CN102037718B - 屏蔽信号丢失的方法和装置 - Google Patents

屏蔽信号丢失的方法和装置 Download PDF

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CN102037718B
CN102037718B CN200880129375.0A CN200880129375A CN102037718B CN 102037718 B CN102037718 B CN 102037718B CN 200880129375 A CN200880129375 A CN 200880129375A CN 102037718 B CN102037718 B CN 102037718B
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马克·A·舒尔茨
罗纳德·D·约翰逊
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    • H04N21/81Monomedia components thereof
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Abstract

一种能够屏蔽信号丢失状况的方法和装置。根据示范性实施例,该方法包括以下步骤:接收信号、检测信号丢失的时段,以及使得能够连续地再现信号的接收部分并且使得跳过在该时段期间丢失的信号的部分。

Description

屏蔽信号丢失的方法和装置
相关申请的交叉引用
本申请要求于2008年3月20日向美国专利和商标局提交的、分配的序列号为61/070,074的临时申请所产生的优先权和所有权益。
技术领域
本发明一般地涉及分发和再现诸如音频和/或视频信号之类的信号的技术,并且更具体地,涉及一种用于在信号分发和再现期间屏蔽信号丢失状况(condition)的方法和装置。
背景技术
在当今社会,信号分发和再现网络已经目益普及。例如,现在经常经由移动网络在诸如巴士、火车、飞机、地铁和/或轮船上分发诸如音频和/或视频信号之类的信号。当然,还在诸如家庭和商业住宅中在静止网络中分发自线缆、地面、卫星和/或因特网资源提供的信号。移动网络和静止网络两者均易于受到信号丢失状况的影响。可能由于例如降雨衰减(rain fade)、强风、电源浪涌(power surge)、卫星视线丢失、在各个设备之间切换和/或其他事件而发生信号丢失状况。在移动网络中,信号丢失比在静止网络中更频繁出现,这是由于这些系统的运动特性而引起的。在任何情况下,由于信号丢失状况破坏了用户的收听和/或观看体验,这种信号丢失状况可能使人特别讨厌和沮丧。
相应地,存在对在信号分发和再现期间通过对信号丢失状况进行屏蔽而能够解决上述问题的方法和装置的需要。在此描述的本发明解决这些和/或其他问题。
发明内容
根据本发明的一方面,公开了一种方法。根据示范性实施例,该方法包括以下步骤:接收信号,检测信号丢失的时段,以及使得能够连续地再现信号的接收部分并且促使跳过所述时段期间丢失的信号的部分。
根据本发明的另一方面,公开了一种装置。根据示范性实施例,该装置包括:诸如用于接收包括音频和视频内容中的至少一个的信号的输入端之类的部件。诸如检测器之类的部件检测信号丢失的时段。诸如控制器之类的部件使得能够连续地再现信号的接收部分并且促使跳过所述时段期间丢失的信号的部分。
附图说明
通过结合附图参照对本发明的实施例的以下描述,本发明的上述和其他特征和优点、以及实现上述和其他特征和优点的方式将变得更清楚,并且将容易理解本发明,在附图中:
图1是根据本发明的示范性实施例的配置的图示;
图2是说明在图1的分组处理器中包括的输入侧暂停控制器的进一步细节的图示;
图3是说明在图1的分组处理器中包括的输入侧暂停控制器的进一步细节的另一图示;
