CN100539506C - Network managed channel change in digital networks - Google Patents

Network managed channel change in digital networks Download PDF

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Publication number
CN100539506C
CN100539506C CN 200580041922 CN200580041922A CN100539506C CN 100539506 C CN100539506 C CN 100539506C CN 200580041922 CN200580041922 CN 200580041922 CN 200580041922 A CN200580041922 A CN 200580041922A CN 100539506 C CN100539506 C CN 100539506C
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stream
channel change
normal stream
circuit
picture element
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CN 200580041922
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Chinese (zh)
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CN101073223A (en )
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库马尔·拉马斯瓦米
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汤姆逊许可公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. local area networks [LAN], wide area networks [WAN]
    • H04L12/2801Broadband local area networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/231Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
    • H04N21/23106Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion involving caching operations
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234Processing of video elementary streams, e.g. splicing of content streams, manipulating MPEG-4 scene graphs
    • H04N21/2343Processing of video elementary streams, e.g. splicing of content streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
    • H04N21/234345Processing of video elementary streams, e.g. splicing of content streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements the reformatting operation being performed only on part of the stream, e.g. a region of the image or a time segment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a Uniform Resource Locator [URL] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2365Multiplexing of several video streams
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/434Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4347Demultiplexing of several video streams
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/438Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4383Accessing a communication channel, e.g. channel tuning
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/438Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4383Accessing a communication channel, e.g. channel tuning
    • H04N21/4384Accessing a communication channel, e.g. channel tuning involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/60Selective content distribution, e.g. interactive television, VOD [Video On Demand] using Network structure or processes specifically adapted for video distribution between server and client or between remote clients; Control signaling specific to video distribution between clients, server and network components, e.g. to video encoder or decoder; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
    • H04N21/61Network physical structure; Signal processing
    • H04N21/6106Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/60Selective content distribution, e.g. interactive television, VOD [Video On Demand] using Network structure or processes specifically adapted for video distribution between server and client or between remote clients; Control signaling specific to video distribution between clients, server and network components, e.g. to video encoder or decoder; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
    • H04N21/65Transmission of management data between client and server
    • H04N21/658Transmission by the client directed to the server
    • H04N21/6581Reference data, e.g. a movie identifier for ordering a movie or a product identifier in a home shopping application

Abstract

本发明提供了一种用于在数字网络中进行频道改变的电路与相应的方法。 The present invention provides a circuit and corresponding method for enabling a channel change in a digital network. 该电路包括用于接收频道改变流与常规流的输入端。 The circuit comprises an input terminal for receiving a channel change stream and a normal stream. 该电路还包括多路复用器,存储装置,和图像元素检测器。 The circuit further comprises a multiplexer, a storage device, and an image element detector. 该多路复用器用于响应来自用户端设备(CPE)装置的频道改变请求,向CPE装置发送频道改变流。 The multiplexer in response to a channel from the customer premises equipment (CPE) device change request, changing the flow channel transmitted to the CPE device. 该存储装置用于储存响应于来自CPE装置的频道改变请求而设置的标记。 The memory means for storing in response to a channel change request from the CPE device is provided indicia. 该标记被设置用于请求检测常规流中的图像元素。 The request flag is set for detecting the picture element in the normal stream. 该图像元素检测器用于在传送频道改变流之后检测常规流中的图像元素。 The image element detector for detecting the picture element in the normal stream after transmitting the channel change stream. 一旦在常规流中检测到图像元素,多路复用器就向CPE装置传送常规流以取代频道改变流。 Upon detecting the picture element in the normal stream, the multiplexer transmits the normal stream to the CPE device in place of the channel change stream.

Description

数字网络中的网络控制的频道改变 Network control channel change in a digital network

相关申请的交叉引用 Cross-Reference to Related Applications

本申请主张2004年12月6日提交的申请号为60/633,475的美国临时申请的优先权,其内容全部引用在此。 This application claims priority No. 2004, filed on December 6 for the benefit of US Provisional Application 60 / 633,475, the entire contents of which are hereby.

技术领域 FIELD

本发明一般涉及数字网络,尤其涉及一种能在数字网络中进行频道改变的方法与设备。 The present invention relates generally to digital networks, and particularly to a method and apparatus capable of channel change in a digital network.

背景技术 Background technique

在数字用户线(DSL)组播/广播视频系统中,可以用网络协议(IP)组播将压縮视频传送至一机顶盒(STB)。 Digital Subscriber Line (DSL) multicast / broadcast video system, it can be a network protocol (IP) multicast the compressed video to a set top box (STB). 网络组管理协议(IGMP)是用于选择观看哪个频道的机制,其通过将所需频道的加入请求发送至数字用户线访问多路复用器(DSLAM)来实现。 Internet Group Management Protocol (IGMP) is a mechanism for selecting which channel to watch, which is achieved by adding the desired channel request is sent to the digital subscriber line access multiplexer (DSLAM). 当不再想收看该频道时,可发送一退出请求至DSLAM。 When no longer want to watch the channel, it may send a request to exit the DSLAM.

