CN101305609A - 数字广播发送器及其turbo流处理方法和数字广播系统 - Google Patents

数字广播发送器及其turbo流处理方法和数字广播系统 Download PDF

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CN101305609A
CN101305609A CN200680041427.XA CN200680041427A CN101305609A CN 101305609 A CN101305609 A CN 101305609A CN 200680041427 A CN200680041427 A CN 200680041427A CN 101305609 A CN101305609 A CN 101305609A
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turbo
dual transmission
transmission stream
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宋东一
丁海主
柳廷必
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Samsung Electronics Co Ltd
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Abstract

一种数字广播发送器，数字广播发送器的turbo流处理方法和具有该数字广播发送器的数字广播系统。所述数字广播发送器包括：第一压缩器，通过以第一压缩格式压缩音频和视频信号来形成普通流；第二压缩器，通过以第二压缩格式压缩音频和视频信号来形成turbo流；传输流(TS)构建器，以H.264格式压缩turbo流并通过将普通流和压缩的turbo流进行复用来形成双传输流；以及TS处理器，稳健地处理从TS构建器发送的双传输流，因此增强传输效率。

Description

数字广播发送器及其turbo流处理方法和数字广播系统
技术领域
本发明的一方面涉及一种数字广播发送器及其turbo流处理方法和具有所述数字广播发送器的数字广播系统。更具体地说，本发明的一方面涉及一种处理彼此以不同格式压缩的普通流和turbo流的数字广播发送器及其turbo流处理方法和具有所述数字广播发送器的数字广播系统。
背景技术
存在不同的数字广播标准，诸如源自美国的先进电视系统委员会(ATSC)格式和源自欧洲的手持式数字视频广播(DVB-H)。
源自美国的传输格式基于国家电视系统委员会(NTSC)频带，并且其优点在于容易实现发送器和接收器。源自美国的传输格式是单载波幅度调制残留边带(VSB)格式，也就是说，这种格式能够以单个6MHz带宽发送高质量视频、音频和辅助数据。
在源自美国的传输格式中，以运动图像专家组-2(MPEG-2)压缩图像信号，以数字音频压缩(AC-3)压缩声音和语音信号，并且使用VSB技术发送这种信号。
分别以MPEG-2和AC-3压缩图像信号以及声音和语音信号的原因在于减小图像、语音和数字辅助数据流的比特率。
在源自美国的传输格式中，用于压缩图像信号的MPEG-2已经被开发用于信道带宽或存储介质的存储容量受限制的情况和需要有效的传输结构的情况。MPEG-2是与异步传送模式(ATM)传输结构共同使用而设计的压缩格式。
发明内容
技术问题
通常，仅使用普通数据，但是，近来使用将增强编码的turbo流添加到普通流的双传输流。
在这种情况下，大大减小了以传统MPEG-2压缩的turbo流的压缩性能和图像质量。因此，增加了传输系统的负载和广播站的操作成本。
技术方案
本发明的一方面在于至少解决上述和/或其它问题和/或缺点，并且提供下面描述的优点和/或其它优点。因此，本发明的实施例的一方面在于提供一种通过以不同的格式压缩双传输流的普通流和turbo流来增强压缩性能和图像质量的数字广播发送器，及其turbo流处理方法和具有所述数字广播发送器的数字广播系统。
有益效果