图4是说明在图1的分组处理器中包括的输出侧暂停控制器的进一步细节的图示;以及
图5是说明根据本发明的示范性实施例的步骤的流程图。
在此提出的示例说明了本发明的优选实施例,并且这样的示例不应被解释为以任何方式限制本发明的范围。
具体实施方式
现在参照附图,并且更具体地参照图1,示出了根据本发明的示范性实施例的配置100的图示。为了示例和解释的目的,图1的示范性配置100表示可以用于将从卫星网络接收的包括音频和/或视频信号的信号分发到多个用户(诸如巴士、火车、飞机、地铁、轮船和/或其他移动位置上的乘客)以用于再现的系统。然而,对于本领域技术人员而言,直观地是本发明的原理还可以应用于其他类型的配置和系统,包括那些在家庭和商业住宅中的配置和系统,以及那些从其他类型的网络(例如,线缆、地面、因特网等等)接收信号的配置和系统。
如图1中所指示的,配置100包括天线10、多个卫星调谐器设备20、分组处理器30、主控制块60、切换块70和多个乘客座位80。分组处理器30包括多个缓冲器35、输入侧暂停控制器40、闪存硬盘驱动器(HDD)45、输出侧暂停控制器50,以及高速串行输出端口55。为了描述的清楚,在图1中可能没有示出诸如某些控制信号、电源信号和/或其他要素之类的与配置100相关联的某些常规的要素。
在操作中,经由天线10接收包括音频和/或视频信号的信号并且将其提供给多个卫星调谐器设备20,所述卫星调谐器设备20中的每一个执行各种已知的信号处理功能,包括调谐、模数转换、解调、前向纠错和/或其他功能,以由此向分组处理器30中的对应的一组缓冲器35提供经过流传输的数字音频和/或视频数据的分组。尽管图1的示范性配置100包括八(8)个卫星调谐器设备20,然而根据包括设计选择在内的各因素,在实际中可以改变该数目。分组处理器30可操作地执行各种数字分组处理功能。根据本发明的原理,分组处理器30可操作地检测信号丢失的时段,并且在促使跳过在信号丢失的时段期间丢失的信号的部分的同时,使得能够连续地再现信号的接收部分。
分组处理器30还使得能够在发生信号丢失状况的情况下通知用户,包括有关信号丢失时段的持续时间的通知。以此方式,分组处理器30通过使得在信号分发和再现期间能够屏蔽信号丢失状况而有助于解决之前在此描述的具体问题。随后将在此提供有关分组处理器30的操作的进一步的细节。来自分组处理器30的输出被提供给主控制块60,主控制块60用作滤波器以响应于用户输入而经由切换块70向座位80上的用户提供所请求的音频和/或视频信号。根据示范性实施例,每个座位或者每组座位80可以包括其自身的机顶盒或可操作地解码并处理所接收的音频和/或视频信号以便最终输出给一个或多个用户的其他设备、以及用户输入部件,该用户输入部件诸如键盘、遥控器、和/或用于接收诸如频道改变命令和/或其他用户命令之类的用户输入的其他输入元件。
参照图2,示出了在图1的分组处理器30中包括的输入侧暂停控制器40的进一步细节的图示。在图2中,当在块110处接收到输入串行数据分组时,它们被字节对齐并且通过额外的起始比特作标志以示出每个分组何时开始。只要在块112处发现起始标志,就在块114处将从输入时间戳计数器122提供的两个字节的时间戳数据(IN_timestamp或者(IT))添加到分组首标。如果来自系统控制块120的信号丢失(LOS)标志可应用,还可以在块114处将来自系统控制块120的信号丢失(LOS)标志添加到分组首标。随后在此将提供有关LOS标志的进一步的细节。然后在块116处将来自块114的分组存储在先入先出(FIFO)存储器中并且随后经由闪存HDD接口块118将其写入闪存HDD 45(参见图1)。