在依托于DSL广播系统的商业视频中,希望能允许终端用户快速地改变频道。 In relying on the DSL business video broadcasting system, hoping to allow end users to quickly change channels. 一般的图像压缩标准,诸如MPEG-2和JVT/H. 264/MPEG AVC等,使用帧内和帧间编码。 General image compression standards, such as MPEG-2 and JVT / H. 264 / MPEG AVC, etc., use intra and inter coding. 为了正确解码,解码器必定对以帧内编码(I)图像或即时解码刷新(IDR)图像或是一段I帧片段开头的压缩视频序列进行解码,然后继续对后续的帧间编码(P和B)图像进行解码。 In order to properly decode, the decoder must be intra-coded (I) picture or Instantaneous Decoding Refresh (IDR) picture or I frame period at the beginning of segment decoding compressed video sequence, and then continue the subsequent inter-coded (P and B ) decode an image. 一个图像组(GOP)可包括至少一个I帧图像和至少一个P和/或B帧图像。 A group of pictures (GOP) may include at least one I-frame image and at least one P and / or B-frame image. 就相同的图像质量来说,帧内编码(I)图像比帧间编码(P和B)图像需要更多的数位来进行编码,通常在3~10倍的数位范围内。 On the same image quality, the intra-coded (I) images require more bits than the number of inter-coded (P and B) to be encoded, the number of bits in the range of usually 3 to 10 times.

当接收器开始接收一个特定频道的节目时,在改变频道之后或在接收器最初启动时,接收器必须等收到一个I帧图像之后才能幵始正确解码,这就引起了延迟。 When the receiver starts to receive a specific channel program, after changing the channel or when the receiver is first started, the receiver must wait after receiving an I-frame image to starts its correct decoding, which caused a delay.

为了使数字视频广播系统中的频道改变延迟最小化,通常频繁地传送I帧 In order to make a channel change in a digital video broadcasting system to minimize delays, usually an I frame transmitted frequently

图像,例如每N个图像一次。 Image, for example, once every N images. 举例来说,为使系统中视频压缩部分有1/2秒的延迟,对30帧/秒的内容来说一般需要N-15。 For example, to make the video compression portion of the system with a delay of 1/2 second, the content of 30 frames / sec is generally required N-15. 由于压缩的I帧图像比压缩的P 和B帧图像大的多,如果I帧图像不被如此频繁地插入,比特率将明显的增加而超过所要求的。 Because compressed I-frame image is larger than compressed P and B frames of the multi-picture, if an I-frame image is not inserted so frequently, the bit rate increases significantly exceeds the claims.

在第一种现有技术的系统中,频道改变流被编码并与常规的视频比特流一起传送。 In a first prior art system, the channel change stream is encoded and transmitted together with a conventional video bitstream. 频道改变流中包含低质量的I帧图像,以高于常规流中的I帧图像的频率传送。 Channel change stream I frame included in the image of low quality, higher than the frequency of the transmission frame of a conventional image stream I. 当用户转换到新的频道时,可在收到常规或频道改变流的第一组I 帧图像时开始播放。 When a user switches to a new channel, you may receive or play back from a conventional first set of channel change stream I picture frame.

在第二种现有技术的系统中,对于每种节目,在常规编码流之外,也对相对较低的比特率、低分辨率的频道改变流进行了编码。 In the second prior art system, for each program, in addition to the normal stream coded, also relatively low bit rate, low resolution channel change stream is encoded. 当用户端设备(CPE)接收到频道改变请求时,在新选的节目的频道改变流与常规流中都做出加入请求,并将这两种流下行发送到DSL链路。 When the Customer Premises Equipment (CPE) a channel change request is received, the newly selected program channel change stream and the normal stream are added to make a request, and sends both to the flow line DSL link. 然后CPE从频道改变流适当地转换到常规流。 The CPE then suitably converted stream from the channel change to the normal stream.

因为在上述第二种现有技术方案中,当频道改变请求提出时,要同时将常规与频道改变流传送至DSL链路,这就将导致带宽增加,直至CPE在频道改变流上发出"退出,,请求。例如,转到高清晰频道的用户会引起低分辨率(可能是标准清晰度)频道的使用带宽的增加。 Because the above-described second prior art embodiment, when a channel change request is made, while to the conventional DSL link to the channel change stream, this will lead to increased bandwidth until the CPE change "opt out on the flow in the channel ,, request. For example, a user to cause the high-definition channel resolution (standard definition may be) used to increase the bandwidth of the channel.

因此,克服现有技术中的上述问题,获得一种新的技术和设备以达到数字网络中的频道改变,是非常必要和有价值的。 Thus, to overcome the above problems of the prior art, to obtain a new technology and equipment in order to achieve a channel change in a digital network, it is very necessary and valuable. 发明内容 SUMMARY

本发明克服了现有技术中的缺陷与不足,提供了一种用于在数字网络中进行频道改变的方法和设备。 The present invention overcomes the shortcomings and deficiencies of the prior art, a method and apparatus for enabling a channel change in a digital network.