能够从以上对根据本发明的实施例的数字广播发送器及其turbo流处理方法和具有所述数字广播发送器的数字广播系统的描述理解，以MPEG-2格式压缩普通流并以H.264格式压缩turbo流，使得能够在当前A-VSB系统中更加有效地使用turbo流。
因此，能够从上述系统和方法获得下面的优点：能够以较低的传输率实现相似图像质量的广播；能够以与MPEG-2格式的传输率相同的传输率实现更好图像质量的广播；以及能够以各种信道实现相似图像质量的广播。因此，能够减小广播站的操作成本并使利润最大化。
附图说明
通过下面结合附图对实施例进行的描述，本发明的上述和/或其它方面和优点将会变得明显且更加容易理解，其中：
图1是描述根据本发明的实施例的数字广播发送器的框图；
图2是描述图1的TS构建器的框图；
图3至图6是描述在图2的TS构建器中构建的H.264包的示图；
图7是描述根据本发明的实施例的数字广播发送器的turbo流处理方法的流程图；以及
图8是根据本发明的实施例的数字广播接收器的框图。
具体实施方式
现将详细参照本发明的当前实施例，其示例在附图中表示，其中，相同的标号始终表示相同的部件。以下通过参考附图描述实施例以解释本发明。
图1是描述根据本发明的实施例的数字广播发送器的框图。
参照图1，根据本发明的实施例的数字广播发送器1000包括：传输流(TS)构建器100和TS处理器200。
TS构建器100以H.264格式压缩turbo流，并且将普通流和turbo流复用以构建双传输流。将在图2中详细描述TS构建器100。
TS处理器200稳健地处理并发送从TS构建器100发送到接收器的双传输流。TS处理器200包括：随机化器201、Reed-Solomon(RS)编码器203、数据交织器205、turbo处理器207、网格编码器209、复用器(MUX)211、导频插入器213、调制器215和射频(RF)转换器217。
随机化器201对双传输流进行随机化，以最好地利用分配的信道空间。
RS编码器203对由随机化器201进行随机化的双传输流进行RS编码。RS编码器203可以为级联的编码器，将奇偶校验添加到传输流以校正传输中由于信道特性引起的差错。
数据交织器205对由RS编码器203进行了RS编码的双传输流进行交织。数据交织不改变数据，但是改变数据帧中帧的位置。
在这个实施例中，数据交织器205位于RS编码器203和turbo处理器207之间，但是没有必要限制此位置。例如，数据交织器205可位于turbo处理器207和网格编码器209之间。
turbo处理器207稳健地处理由数据交织器205交织的双传输流。更具体地说，turbo处理器207将双传输流分成普通流和turbo流，使普通流通过，对turbo流进行turbo编码，并且输出普通流和turbo编码的turbo流。
网格编码器209对在turbo处理器207中稳健处理的双传输流进行网格编码。网格编码器209将双传输流转换成符号，并且通过特定比率的网格编码执行符号映射。
MUX 211通过将段同步和场同步添加到由网格编码器209进行网格编码的双传输流来复用双传输流。
导频插入器213将导频信号插入包括由MUX 211添加的场同步和段同步的双传输流。导频信号出现在频谱的零频点，其中，将少量DC偏离提供给正好在调制之前的8-VSB基带，并且对少量残留载波进行调制，并且导频信号的作用是不考虑传输信号而使接收器的RF锁相环(PLL)电路同步。
调制器215对由导频插入器213添加了导频信号的传输流执行脉冲成型，将传送流加载到中频载波，并且执行VSB调制以对幅度进行调制。
RF转换器217对由调制器215进行了VSB调制的传输流进行RF转换并放大，并且通过分配给特定频带的信道发送传输流。
图2是描述第一压缩器和第二压缩器以及TS构建器的框图。
参照图2，在TS构建器100的前端设置第一压缩器10和第二压缩器20，并且TS构建器100包括：RS编码器120、占位符产生器130、交织器140和TS MUX 150。
第一压缩器10通过根据第一压缩格式压缩音频信号和视频信号来形成普通流，并且将普通流输入到TS构建器100。第一压缩格式可优选地是MPEG-2(运动图像专家组-2)格式。
