CN100527834C - 处理补充数据的电视传输和接收系统及其方法 - Google Patents
处理补充数据的电视传输和接收系统及其方法 Download PDFInfo
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Abstract
一种数字电视接收器,包括:解调器,用于解调在其中将第一服务数据与第二服务数据进行了多路复用的输入信号;第一前向纠错解码器,用于对经解调的信号执行第一前向纠错,以纠正在从广播传输器接收输入信号期间发生的、在第一和第二服务数据中的错误;解多路复用器,用于从经纠错的信号中多路分解第一服务数据和第二服务数据;和第二前向纠错解码器,用于对所述第一服务数据执行第二前向纠错,以额外地纠正在接收输入信号期间发生的、在所述第一服务数据中的错误。该系统解调在其中将第一服务数据与第二服务数据进行了多路复用的输入信号,从而可以传输和接收MPEG数据和补充数据。
Description
本申请是申请日为2001年12月27日、发明名称为“具有处理补充数据的增强信号检测的残留边带接收系统”、进入中国国家阶段的专利申请号为01806707.7的发明专利申请的分案申请。
技术领域
本发明涉及数字电视收发系统及其方法,更具体地说,涉及传输并编码和接收并解码除MPEG(运动图像专家组)数据之外的补充数据的8T-VSB(残留边带)电视收发系统。
背景技术
从1995年开始,美国已经使用ATSC 8T-VSB(高级电视系统委员会8格形-残留边带)作为标准,并且,从1998年后半年开始已经采用ATSC 8T-VSB进行广播。南韩也采用ATSC 8T-VSB作为标准。南韩在1995年5月开始广播试验,并从2000年8月开始采用常规测试广播系统。技术的发展使得在在与当前由NTSC(国家电视系统委员会)使用的6MHz带宽相同的带宽内可以传输数字电视(DTV)。
图1示出了传统的ATSC 8T-VSB传输系统(“VSB传输系统”)25的方框图。VSB传输系统25通常包括数据随机化发生器1、里德-所罗门编码器2、数据交织器3、格形编码器4、多路复用器5、导频插入器6、VSB调制器7和RF转换器8。
参考图1,数据随机化发生器1用于接收和形成随机MPEG数据(视频、音频和辅助数据)。数据随机化发生器1接收从MPEG-II编码器输出的MPEG-II数据。虽然在图1中未示出,但是,MPEG-II编码器取出基带数字视频并使用离散余弦变换、游程长度编码、双向运动预测技术执行比特率压缩。然后,MPEG-II编码器将该压缩的数据与预编码音频和任何将被传输的辅助数据一起进行多路复用。结果为仅具有19.39兆比特/秒的数据频率的压缩的MPEG-II数据分组的流。MPEG-II编码器将该数据输出到串行的数据随机化发生器。MPEG-II分组具有188字节的长度,在每个分组内的第一个字节总是同步或首标字节。然后丢掉MPEG-II同步字节。在处理过程的后面的阶段,同步字节最终被ATSC段同步所替代。
在VSB传输系统25中,8-VSB比特流应当具有随机的类似噪声的信号,原因是该传输信号频率响应必须具有类似白噪声(flat noise)的频谱以便以最大的效率利用分配的6MHz频道间隔。随机数据最小化对模拟NTSC的干扰。字数据随机化发生器1中,每个字节数值随已知的伪随机数的发生的图案而改变。该过程在VSB接收器内被相反的执行,以恢复正确地数据数值。
VSB传输系统25的里德-所罗门编码器2用于对数据随机化发生器1的输出数据进行里德-所罗门编码,并在输出数据中加入20字节的奇偶校验码。里德-所罗门编码是一种用于输入数据流的前向纠错方案。前向纠错用于纠正传输期间由于信号衰落、噪声等引起的比特误差。可以采用多种技术进行前向纠错处理。
里德-所罗门编码器2取出输入MPEG-II数据分组中的所有187个字节(同步或首标字节已经从188字节中删除掉),并将其作为一个数据块进行算术操作,以创建数据块内容的数字草图。该“草图”占有20个附加字节,其加在原始的187个字节的分组的尾端。该20个字节为里德-所罗门奇偶校验字节。每个数据分组的20个里德-所罗门奇偶校验字节加入用于前向误差纠错的多至10个字节的误差/分组冗余码。由于里德-所罗门解码器校正字节误差,字节在任何地方都具有1到8比特的误差,因此,可以在VSB接收系统中实现误差纠错的大容量。里德-所罗门编码器2的输出为207字节(187加上20奇偶校验字节)。
VSB接收系统将接收的187字节数据块与20个奇偶校验字节进行比较,以确定恢复数据的有效性。如果检测出了误差,接收器可以使用奇偶校验字节定位误差的确切位置,修改损坏的字节,并重构原始信息。
数据交织器3交织里德-所罗门编码器2的输出数据。特别地,数据交织器3混乱数据分组的序列次序,并在时间上分散或延迟MPEG-II数据分组。然后,数据交织器3重编新数据分组,该新数据分组包括来自许多不同的MPEG-II(预交织)数据分组的小部分。重编分组每个为207字节。
数据交织器3的目的是防止由于噪声或其他有害传输环境的影响而丢失一个或多个分组的情况的发生。通过将数据交织到许多不同的分组中,即使完全丢失了一个分组,也可以从包含在其他分组中的信息基本恢复原始的分组。
VSB传输系统还具有格形编码器4,用于将数据交织器3的输出数据从字节形式转换为符号形式并对其进行格形编码。在格形编码器4中,从数据交织器3得到的字节被转换为符号,并被逐个地提供到格形编码器和预编码器32-1至32-12中,如图7所示。