根据示范性实施例,由系统控制块120执行的软件通过使用所设置的时间间隔来构建导航表,以记录由输入时间戳计数器122生成的IN_timestamp(IT)和该数据在闪存HDD 45中起始的存储地址(参见图1)。这使得一旦定义了已知的延迟就能够非常快地访问该数据。图2还包括输出时间戳计数器124,其生成用于指示每个分组何时被写入闪存HDD 45的两个字节的输出时间戳(OUT_timestamp(OT))。输出时间戳计数器124类似于输入时间戳计数器122。这两个计数器122和124zai使用时的主要差别在于输出时间戳计数器124中的偏移用于对suo存储的数据提供实时的输出参考57(参见图1)。
参照图3,示出了在图1的分组处理器30中包括的输入侧暂停控制器40的进一步细节的另一图示。图3的图示包括与之前在上面已经描述的图2的某些块等同或者类似的多个块。在图2和图3中使用相同的附图标记来表示这些共同的块。图3的一个主要方面在于可操作地检测信号丢失的时段的LOS检测器逻辑130。如图3中所指示的,LOS检测器逻辑130包括输入间隔计数器132、LOS阈值寄存器134和比较器136。输入间隔计数器132可操作地执行计数操作以生成对应的计数值,并且在数据的每个新分组到达时被清零。LOS阈值寄存器134可操作地输出可以根据设计选择而设置的阈值。
比较器136可操作地将由输入间隔计数器132生成的计数值(即,值A)与从LOS阈值寄存器134输出的阈值(即,值B)进行比较。根据示范性实施例,当由输入间隔计数器132生成的计数值(即,值A)大于从LOS阈值寄存器134输出的阈值(即,值B)时,生成LOS标志。如之前在图2中所示的,可以从系统控制块120输出该LOS标志并且在块114处将其添加到分组首标以指示已经检测到预定义的信号丢失时段。
参照图4,示出了用于说明在图1的分组处理器30中包括的输出侧暂停控制器50的进一步细节的图示。如在图4中所指示的,在块212处经由闪存接口块210接收从闪存HDD 45读取的输入数据。当已知暂停延迟时,系统控制块120的导航表可以用于在闪存HDD 45中寻找该数据的正确的读取地址。在该时间期间,可以在没有任何中断的情况下在闪存HDD 45中存储输入数据。对来自闪存HDD 45的期望的数据进行流传输并经由输入分组字节计数器块218对其分组进行计数。如果在块214处输入数据分组被认为是新分组,则在块216处添加所设置的起始标志作为第17比特并且在提前示出(show ahead)FIFO块220中存储该分组。该类型的FIFO在下一读取周期中将该数据放置在输出总线上,使得仅仅需要读取操作来锁存FIFO数据值。这还具有非常有用的特征:只要起始比特(即,该示例中的比特17)等于“1”就允许系统控制块120看到输入时间戳(IN_timestamp)。
不从提前示出FIFO块220读取数据的新分组,直至系统控制器120将输出时间戳(OUT_timestamp)与输入时间戳(IN_timestamp)进行比较为止。当起始标志是“1”并且两个时间戳相等时,将读取下一分组。这重新创建当接收到数据时所发现的原始比特率,使得某些下游的缓冲器(未示出)将不会溢出。一旦两个时间戳值相等,则状态机块222将使能整个分组的读取操作并且然后再次停止该流程直至输入时间戳(IN_timestamp)大于或者等于输出时间戳(OUT_timestamp)为止。还是在图4中,如果在块214处检测到设置了LOS标志,则向系统控制块120通知该状况,并且作为响应,将输入时间戳(IN_timestamp)设置为等于输出时间戳(OUT_timestamp)。
上述的包括通过暂停控制器40和50体现的系统和装置的本发明能够通过屏蔽暂时的信号丢失状况并且不示出在目前的系统中所看到的空白或者冻结屏幕(frozen screen)而改进用户的观看和/或收听体验。在目前的系统中,当信号被破坏时,用户可能看见显示“信号丢失”的空白屏幕或者冻结画面。通过将暂停功能电路与包括能够检测预定义的信号丢失时段的检测器的电路进行组合,本发明能够通过使得在显示器上能够连续地再现信号的接收部分并且促使跳过在所检测的信号丢失时段期间丢失的信号的部分,从而屏蔽信号丢失状况。不是将在此描述的示范性实施例设计为恢复丢失的数据,而是能够跳过丢失的数据使得观看者/收听者将无须在几秒钟或者甚至几分钟内观看/收听预定的输出消息(例如,“信号丢失”消息)或者观看冻结画面。本发明的具有创造性的原理可以用于在发送器处或者在信号接收通路中的任何地方检测信号丢失。
