set among the demodulated data in step 347. To filter. Referring to the PID filtering operation, it is checked whether the PID of the TS stream output from the demodulator 323 matches the set PID (PID of a broadcast channel selected by the user). At this time, if the PID matches, the broadcast receiver 130 analyzes the PID of the input TS stream and controls the operations of the tuner 210 and the demodulator 220 according to the time slicing information. However, if the PID does not match, the PID filtering process ends and waits until the TS stream of the matched PID is input.

Thereafter, the broadcast receiver 130 demultiplexes the PID filtered data in step 349, extracts time slicing information in step 351, and then transfers the time slicing information to the PID filter 325. Thereafter, the broadcast receiver 130 stores the MPE section / FEC section in the buffer from the received data and checks whether all burst data have been received in step 357. If the burst receiver 130 does not receive the burst data, the broadcast receiver 130 returns to step 343 and repeats the above operation. When receiving the burst data, the broadcast receiver 130 reads the buffered data in step 359. Solomon decoding and generate an interrupt signal to the multi-data processing unit 120. The broadcast receiver 130 returns to step 343 and waits for reception of the next burst data of the set PID.

Therefore, the RISC827 delivers the IP datagram, which is the final data obtained by performing MPEG2 TS demultiplexing and MPE-FEC, to the multidata processor 130 to reproduce the broadcast.

Then, the multimedia processing unit 330 receives the IP datagram output from the demodulator 320, decapsulates the IP information, and demultiplexes the audio and video data. 18 is a diagram showing the configuration of the multimedia processing unit 330. FIG.

Referring to FIG. 18, an IP decapulator 400 processes IP information from an IP datagram output from the demodulator 320 to process a service data packet stream and an ESG data packet stream. Create a packet stream. The payload of the service data packet stream is transmitted to the demultiplexer 410, and the ESG data packet stream is applied to the controller 300. Here, the payload of the service data packet stream applied to the demultiplexer 410 is an A / V packet data stream, and the processing after the demultiplexer 210 is performed in the same manner as the DVB_T processing procedure. That is, in the case of a service data packet stream, after decapsulating the IP information, audio and video packets are processed in the same configuration and method as the DVB_T.

An operation procedure of the digital broadcast receiver having the above configuration will be described.

First, the reception and processing procedure of the digital broadcast, the control unit 300 outputs the channel data for receiving the broadcast channel signal set by the user to the broadcast receiver. In this case, the channel data may be physical channel frequency information of a desired broadcast and PID (PID: program ID) of a broadcast channel. The broadcast receiver includes a tuner 310 and a demodulator 320. The tuner 110 receives a broadcast signal transmitted through a corresponding frequency channel by setting a physical channel according to channel data set by the controller 300. The demodulator 320 of the broadcast receiver demodulates the broadcast signal output from the tuner 310, filters the PID of the demodulated signal, and applies a signal of a desired broadcast channel to the multimedia processing unit 330. At this time, an IP datagram transmitted to the multimedia processor 330 is a broadcast signal including IP information. At this time, the IP datagram has a structure as shown in Table 7, where the service (A / V) data packet stream has a structure as shown in Table 8, and the ESG data packet stream It has a structure as shown in Table 9.

service 1 service 2 service 3 data 1 data2 ------

IP header RTP header payload IP header RTP header payload ------

IP header FLUTE header payload IP header FLUTE header payload ------

The IP datagram transmitted from the broadcast receiver may have structures as shown in Tables 8 and 9, and the IP header may have a structure as shown in Table 10 below.

version IHL type of service total length identification flags fragment offset time to live protocol header checksum source address destination address options padding