第二压缩器20通过根据第二压缩格式压缩音频信号和视频信号来形成turbo流，并且将turbo流输入到TS构建器100。第二压缩格式可优选地是H.264格式。
H.264格式被称为先进视频编码，是用于可视信息的编码表示的标准，并且强调有效性和可靠性。另外，H.264格式压缩效率大约是MPEG-2格式的两倍(大约50％)，并且大约是MPEG-4格式的1.5倍(大约35％)。当实时压缩(诸如广播)时，性能差异在一定程度上降低，但是效率比MPEG-2格式高30-40％。
例如，为了实现SD级图像质量，在MPEG-2格式必须以4Mbps(每秒4百万比特)的比特率(数字信号的传输率)发送数据，但是在H.264格式为上述比特率的一半的2Mbps是足够的。
好的压缩效率意味着尽管在高压缩率下图像质量损失也较少。如果压缩率增加，则容量减小。因此，如果压缩性能好，则当发送较小容量的数字信号时也能实现较高的分辨率。
另外，如果能够以较小容量实现较高的分辨率，则与传输路径相应的频率被较少地使用。因此，在有限的频率资源中，由于在相同频带可使用较小的容量发送H.264格式，所以创造了额外的频率空间。因此，如果使用H.264格式，可实现更多的信道服务。
RS编码器120将奇偶校验添加到由第二压缩器20以H.264格式压缩的turbo流，并对其进行编码。
占位符产生器130产生用于将奇偶校验插入到turbo流的区，其将在TS处理器的turbo处理器207中被添加。例如，作为turbo流的构建单元的一个字节8比特被形成为一个字节4比特，从而产生两个字节。
交织器140将具有用于插入奇偶校验的区的turbo流进行交织。如果必要，可以省略交织器140，或者可以用其它元件代替交织器140。然而，如果RS编码器120包括在TS构建器100中，则可将交织器140包括在TS构建器100中。
TS MUX 150通过将输入TS构建器100的普通流和在交织器140中交织的turbo流进行复用来构建双传输流，并且输出该双传输流。
图3至图6是描述在图2的TS构建器中构建的H.264包的示图。
通常，应用于数字广播的包包括：1个字节同步、3个字节头和184个字节净荷。包的头包括包标识符(PID)。根据包括在净荷中的数据的类型分离普通流和稳健流。
图3示例性示出输入到TS构建器100的turbo流，包括净荷部分的turbo数据。也就是说，由第二压缩器20以H.264格式压缩的turbo数据被输入到TS构建器100的RS编码器120、占位符产生器130、交织器140和TS MUX150。
图4示例性示出输入到TS构建器100的普通流，普通数据被包括在净荷部分中，所述普通流还包括适配域，用于考虑与turbo流的连接而插入turbo数据。适配域包括2个字节AF头和N个字节空数据。
在TS MUX 150中，图3中的turbo流和图4中的普通流进行复用，以形成如图5的双传输流。
图6显示turbo流和普通流的不同连接形式，包完全包括turbo流或普通流。TS MUX 140以1∶3的比率排列turbo流和普通流。示例性示出以1∶3的比率排列turbo流和普通流的实施例，但是不限于此实施例。
图3至图6中的双传输流与以传统MPEG-2格式压缩的双传输流相似，但是不同之处在于：以H.264格式压缩的turbo流比普通流具有更高的效率。
图7是描述根据本发明的实施例的数字广播发送器的turbo流处理方法的流程图。
参照图1-图4，将描述根据本发明的实施例的数字广播发送器的turbo流处理方法。
第一压缩器10通过根据第一压缩格式压缩音频和视频信号来形成普通流(S300)，第二压缩器20通过根据第二压缩格式压缩音频和视频信号来构建turbo流(S310)。
通过由RS编码器120添加奇偶校验来对第二压缩器20压缩的turbo流进行RS编码(S310)，并且占位符产生器130产生将在TS处理器200中添加奇偶校验的区(S320)。
由交织器140将具有用于插入奇偶校验的区的turbo流进行交织(S330)，并且将其输入到TS MUX 150。TS MUX 150对普通流和turbo流进行复用以形成双传输流(S340)。