在此描述的本发明公开了怎样协调至少以下特征的组合:(i)暂停或暂时存储系统,该系统可操作地将包括音频和/或视频内容的数字数据缓冲任何预定义的时间段,诸如从1-2分钟到1-2小时或者更长时间;(ii)用于检测信号是否丢失了任何预定义的时间段(包括甚至瞬时的丢失)的部件;(iii)用于使用信号丢失检测来改变暂停指针的位置以跳过丢失时间段的部件;和/或(iv)用于向观看者/收听者提供传送用于指示所检测的信号丢失状况(诸如用于指示在指定的时间段发生了信号丢失状况并且丢失了数据、但是出于便利已经跳过了该时间段)的消息的信号的部件。
在实践中,可以将体现本发明的系统设计为包括考虑许多因素,诸如所考虑的特定系统的出故障的频率和持续时间。例如,可以优选地将闪存HDD45(参见图1)的大小取为至少容纳用户(例如乘客等)正在使用该系统的典型的信号丢失时间段。此外,例如,(诸如火车、巴士和飞机上的)包括信号再现站点(site)的公共系统可以具有每个小时、或每12个小时重启的能力,这可以减少所需要的存储器(例如,图1中的闪存HDD 45)的大小。这些公共系统还可能在通告时段期间经历打断信号分发的通告。
为了向读者提供更好地理解在此描述的创造性原理及其解决的问题,现在将提供关于本发明的至少一个示范性实施例的总的操作的更详细的描述。
根据至少一个示范性实施例,该系统按照以下进行工作:系统比用户已经访问音频和/或视频内容更早地开始接收音频和/或视频内容。这意味着只要系统被复位,图1中的闪存HDD 45就激活并且开始利用在用户能够开始观看和/或收听内容之前的预先定义的时间段(例如,5分钟等)的所接收的音频和/或视频内容进行填充。注意到闪存HDD 45可以操作为用于整个服务的暂停缓冲器,或者可以包括在每个信道的基础上提供暂停特征的各个暂停缓冲器。
在闪存HDD 45正在被填充时,图3的LOS检测器逻辑130监控输入数据以检测信号丢失状况。对于几乎所有的视频服务而言,在所设置的间隔上预期某个数据率,诸如对于许多卫星信号上的视频节目为每秒3G比特,或者对于ATSC信号为每秒20G比特。诸如图3的LOS检测器逻辑130之类的信号丢失检测器可以位于传送器处或者信号接收通路中的任何位置。例如,可以在以下部分中实现这样的检测器:能够示出总的信号丢失的图1的卫星调谐器设备20、能够监控到达分组并随时间路由到达分组的分组传输多路去复用器处理器(未在图中示出)、或者检测何时由于没有新的数据到达而使数据写入缓冲器变空的系统控制块120的存储器控制器。应当在系统级上定义在实践中所使用的(多个)检测器的类型,这是由于有时候仅仅丢失许多程序中的一个程序,而在另一些时候丢失所有的程序。可以控制闪存HDD 45跳过整个系统暂停缓冲器或者跳过可能在各个程序级上存在的各个暂停缓冲器。
如之前在此所指示的,当检测到信号丢失状况时,图3的LOS检测器逻辑130生成LOS标志。由于闪存HDD 45仅仅在可得到输入信号时存储该信号,因此在信号丢失期间将不发生附加的存储。在该时间期间,没有要求来自系统控制块120的存储器写入功能的动作。系统控制块120的存储器读取功能的确需要被修改,这是由于正常时,其受时间戳控制,而现在所请求的带有时间戳的数据不可得到。如之前在图2中所指示的,分组处理器30包括提供相对时间戳的输入时间戳计数器122和输出时间戳计数器124。当发现不连续时,系统控制块120可操作用于向前跳跃到闪存HDD 45中的下一有效时间戳。在没有该特征的情况下,系统将正像其所接收的那样回放将包括信号丢失时间段的信号丢失中断。