根据本发明的一个方面,提供了一种用于在数字网络中进行频道改变的电路。 According to one aspect of the invention, there is provided a circuit for enabling a channel change in a digital network. 该电路具有用于接收频道改变流与常规流的输入端。 The circuit has an input terminal for receiving a channel change stream and a normal stream. 该电路还包括多路复 The circuit further includes a multiplexing

用器,存储装置和图像元素检测器。 Appliances, storage apparatus and the image element detector. 该多路复用器用于响应于来自CPE装置的频道改变请求,将频道改变流传送至CPE装置。 The multiplexer in response to a channel change request from the CPE device, the channel change stream to the CPE device. 该存储装置用于储存响应于来自CPE装置的频道改变请求而设置的标记。 The memory means for storing in response to a channel change request from the CPE device is provided indicia. 该标记被设置用于请求检测常规流中的图像元素。 The request flag is set for detecting the picture element in the normal stream. 该图像元素检测器用于在传送频道改变流之后,捡测常规流中的图像元素。 The image element detector is used after the transmission of the channel change stream, pick test picture element in the normal stream. 一旦在常规流中检测到图像元素,多路复用器就会发送常规流至CPE装置以替代频道改变流。 Upon detecting the picture element in the normal stream, the multiplexer will send the normal stream to the CPE device in place of the channel change stream.

根据本发明的另一个方面,提供了一种在连接数字网络并具有用于接收频道改变流与常规流的输入端的电路中,用于在数字网络中进行频道改变的方法。 According to another aspect of the invention, there is provided a digital network connection in the circuit and having a flow stream of the conventional input terminals, a method for receiving a channel change for a channel change in a digital network. 该方法包括响应于来自用户端设备(CPE)装置的频道改变请求,将频道改变流传送至CPE装置的步骤。 The method includes, in response to the channel (CPE) device change request from the CPE, the CPE device stream to the step of changing the channel. 该方法还包括响应于来自CPE装置的频道改变请求设置标记,以请求在常规流中捡测图像元素的步骤。 The method further includes, in response to a channel change request from the CPE device sets a flag to request the step of sensing the image pick up element in the normal stream. 该方法还包括在传送频道改变流之后,检测常规流中的图像元素的步骤。 The method further includes after transmitting the channel change stream, the step of the image elements detected in the normal stream. 此外,该方法还包括一旦在常规流中检测到图像元素,就将常规流传送至CPE装置以替换频道改变流的歩骤。 In addition, the method further comprises upon detecting the picture element in the normal stream, the stream to the CPE device will be a conventional channel change stream to replace the step of ho.

根据以下结合附图可以读到的示例性实施例的具体描述,本发明的上述以及其他方面、特征,和优点将会更加明显。 The detailed description of exemplary embodiments in conjunction with the following figures can be read, the above and other aspects, features, and advantages of the present invention will become more apparent.

附图说明 BRIEF DESCRIPTION

结合以下附图可以更好地理解本发明,其中-图1所示为根据本发明原理的端到端结构的示意框图;以及 The following figures of the present invention may be better understood, where - is a schematic block diagram illustrating end structure according to principles of the present invention shown in FIG. 1; and

图2所示为根据本发明原理的数字用户线(DSL)系统中进行频道改变的方法的流程图。 A method for channel change according to the principles of the present invention, a digital subscriber line (DSL) system in the flowchart shown in FIG.

具体实施方式 detailed description

本发明涉及在数字网络中进行频道改变的方法和设备。 The present invention relates to a method and apparatus for channel change in a digital network.

有利的是,本发明在上述第一和第二种现有技术系统的基础上进行了改进,克服了以上所描述的相关缺陷。 Advantageously, the present invention improves upon the above-described first and second prior art system overcomes the problem related defects described above. 例如,本发明降低了数字用户线(DSL)系统中由用户端设备(CPE)发起的、低延迟的频道改变机制的带宽消耗。 For example, the present invention reduces the digital subscriber line (DSL) system, initiated by the customer premises equipment (CPE), the bandwidth consumed by the low delay channel change mechanism. 根据本发明的原理,由CPE发出频道改变请求。 According to principles of the present invention, a channel change request issued by the CPE. 数字用户线接入多路复用器(DSL認) (或另一些上行设备),响应于该请求,转换至低分辨率频道改变流,并且在适当的时机,转换至全分辨率流。 Digital subscriber line access multiplexer (DSL recognition) (or other upstream apparatus), in response to the request, the conversion to the low resolution channel change stream, and at an appropriate time, converting to the full-resolution stream.

可以理解的是,在此所用的"用户端设备(CPE)"与"机顶盒(STB)" 等术语是可互换的。 It will be appreciated that in the "customer premise equipment (the CPE)" as used herein and "STB (the STB)" and like terms are interchangeable. 术语"无记忆图像元素"指的是依赖前一个或后一个图像元素的当前图像元素。 The term "memoryless picture element" refers to a front or a rear-dependent current image elements in the image element. 另外,可以进一步理解的是,术语"I帧图像"和"无记忆图像元素"在此可互换使用以指代任何I帧片段,即时解码刷新(IDR)图像, 或者I帧图像。 Further, it is further understood that the term "I frame image" and "memoryless picture element" are used interchangeably herein to refer to any fragment of an I-frame, instantaneous decoder refresh (IDR) picture, or I picture frame.

此外,可以理解的是,虽然本发明主要描述了关于数字网络的一个特定例子,即用户数据线(DSL)网络,但根据发明在此提供的教导,本领域的普通技术人员,可以容易地将本发明应用到任何可转换的数字网络中去,而仍然保留在本发明的范围内。 Further, it is understood that although the present invention is primarily described with a specific example of a digital network, i.e., user data line (DSL) network, but according to the teachings of the disclosure provided herein, those of ordinary skill in the art can readily the present invention is applicable to any digital network to be converted, while still remaining within the scope of the present invention.