In Table 10, version (4 bits) is a version of the IP format, and currently, IPv4 (internet protocol version 4) is used, and IPv6 is proposed as a next-generation format, and its use is expanding. IHL (internet header length (4 bits)) indicates the length of the IP header. The length of the IP header is 20 bytes (32 bits * 5 columns = 160 bits) as shown in Table 10. The 4 bytes of the last column are optional. The type of service (8 bits) is an item for controlling the priority of the transmitted IP datagram and performs a quality of service (QOS) function. The total length (16 bits) is an item indicating the size of the IP datagram to be transmitted and indicates the combined size of the IP header followed by the actual datagram. The identification (16) bit is a serial number that can distinguish each fragmented datagram when fragmentation occurs in the datagram to be transmitted. flags (3 bits) are used to indicate information about fragmentation of the datagram. The fragment offset (13 bits) indicates when the fragmentation of the datagram occurs, from which position of the original datagram the current datagram is fragmented. time to live (8 bits) is called the TTL and specifies the time the datagram is alive. The header checksum (16 bits) is information for checking a header error. The source address (32 bits) is the IP address of the sending side (the sending side), and the destination address (32 bits) is the IP address of the receiving side (the receiving side). The option (variable size) is used to add specific functionality depending on the nature of the program. This field is not required. It can be used to add security to datagrams, to add features such as QOS, or to add additional functionality related to routing. padding is used to set the size to 32 bits and is set to zero.

As described above, if the digital broadcast signal is a DVB_H signal, the received broadcast signal is data having an IP-based MPEG2 TS structure. Therefore, when receiving the DVB_H type broadcast signal, the multimedia processing unit 330 removes the IP information through the IP decapsulator 400 and analyzes the header information in the received MPEG2 TS structure through the demultiplexer 410 for video and Audio data should be demultiplexed and output.

The IP datagram output from the broadcast receiver may be input in a form as shown in Table 7, and each of the IP datagrams may have a structure as shown in Table 8 or Table 9. Therefore, when the IP datagram having the structure as shown in Table 7 is input, the IP decapsulator 400 analyzes the IP header as shown in Table 10 to confirm the IP version and the protocol to be used. Here, the IP version may include IP version 6 and IP version 4. Thereafter, the IP decapsulator 210 searches for a protocol by parsing an IP version 6 header when an IP version 6, and searches for a protocol by parsing an IP version 4 header when an IP version 4. Here, the protocol may use a UDP protocol and a TCP / IP protocol. Therefore, after checking the protocol, the IP decapsulator 400 checks the field of the IP header to obtain the payload length. The IP decapsulator 400 extracts the payload datagram, removes the UDP or TCP / IP header, and extracts the TS stream.

At this time, the IP datagram may have a structure as shown in Table 8 and Table 9 as described above. In this case, the service data packet stream as shown in Table 8 is a packet stream including video and audio data, and the ESG data packet stream as shown in Table 9 shows digital broadcast information (EPG, purchase, multimedia data, etc.). Packet stream to include. In the embodiment of the present invention, it is assumed that the ESG data packet stream is processed in software as described above. Accordingly, the IP decapsulator 400 delivers the ESG data packet stream to the controller 300. In addition, in the case of the service data packet stream as shown in Table 8, the RTP header is transmitted to the controller 110, and the payload portion is transmitted to the demultiplexer 410. In this case, the payload information delivered to the demultiplexer 410 may be a packet stream having an MPEG2 TS structure.

At this time, the structure of the demultiplexer 410 has a parallel structure as shown in FIG. Therefore, it is possible to effectively demultiplex the broadcast signal received by the digital broadcast receiver processing the broadcast signal based on the IP information, such as DVB_H.

Therefore, even in a digital broadcast receiver that processes an IP-based broadcast signal like the DVB_H scheme, the digital broadcast receiver uses the parallel demultiplexing structure of the TS data, so that the digital broadcast receiver includes information to be processed in the packet by analyzing the received packet. Only in this case, a corresponding processing unit may be driven to process data, thereby reducing the broadcast data processing time, thereby speeding up the demultiplexing speed.

Secondly, by using the parallel demultiplexer in the DVB_H type digital broadcast receiver, the data of the packet size is parallel-buffered in the buffer, and the data are processed at the same time by the corresponding processing units in parallel. This can significantly reduce the time required to do so, which can greatly speed up demultiplexing.

Thirdly, the DVB_H type digital broadcast receiver does not search all the bytes of the input packet during the synchronization search, but stores the input packet in the buffer and analyzes the stored byte. The subtraction value of the out of position is obtained only when out of position, and the input byte data is delayed by the obtained subtraction value to realize synchronization. Therefore, the synchronous search method can be simplified.