格形编码是前向纠错的另一种形式。不同于将整个MPEG-II数据分组同时作为一个数据块进行处理的里德-所罗门编码,格形编码是扩展的编码,其在随时间进行扩展的同时跟踪正在处理的比特流。
格形编码器4将附加的冗余码添加到具有多于4个数据电平的形式的信号中,建立用于传输的多电平(8)数据符号。对于格形编码,每个8比特字节分裂为四个2-比特字的流。在格形编码器4中,每个2-比特输入字与前一个2-比特字的过去历史进行比较。3-比特二进制编码被算术生成,以描述从前一个2-比特字向当前的一个2-比特字的转换。该3-比特编码取代了原始的2-比特字,并作为8-VSB的8电平符号传输。对于输入格形编码器4的每两个比特,结果为3个比特。
在VSB接收器中的格形解码器使用接收的3-比特转换码,以从一个2-比特字到下一个2-比特字重构数据流的展开。这样,格形编码器跟随作为信号在全部时间内从一个字移动到下一个字的“轨迹”。格形编码的能力在于其能够在整个时间内跟踪信号的历史并基于信号过去和未来的状态丢弃潜在的缺陷信息(错误)。
多路复用器5用于多路复用从格形编码器4得到的符号流和同步信号。数据段和场同步信号向VSB接收器提供信息,以精确定位和解调所传输的RF信号。在随机化和误差编码阶段之后,插入数据段和场同步信号,以不破坏固定的时间和幅度的关系,这些信号必须是有效的。多路复用器5以时分方式提供从格形编码器4得到的输出和数据段以及场同步信号。
数据交织器3的输出分组包括交织的数据分组的207字节。在格形编码之后,207字节数据段被伸展为828个8电平符号的基带数据流。数据段同步信号为四个符号脉冲,其添加到每个数据段的前面,并替代了原始MPEG-II数据分组的丢失的第一字节(分组同步字节)。数据段同步信号每隔832个字符出现一次,并始终以位于+5和-5信号电平之间的正-负-正脉冲摆动的形式出现。
场同步信号是一整个数据段,其每场重复一次。场同步信号具有已知的正-负脉冲的数据信号图案,并由接收器使用,以去除由不良接收引起的信号重影。
VSB传输系统25还具有导频插入器6,用于将导频信号插入到从多路复用器5得到的符号流中。与上述同步信号相同,在随机化和误差编码阶段之后,插入导频信号,以不破坏固定的时间和幅度的关系,这些信号必须是有效的。
在数据被调制之前,向8T-VSB基带信号施加小的直流偏移。这使得小残留载波在合成的已调制频谱的零频率点处出现。这是由导频插入器6提供的导频信号。这使VSB接收器内的RF PLL电路在某种程度上可以锁定与正在传输的数据相独立的数据。
在由导频插入器6插入导频信号之后,输出到VSB调制器7。VSB调制器7将从导频插入器6得到的符号流调制为中频带的8VSB信号。VSB调制器7提供标准频率(在美国为44Mhz)下的滤波过的(平方根升余弦)IF信号,其一边带的大部分已经被去除。
特别地,八电平基带信号被幅度调制到中频(IF)载波上。调制生成关于载波频率的双边带IF频谱。总频谱太宽以至于不能在分配的6MHz信道内进行传输。
由调制产生的旁瓣是中心频谱的简单的成比例的复制,整个下边带是上边带的镜像。因此,采用滤波器,VSB调制器去除掉整个下边带和所有上边带内的旁瓣。剩余信号(中心频谱的上半段)还通过奈奎斯特滤波器进一步被去除二分之一。奈奎斯特滤波器基于奈奎斯特原理,该原理归纳出:在给定采样速率下,只需要1/2频率带宽来传输数字信号。
最后,采用了RF(射频)转换器8,用于将从VSB调制器7得到的中频带的信号转换为RF频带信号的信号,并通过天线9将信号传输到接收系统。
上述VSB通信系统至少部分地在Zenith公司的US专利No.5636251、5629958和5600677中描述,上述申请在这里被结合起来作为参考。在北美和南韩,用作标准数字电视广播的8T-VSB传输系统,被发展用于传输MPEG视频和音频数据。随着处理数字信号的技术的发展和因特网使用的增加,当前的趋势是将数字化家用设备、个人计算机和因特网集成为一个综合系统。
图2示出了ATSC 8T-VSB接收系统150(“VSB接收系统”)的现有技术。在图2中,解调器11用于接收从天线10得到的RF频带信号,并将RF频带信号转换为基带信号,同步和定时恢复(未示出)用于恢复数据段同步信号、场同步信号和符号定时。
梳状滤波器12用于去除NTSC干扰信号,信道均衡器13用于使用限幅预测器14校正失真信道。相位跟踪器15用于校正接收信号的相位,格形解码器16用于对相位校正的信号进行维特比解码。数据解交织器17用于执行与传输系统中的数据交织器3相反的操作,里德-所罗门解码器18用于解码经里德-所罗门编码信号。
VSB接收系统150进一步包括数据解随机化发生器19,用于执行与传输系统中的数据随机化发生器1相反的操作。因此,VSB接收系统150只能接收MPEG数据,不能接收补充的数据。由此,需要研制能接收补充的数据和MPEG视频以及音频数据的接收系统。另外,预测信号电平组的VSB接收系统150内的限幅预测器14的预测可靠性在过量的信道噪声或过量的重影的影响下降低。
发明内容
因此,本发明的一个目的是提供电视广播传输及其电视广播传输方法,其可以传输MPEG数据和补充数据。