本说明书阐述了本发明的原理。 The description sets forth the principles of the invention. 因而,可认为本领域技术人员能够据此做出各种设置,这些设置虽没有明确描述或体现,但具体实施了发明,并且包含于其精神和范围内。 Thus, it is believed the skilled in the art to make various settings accordingly, these settings, although not explicitly described or reflected, but the specific embodiment of the invention, are included within its spirit and scope. 此处叙述的所有例子和有条件的语言旨在教导目的,以辅助读者理解发明的原理和发明者对技术进步所贡献的概念,而且这些例子和语言可以解释成对这些所叙述的例子和条件不构成限制。 All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the inventor of the concept and principles of the invention of technological progress contributed, but these examples and language can be interpreted as these examples and conditions as described It does not constitute a limitation.

而且,所有在此叙述发明原理、特征和具体实施例,及其特定实例的陈述, 意在涵括其结构与功能上的等同物。 Furthermore, all the herein reciting principles, aspects, and, according to their specific examples set forth specific embodiments, are intended to encompass its structure and functional equivalents thereof. 此外,其目的还在于这些等同物既包括目前已知的等同物也包括未来开发的等同物,即,被开发的执行相同功能的元件, 而不论其结构如何。 In addition, it is intended that such equivalents include both currently known equivalents but also equivalents developed in the future, i.e., the elements developed that perform the same function, regardless of structure.

因此,举例来说,本领域技术人员能领悟在此展示的框图展现了具体实施本发明原理的示例电路的概念图。 Thus, for example, those skilled in the art can understand the block diagrams presented herein represent conceptual diagram illustrating an example of the specific circuit embodiment of the principles of the present invention. 同样,可以理解的是,任何流程图、流程框图、状态转移图、伪代码等,都表示可在计算机可读介质中充分展现并因此可由计算机或处理器运行的各种程序,而不论该计算机或处理器是否明确显示。 Similarly, it is appreciated that any flow charts, flow diagrams, state transition diagrams, pseudocode, and the like, can be sufficiently expressed, and thus exhibit or by a computer processor to run various programs in a computer-readable medium, regardless of whether the computer whether or processor is explicitly shown.

图中显示的各元件的功能可以通过使用专门的硬件以及能够配合适当软件运行该软件的硬件来提供。 The functions of the various elements of the display may be provided through the use of dedicated hardware as well as hardware with appropriate software capable of running the software. 由处理器提供所述功能时,该功能可由单个专用处理器、单个共享处理器或者由多个单独的处理器(其中一些可是共享的)来提供。 When the function provided by a processor, the functions may be provided by a single dedicated processor, single shared processor, or by a plurality of individual processors (some of which may be shared) is provided. 而且,术语"处理器"或"控制器"的准确的用途,不能解释为仅仅涉及 Further, the term "processor" or "controller" and accurate use and not construed as merely relates to

运行软件的硬件,还可能暗示地,非限定地包括,数字信号处理器(DSP)硬件、 存储软件的只读存储器(R0M)、随机存取存储器(RAM)和非易失性存储器。 Hardware executing software, and may implicitly, including without limitation, digital signal processor, a read only memory (DSP) hardware, stored software (R0M), a random access memory (RAM) and a nonvolatile memory.

还可能包括其它传统硬件。 It may also include other traditional hardware. 类似地,图中显示的任何转换仅为概念上的。 Similarly, any transition diagram shown in conceptual only. 其功能可通过程序逻辑的操作、专用逻辑、程序控制与专用逻辑间的相互作用而实现,甚至手动实现,其特定的技术可以由实施者通过对上下文更特殊明确 Its function may be achieved by the interaction between the operation of program logic, through dedicated logic, program control and dedicated logic, or even manually, the particular technique by which by the implementer as more specifically context

的理解来加以选择。 Understanding to be selected.

在权利要求中,以执行特定功能的装置来表述的任何元件,用来涵括实施该功能的任何方式,包括,例如:a)执行该功能的电路元件的结合或b)任何形式的软件,因而包括与适当的电路结合执行该软件以实现该功能的固件、微码或类似物。 In the claims, means any element to perform a particular function expressed, is intended to encompass any of the embodiments that function including, for example: a) combination of circuit elements perform the function or b) software in any form, thus comprises in combination with appropriate circuitry for executing that software to implement the functionality firmware, microcode or the like. 由权利要求定义的本发明基于这样的事实,即所述各装置所提供的功能以权利要求所主张的方式结合在一起。 Defined by the claims of the present invention is based on the fact, i.e., the combined functions of the respective means provided in the claims of the claimed method. 因此可以认为提供这些功能的任何装置与在此所示的等同。 It is considered that any device that provides equivalent functions and shown herein.

如上文所述,此发明的优点在于,提供了一种能在数字网络(包括但不限 As described above, advantage of this invention is to provide a method capable of digital network (including, without limitation,

于DSL网络)中进行频道改变的方法和设备。 Channel change) in the DSL network method and apparatus. 和现有技术相比,本发明通过使得,例如,DSL网络的本地环路中的带宽占用最小化,提供了对于现有技术系统(如上述的第二种现有技术的系统)的改进。 And compared to the prior art, the present invention makes, for example, DSL local loop bandwidth of the network is minimized, providing improved over the prior art systems (e.g., the above-described second prior art systems).

