CN100542231C - The equipment of signaling transmission code set in data broadcasting - Google Patents

Abstract

A kind of method and apparatus that is used at the data broadcasting signaling transmission code set is provided.A kind of client computer of transmission code collection marker method of using comprises: demultiplexer is used for decomposing corresponding to Packet Elementary Stream (PES) bag by user selected program from the broadcasting stream multichannel that is received by system interface; Image decoder is used for the PES decoding that the multichannel that is used for image is decomposed; Voice decoder is used for the PES decoding that the multichannel that is used for sound is decomposed; And CPU, be used for taking out information about the transmission code collection of the character string object carousel message, used from the message PES that multichannel is decomposed, and based on the character string decoding of information in object carousel message, using about the transmission code collection of this taking-up.

Description

The equipment of signaling transmission code set in data broadcasting

Technical field

The present invention relates to the equipment and the method for a kind of sign (signal) transmission code collection (transmission code set), more particularly, relate to a kind of in transmitting about the data of the character coding system of the pathname in the object carousel message (object carousel message) for the method for signaling transmission code set by using various language named track names.

Background technology

Digital broadcasting is a kind of broadcast technology that bi-directional data transmitted and be different from the advanced person of the data reproduction of analog broadcasting and storage of carrying out.In digital broadcasting, the TV signal is compressed and is recorded in digital signal wherein and is broadcasted as encoded data signals.Because the quantity of the signal that can be transmitted via digital broadcasting big six times than in the analog broadcasting is so the resolution of the signal in the digital broadcasting is the twice in the analog broadcasting at least.In addition, because digital radio signals can be stored a plurality of images and audio file, so form contrast with channel in the analog broadcasting, six to eight channels can be moved in identical bandwidth in digital broadcasting.Similarly, digital broadcasting has become the core technology of information age, and by it, image and audio file can be compressed and transmit, and various signal can be modulated by using the computer based communication technology.Therefore, the TV in the digital broadcasting is converted into positive multimedia device from the passive device of tradition.

Data broadcasting as the essential element of digital broadcasting, except image file, audio files, software application and data flow, also numeral/multimedia broadcast contents is sent to continuously messaging device such as PC, top box of digital machine and personal portable terminals.Data broadcasting does not need return path, and messaging device without request content received content.Like this, data broadcasting is a kind of technology of transmitting with very high speed the height advanced person of two-way multimedia content in conjunction with broadcasting method, communication means and internet.Therefore, data broadcasting can solve the one-way of traditional analog broadcasting and simplicity and about the restriction of picture quality, tone quality and Internet Broadcast capacity.

The example of digit broadcasting system comprises advanced television system committee (ATSC) system that uses in the U.S. as the earthwave receiving system and digital video broadcasting-land (DVB-T) system that uses in Europe and OpenCable system that uses in the U.S. as wired receiving system and DVB-Cable (DVB-C) system that uses in Europe.The example that is used for the middleware Technology of digital broadcasting comprises DVB-MHP (DVB-MHP), OpenCable application platform (OCAP) and advanced common application platform (ACAP).DVB-MHP is the middleware system that is used for by the European digital TV of DVB Project design.OCAP is the middleware system that is used for by the digital cable box that CNN adopted of the U.S. and other digital device.ACAP has been designed to the digital TV DASE (DASE) that is unified in the OCAP that is used in the wired broadcasting and is used in ground wave broadcast.

DVB-MHP, OCAP and ACAP use the object carousel by ISO-IEC 13818-6 standard definition.In order to exchange the pathname assembly that is used for named data, catalogue and file, object carousel uses common object request broker architecture (CORBA) word string that is defined in CORBA/IIOP 2.1 standards.In addition, when character-coded data not in the CORBA word string when designated, object carousel is used for ISO 8859-1 (the ISO Latin 1) standard of coded system.Therefore, these ISO 8859-1 standards of using the middleware Technology of object carousel to be used for the basic coding system are come named track name, file and catalogue.Yet DVB-MHP, OCAP and ACAP only support Latin language for pathname, thereby can not represent pathname by using another kind of language.