接下来，将双传输流输入到TS处理器200，通过随机化、RS编码、交织、turbo编码、网格编码、复用、导频插入、VSB调制和RF转换，然后通过信道被发送。
图8是根据本发明的实施例的数字广播接收器的框图。
参照图8，数字广播接收器2000包括：解调器410、均衡器420、第一处理器430和第二处理器440。
解调器410检测附于从数字广播发送器1000接收的双TS的基带信号的同步信号的同步，并且相应地执行双TS的解调。
均衡器420对解调的双TS进行均衡，并且补偿多径信道失真。由均衡器420对双TS进行均衡，接着将其提供给第一处理器430和第二处理器440。
第一处理器430处理双TS的普通流，因此恢复普通流。第一处理器430包括：viterbi解码器431、第一去交织器432、RS解码器433和第一去随机化器434。
viterbi解码器431对均衡的双TS的普通流执行纠错，对纠错的符号进行解码并且输出解码的普通流包。
第一去交织器432对解码的普通流包进行去交织，以重新排列分散的包。
RS解码器433对去交织的普通流包进行RS解码以进行纠错。
第一去随机化器434对RS解码的普通流包进行去随机化，以恢复普通流数据。
同时，第二处理器440处理双TS的turbo流以恢复turbo流数据。参照图8，第二处理器440包括：turbo解码器441、第二去交织器442、奇偶校验消除器443、第二去随机化器444、turbo解复用器445和擦除解码器446。
turbo解码器441执行均衡的双TS的turbo流的turbo解码。turbo解码器441将turbo流插回双TS，以当完成turbo解码时重建双TS。
第二去交织器442对重建的双TS进行去交织，以重排包。
奇偶校验消除器443从去交织的双TS去除奇偶校验。
第二去随机化器444对去除奇偶校验的双TS进行去随机化。
turbo解复用器445对去随机化的双TS进行解复用以恢复turbo流数据。
擦除解码器446对恢复的turbo流数据执行擦除解码。
发送器1000执行擦除编码以去除噪声，接着将turbo流插入普通流以形成双TS。因此，由于接收器2000的擦除解码器446对发送器1000的擦除编码的turbo流执行擦除解码，因此能够去除turbo流的噪声并改善接收。
图8仅是示例性示出根据本发明的实施例的数字广播接收器2000，因此不仅限于这个示例。因此，可充分地进行各种替换、修改和改变。例如，第二处理器440可仅包括turbo解码器441，而第一处理器430分别进行对普通流和turbo流的处理。
产业上的可利用性
本发明涉及一种数字广播发送器。

Claims (20)

1、一种数字广播发送器，包括：
第一压缩器，通过以第一压缩格式压缩音频和视频信号来形成普通流；
第二压缩器，通过以第二压缩格式压缩音频和视频信号来形成turbo流；
传输流(TS)构建器，以H.264格式压缩turbo流并通过将普通流和压缩的turbo流进行复用来形成双传输流；以及
TS处理器，稳健地处理从TS构建器发送的双传输流。
2、如权利要求1所述的数字广播发送器，其中，第一压缩格式包括MPEG-2(运动图像专家组-2)格式。
3、如权利要求1所述的数字广播发送器，其中，第二压缩格式包括H.264格式。
4、如权利要求1所述的数字广播发送器，其中，TS构建器包括：
RS编码器，对压缩的turbo流进行RS编码；
占位符产生器，将用于插入奇偶校验的区插入RS编码的turbo流；
交织器，将具有用于插入奇偶校验的区的turbo流进行交织；以及
TS复用器(MUX)，将交织的turbo流与普通流进行复用。
5、一种数字广播发送器的turbo流处理方法，包括：
通过以第一压缩格式压缩音频和视频信号来形成普通流；
通过以第二压缩格式压缩音频和视频信号来形成turbo流；
通过压缩turbo流并将普通流与压缩的turbo流进行复用来形成双传输流；以及
稳健地处理双传输流。
6、如权利要求5所述的turbo流处理方法，其中，第一压缩格式包括MPEG-2(运动图像专家组-2)格式。