在现有技术的系统中,如上述第二现有技术的系统,在作出频道改变请求时常规和频道改变流都要经DSL链接(本地回路)发送,这就引起了带宽占用的增加的问题,直至CPE在频道改变流中发出"退出"请求为止。 In the prior art system, as in the second prior art system, when making a channel change request routine and the channel change stream should be transmitted via DSL link (local loop), which raises a problem of an increase in bandwidth until CPE "opt out" in the stream channel change requests so far. 有利的是, 本发明解决了这一问题。 Advantageously, the present invention solves this problem.

如图1所示,可以应用本发明的一个示范的端到端系统架构用附图标记100 来表示。 As shown in FIG. 1, the present invention may be applied to an exemplary system architecture of the end denoted by reference numeral 100. 该系统架构100包括内容供应系统110,区域宽带网络120,数字用户线接入多路复用器(DSLAM) 130,本地回路140,和机顶盒(STB) 150。 The system architecture 100 includes a content supply system 110, a regional broadband network 120, a digital subscriber line access multiplexer (DSLAM) 130, local loop 140, and a set top box (STB) 150. 该内容供应系统110包括视频编码器其包含分别与多路复用器114的第一和第二输入端以信号通信方式相连接的第一和第二输出端。 The content supply system 110 includes a video encoder comprising a first and a second output terminal with the first and second input of the multiplexer 114 is connected in signal communication to. 多路复用器114的输出端提供了内容供应系统110的输出端,其与区域宽带网络120以信号通信方式相连接。 The output of the multiplexer 114 provides the output of the content supply system 110 with the regional broadband network 120 is connected in signal communication. 所述区域宽带网络120还与DSLAM 130的输入端以信号通信方式相连接。 The broadband network region 120 further connected in signal communication with the input of the DSLAM 130.

所述DSLAM 130包括解复用器132,其第一输出端与I帧图像检测器133 的输入端以信号通信方式相连接,其第二输出端与I帧图像捡测器134的输入端以信号通信方式相连接。 The DSLAM 130 includes a demultiplexer 132, a first output terminal and the input I frame image detector 133 is connected in signal communication, a second input terminal of the I frame image output terminal 134 to pick test connected in signal communication. I帧图像检测器133的输出端与频道改变选择逻辑器135的第一输入端以及延迟装置136的第一输入端以信号通信方式相连接。 I frame image detector 133 and the output terminal of the first input channel change selection logic 135 and a first input terminal of delay means 136 is connected in signal communication. I帧图像检测器134的输出端与频道改变选择逻辑器135的第二输入端以及存储装置137的输入端以信号通信方式相连接。 I frame image detector 134 changes the output of the channel select input 137 is connected in signal communication with a second input of the logic 135 and a storage device. 频道改变选择逻辑器135的第一输出端与延迟装置136的第二输入端以信号通信方式相连接。 A first channel change selection logic output terminal and the second input terminal of the delay means 136 to 135 is connected in signal communication. 频道改变选择逻辑器135的第二输出端与选择器138的第一输入端以信号通信方式相连接。 Selecting a first channel change logic input terminal and a second output terminal 135 of the selector 138 is connected in signal communication. 延迟装置136的输出端与选择器138的第二输入端以信号通信方式相连接。 Delay means 136 and the output terminal of the second input terminal of the selector 138 is connected in signal communication. 存储装置137 的输出端与选择器138的第三输入端以信号通信方式相连接。 The third input of the storage means and the output of the selector 137 is in signal communication 138 is connected.

DSLAM 130的第一输入端与解复用器132的输入端以信号通信方式相连接,DSLAM 130的第二输入端与选择逻辑器135的第三输入端以信号通信方式相连接,DSLAM 130的输出端与选择器138的输出端以信号通信方式相连接。 A first input terminal of the DSLAM 130 and the demultiplexer 132 in signal communication with an input terminal connected to a second input terminal and the third input of the selection logic 135 is connected in signal communication with the DSLAM 130, the DSLAM 130 end of the output terminal of the selector 138 is connected in signal communication. DSLAM 130 的第二输入端和输出端与本地回路140以信号通信方式相连接。 DSLAM 130 and a second input terminal and the output terminal of the local loop 140 is connected in signal communication. 应该理解的是, DSLAM 130在此也能称之为"频道改变处理单元"。 It should be understood, DSLAM 130 here also referred to as "channel change processing unit."

机顶盒150包括用户接口152和视频解码器154。 STB 150 includes a user interface 152 and the video decoder 154. 机顶盒150的输出端与本地回路140以及用户接口152以信号通信方式相连接,机顶盒150的输入端与本地回路140以及视频解码器154以信号通信方式相连接。 The output of the set top box 150 and local loop 140 and a user interface 152 is connected in signal communication, and the input terminal 140, and local loop 150 to the video decoder set top box 154 is connected in signal communication.

I帧图像检测器133、 134是用来检测常规流中的I帧图像的。 I frame image detector 133, 134 for detecting I-frame picture of the normal stream. 延迟装置136是用来提供可变延迟的。 Delay means 136 is used to provide a variable delay.