Summary of the invention

The invention provides and a kind ofly be used for reporting that information about coded system is to represent the method and apparatus of pathname in the system that uses object carousel by using multilingual.

According to an aspect of the present invention, provide a kind of client computer of using transmission code collection marker method in the Radio Data System of using object carousel, this client computer comprises: system interface is used to receive the broadcasting stream by server broadcast; Demultiplexer is used for decomposing corresponding to Packet Elementary Stream (PES) bag by user selected program from the broadcasting stream multichannel that is received by system interface; Image decoder is used for the PES decoding that the multichannel that is used for image is decomposed; Voice decoder is used for the PES decoding that the multichannel that is used for sound is decomposed; And CPU (CPU), be used for taking out information about the transmission code collection of the character string object carousel message, used from the message PES that multichannel is decomposed, and based on the character string decoding of information in object carousel message, using about the transmission code collection of this taking-up.

According to a further aspect in the invention, provide a kind of server that uses transmission code collection marker method in the Radio Data System of using object carousel, this server comprises: image encoder is used for coded image data and generation image bitstream; Vocoder is used for voice data coding and generation sound bit stream; Multiplexer is used for multiplexed image bitstream harmony phoneme stream and produces transport stream; The RF signal processing unit is used for transport stream is modulated into the signal that will be output; And CPU, be used to control image encoder, vocoder, multiplexer and RF signal processing unit, generation will be loaded in the object carousel message on the transport stream, and produce the message comprise about the information of the transmission code collection of the character string used in this message.

According to a further aspect in the invention, provide a kind of method of signaling transmission code set, this method comprises: receive message from server, this message comprises the information about the transmission code collection of the character string of using in object carousel message; From the message that receives, take out information about the transmission code collection; With based on about the character string decoding of the information of transmission code collection in object carousel message, using.

Description of drawings

By the reference accompanying drawing exemplary embodiment of the present invention is described in detail, above and other aspect of the present invention will become clear, wherein:

Fig. 1 is the block diagram that the notion of DSM-CC model is shown;

Fig. 2 illustrates the DVB service that comprises object carousel spectrum (spectrum);

Fig. 3 illustrates the form of BIOP message;

Fig. 4 illustrates the form of the ServiceGatewayInfo () of downloadServerInitiate (DSI) message;

Fig. 5 illustrates the form of BIOP::DirectoryMessage;

Fig. 6 illustrates the form of BIOP::FileMessage;

Fig. 7 is the block diagram of server according to an exemplary embodiment of the present invention;

Fig. 8 is the block diagram of client computer according to an exemplary embodiment of the present invention; With

Fig. 9 is the flow chart that illustrates according to the method for the signaling transmission code set of exemplary embodiment of the present invention.

Embodiment

By the following detailed description to exemplary embodiment and accompanying drawing of reference, the present invention and realization method of the present invention can more easily be understood.Yet the present invention can be implemented with different forms and should not be construed as limited to exemplary embodiment set forth herein.More suitably, provide these exemplary embodiments so that the disclosure will be thoroughly and fully and will intactly convey to those skilled in the art to notion of the present invention, and the present invention will only be limited by appended claim.Label identical in the specification is represented identical parts all the time.

Now with reference to the accompanying drawing that shows exemplary embodiment of the present invention the present invention is described more completely.

Digital storage media command and control (DSM-CC) standard is that a cover is provided for managing MPEG-1 and MPEG-2 bit stream with the controlled function that sends the multimedia broad band service and the agreement of operation.The notion of object carousel has been defined within the DSM-CC standard and has been reflected in the DVB standard, is adopted as the middleware standard that is used for digital broadcasting by DVB-MHP, OCAP and ACAP then.

Fig. 1 illustrates the notion of DSM-CC model.

In the DSM-CC model, the stream that is produced by server 120 is sent to client computer 110, and server 120 and client computer 110 all are taken as the user.Client computer 110 is to use set-top box, PC or the personal portable terminals of content of multimedia.Server 120 provides content of multimedia and service.Network 130 expressions provide a cover communication component of the connection between the user.In Fig. 1, the connection 136 of transporting user-to-network (U-N) data with transport the user to 134 being shown being connected of user (U-U) data.The U-U information flow is used between client-server, and the U-N information flow is being used between network and the client computer or between network and the server.DSM-CC has defined the logic entity that is called as session and explorer (SRM).In this case, SRM 132 provides the centralized management of session and Internet resources.