As described above, in the digital broadcast receiver, the demultiplexer is processed in parallel, and the buffers are analyzed to process the information included in the packets in parallel by the corresponding processing units, thereby improving the demultiplexing speed. By accessing and processing the stored packets, the configuration of the buffer can be simplified and the data transfer time can be greatly reduced. Also, in case of demultiplexing, buffer the input packet once, check the sync byte among the buffered data, determine the subtraction value from the position of the buffered sync byte to the originally set sync byte position, and delay the input data to obtain sync. This has the advantage of not having to perform synchronous detection every byte.

Claims (32)

In the demultiplexing apparatus of a digital broadcast receiver for processing packet data consisting of a packet header and a payload, A buffer for buffering incoming packet data, It is composed of a plurality of processing units connected in parallel to the buffer, The processing unit, A packet header processing unit which checks the packet header of the buffered packet data to determine whether additional information is included and generates a control signal according to whether the additional information is included; An additional information processing unit for processing additional information in the buffered payload data under control of the packet header processing unit; A PES header processing unit for processing a PES header in the buffered payload data by controlling the packet header processing unit; And a data processor for generating audio or video data of the buffered payload data into audio or video data and outputting the audio or video data to a decoder corresponding to the PES header processor. . The method of claim 1, wherein the packet header processing unit analyzes the additional information control parameter of the packet header to determine whether the payload data includes additional information, and when the additional information is included, the additional information processing unit is configured to display the additional information. And control the processing, and if the additional information is not included, controls the operation of the PES header processing unit. The method of claim 2, wherein the additional information processor analyzes the length of the additional information by analyzing the additional information field buffered in the buffer, and if the payload data consists only of the additional information, processes the additional information and transmits the additional information to the controller. And when the payload includes data having different data, the PES header processing unit transmits a data position other than the additional information buffered in the buffer, processes the additional information, and delivers the additional information to the controller. Receiver demultiplexer. The PES header processing unit of claim 3, wherein the PES header processing unit checks whether a payload buffered in the buffer includes a PES header, checks the length of the PES header when the PES header is included, processes the PES header, and transfers the PES header to the controller, and buffers the buffer. And a data position other than the received PES header is transmitted to a data processing unit. The method of claim 4, wherein the packet header processor analyzes a PID of a packet header and transmits a PID for identifying the buffered packet to the data processor. And the data processor generates the audio or video data buffered in the buffer as audio or video data, and transmits the audio or video data to corresponding decoders. The method of claim 1, wherein the buffer, First and second buffers having a packet data size, Outputting packet data stored in the second buffer while storing the input packet data in the first buffer, and outputting packet data stored in the first buffer while storing the input packet data in the second buffer. Demultiplexing apparatus for the digital broadcast receiver, characterized in that the address generator is configured to. The method of claim 1, wherein the buffer, Dual port memory of the data size, A first address generator which stores the input packet data in the memory; And a second address generator for outputting packet data stored in the memory. The method according to claim 1, wherein the packet data buffered in the buffer is examined, and a position that is out of the sync byte buffering position of the buffer is detected to detect a subtraction value, and then the packet is determined according to the subtraction value. And a synchronization search unit for delaying byte data of the data to synchronize packet synchronization. The method of claim 8, wherein the synchronous search unit, A synchronization checking unit for checking whether the byte data stored in the buffer is a synchronization byte; When the synchronization check unit detects a synchronization byte, the subtraction value extraction for checking a buffering position of the sync byte stored in the buffer and calculating a subtraction value from the sync byte buffering position set in the buffer to the buffering position of the stored sync byte byte Wealth, And a delay unit configured to delay the input packet data according to the calculated subtraction value and to buffer the received packet data in the buffer. 