视频编码器112产生编码图像的常规流与频道改变流。 Conventional flow channel and generate an encoded video picture encoder 112 change stream. 常规流与频道改变流一起合并于多路复用器114并通过区域宽带网络120传送至DSLAM 130。 Normal stream and channel change stream combined with the multiplexer 114 and transmitted through a regional broadband network 120 to the DSLAM 130. 为了简化图l,仅显示了单个节目的编码器。 To simplify FIG. L, only a single program encoder. 在实际的系统中,可支持多个节目, 因而,此图中的图框对于每个所支持的节目被复制。 In an actual system, multiple programs can support, thus, this figure is copied frame supported for each program. 用户可通过机顶盒150的用户接口152发出频道改变请求来表示切换到想要观看新的节目。 STB user makes a user interface 152 via a channel 150. The change request a handoff to a new program wants to watch. 该请求将被转发至DSLAM 130。 The request is forwarded to the DSLAM 130.

在本发明的一个较佳实施例中,频道改变流被储存于DSLAM 130的本地存储器(如本地存储装置137)中(或者可由DSLAM 130快速访问的外部存储器)。 Embodiment, a channel change (e.g., local storage 137) is stored in the stream memory 130 in the local DSLAM (DSLAM 130 or may be external fast access memory) in a preferred embodiment of the present invention. 常规状态下,常规流通过本地回路140传送到机顶盒150中的视频解码器154。 A normal state, the normal stream through the local loop 140 to the set top box 150 the video decoder 154. 通过机顶盒150的用户接口152发出频道改变请求时,该请求通过本地回路140 被传送到DSLAM 130中去。 When a channel change request issued by a user interface 152 via a set top box 150, the request is transmitted through local loop 140 to the DSLAM 130 to go. 收到频道改变请求时,DSLAM 130开始将存储的新节目的频道改变流传送至机顶盒150,始于频道改变流中的I帧图像,而不是常规流。 Upon receiving a channel change request, DSLAM 130 will start a new program stored channel change stream to a set top box 150, it begins a channel change stream I picture frame, instead of the normal stream. 然后,在稍后的位置,该DSLAM 130在切换回向STB 150传送常规流。 Then, at a later position in the DSLAM 130 switches back to transmitting the normal stream to the STB 150. 在传送常规流的同时传送频道改变流增加了区域宽带网络120的带宽需求。 While conventional transport stream transport channel change stream increases the bandwidth requirements of the regional broadband network 120. 此带宽的增长将一直持续到机顶盒150在频道改变流中发出"退出"请求。 This bandwidth growth will continue until the set-top box 150 "opt out" request in the channel change stream.

为了本发明的目的,假设DSLAM (或指示频道改变请求的上行处理元件,下文中都称为"DSLAM" 130)能够识别到达其输入端的成对的常规流和频道改变流。 For purposes of this invention, it is assumed (or uplink processing element indicating a channel change request, are hereinafter referred to as "DSLAM" 130) DSLAM reach the normal stream can be identified and its input channel pairs change stream. 更进一步地,还假设该DSLAM 130还能够通过使用如I帧图像检测器133、 134,检测任何输入流中存在的I帧图像。 Still further, it is also assumed that the DSLAM 130 can also be any input stream I frame image present in the frame image by using a detector, such as 133 I, 134, is detected. 当机顶盒150发出频道改变请求时, DSLAM首先在下一到达的I帧图像将频道改变流自动切换到机顶盒150,然后, 该DSLAM设置一标记来检测常规流中下一个I帧图像的到达。 When the set top box 150 issues a channel change request, DSLAM first image of the next I frame arrival channel change stream will automatically switch to the set top box 150, then the DSLAM sets a flag to detect a normal stream reaches the next I frame image. 根据上述第一和 According to the first and

第二种现有技术系统的描述,为了达到节约带宽的目的,频道改变流具有更高频率的I帧图像,而常规流具有较低频率的I帧图像。 A second prior art system described, in order to achieve the purpose of saving bandwidth, the channel change stream I frame image having a higher frequency, the I frame image having a regular stream of lower frequency. 当常规流中下一个I帧 When the normal stream the next I frame

图像到达时,它将被切换至发出原请求的用户所要求的服务。 Image arrives, it is switched to the original request sent by the service user requirements.

应该理解的是,本发明在DSL链路(本地回路140)的带宽效率更高,但要求DSLAM130 (或上行频道改变处理元件)明确频道改变和常规流功能之间的转换。 It should be appreciated that the present invention is more efficient bandwidth DSL link (local loop 140), but requires DSLAM130 (or uplink channel change process element) to convert between the normal stream and the channel change clear function.