The DVB system provides the transmission that connects the mpeg 2 transport stream (TS) of the various transmission mediums of process from the U-U of DSM-CC standard by adopting.MPEG-2 TS comprises MPEG-2 video and MPEG-2 audio frequency.Data broadcasting is taken as the main expansion based on the DVB transmission standard of MPEG-2.The example of data broadcasting comprises via satellite, the software download of cable or terrestrial links, through the transmission and the interactive TV of the Internet service of broadcast channel.Data message can be sent out in being included in MPEG-2 TS the time.The example that sends the method for data message comprises data pipe, data flow, multi-protocols encapsulation, data carousel and object carousel.

Fig. 2 illustrates the DVB service of using object carousel.

By the object carousel of DSM-CC definition is a kind of data structure of supporting from the broadcasting server connection object group that uses directory object, file object and flow object to radio receiver.In this case, real catalogue and content are arranged in server.The data broadcasting service that the support of object carousel standard is such, it requires the periodic broadcasting of DSM-CC U-U object through the radio network of compatible with DVB.Server inserts object the MPEG-2 TS of compatible with DVB repeatedly according to the object carousel agreement.The catalogue 210 and the file 220 that are sent out comprise the content of object, and the stream 230 that is sent out is other references (reference) of stream that are used to broadcast.In addition, stream 230 information that can comprise about the DSM-CC incident that in specific stream, is broadcasted.The DSM-CC incident can be broadcasted and be used to trigger the DSM-CC application program with normal stream data.A plurality of client computer realize the disguise oneself as object of client computer of the object on the server by reading the wheel multicast data that is sent out repeatedly, thereby client computer can be recovered this object and realizes.The object broadcast of wheel offers a kind of access application of client computer and the method for the content that the program that is employed is used, and it is the same to just look like that client computer is connected to server.

The data of the U-U object in the object carousel and attribute are used as message and send.Message format uses the inner ORB agreement of broadcasting (BIOP) to be described.Fig. 3 illustrates the BIOP message format.This BIOP message is made of message header 312, message paragraph header 314 and message body 316.Message header 312 provides the information about BIOP protocol version and BIOP message-length.Message paragraph header 314 comprises the information about the object that is sent out, for example, and such as the object type and the object key (object key) of file, stream and catalogue.Message body 316 comprises the data of U-U object.

BIOP message is broadcasted in data carousel modules 320.In this case, module 320 is made of the BIOP message more than one connection.Each object in a module 320 is identified by using object key.According to DSM-CC data carousel standard, each module is divided into the piece more than.These pieces are sent out as DownloadDataBlock (DDB) 330.Each DDB message is sequentially sent as a kind of MPEG-2 section 340.Piece can directly obtain from TS by the hardware filtering device that uses demultiplexer.In order to obtain an object from radio network, each comprises that the module of object should be obtained.Therefore, should obtain the transmission parameter of module, for example, module release, block size, block size, regularly and broadcast channel.Because these parameters are sent out as DownloadInfoIndication (DII) message, so DII message should be obtained prior to module.As a result, the process from radio network acquisition object comprises acquisition DII message and module.

For the object that obtains to send from broadcasting stream, DownloadServerInitiate (DSI) message is obtained, and the ServiceGatewayInfo structure that is included in this DSI message is explained.The information of group during DSI message comprises preeminent about being included in (super group).In this case, preeminent by more than one group constitute, and group constitute by module more than one.

Fig. 4 illustrates the ServiceGatewayInfo structural grammar.

Object carousel is represented particular service domain, and it is the DSM-CC U-U object in the cover DVB network.This service-domain is included as the gateway that receiver provides the chart of Service name and object name.

