CN100539506C - The channel of the network control in the digital network changes - Google Patents

The channel of the network control in the digital network changes Download PDF

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Publication number
CN100539506C
CN100539506C CNB2005800419226A CN200580041922A CN100539506C CN 100539506 C CN100539506 C CN 100539506C CN B2005800419226 A CNB2005800419226 A CN B2005800419226A CN 200580041922 A CN200580041922 A CN 200580041922A CN 100539506 C CN100539506 C CN 100539506C
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China
Prior art keywords
channel
normal flow
pictorial element
circuit
changes
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Expired - Fee Related
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CNB2005800419226A
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Chinese (zh)
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CN101073223A (en
Inventor
库马尔·拉马斯瓦米
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Thomson Licensing SAS
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Thomson Licensing SAS
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2801—Broadband local area networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/12—Arrangements for remote connection or disconnection of substations or of equipment thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
    • H04N21/23106—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion involving caching operations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
    • H04N21/234345—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] 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
    • H04N21/2365—Multiplexing of several video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling 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
    • H04N21/4347—Demultiplexing of several video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4383—Accessing a communication channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4383—Accessing a communication channel
    • H04N21/4384—Accessing a communication channel involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; 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 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; 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 
    • H04N21/65—Transmission of management data between client and server
    • H04N21/658—Transmission by the client directed to the server
    • H04N21/6581—Reference data, e.g. a movie identifier for ordering a movie or a product identifier in a home shopping application

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

The invention provides a kind of circuit and corresponding method that is used for carrying out the channel change at digital network.This circuit comprises that being used for receiving channels changes the input that flows with normal flow.This circuit also comprises multiplexer, storage device, and picture element detector.This multiplexer is used for the channel change request of response from ustomer premises access equipment (CPE) device, sends channel to the CPE device and changes stream.This storage device is used to store the mark that is provided with in response to the channel from the CPE device changes request.This mark is set for the pictorial element in the request detection normal flow.This picture element detector is used for detecting the pictorial element of normal flow after transmitting channel change stream.In case detect pictorial element in normal flow, multiplexer just transmits normal flow to the CPE device and changes stream to replace channel.