7、如权利要求5所述的turbo流处理方法，其中，第二压缩格式包括H.264格式。
8、如权利要求5所述的方法，其中，形成双传输流的步骤包括：
对压缩的turbo流进行RS编码；
将用于插入奇偶校验的区插入RS编码的turbo流；
将具有用于插入奇偶校验的区的turbo流进行交织；以及
将交织的turbo流与普通流进行复用。
9、一种数字广播系统，包括：
发送器，通过将第一压缩格式的普通流和第二压缩格式的turbo流进行复用来构建双传输流，稳健地处理双传输流并输出稳健地处理的双传输流；以及
接收器，接收稳健地处理的双传输流并对其进行解码，并且恢复普通流和turbo流。
10、如权利要求9所述的数字广播系统，其中，第一压缩格式包括MPEG-2(运动图像专家组-2)格式。
11、如权利要求9所述的turbo流处理方法，其中，第二压缩格式包括H.264格式。
12、如权利要求9所述的数字广播系统，其中，发送器包括：
第一压缩器，通过以第一压缩格式压缩音频和视频信号来形成普通流；
第二压缩器，通过以第二压缩格式压缩音频和视频信号来形成turbo流；
TS构建器，通过将普通流和turbo流进行复用来形成双传输流；以及
TS处理器，稳健地处理从TS构建器接收的双传输流。
13、如权利要求1所述的数字广播发送器，其中，TS处理器包括：
随机化器，对双传输流进行随机化；
Reed-Solomon(RS)编码器，对由随机化器进行随机化的双传输流进行RS编码；
数据交织器，对由RS编码器进行RS编码的双传输流进行交织；
turbo处理器，稳健地处理由数据交织器进行了交织的双传输流；
网格编码器，对稳健地处理的双传输流进行网格编码；以及
复用器(MUX)，通过添加段同步和场同步对网格编码的双传输流进行复用。
14、如权利要求13所述的数字广播发送器，其中，TS处理器还包括：
导频插入器，将导频信号添加到复用的双传输流；
调制器，对添加有导频信号的双传输流执行脉冲成型，将添加有导频信号的双传输流加载到中频载波，并且执行VSB调制以调制幅度；以及
射频(RF)转换器，对由调制器进行了VSB调制的双传输流进行RF转换并放大，并且通过分配给特定频带的信道发送该传输流。
15、如权利要求12所述的数字广播发送器，其中，RS编码器是级联的编码器，将奇偶校验添加到双传输流以校正发送双传输流时引起的差错。
16、如权利要求12所述的数字广播发送器，其中，数据交织改变数据帧中帧的位置。
17、如权利要求12所述的数字广播发送器，其中，turbo处理器将双传输流分成普通流和turbo流，使普通流通过，对turbo流进行turbo编码，并且将普通流和turbo编码的turbo流进行复用并输出。
18、如权利要求12所述的数字广播发送器，其中，网格编码器将双传输流转换成符号，并且通过特定比率的网格编码执行符号映射。
19、一种数字广播系统，包括：
发送器，通过将MPEG-2(运动图像专家组-2)格式的普通流和H.264格式的turbo流进行复用来形成双传输流，稳健地处理双传输流并输出稳健地处理的双传输流；以及
接收器，接收稳健地处理的双传输流并对其进行解码，并且恢复普通流和turbo流。
20、如权利要求19所述的数字广播系统，其中，发送器包括：
第一压缩器，通过以MPEG-2(运动图像专家组-2)格式压缩音频和视频信号来形成普通流；
第二压缩器，通过以H.264格式压缩音频和视频信号来形成turbo流；
TS构建器，通过将普通流和turbo流进行复用来形成双传输流；以及
TS处理器，稳健地处理从TS构建器接收的双传输流。
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US20090060054A1 (en) 2009-03-05
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US20090097574A1 (en) 2009-04-16
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