如图2显示,在DSL系统的数字用户线接入多路复用器(DSLAM)中,一种用于进行频道改变的方法用附图标记200来表示。 2 shows Access Multiplexer (DSLAM) in a digital subscriber line DSL system, a method for performing a channel change denoted by reference numeral 200. 开始模块210传递控制给判断模块220。 Transmission start control module 210 to the determining module 220. 该判断模块220确定是否收到播放当前节目的频道改变请求。 The determining module 220 determines whether a channel change request is received to play a current program. 如果未收到频道改变请求,则控制将被回传给判断模块220。 If the channel change request is not received, then control is passed back to the determination module 220. 否则,若收到频道改变请求,控制将被传送给功能模块222。 Otherwise, if the channel change request is received, control is transferred to the function module 222. 该功能模块222送出频道改变流编码的I帧图像,并传递控制至下一功能模块224。 The function block 222 sends a channel change stream coded I-frame picture, and passes control to the next function module 224. 该功能模块224设置一标记用以检测常规流中下一个I帧图像的到达,并传递控制至判断模块226。 The function module 224 sets a flag for detecting the normal stream reaches the next I-frame picture, and passes control to the judging module 226. 该判断模块226判断常规流中下一I帧图像是否到达。 The determination module 226 determines the normal stream reaches the next I-frame image. 如果常规流中下一I帧图像还未到达,则将控制传回到判断模块226。 If the next I frame in the normal stream picture has not reached, then control is passed back to decision block 226. 反之,若常规流中下一I帧图像已到达,则将控制传至功能模块240。 Conversely, if the next I frame image has reached the normal stream, then control is passed to function block 240.

该功能模块240将常规流(包括下一个I帧图像)发送至请求频道改变的个人/装置,并传送控制至功能模块245。 The normal stream function module 240 (including the next I-frame image) is transmitted to the personal / channel change request means, and transfer control to the function block 245. 该功能模块245重新设置标记,并把控制传送至判断模块250。 The function module 245 to reset the flag, and transfers control to the judging module 250. 判断模块250判断是否收到退出当前节目的频道改变请求。 Determining module 250 determines whether or not to exit the current program channel change request. 如果未收到频道改变请求,则将控制传送回功能模块240。 If the channel change request is not received, block 240 will transfer control back to the function. 相反,若收到该频道改变请求,则将控制传送至结束模块260。 Conversely, if the channel change request is received, then control module 260 is transmitted to the end.

基于此处的教导,本发明上述及其它特征与优点,可以为本领域一般技术人员很容易地理知。 Based on the teachings herein, the present invention is the above-mentioned and other features and advantages, may be known to those of ordinary skill in the art will readily geographic art. 可以理解,本发明的教导可以用硬件、软件、固件、专用处理器或者其结合的不同形式来实施。 It will be appreciated, the teachings of the present invention may be implemented in hardware, software, firmware, special purpose processors, or a combination of different forms thereof implemented.

最优选的是,结合软件与硬件来实施本发明的教导。 Most preferably, the combination of software and hardware used to implement the teachings of the present invention. 而且,软件更适合以明理嵌在程序储存单元的应用程序来实施。 Moreover, the software is preferably embedded in the sensible application program storage unit is implemented. 该应用程序可以由具有任何适当结构的机器上载及执行。 The application program may be executed by, a machine comprising any suitable architecture and carrier. 更优选地是,该机器是在具有硬件的计算机平台上实施的,如一个或者多个中央处理器(CPU),随机存取存储器(RAM)和输入/输出(I/O)接口。 More preferably, the machine is implemented on a computer platform having hardware such as one or more central processing units (CPU), a random access memory (RAM) and input / output (I / O) interfaces. 该计算机平台还可能包括操作系统和微指令代码。 The computer platform may also include an operating system and microinstruction code. 此处描述的各式程序和功能可以是由CPU执行的部分微指令代码或部分应用程序,或者其组 Variety of procedures and functions described herein may be executed by the CPU part of the microinstruction code or part of the application, or a group

合。 Co. 此外,各种其它外围单元可以与该计算机平台相连接,例如另外的数据存储单元和打印单元。 In addition, various other peripheral units may be connected to the computer platform such as an additional data storage unit and a printing unit.

需要进一步了解的是,由于附图中描述的一些组成的系统元件与方法更适合以软件来实施,因此,系统元件之间或程序功能框之间的实际联系可能根据本发明编程方式不同而存在差异。 To be further understood that, because some of the drawings system components and methods described in more suitable embodiment in software, therefore, the actual connections between the system components or between the process function blocks may differ depending upon the programming of the present invention . 根据此处的教导,相关技术领域的普通技术人员能够联想到本发明的这些以及相近的实施或配置。 According to the teachings herein, one of ordinary skill in the relevant art will be able to contemplate these and similar implementations or configurations of the present invention.

虽然,在此参考附图描述了示例性的具体实施例,需要理解的是,本发明并不仅限于这些具体实施例,相关技术领域中的普通技术人员能够于此基础上实现各种变化和修改,而不超出本发明的实质精神或范围。 Although, in this figure depicts an exemplary embodiment with reference to specific embodiments, it is understood that the present invention is not limited to these specific embodiments, in the related art enables one of ordinary skill that various changes and modifications thereto on the basis of , without departing from the true spirit or scope of the present invention. 所有这些变化和修改都包含在所附的权利要求阐述的本发明的范围内。 All such variations and modifications are included within the scope of the invention set forth in the appended claims.