为了示例和解释的目的,假定在音频和/或视频被输出给用户之前,闪存HDD 45正被填充了5分钟。在该示例中,假定输入时间戳(IN_timestamp)指示10分钟3秒钟,而输出时间戳(OUT_timestamp)指示5分钟3秒钟。当丢失了一分钟的输入信号时,输入时间戳(IN_timestamp)前进dvance),但是没有数据被写入闪存HDD 45。在一分钟之后,输入时间戳(IN_timestamp)现在处于11分钟3秒钟,但是在10分钟3秒钟时间标记和11分钟3秒钟时间标记之间没有发现数据。当信号恢复时,数据以具有11分钟3秒钟时间标记之后的输入时间戳的方式再次开始在闪存HDD 45中存储。输出时间计数器124继续前进并且发送出数据直到它到达10分钟3秒钟时间标记。此时,输出时间计数器124保持增加到10分钟4秒钟,但是不可得到数据,从而没有发送出任何数据直到该计数器到达11分钟3秒钟时间标记。在11分钟3秒钟时间标记处,数据将再次开始输出。由此,正是将信号丢失重放给用户。
对前述问题的解决方案至少可以包括两种不同的方法。一种方法是监控闪存HDD 45中的下一数据的输入时间戳(IN_timestamp)。如果下一输入时间戳(IN_timestamp)大于该数据的预定义的阈值(诸如1秒钟),则比较器136向系统控制块120发送LOS标志(参见图3)。在前述示例中,当输出时间戳(OUT_timestamp)应是10分钟3秒钟、但可得到的下一数据是11分钟3秒钟时,对特殊的状况做标志。当检测到该标志时,系统控制块120可以将输出时间戳(OUT_timestamp)更新为下一带时间戳的数据以允许向用户立即回放闪存HDD 45中的下一数据,而不重新创建1分钟的信号丢失。在该更新之后,系统继续正常地重现数据,但是闪存HDD 45现在仅仅提前了4分钟。如果系统信号丢失加在一起达到比暂停缓冲器起始延迟要长的时间段,则用户将看见信号丢失并且系统继续以常规的方式执行。
针对前述问题的第二方法是让LOS检测器逻辑130生成被作为标记比特或者特殊标志添加的LOS标志,其指示数据是不连续的并且需要立即改变输出时间戳计数器124的输出时间戳(OUT_timestamp)。这是更清楚的方法,但是需要时间戳首标中的附加比特。如果每个广播信道在闪存HDD 45中具有其自身的暂停缓冲器,则可以补偿在任何信道上的任何信号丢失,使得用户看不见空白的屏幕。这可能对其中在同一公共系统上可以发现本地系统和卫星系统的混合的多媒体系统是有用的,在该同一公共系统中一个信道上的信号丢失可能与其他信道完全无关。
前述的暂停特征、信号丢失检测器、以及对丢失数据的屏蔽的使用通常对消费者应用是有用的,但是可能不期望用于保安应用中。也就是说,如果保安相机(security camera)是被观看的系统的一部分,则可以显示特殊的消息以示出该信号不是实时的,或者可以提供规定来利用输出时间戳对保安相机的输入数据进行标记使得回放是立即的并且不被延迟。否则,保安相机可能屏蔽真实的行为使得观看者(例如保安人员)看不见犯罪行为。
本发明的另一方面是向用户传送屏上显示(OSD)或者其他类型的消息,以指示丢失了输入数据、但是出于用户的观看乐趣而使内容提前了。该用户通知具有多个目的:其说明了在时间参考中的瞬时变化,说明了在由于丢失了重要信息使得剩余节目没有意义的情况下的内容丢失,在保安监控的情况下通知用户数据丢失了并且对数据进行了屏蔽,以及保护(cover)操作者不受在将视频片段分片到一起时在视频和/或音频中可能出现的任何奇怪的东西(anything odd)的影响。
例如,节目可能是关于饮食方面的并列出用于健康养生的重要步骤,并且然后示出要避免和不做什么。如果丢失了片段,则用于健康养生的重要步骤可能仅仅列出要避免的项目,而没有进行任何解释。另一示例可能是来自两个不同商业广告节目(commercial)的电话号码,其中第一个商业广告节目导向一个电话号码,但是信号丢失了,而显示器错误地示出第二个商业广告节目的电话号码。此外,根据本发明的该方面,可以向用户提供用于选择是否跳过在信号丢失时段期间丢失的这部分信号的选项(例如经由OSD菜单等)。如果用户选择不跳过在信号丢失时段期间丢失的这部分信号,则利用缺省的信号来取代在信号丢失时段期间丢失的这部分信号。