本发明的另一目的在于提供电视广播接收系统及其电视广播接收方法,其可以接收MPEG数据和补充数据。本发明的附加的特点和优点将在下面的描述中进行阐明,部分可以从描述中明显的了解到,或从发明的实践中了解到。本发明的目的和其他的优点将通过说明书和其权利要求以及附图中所特别指出的结构实现和获得。
为了实现本发明的上述目的之一,提供一种数字电视接收器,该接收器包括:解调器,用于解调在其中将第一服务数据与第二服务数据进行了多路复用的输入信号;第一前向纠错解码器,用于对经解调的信号执行第一前向纠错,以纠正在从广播传输器接收输入信号期间发生的、在第一和第二服务数据中的错误;解多路复用器,用于从经纠错的信号中多路分解第一服务数据和第二服务数据;和第二前向纠错解码器,用于对所述第一服务数据执行第二前向纠错,以额外地纠正在接收输入信号期间发生的、在所述第一服务数据中的错误。
为了实现本发明的上述目的之一,还提供一种解码数字广播信号的方法,该方法包括:解调在其中将第一服务数据与第二服务数据进行了多路复用的输入信号;对经解调的信号执行第一前向纠错,以纠正在从广播传输器接收输入信号期间发生的、在第一和第二服务数据中的错误;从经纠错的信号中多路分解第一服务数据和第二服务数据;和对所述第一服务数据执行第二前向纠错,以额外地纠正在接收输入信号期间发生的、在所述第一服务数据中的错误。
为了实现本发明的上述目的之一,提供一种广播传输器,该传输器包括:第一前向纠错编码器,用于对第一服务数据执行第一前向纠错,以便在数据传输期间减少在第一服务数据中的错误;多路复用器,用于将经纠错的第一服务数据与第二服务数据进行多路复用;第二前向纠错编码器,用于对经多路复用的第一和第二服务数据执行第二前向纠错,以便在数据传输期间减少在第一和第二服务数据中的错误;以及调制器,用于调制经纠错的第一和第二服务数据以便用于传输。
为了实现本发明的上述目的之一,提供一种编码数字电视信号的方法,该方法包括:对第一服务数据执行第一前向纠错,以便在数据传输期间减少在第一服务数据中的错误;将经纠错的第一服务数据与第二服务数据进行多路复用;对经多路复用的第一和第二服务数据执行第二前向纠错,以便在数据传输期间减少在第一和第二服务数据中的错误;以及调制经纠错的第一和第二服务数据以便用于传输。
所述各技术方案通过调制或解调在其中将第一服务数据与第二服务数据进行了多路复用的信号,从而可以传输或接收MPEG数据和补充数据。
应当理解,前面的总体描述和下面的详细描述都是示范性的和解释性的,并如所要求的对本发明做进一步的解释。
附图说明
包括于此并构成说明书一部分附图提供对本发明的进一步理解,并与本发明的说明和实施例构成为一个整体用于解释本发明的原理。
图1示出了ATSC 8T-VSB传输系统的方框图;
图2示出了ATSC 8T-VSB接收系统的方框图;
图3示出了根据本发明的优选实施方式的用于数字电视广播的VSB传输系统的方框图;
图4示出了解释零序列插入的图;
图5示出了格形编码器和预编码器的方框图;
图6示出了ATSC 8T-VSB格形编码器的状态转移图;
图7示出了ATSC 8T-VSB格形编码器的功能图;
图8示出了根据本发明的优选实施方式的VSB接收系统的方框图;
图9示出了根据本发明的优选实施方式的序列发生器的方框图;
图10A示出了用于MPEG数据符号的限幅器的信号电平图;
图10B示出了用于补充数据符号的限幅器的信号电平图;和
图11示出了根据本发明的优选实施方式的信道均衡器的方框图。
具体实施方式
下面将结合附图进行举例来对本发明的优选实施方式进行详细的说明。
图3示出了根据本发明的优选实施方式的用于补充数据的和MPEG数据的传输的VSB传输器95的方框图。在图3中,VSB传输器95包括VSB补充数据处理器90和VSB传输系统25。对VSB传输系统25的描述已经在上面结合图1进行了描述,因此,就不再重复。根据本发明的优选实施方式,VSB补充数据处理器90包括里德-所罗门编码器20、数据交织器21、零序列插入器22、MPEG首标插入器23、多路复用器24、8T-VSB传输系统25和天线26。
如图3中所示,对于补充数据在信道(地面或有线电缆)内从VSB传输器95(即广播站)向VSB接收系统的传输,VSB传输器95对补充数据进行各种数字信号处理。为了提供本发明与现有设备的后向兼容性,补充数据最好为164字节分组,在进入VSB传输系统25之前,其最终被处理成为187字节分组。然而,补充数据分组的大小尺寸也可以变化,只要VSB补充数据处理器90的输出与VSB传输系统25兼容。
在VSB补充数据处理器90中,里德-所罗门编码器20用于校正误差。补充数据在里德-所罗门编码器(或R-S编码器)20内被编码。里德-所罗门编码器20最好用于对补充数据进行里德-所罗门编码并将20字节奇偶校验码加入到输出数据中。如上所述,里德-所罗门编码是一种用于输入数据流的前向纠错方式。前向纠错用于校正传输期间由于信号衰落、噪声等引起的比特误差。本领域普通技术人员所知的各种其他误差校正技术也可用作前向纠错处理。
根据优选实施方式,VSB补充数据处理器的里德-所罗门编码器20取出输入补充数据分组的164字节,并作为一个数据块对其进行算术操作,以建立数据块内容的数字草图。20个附加字节被加在原始的164个字节分组的尾端。该20个字节已知为里德-所罗门奇偶校验字节。由于VSB接收系统的里德-所罗门解码器校正字节误差,字节在任何地方都具有1到8比特的误差,因此,可以在VSB接收系统中实现相当大数量的误差纠错。里德-所罗门编码器20的输出最好为184字节(原始分组的164字节加上20个奇偶校验字节)。
