KR20090053338A - Digital video broadcasting-handheld encoding system - Google Patents

Digital video broadcasting-handheld encoding system Download PDF

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Publication number
KR20090053338A
KR20090053338A KR1020070120148A KR20070120148A KR20090053338A KR 20090053338 A KR20090053338 A KR 20090053338A KR 1020070120148 A KR1020070120148 A KR 1020070120148A KR 20070120148 A KR20070120148 A KR 20070120148A KR 20090053338 A KR20090053338 A KR 20090053338A
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KR
South Korea
Prior art keywords
burst data
encoding
receiving
signal
dvb
Prior art date
Application number
KR1020070120148A
Other languages
Korean (ko)
Inventor
한영애
Original Assignee
주식회사 창해에너지어링
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Priority to KR1020070120148A priority Critical patent/KR20090053338A/en
Publication of KR20090053338A publication Critical patent/KR20090053338A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/643—Communication protocols
    • H04N21/64315—DVB-H
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/16—Aspects of broadcast communication characterised by the type of broadcast system digital video broadcasting - handhelds [DVB-H]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2212/00—Encapsulation of packets

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

DVB-H encoding system is provided. The present invention provides an encoding apparatus for receiving analog video signals and analog audio signals through a plurality of service channels and encoding the same in an IP data cast format, receiving the encoded signals from the encoding apparatus, encapsulating, multiplexing and outputting the encoded signals. It includes an encapsulator device. According to the present invention, in encoding an analog signal input through a plurality of service channels in a DVB-H encoding system, it is possible to stably perform encoding without loss of data.

Encoding, Audio, IP, Channel DVB, Data Cast, Data, Analog, Encapsulation.

Description

Digital Video Broadcasting-Handheld encoding system

The present invention relates to a DVB-H encoding system, and more particularly, to a DVB-H encoding system capable of more efficiently encoding, encapsulating, and multiplexing by receiving analog video signals and analog audio signals through a plurality of service channels. It is about.

In general, DVB-H broadcasting is based on DVB-T (Digital Video Broadcasting-Terrestrial), and is improved to operate at low power in consideration of portability of a broadcast receiving terminal. In order to be able to operate at such a low power, the DVB-H broadcast receiving terminal uses a time slice scheme. In this case, the time division method uses power only when receiving packet data corresponding to a channel selected by a user, and saves power by turning off a part of a circuit until receiving the next packet data.

The conventional DVB-H encoding system encodes an analog video signal into a signal suitable for a mobile terminal according to the DVB-H standard defined by the European Telecommunications Standards Institute (ETSI). However, in the conventional DVB-H encoding system, there is a problem that data is often lost in encoding data transmitted from a plurality of variable service channels. In addition, in the conventional DVB-H encoding system, there is a problem that the size and interval of the burst data are inefficient in terms of bandwidth utilization.

The present invention has been made to solve the above problems, and implements an apparatus for receiving and encoding an analog signal and an apparatus for encapsulating the encoded signal in a separate process, thereby ensuring stable and rapid data transmission. It is an object of the present invention to provide a DVB-H encoding apparatus to be achieved.

In order to achieve the above object, the present invention provides an encoding apparatus for receiving an analog video signal and an analog audio signal through a plurality of service channels and encoding the same in an IP data cast format, and receiving and encoding an encoded signal from the encoding apparatus. It includes an encapsulation device for encapsulation, multiplexing and outputting.

The encoding apparatus may include an encoder for receiving and encoding an analog video signal and an analog audio signal for each service channel. In this case, the encoder may set and encode a bit rate for each service channel.

The encapsulator device generates a receiving module as many as the number of encoders, encapsulates the datacast receiving unit receiving the encoded signal through the receiving module determined for each encoder, and the signal received from the datacast receiving unit, and multiplexes. It may be made to include an encapsulation unit for outputting.

The encapsulator device may further include a message queue allocated for each service channel between the datacast receiver and the encapsulation unit.

The encapsulation unit includes a burst data generation unit for generating burst data by receiving a signal output from the datacast receiver, and a burst data multiplexer for multiplexing and outputting burst data generated by the burst data generator. Can be.

The encapsulation unit may further include a memory buffer allocated for each service channel to store data output from the burst data generator.

The burst data generation unit may generate burst data generation modules as many as the number of reception modules of the datacast reception unit, and generate burst data by receiving a signal through a burst data generation module determined for each reception module.

Each burst data generation module determines the size and time slice interval of burst data according to the rate of the received signal, and accordingly generates a Multiprotocol Encapsulation (MPE) section and a Multiprotocol Encapsulation-Forward Error Correction (MPE-FEC) section. Burst data can be generated via the MPE section and the MPE-FEC section.