如果用户正在使用个人视频记录器(PVR),则节目可能比实时的慢几分钟、几小时,或者几天。如果在存储节目期间发生降雨衰减,则在发生降雨衰减的时间段中,用户可能观看到“信号丢失”的消息或者根本没有信号。根据本发明,向用户通知丢失了某些内容,但是他或她将体验到连续的节目,而不是其中屏幕空白的受破坏的时段。
根据本发明的另一方面,如果在闪存HDD 45中不存在足够的数据,例如,缓冲器长度小于预定义的阈值,则以比正常速度慢的速度来回放数据。当缓冲器长度不小于预定义的阈值时,回放速度稍后可以返回到正常速度。例如预定义的阈值可以通过用户手动设置,或者通过系统确定缓冲器长度落在阈值之下的频率来自动地设置。根据本发明的该方面,确定在闪存HDD 45中存储的所接收的数据片段的数目,并且基于该数目调整回放或者再现速度。例如,可以进行调整使得如果该数目小于阈值,则将回放或再现速度降低到低于正常速度。相反,如果该数目等于或者大于阈值,则将回放或者再现速度保持在正常速度。
在降雨衰减的情况下,例如,10秒钟的延迟可能对于跳过降雨衰减事件是足够的。在该情形下,可以以稍微减少的速度来再现视频和/或音频直到恢复闪存HDD 45的期望的缓冲器时间。然后,如果发生信号丢失,则可以消耗缓冲器并且可以跳过信号丢失的时间段。在该事件之后,降低的回放速度可以再次出现,直到恢复期望的缓冲器时间。另外,可以查看系统的历史。如果该系统频繁地得不到充足的降雨衰减跳跃时间,则可以自动地增加期望的缓冲器时间。而且,可以基于年度(the time of year)来调整闪存HDD 45的期望的缓冲器时间。服务提供商还可以基于例如在一区域有多少正在接收的客户在抱怨或者甚至单独的客户(例如将其自己的碟形卫星天线安装在一些树下的用户,等等)来设置闪存HDD 45期望的缓冲器时间。在没有充足的缓冲时间的风险下,当接近节目的结尾时,还可以加快回放速度,使得对于紧接着的下一节目,用户将不会迟到。
参照图5,示出了图示根据本发明的示范性实施例的步骤的流程图500。图5的步骤例如可以表示被编程到分组处理器30的系统控制块120中的软件的功能。图5的步骤仅仅是示范性的,并且不是旨在以任何方式限制本发明。
在步骤510,使能用于屏蔽信号丢失状况的服务。根据示范性实施例,该服务可以在向多个用户(诸如巴士、火车、飞机、地铁、轮船和/或其他移动场所上的乘客)分发包括音频和/或视频信号的信号以用于再现的网络中得到。该服务还可以在其他网络(诸如在家庭和商业住宅中的网络)中得到。响应于对诸如图1中所示的系统之类的系统的一个或多个预定用户输入,例如可以在步骤510使能该服务。一旦在步骤510使能该服务,则数字数据开始直接向诸如图1的闪存HDD 45之类的缓冲器存储器而不是向系统用户(例如乘客等等)进行流传输。
在步骤520,提供一个或多个用户输出。根据示范性实施例,在步骤510使能该服务之后的预定的时间段(例如,5分钟、1小时等等),一个或多个系统用户开始接收再现的输出(例如,音频和/或视频输出)。该延迟允许闪存图1的HDD 45开始累积数字数据。例如可以通过以下方式在图2中使能该延迟:通过利用比输入时间戳计数器122的输入时间戳(IN_timestamp)值小对应于预定的时间段的量的输出时间戳(OUT_timestamp)值来编程输出时间戳计数器124。
在步骤530,系统监视暂停输入和信号丢失状况。根据示范性实施例,图2和图3的系统控制块120能够检测来自用户的暂停信号输入以及指示信号丢失状况的LOS标志。如果未检测到暂停信号输入,则继续将数据直接流传输到闪存HDD 45,并且稍后以延迟的方式将其提供给一个或多个用户。如果检测到暂停信号输入,则系统控制块120存储来自输出时间戳计数器124的当前的输出时间戳(OUT_timestamp)值作为暂停起始时间,并且进入暂停模式。如果检测到信号丢失状况,则进入信号丢失模式。下文将描述这两种模式。