Description

The channel of the network control in the digital network changes
The cross reference of related application
The application advocates that the application number of submitting on December 6th, 2004 is 60/633,475 U.S. Provisional Application No., and its content is all quoted at this.
Technical field
The present invention relates generally to digital network, relate in particular to a kind of method and apparatus that can in digital network, carry out the channel change.
Background technology
In Digital Subscriber Line (DSL) multicast/broadcast video system, can compressed video be sent to a set-top box (STB) with procotol (IP) multicast.Group of networks management agreement (IGMP) is the mechanism that is used to select to watch which channel, and it is realized by joining request of required channel being sent to multiplexer in digital user line access (DSLAM).When not rethinking when watching this channel, can send one and withdraw from and ask to DSLAM.
In the commercial video that relies on the DSL broadcast system, hope can allow the terminal use to change channel apace.General Standard of image compression such as MPEG-2 and JVT/H.264/MPEG AVC etc., is used in the frame and interframe encode.In order to be correctly decoded, decoder must continue follow-up interframe encode (P and B) image is decoded then to decoding with intraframe coding (I) image or instantaneous decoding refresh (IDR) image or the compression of video sequence of one section I frame fragment beginning.An image sets (GOP) can comprise at least one I two field picture and at least one P and/or B two field picture.With regard to identical picture quality, intraframe coding (I) image needs more numerical digit to encode than interframe encode (P and B) image, usually in 3 ~ 10 times numerical digit scope.
When receiver began to receive the program of a specific channel, after changing channel or when receiver starts at first, receiver could begin to be correctly decoded after must waiting and receiving an I two field picture, and this has just caused delay.
In order to make the channel in the digital video broadcast system change delay minimization, transmit the I two field picture usually continually, for example every N image is once.For instance, video compression partly has 1/2 second delay in the system in order to make, and generally needs N=15 concerning the content of 30 frame/seconds.Because the I two field picture of compression is than the P and big many of B two field picture of compression, if the I two field picture is not inserted so continually, bit rate will significantly increase and above desired.
In first kind of prior art system, channel changes that stream is encoded and transmits with the video bit stream of routine.Comprise low-quality I two field picture in the channel change stream, transmit with the frequency that is higher than the I two field picture in the normal flow.When the user is transformed into new channel, can receive that routine or channel begin when changing the first group of I two field picture that flows to play.
In second kind of prior art system,, outside conventional encoding stream, also the channel change stream of relatively low bit rate, low resolution is encoded for every kind of program.When ustomer premises access equipment (CPE) receives channel when changing request, in the channel of the program of new choosing changes stream and normal flow, all make and joining request, and flow down row with these two kinds and send to the DSL link.CPE suitably is transformed into normal flow from channel change stream then.
Because in above-mentioned second kind of prior art scheme, when channel changes the request proposition, simultaneously conventional and channel are changed to spread and deliver to the DSL link, this just will cause bandwidth to increase, and send " withdrawing from " until CPE on channel change stream and ask.For example, the user who forwards the high definition channel to can cause the increase of the utilized bandwidth of low resolution (may be single-definition) channel.
Therefore, overcoming the problems referred to above of the prior art, obtain a kind of new technology and equipment and change with the channel that reaches in the digital network, is very necessary and valuable.
Summary of the invention
The present invention has overcome shortcomings and deficiencies of the prior art, provides a kind of being used for to carry out the method and apparatus that channel changes at digital network.
According to an aspect of the present invention, provide a kind of being used for to carry out the circuit that channel changes at digital network.This circuit has the input that is used for receiving channels change stream and normal flow.This circuit also comprises multiplexer, storage device and picture element detector.This multiplexer is used for changing request in response to the channel from the CPE device, channel is changed to spread deliver to the CPE device.This storage device is used to store the mark that is provided with in response to the channel from the CPE device changes request.This mark is set for the pictorial element in the request detection normal flow.This picture element detector is used for detecting the pictorial element in the normal flow after transmitting channel change stream.In case detect pictorial element in normal flow, multiplexer will send normal flow to CPE device and change stream to substitute channel.
According to another aspect of the present invention, provide a kind of at the linking number word network and have and be used for the circuit that receiving channels changes stream and the input of normal flow, be used for carrying out the method that channel changes at digital network.This method comprises in response to the channel from ustomer premises access equipment (CPE) device and changes request, channel changed spread the step of delivering to the CPE device.This method comprises that also changing request in response to the channel from the CPE device is provided with mark, with the step of request detected image element in normal flow.This method also is included in and transmits after the channel change stream, detects the step of the pictorial element in the normal flow.In addition, this method also comprises in case detect pictorial element in normal flow, just normal flow is sent to the CPE device and changes the step that flows to replace channel.
According to the specific descriptions of the exemplary embodiment that can read below in conjunction with accompanying drawing, above-mentioned and other aspects, feature and advantage of the present invention will be more obvious.
Description of drawings
The present invention may be better understood in conjunction with the following drawings, wherein:
Figure 1 shows that the schematic block diagram of end-to-end topology in accordance with the principles of the present invention; And
Figure 2 shows that the flow chart that carries out the method that channel changes in Digital Subscriber Line (DSL) system in accordance with the principles of the present invention.
Embodiment
The present invention relates in digital network, carry out the method and apparatus that channel changes.
Advantageously, the present invention improves on the basis of above-mentioned first and second kinds of prior art systems, has overcome related defects described above.For example, the present invention has reduced bandwidth consumption that initiated by ustomer premises access equipment (CPE) in Digital Subscriber Line (DSL) system, that the low channel that postpones changes mechanism.According to principle of the present invention, send channel by CPE and change request.Digital subscriber line access multiplexer device (DSLAM) (or other upstream plants) in response to this request, is converted to low resolution channel and changes stream, and be in due course, and is converted to full resolution stream.
Being understandable that, is interchangeable at this used " ustomer premises access equipment (CPE) " with terms such as " set-top box (STB) ".Term " memoryless pictorial element " refers to the present image element that relies on a previous or back pictorial element.In addition, will be further appreciated that term " I two field picture " and " memoryless pictorial element " are used interchangeably to refer to any I frame fragment, instantaneous decoding refresh (IDR) image, perhaps I two field picture at this.