VSB补充数据处理器90进一步包括数据交织器21,其交织里德-所罗门编码器20的输出数据。数据交织器21用于交织编码的补充数据,以提高抗突发噪声的性能。如果不需要提高补充数据的突发噪声特性,数据交织器21可以被省略。
根据优选实施方式的数据交织器21混乱补充数据分组的序列次序,并在时间上分散或延迟补充数据分组。然后,数据交织器21重编新数据分组,该数据分组包括来自许多不同的补充数据分组的小部分。重编分组每个最好为184字节。
如上所述,数据交织器21的目的是防止由于噪声或其他有害传输环境的影响而丢失一个或多个分组的情况的发生。通过将数据交织到许多不同的分组中,即使完全丢失了一个分组,也可以从包含在其他分组中的信息基本恢复原始的分组。然而,由于在ATSC 8T-VSB传输系统中有数据交织器,因此,如果不需要提高补充数据的突发噪声性能的情况下,用于补充数据的数据交织器可以被省略。因此,数据交织器21对于VSB补充数据处理器90不是必须的。
VSB补充数据处理器90还包括零序列插入器22,用于将零序列插入到已交织的(如果存在数据交织器21)或里德-所罗门编码的补充数据的指定区域,以在格形编码器的输入端生成用于补充数据的预定义序列(参见图1)。插入零序列使得即使在有噪声信道或多径衰落信道内VSB接收系统也可以可靠接收补充数据。由零序列插入形成的传输数据的示例结构将参考图4进行详细解释。
进一步参考图3,VSB补充数据处理器90包括MPEG首标插入器23,用于将MPEG首标加入到其中插入有零序列的补充数据中,以与传统的VSB接收系统后向兼容。由于提供到VSB传输系统25的MPEG-II数据为187字节,因此,MPEG首标插入器23最好在每个分组(184字节)的前面放置三个首标,以形成与MPEG-II数据分组长度相同的187字节分组。
添加有MPEG首标的补充数据被提供到多路复用器24。多路复用器24接收作为输入的从MPEG首标插入器23得到的补充数据和MPEG数据分组。通过不同信号通道被编码(从MPEG编码器输出)的MPEG数据分组,如广播节目(电影、体育、娱乐或戏曲),在多路复用器24与补充数据一起被一同接收。一旦接收MPEG数据和补充数据,多路复用器24就在控制器的控制下以固定比率多路复用补充数据和MPEG数据并将多路复用的数据向前传送到8T-VSSB传输系统25,该控制器定义了多路复用比和单位。
参考图1详细描述的VSB传输系统25处理多路复用的数据并通过天线26向VSB接收系统传输处理的数据。
例如,里德-所罗门编码器20使用具有数据块大小N=184、有效载荷K=164并且误差校正能力T=10的编码。另一方面,作为伽罗瓦域和里德-所罗门编码器20的生成多项式,可以使用与图1所描述的里德-所罗门编码器2相同的编码。根据优选实施方式,可以在图3所示的里德-所罗门编码器20内使用数据块大小N、有效载荷K和误差校正能力T的其他数值。例如,可以使用具有N=184、K=154和T=15的编码,或具有N=92、K=82和T=5的编码。虽然在本发明中采用了里德-所罗门编码,但是本领域普通技术人员可以采用已知的其他适合于误差校正的编码。
在VSB传输系统25中,一个数据区具有313个段:312个数据段124和一个场同步段122。312个数据段具有补充数据的数据段和MPEG数据段。每个数据段具有184字节数据、3字节MPEG首标和20字节里德-所罗门奇偶校验码。3字节MPEG首标将由VSB接收系统中的MPEG解码器使用。
下面将更加详细地描述MPEG首标的使用。ISO/IEC13818-1定义了MPEG传输分组首标。如果从MPEG传输分组首标中去除掉0x47同步字节,将剩下3字节首标。PID(节目标识)由该3个字节所定义。如果接收的分组的PID不是有效的,MPEG解码器的传输部分将丢掉分组。例如,可以使用零分组PID或其他保留的PID。因此,图2中所示的MPEG首标插入器14将包含上述PID的3字节首标插入到补充数据分组中。从而,在传统VSB接收器的MPEG解码器可以丢掉补充数据。
VSB接收系统决定接收的场数据内的MPEG数据和补充数据的多路复用位置,其与场同步信号同步。VSB接收系统基于多路复用位置解多路复用MPEG数据和补充数据。用于多路复用的MPEG数据和补充的数据的解多路复用比和方式随其中数据量的改变而改变。
可以在不同的多路复用方式和比率上加载信息,例如,92比特保留区不能用在场同步信号内。通过检索并解码该信息,VSB接收系统从包含在场同步信号内的多路复用信息识别出正确的多路复用比和方式。
或者,不仅可以在场同步信号的保留区,而且可以在补充数据的数据段内,可以插入多路复用信息。其中一个补充数据段可以用于传输由VSB接收系统所使用的多路复用信息。
图4示出了解释在图3中所示的零序列插入器22中将零序列插入补充数据以在格形编码器的输入端生成预定义序列的过程的图。
VSB传输系统在传输之前将预定义序列插入到补充数据内以提高VSB接收系统的性能。序列具有一系列以事先固定的顺序排布的“1”、“0”。“1”、“0”的数目需要平均相等。例如,预定义序列可以是伪随机序列发生器的输出,该发生器的数据初始值是事先固定的。如图4所示,一旦接收了一位补充数据,零序列插入器22就在其中插入一个零位,以提供2个数据位。零比特在图3中所示的8T-VSB传输系统中被随机化,然后进行里德-所罗门编码。编码的补充数据被交织,并作为输入d0施加到格形编码器(未示出)。输入信号d0是施加到格形编码器的两个数据位之中的较低的数据位。