 The burst data multiplexer generates PSI / SI (Program Specific Information / Service Information) information using the size and time slice interval of burst data received from each burst data generation module, calculates a bit rate of the received burst data, and In addition, the burst data and the PSI / SI information may be multiplexed and output according to the frequency bandwidth according to the calculated bit rate.

When the number of encoders is changed, the encapsulator device may modify the execution script to add or delete the receiving module and the burst data generating module by the number of changed encoders.

According to the present invention, in encoding an analog signal input through a plurality of service channels in a DVB-H encoding system, it is possible to stably perform encoding without loss of data and to flexibly utilize bandwidth according to the situation of each channel. There is an effect of using the bandwidth more efficiently.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a block diagram showing the internal structure of a DVB-H encoding system according to an embodiment of the present invention. The DVB-H encoding system consists of an encoding device 100 and an encapsulator device 200.

The encoding apparatus 100 receives analog video signals and analog audio signals through a plurality of service channels and encodes them in an IP data cast format. For reference, IP datacasting means that digital content format, software application, program interface, and multimedia are provided based on Internet Protocol (IP) through digital broadcasting. In mobile IP datacasting, various packetized multimedia data is transmitted to a consumer terminal through a broadcasting network, not a communication network.

The encapsulator device 200 receives an encoded signal from the encoding device 100 to encapsulate, multiplex and output the encoded signal. In FIG. 1, the encapsulator device 200 includes a datacast receiver 210 and an encapsulation unit 220. Detailed description of the encapsulator device 200 will be described later.

In the present invention, the encoding apparatus 100 may include an encoder for receiving and encoding analog video signals and analog audio signals for each service channel. In FIG. 1, it can be seen that the encoding apparatus 100 includes encoders 110a, 110b,..., 110n for each service channel.

The encoder 110 sets and encodes bitrates for each service channel. That is, the encoder 110 sets and encodes the bit rates of the video signal and the audio signal separately according to the type of the service channel.

In the present invention, the encoder 110 receives an analog video signal and an analog audio signal and encodes using a predetermined compression standard. For example, the analog video signal is encoded using the compression standard of H.264, and the analog audio signal is encoded. The signal can be encoded using the compression standard of AAC +.

2 is a block diagram showing the internal structure of the encapsulator device 200 according to an embodiment of the present invention.

The datacast receiving unit 210 generates the receiving modules 211a, 211b, ..., 211n by the number of encoders 110a, 110b, ..., 110n, and encodes the signals through the receiving module determined for each encoder. It serves to receive. In an embodiment of the present invention, the signal encoded in the encoder may be transmitted using UDP / IP. In this case, since the reliability of the transmission is not guaranteed, it is preferable that the receiving modules are independently executed with high priority.

The encapsulation unit 220 serves to encapsulate, multiplex, and output the signal received from the data cast receiver 210.

The message queue 230 is allocated for each service channel between the datacast receiving unit 210 and the encapsulation unit 220, and buffers a difference in execution speed between the datacast receiving unit 210 and the encapsulation unit 220. Play a role.

In the present invention, the encapsulation unit 220 is a burst data generation unit 221 for generating burst data by receiving the signal output from the datacast receiving unit 210, the burst generated by the burst data generation unit 221 And a burst data multiplexer 223 for multiplexing and outputting data.

3 is a block diagram showing the internal structure of the encapsulation unit 220 according to an embodiment of the present invention.

The burst data generation unit 221 generates burst data generation modules 222a, 222b, ..., 222n by the number of reception modules 211a, 211b, ..., 211n of the datacast receiver 210, respectively. It receives a signal through a burst data generation module determined for each reception module and generates burst data.

Each burst data generation module 222 determines the size of the burst data and the time slice interval according to the rate of the received signal. Create a section, and generate burst data through this MPE section and the MPE-FEC section. For example, the burst data generation module 222 may generate an Mpeg2 TS stream data through the MPE section and the MPE-FEC section.

In an embodiment of the present invention, when the rate of the received signal is 450 [Kbps], the burst data generation module 222 sets the size of the burst data to 630 [Kbit] and the burst bandwidth is 3.2 [Mbps]. Can be set to The time slice interval is determined in consideration of the size of the determined burst data. As an example of determining the time slice interval, a method of obtaining the equation using the following equation is proposed.

That is, in one embodiment of the present invention, when Bd is a burst duration, Bs is a size of burst data, and Bb is a burst bitrate.

Bd = Bs / (Bb * 0.96) (1)

Satisfies the formula.

In an embodiment of the present invention, the burst data generation module 222 may obtain a burst duration through Equation (1), and obtain a time slice interval by adding a burst off time to the burst duration.

In an embodiment of the present invention, the burst data generated by each burst data generation module 222 may have a different size, and the size and time slice interval of the burst data generated by one burst data generation module 222 may be changed every time. can be different. As described above, in the present invention, the size of the burst data is adjusted according to the rate of the received signal, thereby preventing unnecessary waste of overhead and frequency bands.