10. The apparatus of claim 9, wherein the buffering position of the sync byte set in the buffer is the first byte buffering position of the buffer. In the broadcast data receiving apparatus of a mobile terminal having a digital broadcast receiver, A broadcast receiver for receiving and demodulating a signal of a set broadcast channel and outputting a packet data stream; A multimedia processing unit for analyzing the packet data stream and generating decoded video and audio data; A display unit for displaying the decoded video data; A speaker for reproducing the decoded audio data, The multimedia processing unit, A demultiplexer comprising a buffer for buffering the packet data stream, and processing units connected in parallel to the buffer, wherein the processing units demultiplex the buffered packet data by parallel processing of the respective processing units; A video decoder for decoding the demultiplexed video erase data; And an audio decoder for decoding the demultiplexed audio edge data. The method of claim 11, The broadcast receiver receives and demodulates a signal of a broadcast channel of a set frequency, examines the ID of the demodulated packet stream, filters packet data of the set broadcast channel, and generates an IP datagram. The multimedia processing unit, And an IP decapsulator for decapsulating IP information of the IP datagram and outputting the IP information to the demultiplexer. The method of claim 12, wherein the demultiplexer, A buffer for buffering incoming packet data, A packet header processing unit which checks the packet header of the buffered packet data to determine whether additional information is included and generates a control signal according to whether the additional information is included; An additional information processing unit for processing additional information in the buffered payload data under control of the packet header processing unit; A PES header processing unit for processing a PES header in the buffered payload data by controlling the packet header processing unit; And a data processing unit for generating audio or video data of the buffered payload data into audio or video data and outputting the audio or video data to a decoder corresponding to the PES header processing unit. . 15. The method of claim 13, wherein the packet data buffered in the buffer is examined to determine the buffering position of the sync byte, and a position outside the sync byte buffering position of the buffer is detected to detect a subtraction value, and then the packet according to the subtraction value. And a synchronization search unit for delaying byte data of the data to synchronize packet synchronization. The method of claim 14, wherein the synchronous search unit, A synchronization checking unit for checking whether the byte data stored in the buffer is a synchronization byte; When the synchronization check unit detects a synchronization byte, the subtraction value extraction for checking a buffering position of the sync byte stored in the buffer and calculating a subtraction value from the sync byte buffering position set in the buffer to the buffering position of the stored sync byte byte Wealth, And a delay unit configured to delay the input packet data according to the calculated subtraction value and buffer the received packet data in the buffer. 16. The apparatus of claim 15, wherein a buffering position of a sync byte set in the buffer is a first byte buffering position of the buffer. 15. The apparatus of claim 14, wherein the packet header processing unit analyzes the additional information control parameter of the packet header to determine whether the payload data includes additional information, and when the additional information is included, the additional information processing unit processes the additional information. And controlling the operation of the PES header processing unit if the additional information is not included in the digital broadcasting receiver. 18. The method of claim 17, wherein the additional information processor analyzes the length of the additional information by analyzing the additional information field buffered in the buffer, and when the payload data includes only the additional information, processes the additional information and transmits the additional information to the controller. And when the payload includes data having different data, the PES header processing unit transmits a data position other than the additional information buffered in the buffer, processes the additional information, and delivers the additional information to the controller. Receiver demultiplexer. 19. The method of claim 18, wherein the PES header processing unit checks whether the PES header is included in the payload buffered in the buffer, checks the length of the PES header when the PES header is included, processes the PES header, and transfers it to the controller, and buffers the buffer. And a data position other than the received PES header is transmitted to a data processing unit. The method of claim 19, wherein the packet header processor analyzes a PID of a packet header and transmits a PID for identifying the buffered packet to the data processor. And the data processor generates the audio or video data buffered in the buffer as audio or video data, and transmits the audio or video data to corresponding decoders. In the method of demultiplexing the packet data consisting of the packet header and the payload in the digital broadcast receiver, Buffering the incoming packet data, Checking whether the payload is additional information by inspecting the buffered packet header; Processing the determined buffered side information if the payload is side information; If the payload is not additional information, the payload is examined to determine whether the payload includes a PES header. If the payload is included, the size of the PES header included in the payload is checked to determine whether audio / video data is included. Processing the PES header after determining whether to include and determining a buffering position of the audio / video data when the audio / video data is included; After the PES header processing or the packet data that does not include the PES header in the payload, the video / audio data of the payload is generated to generate video / audio esdata and transmitted to the corresponding decoders. Packet data demultiplexing method of the digital broadcast receiver characterized in that. 22. The method of claim 21, wherein a buffering position of the sync byte is examined in the buffered packet data, a position that is out of the sync byte buffering position is detected to detect a subtraction value, and then byte data of the packet data according to the subtraction value. And a synchronous retrieval process of matching packet synchronization by delaying the packet delay. The method of claim 22, wherein the synchronous search process, Checking whether byte data stored in the buffer is a sync byte; Checking a buffering position of the sync byte stored in the buffer when detecting the sync byte, and calculating a subtraction value from the sync byte buffering position set in the buffer to the buffering position of the stored sync byte byte; And delaying and buffering the input packet data according to the calculated subtraction value. 