图4示出了根据本发明的优选实施方式的由零序列插入器22将零序列插入补充数据的实施例。插入有零序列的补充数据传输到VSB接收系统。预定义序列具有以固定的顺序排布的多个“1”、“0”。插入到补充数据内的预定义序列可以用于提高接收系统的性能。
例如,VSB接收系统的信道均衡器使用该序列以提高补充数据和MPEG数据的重像抵消性能,格形解码器使用该序列以改进补充数据的噪声特性。如图4所示,一旦接收到一个补充数据字节,产生预定义序列的零序列插入器22就插入零比特,以提供两字节。
插入的零序列在图3中所示的VSB传输系统25中被处理,然后被传输到VSB接收系统。零序列由VSB传输系统25的数据随机化发生器1随机化,并由里德-所罗门编码器2编码。然后,零序列由数据交织器3交织,并作为输入信号D0被提供到格形编码器4。该转换的序列为预定义序列。输入信号D0是输入到格形编码器4的两个输入数据位的较低的数据位。格形编码器进行基本操作,以从两个接收的数据位提供三个数据位。
VSB接收系统产生作为从8T-VSB传输系统16内的格形编码器接收的输入信号D0的序列,即预定义序列,并使用产生的序列来提高VSB接收系统的性能。或者,本领域普通技术人员也可以采用已知的其他序列代替上述的零序列。
本发明的VSB传输器95需要具有基本上8电平出现的等可能性,以与相关技术的VSB传输系统后向兼容。因此,作为输入信号D0在格形编码器接收的序列中的“0”和“1”的出现情况要求基本上相等。
图5示出了用于图3中所示的VSB传输系统25内的格形编码器4的部件的方框图。图6示出了图5中所示的格形编码器的状态转移图。格形编码器4包括编码器28、预编码器27和调制器29。
在图5中,格形编码器28和预编码器27接收两个输入数据位D0和D1,并提供三个输出数据位C0、C1和C2。8T-VSB调制器29提供三个输出数据位C0、C1和C2的调制数值“z”。在图5中,附图标记27a和28b代表加法器,27b、28a和28c代表寄存器。
如图5中所示,输入数据位D1由预编码器27预编码为输出数据位C2。输入数据位D0与输出数据位C1相同。输出数据位C0是存储在格形编码器28的寄存器28c内的数值。信号电平由格形编码器28和预编码器27的输出比特流C0、C1和C2确定,其中,具有8个信号电平(-7、-5、-3、-1、+1、+3、+5、+7)。整个信号电平被分为两组信号电平(-7、-3、+1、+5)(-5、-1、+3、+7),每个相应于输出数据位C0具有四个电平。换句话说,每个都具有四个电平的两组信号电平(-7、-3、+1、+5)(-5、-1、+3、+7)的其中之一根据存储在寄存器28c内的数值而选定。
因此,如果有可能估算在编码器28内的寄存器28c内存储的当前值,那么,将有可能预测编码器28的输出信号电平落在两个信号电平组之一的情况。换句话说,估算编码器28内的寄存器28c的当前值意味着预测编码器28的下一个输出信号落在的两个信号电平组之一。结果,可以采用每个信号电平之间具有两倍距离的四个电平限幅器代替传统的8电平限幅器,减小了信号电平间隔。
为了估算存储在编码器28的寄存器28c内的数值,最好对VSB接收系统100的格形编码器16采用维特比算法(如图8所示)。如果在信号电平组内作出了错误预测,预测误差将变高。因此,为了最小化预测误差,传统的8T-VSB接收系统150(参见图2)在预测可靠性为高的情况下使用四电平限幅器,并/或在预测可靠性为低的情况下使用原始的8电平限幅器。
本发明通过使用从VSB传输系统传输的预定义序列显著提高了预测可靠性。用于VSB接收系统的限幅预测器和格形解码器最好都采用维特比算法。
维特比算法估算一个状态转移(或通道),其相对于时间具有最高可能性。如方程式(1)所表示的,在时间“k”时格形编码器28的状态数值为“Si”的可能性与状态数值Si的累积尺度(cumulative metric)Mi成比例。
P(Si)∝e-Mi (1)
达到时间“k”的累积尺度可以表示为方程式(2),其中,“yj”表示接收的8T-VSB信号值,“xj”表示在图6所示的状态转移中赋值给在状态之间进行连接的分支的8T-VSB信号电平值。
如图6的状态转移图所示,由于输入到格形编码器28的数据位具有两个数据位,因此,连接状态的分支的数量为四。在连接各状态S1、S2、S3和S4的四个通道中,维特比算法选择并存储具有最小累积尺度数值的通道。执行该操作的通道被称为ACS(累加/比较/选择)模块。通过从选择跟存储在各个状态S1、S2、S3和S4之内的尺度中选择具有最小数值的尺度,可以选择在时间“k”的最高可靠性的状态。
在图3所示的用于数字电视广播的VSB传输器95中,零序列被插入在补充数据内,预定义序列通过在格形编码器接收的数据位D0被传输到VSB接收系统。预定义序列在VSB接收系统中的使用最好可以显著提高维特比算法的性能。
例如,现在将讨论在时间“k”时从传输系统传输的预定义序列的数据位是“1”的情况。在这种情况下,有可能从连接状态S1、S2、S3和S4的四个分支中选择具有D1和D0为00和10的分支为最高可能性的通道。