The burst data multiplexer 223 generates PSI / SI (Program Specific Information / Service Information) information using the size and time slice interval of the burst data received from each burst data generation module 222, and receives the received burst data. Calculate the bit rate of and output the multiplexed burst data and PSI / SI information according to the frequency bandwidth according to the calculated bit rate.

In an embodiment of the present invention, the burst data multiplexer 223 sequentially receives the Megg 2 TS burst data from the burst data generation module 222 and arranges a time slice accordingly. For example, when the bandwidth of the burst data generated by the burst data generation module 222a is 3.2 [Mbps], the burst data multiplexer 223 arranges two time slices to sufficiently use the bandwidth.

In an embodiment of the present invention, the burst data multiplexer 223 multiplexes the time slice and the PSI / SI information according to the bit rate of the received burst data, and then outputs the final Megg 2 TS data.

The memory buffer 225 is allocated for each service channel to store data output from the burst data generator 221.

In an embodiment of the present invention, when the number of the encoders 110 is changed, the encapsulator apparatus 200 may modify the execution script so that the receiving module 211 and the burst data generating module 222 are changed by the number of the encoders 110 changed. ) Can be added or deleted. In the present invention, the burst data multiplexer 223 may automatically place a time slice even when the burst data generation module 222 of the burst data generator 221 is added or deleted, and perform a multiplex function according to a specified frequency bandwidth. have.

While the invention has been described using some preferred embodiments, these embodiments are illustrative and not restrictive. Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the invention and the scope of the rights set forth in the appended claims.

1 is a block diagram showing the internal structure of a DVB-H encoding system according to an embodiment of the present invention.

2 is a block diagram illustrating an internal structure of an encapsulator device according to an embodiment of the present invention.

3 is a block diagram illustrating an internal structure of an encapsulation unit according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100 Encoding Unit 200 Encapsulator Unit

110 Encoder 210 Datacast Receiver

220 Encapsulation 211 Receiver Module

230 Message Queuing 221 Burst Data Generator

223 Burst Data Multiplexer 222 Burst Data Generation Module

225 memory buffer

Claims (11)

An encoding device that receives an analog video signal and an analog audio signal through a plurality of service channels and encodes the same into an IP data cast format; An encapsulator device for receiving an encoded signal from the encoding device, encapsulating, multiplexing and outputting the encoded signal. DVB-H encoding system comprising a. The method of claim 1, The encoding apparatus is a DVB-H encoding system, characterized in that the encoder for receiving and encoding the analog video signal and the analog audio signal is provided for each service channel. The method of claim 2, The encoder is a DVB-H encoding system, characterized in that for setting the bitrate (bitrate) for each service channel for encoding. The method of claim 2, The encapsulator device A datacast receiving unit generating as many receiving modules as the number of encoders and receiving signals encoded through the receiving module determined for each encoder; And an encapsulation unit for encapsulating, multiplexing, and outputting a signal received from the data cast receiver. The method of claim 4, wherein The encapsulator device further comprises a message queue allocated for each service channel between the datacast receiver and the encapsulation unit. The method according to claim 4 or 5, The encapsulation unit includes a burst data generator for generating burst data by receiving a signal output from the datacast receiver; And a burst data multiplexer for multiplexing and outputting burst data generated by the burst data generator. The method of claim 6, The encapsulation unit further comprises a memory buffer allocated for each service channel to store the data output from the burst data generation unit. The method of claim 6, The burst data generation unit generates a burst data generation module as many as the number of reception modules of the datacast receiver, and receives a signal through a burst data generation module determined for each reception module to generate burst data. . The method of claim 8, Each burst data generation module determines the size and time slice interval of burst data according to the rate of the received signal, and accordingly generates a Multiprotocol Encapsulation (MPE) section and a Multiprotocol Encapsulation-Forward Error Correction (MPE-FEC) section. DVB-H encoding system characterized by generating burst data through MPE section and MPE-FEC section. The method of claim 9, The burst data multiplexer generates PSI / SI (Program Specific Information / Service Information) information using the size and time slice interval of burst data received from each burst data generation module, calculates a bit rate of the received burst data, and DVB-H encoding system, characterized in that to output the multiplexed burst data and PSI / SI information according to the frequency bandwidth according to the calculated bit rate. The method of claim 8, The encapsulator device, if the number of encoders is changed, modifying the execution script to add or delete the receiving module and burst data generation module by the number of the changed encoder.
KR1020070120148A 2007-11-23 2007-11-23 Digital video broadcasting-handheld encoding system KR20090053338A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101401746B1 (en) * 2009-10-29 2014-05-30 한국전자통신연구원 Apparatus and method for multiplexing of multimedia data

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101401746B1 (en) * 2009-10-29 2014-05-30 한국전자통신연구원 Apparatus and method for multiplexing of multimedia data

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