Client computer can be operated with reference to (IOR) 410 from the inside that ServiceGatewayInfo obtains the position of indicated object.Be included in routing object that the IOR 410 among the ServiceGatewayInfo comprises the object chart at gateway, in other words, the positional information in a service-domain.Because comprise that the module of routing object should be obtained to determine the routing object of a service-domain, so routing object (BIOP::DirectoryMessage) is obtained by sequentially obtaining DII message and DDB message.

Fig. 5 illustrates the form of BIOP::DirectoryMessage.

BIOP::DirectoryMessage comprises position, title and the attribute that is included in the object in the routing object.IOR field 510 comprises the positional information of object, and id_data_byte field 520 comprises the name information of object.ObjectKind_data field 540 comprises the value of the type that is used to distinguish message, and BIOP::DirectoryMessage has " dir " according to this value.

On the other hand, when the value of objectKind_data field 540 was " srg ", this message became the BIOP::ServiceGateway message with the information that is included in the object in the routing object.Therefore, except the value of objectKind_data field 540, BIOP::ServiceGateway message has the form identical with BIOP::DirectoryMessage.The serviceContextList_data_byte field 530 of BIOP::ServiceGateway message can comprise CORBA universal internal ORB agreement (GIOP) the code set context mechanism that comprises about the information of the transmission code collection of CORBA word string.CORBA GIOP code set context mechanism is described with reference to Fig. 7.

Fig. 6 illustrates the form of BIOP::FileMessage.

BIOP::FileMessage is the data-message that comprises true field contents.Client computer obtains desired object by carrying out a series of IOR procurement processes.

Fig. 7 is the block diagram of server 700 according to an exemplary embodiment of the present invention.

Server 700 comprises and being used for data image encoded encoder 710 and vocoder 720, multiplexer 730, RF signal processing unit 740, transport stream output unit 750 and CPU 760.710 pairs of coded image datas of image encoder and generation are provided for the image bitstream of multiplexer 730.720 pairs of voice data codings of vocoder and generation are provided for the sound bit stream of multiplexer 730.Multiplexer 730 is multiplexed in the bit stream that is encoded in image encoder 710 and the vocoder 720, and produces the transport stream of the one or more RF of being provided for signal processing units 740.Signal processing unit 740 is modulated into the signal that can be output with transport stream, and this signal is offered transport stream output unit 750.Transport stream output unit 750 sends transport stream.The operation of CPU 760 each unit of control, and produce the object carousel message such as DSI message, DII message and DDB message that will be loaded on the transport stream.When the transmission code collection that uses in object message except ISO 8859-1, CPU 760 generations comprise the BIOP::ServiceGateway message about the information of transmission code collection.

The CORBA word string that is defined within CORBA/IIOP 2.1 standards is followed in the transmission of the character string in object carousel.Based on CORBA/IIOP 2.1 standards, when not explained about the information of transmission code, the CORBA word string is followed ISO 8859-1 (ISO Latin 1) standard.Therefore, use DVB-MHP, the OCAP of object carousel and ACAP to use ISO 8859-1 standard as the basic transmission code collection that is used for filename and directory name.Like this, in order to use another kind of transmission code collection in the CORBA word string, for example UTF-8 transmission code collection requires to send the information about the transmission code collection that uses.

The character code rule that is applied to specific CORBA word string example based on following be the parameter of narrow word string (narrow string) or wide word string (wide string) about the word string example: the value of the value of narrow character transmission code set (TCS-C) and wide character transmission code collection (TCS-W), and being determined.When the value of TCS-C was unknown, the basic value of ISO 8859-1 standard was employed.When the value of TCS-W is unknown, because lack the basic value that is used for TCS-W, so will make a mistake to wide word string coding or decoding.Be IDL (IDL) expression of GIOP code set service context structure below.