现在将讨论预定义序列的数据位D1是“0”的情况。在这种情况下,有可能从连接状态S1、S2、S3和S4的四个分支中选择具有D1和D0为01和11的分支为最高可能性的通道。最后,预定义序列的使用使得通过采用维特比算法ACS模块将分支的数量从四减少到了二。结果,接收系统内的格形编码器的性能和限幅预测器的可靠性显著提高。
在图2所示的ATSC 8T-VSB接收系统150中,信道均衡器13和相位跟踪器15分别使用限幅器和限幅预测器14。通常,相位跟踪器内的限幅预测器14包括在格形解码器16内。
图7示出了包括在图3所示的VSB传输系统25中的ATSC 8T-VSB格形编码器4。VSB格形编码器4包括如12格形编码器和预编码器32-1到32-12、具有连接到格形编码器以及预编码器32-1到32-12的输入端的输出端的多路复用器30和具有连接到格形编码器以及预编码器32-1到32-12的输出端的输入端的多路复用器31。
图8示出了根据本发明的优选实施方式的数字VSB接收系统300的方框图,其通过使用预定义序列提高了接收性能并接收由VSB传输器传输的补充数据。
在图8中,本发明的VSB接收系统300包括:序列发生器46,用于指示补充数据的符号并产生包括在补充数据内的预定义序列;改进的传统VSB接收器100,用于以与VSB传输系统相反的顺序处理从VSB传输器95(参见图3)接收的数据。VSB接收系统300进一步包括解多路复用器56,用于将从改进的传统VSB接收器100得到的数据解多路复用为MPEG数据(已知为数据段)和补充数据(已知为数据段);以及补充数据处理器200,用于以与传输系统相反的顺序处理从解多路复用器56得到的补充数据段,以获得原始补充数据。
如图8所示,改进的传统VSB接收器100包括解调器47、梳状滤波器48、信道均衡器49、限幅预测器50、相位跟踪器51、格形解码器52、第一数据解交织器53、第一里德-所罗门解码器54、多路复用信息检测器75和数据解随机化发生器55。补充数据处理器200包括MPEG首标去除器57、零序列去除器58、第二数据解交织器59和第二里德-所罗门解码器60。
根据优选实施方式,解调器47将RF频带信号转换为基带信号,同步和定时恢复系统(未示出)恢复段同步信号、场同步信号和符号定时。梳状滤波器48在检测到NTSC干扰信号时将其去除,信道均衡器49通过使用限幅预测器50对失真信道进行校正。
相位跟踪器51校正旋转相位,格形解码器52通过使用生成的序列和维特比算法进行维特比解码。信道均衡器49、限幅预测器50、相位跟踪器51和格形解码器52通过使用在序列发生器46生成的序列处理所接收的符号。
第一数据解交织器53执行与ATSC 8T-VSB传输系统中的数据交织器相反的操作,第一里德-所罗门解码器54再次解码在ATSC 8T-VSB传输系统被里德-所罗门编码的信号。数据解随机化发生器55执行与传输系统中的数据随机化发生器相反的操作。
根据本发明的优选实施方式,序列发生器46指明接收的符号是否是补充数据,并生成与在补充数据内插入并传输的预定义序列相同的序列。
限幅预测器50是格形解码器的ACS部分。换句话说,限幅预测器50是具有解码深度0的格形解码器。限幅预测器50估算状态转移序列。在ACS操作以后,限幅预测器50估算最大可能序列,并预测下一个符号可能落入的信号电平组中的一个。
多路复用信息检测器75从信道均衡器49或格形编码器52的输出信号中检测多路复用信息。该多路复用信息包括在场同步信号或补充数据段内。
如上所述,信道均衡器49、限幅预测器50、相位跟踪器51和格形解码器52通过使用预定义序列提高了信号处理能力。考虑到在先前部件中处理的数据的延迟,这发生在使用预定义序列的部件使用具有延迟的序列信息的序列信息的情况下。
在VSB接收系统300中,解多路复用器56通过利用从如场同步信号检测到的多路复用信息将从改进的传统VSB接收器100得到的数据解多路复用为补充数据段和MPEG数据段。在优选实施方式中,第一里德-所罗门解码器54不进行补充数据段的里德-所罗门解码,而只是去除在VSB传输系统中的里德-所罗门编码器处添加的20字节奇偶校验位。
如果信道噪声过多,那么,相比补充数据,里德-所罗门编码的奇偶校验字节内将出现很多误差,因为ATSC里德-所罗门编码的奇偶校验字节没有插入预定义序列,结果在格形解码器52没有增益。第一里德-所罗门解码器54不进行补充数据段的里德-所罗门解码,因为在补充数据段具有超过如10个字节的误差的情况下,第一里德-所罗门解码器54很有可能执行错误校正。
从解多路复用器56得到的补充数据段被提供到MPEG首标去除器57。MPEG首标去除器57从补充数据段去除3字节的MPEG首标。MPEG首标在补充数据在VSB传输系统中以ATSC格式进行传输时被插入。
然后,零序列去除器58去除在VSB传输系统中的零序列插入器中插入在补充数据段中的零序列。第二数据解交织器59执行与VSB传输系统中的补充数据段的交织过程相反的操作。如果在VSB传输系统中省略了交织过程,那么,VSB接收系统300将禁用第二解交织器59或根本不包括该部件。第二里德-所罗门解码器60解码补充数据段的里德-所罗门编码。
现有技术的ATSC 8T-VSB接收系统(参见图2)的相位跟踪器15还响应限幅预测器有选择地使用其中的限幅器。本发明的VSB接收系统300的相位跟踪器51与现有技术的VSB接收系统的不同之处在于:预定义序列用在限幅器的预测和选择方面。相位跟踪器使用限幅器来校正相位误差,因此其还借助于格形解码器的限幅预测使用限幅器。相位跟踪器的限幅器的有选择的使用与均衡器的使用相同。
