CN101317452B - 用于根据地面数字多媒体广播的条件存取来编码视频、音频和附加数据的设备和方法以及利用其的条件存取系统 - Google Patents

用于根据地面数字多媒体广播的条件存取来编码视频、音频和附加数据的设备和方法以及利用其的条件存取系统 Download PDF

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CN101317452B
CN101317452B CN2006800443516A CN200680044351A CN101317452B CN 101317452 B CN101317452 B CN 101317452B CN 2006800443516 A CN2006800443516 A CN 2006800443516A CN 200680044351 A CN200680044351 A CN 200680044351A CN 101317452 B CN101317452 B CN 101317452B
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CN101317452A (zh
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李勇勋
李珍焕
李光淳
安忠铉
李寿寅
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Electronics and Telecommunications Research Institute ETRI
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Abstract

提供了一种用于根据地面DMB的条件存取编码视频、音频和附加数据的设备。该设备包括：分析单元，用于分析输入流；加扰控制单元，用于根据选择信号来选择要加扰的流；传输流解多路复用单元，用于对从该分析单元接收的输入流进行解多路复用，解析由分组标识符(PID)分类的音频、视频和附加数据，并根据该加扰控制单元的选择而输出要加扰的流、不要加扰的流和要加扰的流的分组标识符(PID)；控制字生成单元，用于生成控制字；加扰单元，用于基于该控制字生成单元中生成的控制字，而对从该传输流解多路复用单元输出的要加扰的流进行加扰；条件存取数据生成单元，用于接收来自该控制字生成单元的控制字，并生成条件存取数据；和传输流再多路复用单元，用于接收来自该加扰单元的要加扰的流和来自该传输流解多路复用单元的不要加扰的流，并对它们进行再多路复用。