24. The method of claim 23, wherein the buffering position of the sync byte set in the buffer is the first byte position of the buffer buffering the first packet data. The method of claim 22, wherein the processing of the packet header, Analyzing the PID of the packet header and checking whether the target PID is a target PID, and storing the type identification information of the input packet only in the case of the target PID; Analyzing the additional information control parameter of the packet header, if the buffered packet includes the additional information, instructs the operation of the additional information processing process and transmits buffering position information of the additional information to be processed in the additional information processing process. Process, If the buffered packet does not include additional information, the packet data of the digital broadcast receiver is characterized by instructing an operation of the PES header processing process and transmitting buffering position information of the PES header to be processed in the PES header processing process. Demultiplex method. The method of claim 25, wherein the processing of the additional information, Analyzing the length of the additional information by accessing the additional information buffered in the buffer when a driving command is received; Processing the additional information and transmitting the additional information to a controller when the packet includes only additional information in the analysis process; When the packet includes a PES header in the analysis process, the buffering position information of the PES header is transmitted together with the driving command of the PES header, and then the additional information is processed and delivered to the controller. Packet data demultiplexing method of the digital broadcast receiver. The method of claim 26, wherein the processing of the PES header, Analyzing the length of the PES header by accessing the PES header buffered in the buffer when the driving command is received; Processing the PES header and transmitting the buffered packet to a controller when the buffered packet includes only a PES header in the analysis process; If the buffered packet includes the actual data in the analysis process, the buffering position information of the actual data is transmitted together with the driving command of the data processing unit, and then the operation of the data processing process is instructed, and the location of the buffered actual data. And processing the PES header and transmitting the information to the controller. The method of claim 27, wherein the data processing process, Identifying a type of a packet according to the stored PID when the driving command is received; And accessing the buffered real data, generating the video or audio ES from the real data according to the identified PID, and then demultiplexing the corresponding decoder to the corresponding decoder. In the broadcast data processing method of a mobile terminal having a digital broadcast receiver, A broadcast data reception process of receiving and demodulating a signal of a set broadcast channel and outputting a packet data stream; A multimedia data processing process of analyzing the packet data stream and generating decoded video and audio data; The process of playing the decoded video and audio data, The process of processing the multimedia data, Buffering the packet data stream, inspecting a packet header and payload of the buffered packet data, and demultiplexing the packet data into video and audio esdata; And decoding the demultiplexed video and audio edge data, respectively. The method of claim 28, The broadcast data receiving process, Receives and demodulates a signal of a broadcast channel of a set frequency, examines the ID of the demodulated packet stream, filters packet data of the set broadcast channel, and generates an IP datagram. The multimedia data processing process, And decapsulating the IP information of the IP datagram, and demultiplexing the IP decapsulated packet data stream. The method of claim 29, wherein the demultiplexing process, Buffering the incoming packet data, Checking whether the payload is additional information by inspecting the buffered packet header; Processing the determined buffered side information if the payload is side information; If the payload is not additional information, the payload is examined to determine whether the payload includes a PES header. If the payload is included, the size of the PES header included in the payload is checked to determine whether audio / video data is included. Processing the PES header after determining whether to include and determining a buffering position of the audio / video data when the audio / video data is included; After the PES header processing or the packet data that does not include the PES header in the payload, the video / audio data of the payload is generated to generate video / audio esdata and transmitted to the corresponding decoders. Digital broadcasting data processing method of a mobile terminal, characterized in that. 31. The method of claim 30, wherein after checking the buffering position of the sync byte in the buffered packet data, and detecting a subtraction value by checking a position out of the sync byte buffering position, the byte data of the packet data according to the subtraction value And a synchronous retrieval process of matching packet synchronization by delaying the delay time.

Images