在步骤540,暂停模式开始。根据示范性实施例,在暂停模式期间,在闪存HDD 45中存储输入数据流。此外,提供暂停输入信号的可应用的用户终端(例如机顶盒等)接收用于指示已经进入暂停模式和已经停止向用户终端流传输数据的消息。如果用户提供用于结束暂停模式的另一输入信号,则系统控制块120存储来自输入时间戳计数器122的当前的输入时间戳(IN_timestamp)值作为暂停停止时间,并且结束暂停模式。否则,暂停模式继续。
在步骤550,暂停模式结束。根据示范性实施例,当暂停模式结束时,系统控制块120查找之前存储的暂停起始时间(即,在进入暂停模式时来自输出时间戳计数器124的输出时间戳(OUT_timestamp)值)以标识在暂停起始时间开始的数据在闪存HDD 45中的地址。在暂停模式期间,输入数据照原样继续被存储。此外,在步骤550,系统控制块120利用与暂停起始时间对应的输出时间戳(OUT_timestamp)值来编程输出时间戳计数器124,并且使得来自闪存HDD 45的数据能够被流传输到(多个)用户。
在步骤560,服务丢失模式开始。根据示范性实施例,响应于系统控制块120检测到来自LOS检测器逻辑130的、指示信号丢失状况的LOS标志,服务丢失模式在步骤560开始。在服务丢失模式期间,已停止至闪存HDD 45的输入数据,但是数据继续被流传输到(多个)用户。
在步骤570,服务丢失模式结束。根据示范性实施例,当LOS检测器逻辑130检测到信号已经恢复(return)时,服务丢失模式在步骤570结束。一旦这个发生,则系统控制块120在被发送给闪存HDD 45的首先恢复的数据分组中设置LOS标志。此外,继续将数据流传输到闪存HDD 45和(多个)用户。
在步骤580,回放屏蔽模式开始。根据示范性实施例,当从闪存HDD 45提供的数据分组中检测到所设置的LOS标志时,系统控制块120针对该分组将输出时间戳(OUT_timestamp)设置得等于输入时间戳(IN_timestamp)(参见图4)。这使得开始回放屏蔽模式,使得数据再现将跳过信号丢失时段并且将继续向(多个)用户再现音频和/或视频。此外,在回放屏蔽模式期间,(例如经由OSD消息等)通知(多个)用户丢失了输入信号的某些部分。还可以向(多个)用户告知信号丢失时段的持续时间。
在步骤590,回放屏蔽模式结束。根据示范性实施例,回放屏蔽模式的结束使得系统通过使用输出时间戳(OUT_timestamp)从闪存HDD 45读取数据而继续正常的操作、从而在合适的时间输出数据分组。该正常操作继续直到检测到暂停输入信号或者信号丢失状况。如果检测到暂停输入信号,则如之前在此所述的,进入暂停模式。如果检测到信号丢失状况,则如之前在此所述的,进入信号丢失模式。只要用于屏蔽信号丢失状况的服务被使能(参见步骤510),则前述的操作继续。
如在此所述的,本发明提供了一种在信号分发和再现网络中屏蔽信号丢失状况的方法和装置。尽管本发明已经被描述为具有优选的设计,但在本公开的精神和范围内可以进一步修改本发明。因此,本申请旨在覆盖使用本发明的一般原理的、本发明的任何变型、使用,或者适配。另外,本申请旨在覆盖进入本发明所属技术领域的已知的或惯常的实践并且落入所附权利要求的限制的那些偏离方式。

Claims (11)

1.一种屏蔽信号丢失状况的方法,包括以下步骤:
接收包括多个片段的信号,每个片段包括起始指示;
在检测到所接收的片段的所述指示时,向所接收的片段插入输入时间戳;
将每个所接收的片段与相关联的输入时间戳存储在存储器中;
响应于检测到所述信号丢失的时段而在存储器中存储丢失指示,其中紧接在所述信号丢失的时段已经结束之后将所述丢失指示添加到要存储在所述存储器中的第一片段;以及