Description

用于根据地面数字多媒体广播的条件存取来编码视频、音频和附加数据的设备和方法以及利用其的条件存取系统
技术领域
本发明涉及地面数字多媒体广播(以下，称为“DMB”)视频服务；并更具体地，本发明涉及用于根据地面DMB的条件存取来编码地面DMB中包括的视频、音频和附加数据的设备和方法、以及利用其的条件存取系统。
背景技术
一般来说，条件存取系统(CAS)允许具有授权的数字广播接收机接收特定广播节目，并确定是否能够接收特定广播节目。
而且，条件存取系统允许具有多个服务的部分授权的接收机有条件地接收部分广播节目。
传统条件存取系统用于数字TV的有线和卫星广播。
DMB代表用于在任何地点和任何时间提供高质量音乐和图像服务的移动多媒体广播。通过Eureka-147数字音频广播(DAB)项目来完成DMB的规程的基本技术。商业DAB广播在欧洲从1995年开始，并且商业发射机和接收机的发展已经成熟。
随着与DMB相关的技术和服务的发展，各种附加服务和商业模式也增加。因此，需要传统音频广播中所不要求的新技术，并且条件存取系统是新技术的一个示例。
要在本国标准和外国标准中发布或起草的规程限制与地面DMB条件存取有关的副信道、数据组或多媒体对象传输(multimedia object transfer：MOT)模式中的条件存取。
在地面DMB的情况下，基于副信道模式执行用于DMB视频服务的条件存取。然而，还没有执行对例如视频、音频和附加数据的视频服务的每一元素的控制存取。
此外，当前地面DMB不使用在传统数字TV中使用的MPEG-2传输流(TS)的节目特定信息(PSI)的条件存取表(CAT)。当前地面DMB分析节目映射表(PMT)，解析并加扰流，用于条件存取。
其后，在地面DMB视频服务的情况下，当根据包括视频和音频的条件存取的各种附加服务生成新商业模型时，需要用于许多服务的条件存取。
因此，在作为各种地面DMB服务的示例的DMB视频服务中包括的视频、音频和数据服务有效的情况下，要求条件存取系统不用于整个DMB视频服务，而是用于视频、音频和数据服务中的每一个。
发明内容
技术问题
因此，本发明的目的是提供一种用于根据地面DMB的条件存取来编码地面DMB中包括的视频、音频和附加数据的设备和方法，以及利用其的条件存取系统，用于对地面DMB视频服务中包括的视频、音频和附加数据服务的流进行条件存取。
技术方案
根据本发明的实施例，提供了一种用于根据地面DMB的条件存取来编码视频、音频和附加数据的设备，包括：分析部件，用于分析输入流；加扰控制部件，用于根据选择信号来选择要加扰的流；传输流解多路复用部件，用于对从该分析部件接收的输入流进行解多路复用，解析由分组标识符(PID)分类的音频、视频和附加数据，并根据该加扰控制部件的选择而输出要加扰的流、不要加扰的流和要加扰的流的分组标识符(PID)；控制字生成部件，用于生成控制字；加扰部件，用于基于该控制字生成部件中生成的控制字，而对从该传输流解多路复用部件输出的要加扰的流进行加扰；条件存取数据生成部件，用于接收来自该控制字生成部件的控制字，并生成条件存取数据；和传输流再多路复用部件，用于接收来自该加扰部件的要加扰的流和来自该传输流解多路复用部件的不要加扰的流，并对它们进行再多路复用。
根据本发明的另一实施例，提供了一种用于根据地面DMB的条件存取编码视频、音频和附加数据的设备，包括：附加数据生成部件，用于生成附加数据；媒体编码部件，用于对音频数据、视频数据和该附加数据生成部件中生成的附加数据进行编码；条件存取编码处理部件，用于对该媒体编码部件中编码的音频、视频和附加数据流的所请求的流的条件存取进行编码；条件存取编码控制部件，用于从该条件存取编码处理部件接收控制信号，并向总体(ensemble)多路复用部件传送加扰信息和加扰后的流的分组标识符(PID)信息；总体分析部件，用于分析总体信息，并将分析后的总体信息传送到总体多路复用部件；控制字生成部件，用于生成控制字；加扰部件，用于根据该控制字，而对来自该总体分析部件的总体流进行加扰；同步部件，用于根据来自该总体多路复用部件的控制信号来同步条件存取编码信号，将来自该控制字生成部件的控制字输出到该加扰部件，并向该总体多路复用部件输出条件存取同步参数；条件存取消息编码部件，用于基于来自该同步部件的控制字来对条件存取消息进行编码，并将编码后的条件存取消息输出到该总体多路复用部件；和该总体多路复用部件，用于接收来自所述条件存取编码处理部件、条件存取编码控制部件、总体分析部件、加扰部件、同步部件和条件存取消息编码部件的每一信息和流，对它们进行多路复用，并生成新总体数据。
根据本发明的另一实施例，提供了一种用于根据地面DMB的条件存取编码视频、音频和附加数据的方法，包括以下步骤：分析输入流；对分析后的流进行解多路复用，并解析由分组标识符(PID)分类的音频、视频和附加数据；选择解析后的视频、音频和附加数据中的要加扰的流；根据控制字(CW)对所选择的流进行加扰；根据控制字(CW)生成条件存取数据；和对加扰后的流、未加扰的流、和条件存取数据进行再多路复用并输出。
有利效果
如上所述，本发明允许对地面DMB视频服务中包括的视频、音频和附加数据的所请求的流进行条件存取。
在根据本发明实施例的条件存取方法中，广播设备向客户机提供更高增值收费广播服务作为商业模型，并且客户机接收各种有用的高质量DMB视频服务。
附图说明
根据结合附图给出的优选实施例的以下描述，本发明的以上和其它目的和特征将变得更好理解，其中：
图1示出了根据本发明实施例的地面DMB的视频、音频和附加数据的条件存取系统；和
图2示出了根据本发明实施例的用于根据地面DMB的条件存取来编码视频、音频和附加数据的设备。
具体实施方式
其后，将参考附图更详细地描述根据本发明优选实施例的用于根据地面DMB的条件存取来编码地面DMB中包括的视频、音频和附加数据的设备和方法、以及利用其的条件存取系统。
图1示出了根据本发明实施例的地面DMB的视频、音频和附加数据的条件存取系统。