由于预定义序列仅插入到补充数据符号内,所以仅从VSB接收系统300需要识别补充数据符号,并确定从传输系统得到的预定义序列是“0”还是“1”。
识别在VSB接收系统300的补充数据符号和预定义序列上的信息有两种方法。在第一种方法中,一个ATSC数据帧的一场的符号被提前存储在ROM(只读存储器)中。由于ATSC 8T-VSB传输系统的数据解随机化发生器开始与场同步信号同步,因此,预定义序列的周期也在场单元内。然而,第一种方法需要大容量的存储器,因为预定义序列需要根据传输系统内的多路复用方式的被存储在场单元内。在第二种方法中,VSB接收系统具有用于生成类似于其自身的预定义序列的传输器。
图9示出了根据第二种方法的本发明的接收系统内的序列发生器46的方框图。序列发生器46包括多路复用器61、改进的随机化发生器62、伪奇偶校验码插入器63、数据交织器64和格形编码器65。多路复用器61具有提供于此的补充数据伪分组和MPEG数据伪分组。MPEG数据伪分组产生187个虚字节0x00。补充数据伪分组产生三个用于MPEG首标字节的虚字节0x00和184个用于补充数据的虚字节0xAA。这些虚字节在多路复用器61被多路复用并在改进的随机化发生器62被随机化。
改进的随机化发生器62通过有意识地将产生的伪随机字节和0x55进行如位与逻辑运算操作,并将与逻辑操作的结果和从多路复用器61得到的输入数据位进行位异或逻辑运算操作从而随机化多路复用器61的输出。然后,伪奇偶校验码插入器63将ATSC 8T-VSB传输系统的里德-所罗门编码器加入的20个奇偶校验位的虚字节0x00插入到随机化的数据。伪奇偶校验位插入器63的输出在数据交织器64被交织。格形编码器65将交织的虚字节转换为符号,每个字节生成四个符号。格形编码器65的详细描述如图7所示。
符号被提供到12格形编码器以及预编码器32-1到32-12。符号最好不被预编码和格形编码,而是随提供而向前传送。最后像这样向前传送的符号的每一个都具有两个数据位D1、D0。在这种情况下,如果数据位D1为“1”,则符号为补充数据符号,如果数据位d1为“0”,则数据位D0为MPEG数据符号。如果数据位D1为“1”,则数据位D0为提供到传输系统的格形编码器的预定义序列。序列发生器46与接收系统恢复的场同步信号同步操作。
图10A示出了用于在信道均衡器49内使用的MPEG数据符号的三种限幅器的信号电平图。每个限幅器都示出了信号电平。每个限幅器都确定与从传输系统接收的信号具有最短距离的信号。如果限幅预测的预测可靠性为低,则采用具有8电平的限幅器2。如果限幅预测的预测可靠性为高,则根据图5内所示的编码器28内的寄存器28c的估算选择限幅器2或限幅器3。如果寄存器28c估算的数值是“0”,则选择限幅器2,如果估算的数值是“1”,则选择限幅器3。
图10B示出了用于补充数据符号的六种限幅器的信号电平图。如果符号是补充数据的符号,则可以通过使用预定义序列的数据位D1使用六个限幅器。当序列数据位D0是“0”时,从VSB传输系统传输的信号电平组是(-7、-5、+1、+3)。当序列数据位D0是“1”时,从VSB传输系统传输的信号电平组是(-3、-1、+5、+7)。当限幅预测器的可靠性变差时,根据序列数据位D0的数值,选择限幅器4或限幅器5。
下面将讨论限幅预测器具有高可靠性的情况。当序列数据位D0是“0”时,则限幅器4可以根据格形编码器28的寄存器28c内存储的数值被分为两个限幅器6和7。如果存储在寄存器28c内的数值是“0”,则选择限幅器6,如果存储的数值是“1”,则选择限幅器7。
如果序列数据位D0是“1”,则限幅器5可以根据格形编码器28的寄存器28c内存储的数值被分为两个限幅器8和9。因此,如果存储在寄存器28c内的数值是“0”,则选择限幅器8,如果存储在寄存器28c内的数值是“1”,则选择限幅器9。
如上所述,可以将图10B中所示的限幅器6、7、8、9与图10A所示的现有技术中的限幅器2、3进行比较,从而发现限幅器6、7、8、9的信号距离两倍优于现有技术的限幅器2、3的信号距离。因此,在补充数据符号的情况下,每个都具有较大限幅距离的限幅器可以与预定义序列一同使用,结果降低了判定误差。
图11示出了使用预定义序列的本发明的VSB接收系统300的信道均衡器49的方框图。在图11中,信道均衡器包括前馈滤波器66、反馈滤波器67、用于将滤波器66和67的输出相加的加法器68、九个限幅器69-1到69-9、多路复用器70和控制器71。
根据优选实施方式,输入到信道均衡器49的输入信号被提供到前馈滤波器66,前馈滤波器66的输出信号和反馈滤波器67的输出信号在加法器68相加。加法器68的输出信号是信道均衡器49的输出信号。通常,信道均衡器68的输出信号被提供到九个限幅器69-1到69-9,因为限幅器69-1到69-9确定信号电平。
控制器71控制多路复用器70,以使多路复用器70选择限幅器69-1到69-9的一个输出,并提供到反馈滤波器67和控制器71。控制器71使用选择的限幅器输出和信道均衡器49的输出更新前馈滤波器66和反馈滤波器67的滤波系数。如图8所示,限幅预测器50接收信道均衡器49的输出信号和序列发生器46的输出信号,并使用接收的信号预测存储在VSB传输系统内的格形编码器28的寄存器28c内的数值。然后,限幅预测器50计算预测数值的可靠性,并将该数值向前传送到信道均衡器49的控制器71。
