Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
  • H04H20/10—Arrangements for replacing or switching information during the broadcast or the distribution
  • H04H20/103—Transmitter-side switching
• • 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]
  • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
  • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
  • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary 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]
  • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
  • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
  • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
  • H04N21/23608—Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
• • 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]
  • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
  • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
  • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
  • H04N21/2362—Generation or processing of Service Information [SI]
• • 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]
  • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
  • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
  • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
  • H04N21/2365—Multiplexing of several video streams
• • 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]
  • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
  • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
  • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
  • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
• • 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
  • H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
  • H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
• • 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
  • H04N21/4341—Demultiplexing of audio and video streams
• • 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]
  • H04N21/40—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
  • H04N21/4347—Demultiplexing of several video streams
• • 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 
  • H04N21/61—Network physical structure; Signal processing
  • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
  • H04N21/6112—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving terrestrial transmission, e.g. DVB-T
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N7/00—Television systems

Definitions

• the present invention relates to an apparatus and a method for transforming a terrestrial digital multimedia broadcasting (DMB) stream, and a system and method for transmitting the terrestrial DMB stream by using the terrestrial DMB stream transforming apparatus and method.
• DMB digital multimedia broadcasting
• a terrestrial digital multimedia broadcasting is a digital multimedia broadcasting service proving a data service or a moving picture service having a sound quality as good as that of compact disk (CD) and superior receiving quality when a subscriber is in motion.
• the terrestrial DMB has a narrow channel bandwidth, the amount of data transmitted through one channel is small. Therefore, a variety of broadcasting services providing multimedia broadcasting services with a small amount of data are developed.
• there is a still image service which does not synchronize a video stream and an audio stream but synchronizes a starting time and a finish time of a program based on an audio broadcasting service.
• the still image service synchronizes the starting time, a finish time and a conversion time of a picture, however, the still image service does not need a lip-sync.
• the conventional terrestrial DMB transmitting system includes an audio encoder 11, a data encoder 12, a multimedia encoder 13, an ensemble multiplexer 14 and a coder orthogonal frequency division multiplexing (COFDM) encoder 15.
• COFDM coder orthogonal frequency division multiplexing
• the audio encoder 11 encodes an audio source.
• the data encoder 12 encodes a data source.
• the multimedia encoder 13 encodes a multimedia source.
• the ensemble multiplexer 14 multiplexes an audio stream encoded in the audio encoder 11, a data stream encoded in the data encoder 12 and a multimedia stream encoded in the multimedia encoder 13 into a broadcasting stream (frame) of the ensemble transport interface standard.
• the COFDM encoder 15 encodes the multiplexed broadcasting stream (frame) in the ensemble multiplexer 14.
• the conventional terrestrial DMB transmitting system can provide a moving picture broadcasting service having a high transmission rate using a lip-sync by synchronizing a video stream and an audio stream, and a still image service having a low transmission rate.
• the stream piece of a broadcasting stream is defined as a part of the broadcasting stream. Disclosure of Invention Technical Problem
• an apparatus for transforming multimedia data into a terrestrial digital multimedia broadcasting (DMB) stream including: a program specific information (PSI) extracting unit for extracting PSI of a first stream and transmitting the first stream to a time code extracting means; a PSI analyzing unit for analyzing the PSI of the first stream extracted in the PSI extracting unit and acquiring construction information of the first stream; a PSI modifying unit for modifying in the PSI information based on PSI modification information transmitted from outside to thereby generate modified PSI; the time code extracting unit for extracting time code information from the first stream based on stream information having a time code; a time code modifying unit for modifying a time code of a second stream based on the time code information extracted in the time code extracting means; a stream erasing unit for erasing a stream piece of the first stream based on stream erasing information from the user to thereby generate modified first stream; and a multiplex
• a method for transforming multimedia data into a terrestrial digital multimedia broadcasting stream which includes the steps of: a) acquiring construction information from a first stream by extracting PSI of the first stream and analyzing the extracted PSI; b) modifying the PSI based on PSI modification information received from a user to thereby generate modified PSI; c) extracting time code information from the first stream based on stream information having a time code, and modifying a time code of a second stream based on the time code information to thereby generate modified second stream; d) erasing the stream piece of the first stream based on stream erasing information received from the user to thereby generate modified first stream; and e) multiplexing the modified PSI, the modified first stream and the modified second stream.