根据输出时间戳从所述存储器中取出所存储的片段,以及如果所取出的片段包括所存储的丢失指示,则将所述输出时间戳设置为包括所存储的丢失指示的所取出的片段的所述输入时间戳,使得实现所述信号的继续回放,绕过所述信号丢失的时段。
2.根据权利要求1所述的方法,还包括以下步骤:在取出丢失指示时向用户通知丢失了所述信号的某个部分。
3.根据权利要求1所述的方法,还包括步骤:
当取出丢失指示时,使得用户能够选择是否跳过在所述时段期间丢失的所述信号;以及
如果所述用户选择不跳过在所述时段期间丢失的所述信号,则所述取出步骤包含利用缺省信号来替换在所述时段期间丢失的所述信号。
4.根据权利要求1所述的方法,其中所述信号包含音频内容和视频内容中的至少一个。
5.根据权利要求1所述的方法,还包括以下步骤:
确定在所述存储器中存储的所述所接收的片段的数目;以及
根据所述数目在所述回放步骤期间调整再现速度。
6.根据权利要求5所述的方法,其中所述调整步骤包含以下步骤:
如果所述数目小于阈值,则将所述再现速度降低到低于正常速度;以及
如果所述数目等于或大于所述阈值,则将所述再现速度保持在所述正常速度。
7.一种屏蔽信号丢失状况的装置,包括:
用于接收包括多个片段的信号的部件,每个片段包括起始指示;
用于在检测到所接收的片段的所述指示时向所接收的片段插入输入时间戳的部件;
用于将每个所接收的片段与相关联的输入时间戳存储在存储器中的部件;
用于响应于检测到所述信号丢失的时段而在存储器中存储丢失指示的部件,其中紧接在所述信号丢失的时段已经结束之后将所述丢失指示添加到要存储在所述存储器中的第一片段;以及
用于根据输出时间戳从所述存储器中取出所存储的片段、以及如果所取出的片段包括所存储的丢失指示则将所述输出时间戳设置为包括所存储的丢失指示的所取出的片段的所述输入时间戳使得实现所述信号的继续回放、绕过所述信号丢失的时段的部件。
8.根据权利要求7所述的装置,还包括:用于在取出丢失指示时向用户通知丢失了所述信号的某个部分的部件。
9.根据权利要求7所述的装置,还包括:
用于使得用户能够选择是否跳过在所述时段期间丢失的所述信号的部件;以及
如果所述用户选择不跳过在所述时段期间丢失的所述信号,则利用缺省信号来替换在所述时段期间丢失的所述。
10.根据权利要求7所述的装置,其中根据在所述存储器中存储的所述所接收的片段的数目在所述回放期间调整再现速度。
11.根据权利要求10所述的装置,其中:
如果所述数目小于阈值,则将所述再现速度降低到低于正常速度;以及
如果所述数目等于或大于所述阈值,则将所述再现速度保持在所述正常速度。
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EP2253135A1 (en) 2010-11-24
KR20100129743A (ko) 2010-12-09
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US20100329637A1 (en) 2010-12-30
US20100333164A1 (en) 2010-12-30
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WO2009116976A3 (en) 2009-11-19
WO2009116976A2 (en) 2009-09-24
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BRPI0822345A2 (pt) 2015-06-16
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US20110023079A1 (en) 2011-01-27
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