如图1所示，地面DMB的视频、音频和附加数据的条件存取系统包括附加数据发生器101、媒体编码器102、条件存取编码处理器103、条件存取编码控制单元104、总体分析单元105、加扰器106、控制字发生器107、条件存取消息编码单元108、同步单元109、和总体多路复用器110。
附加数据发生器101生成附加数据，并将生成的附加数据输出到运动画面专家组4(MPEG)-4文件。
媒体编码器102对从外部装置输入的音频和视频源以及在附加数据发生器101中生成的附加数据源进行编码。
条件存取编码处理器103根据该流的条件存取，对在媒体编码器102中编码的音频、视频和附加数据的所请求的流进行编码。
条件存取编码控制单元104从条件存取编码处理器103接收控制信号。条件存取编码控制单元104将加扰后的流的分组标识符信息(PID)和确定是否对DMB视频服务中包括的音频、视频和附加数据的每一分量进行加扰的信息传输到总体多路复用器110。
在总体分析单元105对作为总体传输流(ETI)信号从外部装置输入的总体信息进行分析之后，总体分析单元105基于控制信号经由加扰器106向总体多路复用器110传输分析后的总体信息。
加扰器106通过控制字对从总体分析单元105输入的总体流进行加扰。
控制字发生器107生成控制字(CW)，并将其输出到同步单元109。
条件存取消息编码单元108通过使用同步单元109的控制字(CW)作为编码密钥，来对条件存取的内部消息进行编码，并将编码后的条件存取的内部消息输出到总体多路复用器110。
同步单元109接收来自总体多路复用器110的控制信号，并基于与条件存取编码相关的每一块的信号来使得控制信号同步。同步单元109将来自控制字发生器107的控制字(CW)输出到条件存取消息编码单元108和加扰器106。同步单元109将条件存取同步参数输出到总体多路复用器110。
总体多路复用器110基于控制信号而接收来自条件存取编码处理部件、条件存取编码控制部件、总体分析部件、加扰部件、同步部件、和条件存取消息编码部件的每一信息和流，并进行多路复用。总体多路复用器110生成并输出新总体数据。
随后，参考图2，将在下面描述DMB视频服务的条件存取编码处理器的配置和操作。
图2示出了根据本发明实施例的用于根据地面DMB的条件存取来编码视频、音频和附加数据的设备。
如图所示，用于根据地面DMB的条件存取来编码视频、音频和附加数据的设备包括输入信号分析单元201、传输流解多路复用单元202、加扰控制单元203、加扰器204、控制字(CW)发生器205、条件存取数据发生器206和传输流再多路复用单元207。
输入信号分析单元201分析从媒体编码器102接收的流，并将分析后的流输出到传输流解多路复用单元202。
在传输流解多路复用单元202对从输入信号分析单元201接收的分析后的流进行解多路复用并对视频服务中包括的通过分组标识符(PID)分类的音频、视频和附加数据进行解析之后，传输流解多路复用单元202将加扰控制单元203所选择的流输出到加扰器204。传输流解多路复用单元202将加扰控制单元202所没有选择的其它流、以及用于加扰的流的PID信息输出到传输流再多路复用单元207。
加扰控制单元203根据广播服务操作者的选择信号而从视频服务中包括的音频、视频和附加数据中选择要加扰的流。加扰控制单元203基于控制信号将所选择的流传输到传输流解多路复用单元202。
加扰器204通过控制字(CW)对传输流解多路复用单元202中的解析后的流中的由加扰控制单元203选择的流进行加扰。
控制字发生器205生成用于操作该加扰器204的控制字(CW)。
条件存取数据发生器206从控制字发生器205接收控制字(CW)。条件存取数据发生器206生成要被授权接收机解码的例如资格(entitlement)控制消息(ECM)和资格管理消息(EMM)的条件存取数据。
传输流再多路复用单元207接收视频服务中包括的视频、音频和附加数据中的在加扰器204中加扰的数据、来自传输流解多路复用单元202的未加扰的其它流、以及来自条件存取数据发生器206的条件存取数据，并对它们进行再多路复用。传输流再多路复用单元207向总体多路复用器110输出再多路复用后的加扰数据、未加扰的流、和条件存取数据。传输流再多路复用单元207通过控制信号向条件存取编码控制单元104传输DMB视频服务的加扰信息、和要加扰的流的分组标识符(PID)信息。
下面详细描述加扰处理的实施例。
首先，如果在传输解多路复用处理中在传输流(TS)级分析PID，则对视频服务中包括的视频、音频和附加数据的流进行解析。除了视频服务中包括的三种类型流之外的其它流被排除在要加扰的对象之外。
例如，如果对视频服务的附加数据服务的流进行加扰，则在传输流(TS)级对与二进制格式场景(scene)(BIFS)相关的PID进行解析。传输流(TS)或元素流(ES)被流化，并与和PAT和PMT相关的包括剩余视频、音频、额外流的流、以及包括ECM和EMM的条件存取数据再多路复用。
其间，总体多路复用器110对从条件存取编码处理器103输入的再多路复用后的传输流和从加扰器106输入的总体流进行多路复用。地面DMB的条件存取模式包括副信道条件存取、数据组条件存取和MOT条件存取。
然而，当另外服务不同模式时，“所有权条件存取”模式包括具有“保留”模式的字段。如果在DMB视频服务中改编部分流的条件存取，则通过选择新条件模式中的字段来设置模式。当使用“保留”模式时，模式名称可改变。例如，“保留”模式在视频服务中可改变为“视频服务条件存取”模式，或者“保留”模式在附加数据服务中可改变为“附加数据服务条件存取”模式。
上述本发明的方法可通过软件程序来实现，并可存储在例如CD-ROM、RAM、ROM、软盘、硬盘、磁光盘等的计算机可读存储介质中。该处理可以由本领域普通技术人员容易地执行；并因此，这里省略其细节。
本申请包括2005年12月9日与向韩国知识产权局提交的韩国专利申请第2005-0120701号、和2006年3月7日与向韩国知识产权局提交的韩国专利申请第2006-0021476号有关的主题，通过引用在这里合并其全部内容。
尽管已针对某些优选实施例而描述了本发明，但是本领域普通技术人员将明白，可进行各种改变和变形，而不脱离以下权利要求中限定的本发明的精神和范围。