• a system for transmitting a terrestrial DMB stream which includes: an audio encoding unit for encoding an audio source; a data encoding unit for encoding a data source; a multimedia encoding unit for encoding a multimedia source received in real-time; a stream transforming unit for replacing a stream piece of a first stream with a second stream to thereby generate a transformed multimedia stream; an ensemble multiplexing unit for multiplexing an audio stream encoded in the audio encoding means, a data stream encoded in the data encoding unit and the transformed multimedia stream into a broadcasting stream that conforms to the ensemble transport interface standard; and an encoding unit for encoding the multiplexed broadcasting stream to thereby generate a encoded broadcasting stream and transmitting the encoded broadcasting stream.
• a method for transmitting a terrestrial DMB stream which includes the steps of: a) encoding an audio source; b) encoding a data source; c) encoding a multimedia source received in real-time or a pre-encoded multimedia source; d) replacing a stream piece of a first stream with a second stream to thereby generate a transformed multimedia stream; e) multiplexing the encoded audio stream, the encoded data stream and the transformed multimedia stream into a broadcasting stream that conforms to the ensemble transport interface standard; and f) encoding the multiplexed broadcasting stream and transmitting the encoded broadcasting stream to a transmitter.
• the present invention can provide a variety of a terrestrial DMB services to a user by transforming a stream piece of a first stream into a second stream based on a request from the user when a start time, a finish time and a conversion time of picture of an audio stream and a video stream are synchronized and lip-synch is not provided.
• Fig. 1 is a block diagram illustrating a conventional terrestrial digital multimedia broadcasting (DMB) transmitting system
• Fig. 2 is a block diagram illustrating a system for transmitting a terrestrial DMB stream in accordance with a first embodiment of the present invention
• Fig. 3 is a block diagram illustrating a system for transmitting the terrestrial DMB stream in accordance with a second embodiment of the present invention
• Fig. 1 is a block diagram illustrating a conventional terrestrial digital multimedia broadcasting (DMB) transmitting system
• Fig. 2 is a block diagram illustrating a system for transmitting a terrestrial DMB stream in accordance with a first embodiment of the present invention
• Fig. 3 is a block diagram illustrating a system for transmitting the terrestrial DMB stream in accordance with a second embodiment of the present invention
• Fig. 1 is a block diagram illustrating a conventional terrestrial digital multimedia broadcasting (DMB) transmitting system
• Fig. 2 is a block diagram illustrating a system for transmitting a terrestrial DMB stream in
• FIG. 4 is a block diagram illustrating a stream transformer for transforming the terrestrial DMB stream in accordance with an embodiment of the present invention
• FIG. 5 is a diagram describing a method for transforming terrestrial DMB stream in accordance with the present invention
• Fig. 6 is a flowchart illustrating a method for transforming the terrestrial DMB stream in accordance with an embodiment of the present invention
• Fig. 7 is a flowchart illustrating a method for transmitting the terrestrial DMB stream in accordance with an embodiment of the present invention.
• Fig. 2 is a block diagram illustrating a system for transmitting a terrestrial DMB stream in accordance with a first embodiment of the present invention.
• the terrestrial DMB stream transmitting system of the present invention includes an audio encoder 21, a data encoder 22, a multimedia encoder 23, a stream transformer24, an ensemble multiplexer 25 and a coder orthogonal frequency division multiplexing (COFDM) encoder 26.
• COFDM coder orthogonal frequency division multiplexing
• the audio encoder 21 encodes an audio source to generate an audio stream.
• the data encoder 22 encodes a data sourceto generate a data stream.
• the multimedia encoder 23 encodes a multimedia source.
• the stream transformer 24 replaces a stream piece of a multimedia stream encoded in the multimedia encoder 23 with a received stream to thereby generate a transformed multimedia stream.
• the ensemble multiplexer 25 multiplexes the audio stream encoded in the audio encoder 21, the data stream encoded in the data encoder 22 and the transformed multimedia stream into a broadcasting stream which is formed of frames that conform to the ensemble transport interface standard.
• the COFDM encoder 26 encodes the multiplexed broadcasting stream in the ensemble multiplexer 25 and transmits the encoded broadcasting stream to a transmitter.
• Fig. 3 is a block diagram illustrating a system for transmitting a terrestrial DMB stream in accordance with a second embodiment of the present invention. [42] As shown in Fig.
• the system for transmitting the terrestrial DMB stream in accordance with the present invention includes an audio encoder 31, a data encoder 32, a stream storage 33, a stream transformer 34, an ensemble multiplexer 35 and a coder orthogonal frequency division multiplexing (COFDM) encoder 36.
• the audio encoder 31 encodes an audio source to generate an audio stream.
• the data encoder 32 encodes a data source to generate a data stream.
• the stream storage 33 stores an encoded multimedia stream.
• the stream transformer 34 replaces a stream piece of a multimedia stream stored in the stream storage 33 with a received stream to thereby generate a transformed multimedia stream.
• the ensemble multiplexer 35 multiplexes the audio stream encoded in the audio encoder 31, the data stream encoded in the data encoder 32 and the transformed multimedia stream into a broadcasting stream.
• the broadcasting stream includes frames that conform to the ensemble transport interface standard.
• the COFDM encoder 36 encodes the multiplexed broadcasting stream in the ensemble multiplexer 35 to generate encoded stream and transmits the encoded stream to a transmitter.
• Fig. 4 is a block diagram illustrating a stream transformer for transforming a terrestrial DMB stream in accordance with the present invention.