信道均衡器49的控制器71接收作为补充数据或MPEG数据接收的符号中的信息,以及插入在从序列发生器46得到的补充数据符号内的预定义序列D0。控制器71接收传输系统中的格形编码器28的寄存器28c的估算数值和从限幅预测器50得到的预测可靠性,并选择九个限幅器69-1到69-9其中一个输出。
如上所述,根据本发明的优选实施方式的VSB接收系统300具有下面的优点。第一,VSB接收系统具有用于处理MPEG数据和补充数据的部件。
第二,与现有技术的ATSC 8T-VSB接收系统相比,提供在VSB接收系统300内的序列发生器46(用于生成作为输入到传输系统的格形编码器的输入信号的预定义序列)可以在信道重影和噪声信号方面提高接收系统的接收性能。特别地,可以显著提高接收系统内的限幅预测器和格形编码器的性能。
第三,通过使用预定义序列,VSB接收系统300可以在信道均衡器内使用每个都具有比传统限幅器大的信号距离的限幅器和在其中使用相位跟踪器,其最小化判定误差。这提高了均衡器的跟踪消重影性能和相位跟踪器的相位跟踪性能。
在不背离本发明的实质和范围的条件下,本领域的技术人员可以容易的对本发明的VSB通信系统、VSB通信系统的信号格式作出各种改进和改变。因此,应当指出,包括对本发明的这些改进和改变都包括在本发明的附加的权利要求和其等同的范围内。
Claims (20)
1、一种数字电视接收器,该接收器包括:
解调器,用于解调在其中将第一服务数据与第二服务数据进行了多路复用的输入信号;
第一前向纠错解码器,用于对经解调的信号执行第一前向纠错,以纠正在从广播传输器接收输入信号期间发生的、在第一和第二服务数据中的错误;
解多路复用器,用于从经纠错的信号中多路分解第一服务数据和第二服务数据;和
第二前向纠错解码器,用于对所述第一服务数据执行第二前向纠错,以额外地纠正在接收输入信号期间发生的、在所述第一服务数据中的错误。
2、根据权利要求1所述的数字电视接收器,其中,所述第一前向纠错解码器包括第一里德-所罗门解码器。
3、根据权利要求2所述的数字电视接收器,其中,所述第一里德-所罗门解码器从所述第一和第二服务数据中移除奇偶校验数据。
4、根据权利要求1所述的数字电视接收器,其中,所述第二前向纠错解码器包括第二里德-所罗门解码器。
5、根据权利要求4所述的数字电视接收器,其中,所述第二里德-所罗门解码器仅仅从所述第一服务数据中移除奇偶校验数据。
6、根据权利要求1所述的数字电视接收器,其中,所述第二服务数据包括MPEG服务数据。
7、一种解码数字广播信号的方法,该方法包括:
解调在其中将第一服务数据与第二服务数据进行了多路复用的输入信号;
对经解调的信号执行第一前向纠错,以纠正在从广播传输器接收输入信号期间发生的、在第一和第二服务数据中的错误;
从经纠错的信号中多路分解第一服务数据和第二服务数据;和
对所述第一服务数据执行第二前向纠错,以额外地纠正在接收输入信号期间发生的、在所述第一服务数据中的错误。
8、根据权利要求7所述的解码数字广播信号的方法,其中,对经解调的信号执行第一前向纠错包括从所述第一和第二服务数据中移除奇偶校验数据。
9、根据权利要求7所述的解码数字广播信号的方法,其中,对所述第一服务数据执行第二前向纠错包括仅仅从所述第一服务数据中移除奇偶校验数据。
10、根据权利要求7所述的解码数字广播信号的方法,其中,所述第二服务数据包括MPEG服务数据。
11、一种广播传输器,该传输器包括:
第一前向纠错编码器,用于对第一服务数据执行第一前向纠错,以便在数据传输期间减少在第一服务数据中的错误;
多路复用器,用于将经纠错的第一服务数据与第二服务数据进行多路复用;
第二前向纠错编码器,用于对经多路复用的第一和第二服务数据执行第二前向纠错,以便在数据传输期间减少在第一和第二服务数据中的错误;以及
调制器,用于调制经纠错的第一和第二服务数据以便用于传输。
12、根据权利要求11所述的传输器,其中,所述第一前向纠错编码器包括第一里德-所罗门编码器。
13、根据权利要求12所述的传输器,其中,所述第一里德-所罗门编码器将奇偶校验数据添加到所述第一服务数据中。
14、根据权利要求11所述的传输器,其中,所述第二前向纠错编码器包括第二里德-所罗门编码器。
15、根据权利要求14所述的传输器,其中,所述第二里德-所罗门编码器将奇偶校验数据添加到所述第一和第二服务数据两者中。
16、根据权利要求11所述的传输器,其中,所述第二服务数据包括MPEG数据。
17、一种编码数字电视信号的方法,该方法包括:
对第一服务数据执行第一前向纠错,以便在数据传输期间减少在第一服务数据中的错误;
将经纠错的第一服务数据与第二服务数据进行多路复用;
对经多路复用的第一和第二服务数据执行第二前向纠错,以便在数据传输期间减少在第一和第二服务数据中的错误;以及
调制经纠错的第一和第二服务数据以便用于传输。
18、根据权利要求17所述的方法,其中,对第一服务数据执行第一前向纠错包括将奇偶校验数据添加到所述第一服务数据中。
19、根据权利要求17所述的方法,其中,对经多路复用的第一和第二服务数据执行第二前向纠错包括将奇偶校验数据添加到经复用的第一和第二服务数据中。
20、根据权利要求17所述的方法,其中,所述第二服务数据包括MPEG服务数据。
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