Claims (5)

1.一种用于根据地面DMB的条件存取编码视频、音频和附加数据的设备，包括：
附加数据生成部件，用于生成附加数据；
媒体编码部件，用于对音频数据、视频数据和该附加数据生成部件中生成的附加数据进行编码；
条件存取编码处理部件，用于对该媒体编码部件中编码的音频、视频和附加数据流的所请求的流的条件存取进行编码；
条件存取编码控制部件，用于从该条件存取编码处理部件接收控制信号，并向总体多路复用部件传送加扰信息和用于加扰后的流的分组标识符(PID)信息；
总体分析部件，用于分析总体信息，并将分析后的总体信息传送到总体多路复用部件；
控制字生成部件，用于生成控制字；
加扰部件，用于根据该控制字，而对来自该总体分析部件的总体流进行加扰；
同步部件，用于根据来自该总体多路复用部件的控制信号来使得条件存取编码信号同步，将来自该控制字生成部件的控制字输出到该加扰部件，并向该总体多路复用部件输出条件存取同步参数；
条件存取消息编码部件，用于基于来自该同步部件的控制字来对条件存取消息进行编码，并将编码后的条件存取消息输出到该总体多路复用部件；和
该总体多路复用部件，用于接收来自所述条件存取编码处理部件、条件存取编码控制部件、总体分析部件、加扰部件、同步部件和条件存取消息编码部件的每一信息和流，对它们进行多路复用，并生成新总体数据。
2.根据权利要求1的设备，其中该条件存取编码处理部件包括：
分析部件，用于分析从该媒体编码部件输入的流；
加扰控制部件，用于根据选择信号选择要加扰的流；
传输流解多路复用部件，用于对从该分析部件接收的分析后的流进行解多路复用，解析由分组标识符(PID)分类的音频、视频和附加数据，并根据该加扰控制部件的选择而输出要加扰的流、不要加扰的流和要加扰的流的分组标识符(PID)；
控制字生成部件，用于生成控制字；
加扰部件，用于基于该控制字生成部件中生成的控制字，而对从该传输流解多路复用部件输出的要加扰的流进行加扰；
条件存取数据生成部件，用于接收来自该控制字生成部件的控制字，并生成条件存取数据；和
传输流再多路复用部件，用于接收来自该加扰部件的要加扰的流、来自该传输流解多路复用部件的不要加扰的流和来自条件存取数据生成部件的条件存取数据，对它们进行再多路复用并输出到总体多路复用部件，并且用于向所述条件存取编码控制部件输出加扰信息和加扰后的流的分组标识符(PID)信息。
3.根据权利要求1的设备，其中该总体多路复用部件对从该条件存取编码控制部件传送的加扰后的流的分组标识符(PID)信息进行多路复用，形成并输出新条件存取模式。
4.根据权利要求3的设备，其中该总体多路复用部件通过所有权条件存取模式的字段而形成新条件存取模式。
5.根据权利要求3的设备，其中该总体多路复用部件通过保留模式的字段形成新条件存取模式。
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