• a first stream is an encoded stream encodedin the multimedia encoder 23 in real-time or a stored stream in the stream storage 33.
• a second stream represents a replacement stream and a third stream represents a transformed stream that a stream piece of the first stream is replaced with the second stream.
• the encoded multimedia stream of the terrestrial DMB is a type of a
• the MPEG-2 transport stream includes a video stream, an audio stream and program specific information (PSI).
• PSI program specific information
• the PSI includes construction information of stream.
• the stream transformer for transforming terrestrial DMB stream includes a program specific information(PSI) extracting unit 41, a PSI analyzing unit 42, a PSI modifying unit 43, a time code extracting unit 44, a time code modifying unit 45, a stream erasing unit 46 and a stream multiplexing unit 47.
• PSI program specific information
• the program specific information (PSI) extracting unit 41 transmits the first stream to a time code extracting unit 44 and extracts program specific information (PSI) of the first stream.
• the PSI analyzing unit 42 analyzes the extracted PSI in the PSI extracting unit 41 and acquires construction information of the first stream.
• the PSI modifying unit 43 modifies the extracted PSI based on PSI modification information received from a user to generate modified PSI.
• the time code extracting unit 44 extracts time code information from the first stream based on stream information having a time code received from the user.
• the time code modifying unit 45 modifies a time code of the second stream by using the time code information extracted in the time code extracting unit 44.
• the stream erasing unit 46 erases a corresponding stream piece of the first stream based on stream erasing information received from the user to thereby generate a first modified stream.
• the stream multiplexing unit 47 multiplexes the modified PSI from the PSI modifying unit 43, the first modified stream from the stream erasing unit 46 and the second modified stream from the time code modifying unit 45, to thereby generate the third stream.
• the second modified stream means the second stream of which time code is modified.
• the time code modifying unit 45 synchronizes a starting time, a finish time and a conversion time of a picture of the first stream and the second stream for providing natural video service and audio service similar to the moving picture broadcasting service. That is, the time code information of the second stream is modified based on the time code information extracted from the first stream. Since two streams are combined by using the time code information, natural broadcasting service can be provided.
• the time code extracting unit 44 may receive the stream information having a time code from the PSI analyzing unit 42.
• the stream erasing unit 46 may receive the erasing stream information from the PSI modifying unit 43.
• FIG. 5 is a diagram describing a method for transforming terrestrial DMB stream in accordance with the present invention.
• a first stream includes an audio broadcasting data and a plurality of still images (a first still image) which are produced by the terrestrial DMB multimedia broadcasting service standard.
• the stream transformer for transforming the terrestrial DMB stream of the present invention outputs a third stream by using a second stream having a second still image.
• the third stream includes the audio broadcasting data and the second still image.
• the stream transformer of the present invention receives the first stream including the first still image and the audio broadcasting data and the second stream including the second still image. Then, the stream transformer erases the first still image of the first stream and inserts the second still image into the first stream. Accordingly, the first still image of the first stream is transformed into the second still image of the second stream. Finally, the third stream includes the second still image and the audio broadcasting data.
• FIG. 6 is a flowchart illustrating a method for transforming the terrestrial DMB stream in accordance with the present invention.
• PSI program specific information
• step S602 information on stream to be transformed in the PSI is modified based on PSI modification information received from a user.
• step S603 time code information from a stream piece of the first stream is extracted based on stream information having a time code.
• a time code of a second stream is modified based on the time code information.
• step S605 the stream piece of the first stream is erased based on stream erasing information received from the user.
• step S606 the modified PSI, the first modified stream and the second modified stream are multiplexed.
• Fig. 7 is a flowchart illustrating a method for transmitting the terrestrial DMB stream in accordance with the present invention.
• an audio source is encoded at step S701.
• a data source is encoded.
• a multimedia source received in real-time is encoded or a pre- encoded multimedia stream stored in the stream storage 33 is forwarded.
• a stream piece of a first stream encoded or forwarded at step S703 is replaced with a second stream to thereby generate a transformed multimedia stream.
• step S705 the encoded audio stream, the encoded data stream and the transformed multimedia stream are multiplexed into a broadcasting stream based on the ensemble transport interface standard.
• the multiplexed broadcasting stream is encoded and the encoded broadcasting stream is transmitted to a transmitter.
• the above described method according to the present invention can be embodied as a program and be stored on a computer readable recording medium.
• the computer readable recording medium is any data storage device that can store data which can be read by the computer system.
• the computer readable recording medium includes a read-only memory (ROM), a random-access memory (RAM), a CD-ROM, a floppy disk, a hard disk and an optical magnetic disk.

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Multimedia (AREA)
• Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=37637348

Family Applications (1)

Country Status (3)

Family Cites Families (6)

• 2005
  • 2005-07-12 KR KR1020050062667A patent/KR100728237B1/ko not_active Expired - Fee Related
• 2006
  • 2006-07-11 WO PCT/KR2006/002723 patent/WO2007008029A1/en not_active Ceased
  • 2006-07-11 EP EP06769252A patent/EP1908283A4/de not_active Withdrawn

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