Claims (16)

  1. 1. 一种用于在数字网络中进行频道改变的电路,该电路具有用于接收频道改变流与常规流的输入端,该电路还包括:多路复用器,用于响应于来自用户端设备CPE装置的频道改变请求,将频道改变流发送至CPE装置;存储装置,用于存储响应于来自CPE装置的频道改变请求而设置的标记,该标记被设置用于请求检测常规流中的图像元素;以及图像元素检测器,用于在传送频道改变流之后,检测常规流中的图像元素;其中一旦在常规流中检测到图像元素,所述多路复用器就向CPE装置传送常规流以替代频道改变流。 A circuit for a channel change in a digital network for the circuit having means for receiving a channel change stream and a normal stream input, the circuit further comprises: a multiplexer for the UE in response to a equipment CPE device channel change request, transmitting the channel change stream to the CPE device; storage means for storing in response to a channel change request from the CPE device being provided flag, the flag is detected image request provided for in the normal stream element; and an image element detector for the channel change stream after transmitting, detecting the picture element in the normal stream; wherein upon detecting the picture element in the normal stream, the multiplexer transmits the normal stream to the CPE device in alternate channel change stream.
  2. 2. 根据权利要求1所述的电路,其中所述图像元素是无记忆图像元素。 The circuit according to claim 1, wherein said image element is a memoryless picture element.
  3. 3. 根据权利要求1所述的电路,其中所述频道改变流比常规流包含更多的图像元素。 The circuit according to claim 1, wherein the channel change stream contains more than the normal stream picture element.
  4. 4. 根据权利要求1所述的电路,其中当在常规流中检测到图像元素时,储存在存储装置中的标记被重新设置。 4. The circuit according to claim 1, wherein when detecting the picture element in the normal stream, flag stored in the storage means is reset.
  5. 5. 根据权利要求1所述的电路,还包括可变延迟装置,用于在从多路复用器向CPE装置传送常规流之前,延迟常规流。 The circuit according to claim 1, further including variable delay means for prior to transmitting the normal stream to the CPE from the multiplexer means, delay the normal stream.
  6. 6. 根据权利要求1所述的电路,其中所述电路被实施于数字用户线接入多路复用器DLSAM中。 The circuit according to claim 1, wherein the circuit is implemented in a digital subscriber line access multiplexer in DLSAM.
  7. 7. 根据权利要求1所述的电路,其中所述数字网络为数字用户线DSL网络。 The circuit according to claim 1, wherein the digital network is a digital subscriber line DSL network.
  8. 8. 根据权利要求l所述的电路,其中所述图像元素包括I帧片段,I帧图像,和即时编码刷新IDR图像中的任一种。 8. The circuit according to claim l, wherein said element comprises an I-frame image segments, an I-frame picture, and instant refresh encoding any one of IDR pictures.
  9. 9. 一种用于在连接数字网络中进行频道改变的方法,该方法用于与数字网络相连接并具有用于接收频道改变流和常规流的输入端的电路,该方法包括以下步骤:响应于来自用户端设备CPE装置的频道改变请求,发送频道改变流至CPE装置;响应于来自CPE装置的频道改变请求来设置标记,以请求检测常规流中的图像元素;在传送频道改变流之后,检测常规流中的图像元素;以及一旦在常规流中检测到图像元素,就向CPE装置传送常规流以取代频道改变流。 9. A method for connecting a digital network channel change, the method for connection to a network and having a digital stream and a channel change circuit for receiving the input of the normal stream, the method comprising the steps of: in response to channel from the customer premises equipment CPE device change request, transmitting the channel change stream to the CPE device; response to a channel from the CPE device change request flag is set to request the image elements detected in the normal stream; after transmitting the channel change stream, detecting picture element in the normal stream; and upon detecting the picture element in the normal stream, it transmits the normal stream to the CPE device in place of the channel change stream.
  10. 10. 根据权利要求9所述的方法,其中所述图像元素为无记忆图像元素。 10. The method according to claim 9, wherein said image element is a memoryless picture element.
  11. 11. 根据权利要求9所述的方法,其中所述频道改变流比常规流包含更多的图像元素。 11. The method according to claim 9, wherein the channel change stream contains more than the normal stream picture element.
  12. 12. 根据权利要求9所述的方法,还包括当在常规流中检测到图像元素时, 重新设置所述标记的步骤。 12. The method of claim 9, further comprising when detecting the picture element in the normal stream, the step of resetting said mark.
  13. 13. 根据权利要求9所述的方法,还包括在从所述电路向CPE装置传送常规流之前,延迟常规流的步骤。 13. The method of claim 9, further comprising prior to transmitting the normal stream to the CPE from said circuit means, a delay step of the normal stream.
  14. 14. 根据权利要求9所述的方法,其中所述电路被实施于数字用户线接入多路复用器DLSAM中。 14. The method according to claim 9, wherein the circuit is implemented in a digital subscriber line access multiplexer in DLSAM.
  15. 15. 根据权利要求9所述的方法,其中所述数字网络为数字用户线DSL网络。 15. The method according to claim 9, wherein the digital network is a digital subscriber line DSL network.
  16. 16.根据权利要求9所述的方法,其中所述图像元素包括I帧片段,I帧图像,和即时编码刷新IDR图像中的任一种。 16. The method of claim 9, wherein said element comprises an I-frame image segments, an I-frame picture, and instant refresh encoding any one of IDR pictures.
CN 200580041922 2004-12-06 2005-07-15 Network managed channel change in digital networks CN100539506C (en)

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