Module?CONV_FRAME{

Typedef?unsigned?long?CodeSetId；

Struct?CodeSetContext{

CodeSetId?char_data；

CodeSetId?wchar_data；

}

}

According to CORBA/IIOP 2.1 standards, the value of TCS-C and TCS-W is assigned with by using GIOP code set service context.Like this, give client computer for handle about the report information of the CORBA word string transmission code collection of object carousel, the GIOP code set service context structure of CORBA/IIOP 2.1 standards can be selectively inserted into the serviceContext List_data_byte field 530 of the BIOP::ServiceGateway message of object carousel.In other words, when the transmission code collection that uses for the CORBA word string except ISO 8859-1 standard, for example during UTF-8 transmission code collection, the TCS-C value can be set to UTF-8 transmission code collection, and the TCS-W value can be set up by the serviceContextList_data_byte field 530 of undefined GIOP code set service context structure being inserted BIOP::ServiceGateway message.And, the CORBA word string of object carousel message can based on CORBA in narrow word string definition and explained.

Fig. 8 is the block diagram of client computer according to an exemplary embodiment of the present invention.

The client computer of Fig. 8 is the set-top box of data broadcasting.Set-top box 800 comprises system interface 810, demultiplexer 820, as image decoder 830 and voice decoder 840, CPU 880, memory 850, image output unit 860 and the sound output unit 870 of decoding unit.

System interface 810 receives the image/sound signal that is converted into low frequency signal, and the signal that receives is modulated into and will be launched into the image/sound signal of TV.In addition, system interface 810 produces transport stream by the image/sound signal descrambling code (descramble) to modulation, and this transport stream is sent to demultiplexer 820.Demultiplexer 820 is selected the multiplexed transport stream corresponding to the PES bag by user selected program from a plurality of Packet Elementary Stream (PES) therein by using filter.840 pairs of PES decodings of being selected by demultiplexer 820 of image decoder 830 and voice decoder convert a kind of stream that will be launched to the PES with decoding.Then, image decoder 830 and voice decoder 840 are by image output unit 860 and the broadcasting of sound output unit 870 dateouts.The voice signal of PES, decoded image signal or decoding that memory 850 storages are selected by demultiplexer 820.The operation of each unit of CPU 880 controller top boxs 800, and explain from the object carousel message of for example DSI message, DII message and the DBB message of server transmission.More particularly, when CPU 880 receives BIOP::ServiceGateway message, CPU 880 takes out information about the transmission code collection of the character string used from the BIOP::ServiceGateway message that receives object carousel message, the character string in the message is decoded corresponding to the decoder of this transmission code collection by using.

Each unit that is shown in Fig. 7 and 8 can be realized with hardware mode or software mode.

Fig. 9 is the flow chart about the method for the information of transmission code collection shared that illustrates according to exemplary embodiment of the present invention.

In operating procedure S910, server is by inserting GIOP code set service context in the serviceContextList_data_byte of BIOP::ServiceGateway message field 530, send the GIOP code set service context that comprises about the information of the transmission code collection of the CORBA word string in object carousel message, used, and client computer receives this BIOP::ServiceGateway message in operating procedure S920.In operating procedure S930, the CPU 880 of client computer takes out GIOP code set service context from BIOP::ServiceGateway message, to take out the information about the transmission code collection.In operating procedure S940, the CPU 880 of client computer, comes being included in the pathname decoding in the message by using correct character decoder according to the transmission code collection information of taking out.

Although shown particularly with reference to its exemplary embodiment and described the present invention, but what it should be appreciated by those skilled in the art is, under situation about not breaking away from, can carry out various modifications on form and the details to it by the following the spirit and scope of the present invention that claim limited.

According to equipment and the method that is used for signaling transmission code set of the present invention, thereby allow to use various language to come the named track name in the data by signaling transmission code set character coding system of pathname in transmitting about object carousel message.

Claims (3)

1, a kind of client computer via the broadcast reception data flow, this client computer comprises:

Receiver is used to receive the object carousel that comprises object, and described object comprises data and about the information of the structure of described object;

Processor is used for fetching transmission code collection information from object carousel, and wherein, transmission code collection information is provided for explaining the instruction of character string of the structure of the described object of expression; With

Decoder is used for character string is decoded, and wherein, described decoder is corresponding with transmission code collection information.

2, client computer as claimed in claim 1, wherein, object carousel is defined under ISO-IEC 13838-6 standard.

3, client computer as claimed in claim 1, wherein, character string is in the undefined CORBA word string of CORBA/IIOP.

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