In addition, be understandable that, though the present invention has mainly described a specific examples about digital network, it is user data line (DSL) network, but according to inventing in this instruction that provides, those of ordinary skill in the art can easily be applied to the present invention in any convertible digital network and go, and still keeps within the scope of the invention.
This specification has been set forth principle of the present invention.Thereby, can think that those skilled in the art can make various settings in view of the above, though clearly description or embodiment of these settings, but specifically implemented invention, and be contained in its spirit and scope.
Xu Shu all examples and language with good conditionsi are intended to instruct purpose herein, the notion of technological progress being contributed with the principle and the inventor of auxiliary reader understanding's invention, and these examples and language can be construed to these examples of narrating and condition are not construed as limiting.
And all narrate inventive principle, feature and specific embodiment at this, and the statement of particular instance, are intended to include the equivalent on its structure and the function.In addition, its purpose is that also these equivalents had both comprised that present known equivalent also comprised the equivalent of following exploitation, that is, the element of the execution identical function that is developed, no matter and its structure how.
Therefore, for instance, those skilled in the art can comprehend the concept map that block diagram has shown herein represented the exemplary circuit of the concrete enforcement principle of the invention.Equally, be understandable that, any flow chart, FB(flow block), state transition diagram, false code etc. are all represented fully to represent in computer-readable medium and therefore can be by the various programs of computer or processor operation, no matter and whether this computer or processor clearly show.
The function of each element that shows among the figure can be by using special hardware and can cooperating the hardware of suitable this software of running software to provide.When providing described function by processor, this function can provide by single application specific processor, single shared processing device or by a plurality of independent processors (some of them are shared).And, the purposes accurately of term " processor " or " controller ", can not be interpreted as only relating to the hardware of operating software, also may be impliedly, non-exclusively comprise read-only memory (ROM), random-access memory (ram) and the nonvolatile memory of digital signal processor (DSP) hardware, storing software.
Also may comprise other conventional hardware.Similarly, any conversion that shows among the figure is only for notional.Its function can realize by the interaction between operation, special logic, program control and the special logic of programmed logic, even manually realizes, its specific technology can by the implementer by to context more special clear and definite understanding selected.
In the claims, any element of explaining with the device of carrying out specific function, be used for including any way of implementing this function, comprise, for example: a) carry out the combination or the b of the circuit element of this function) any type of software, thereby comprise combining with suitable circuit and carry out firmware, microcode or the analog of this software to realize this function.By such fact that the present invention is based on of claim definition, the mode that the function that promptly described each device is provided is advocated with claim combines.Therefore can think any device of these functions and shown here being equal to are provided.
As indicated above, the advantage of this invention is, provides a kind of and can carry out the method and apparatus that channel changes in digital network (including but not limited to the DSL network).Compare with prior art, the present invention is by making that for example, the bandwidth occupancy in the local loop of DSL network minimizes, and the improvement for prior art systems (as second kind of above-mentioned prior art system) is provided.
In prior art system, as above-mentioned second prior art system, routine and channel change stream all will link (home loop) transmission through DSL when making channel change request, this is with regard to the problem of the increase that caused bandwidth occupancy, until CPE channel change send " withdrawing from " request in the stream till.Advantageously, the invention solves this problem.
As shown in Figure 1, the end-to-end system framework that can use a demonstration of the present invention is represented with Reference numeral 100.This system architecture 100 comprises contents providing system 110, regional broadband network 120, digital subscriber line access multiplexer device (DSLAM) 130, home loop 140, and set-top box (STB) 150.This contents providing system 110 comprises video encoder 112, and it comprises respectively first and second outputs that are connected in the signal communication mode with first and second inputs of multiplexer 114.The output of multiplexer 114 provides the output of contents providing system 110, and it is connected in the signal communication mode with regional broadband network 120.Described regional broadband network 120 also is connected in the signal communication mode with the input of DSLAM 130.
Described DSLAM 130 comprises demodulation multiplexer 132, and its first output is connected in the signal communication mode with the input of I two field picture detector 133, and its second output is connected in the signal communication mode with the input of I two field picture detector 134.The output of I two field picture detector 133 changes the first input end of selection logic device 135 with channel and the first input end of deferred mount 136 is connected in the signal communication mode.The output of I two field picture detector 134 changes second input of selection logic device 135 with channel and the input of storage device 137 is connected in the signal communication mode.Channel changes selects first output of logic device 135 to be connected in the signal communication mode with second input of deferred mount 136.Channel changes selects second output of logic device 135 to be connected in the signal communication mode with the first input end of selector 138.The output of deferred mount 136 is connected in the signal communication mode with second input of selector 138.The output of storage device 137 is connected in the signal communication mode with the 3rd input of selector 138.
The first input end of DSLAM 130 is connected in the signal communication mode with the input of demodulation multiplexer 132, second input of DSLAM 130 is connected in the signal communication mode with the 3rd input of selecting logic device 135, and the output of DSLAM 130 is connected in the signal communication mode with the output of selector 138.Second input of DSLAM 130 is connected in the signal communication mode with home loop 140 with output.It should be understood that DSLAM 130 also can be referred to as " channel change processing unit " at this.
Set-top box 150 comprises user interface 152 and Video Decoder 154.The output of set-top box 150 is connected in the signal communication mode with home loop 140 and user interface 152, and the input of set-top box 150 is connected in the signal communication mode with home loop 140 and Video Decoder 154.
I two field picture detector the 133, the 134th is used for detecting I two field picture in the normal flow.Deferred mount 136 is used to provide variable delay.
Normal flow and channel that video encoder 112 produces coded image change stream.Normal flow changes stream with channel and is incorporated in multiplexer 114 and is sent to DSLAM 130 by regional broadband network 120.For reduced graph 1, only shown the encoder of single program.In the system of reality, can support a plurality of programs, thereby the picture frame among this figure is replicated for each program of supporting.The user can send the channel change by the user interface 152 of set-top box 150 and ask to represent to switch to want to watch new program.This request will be forwarded to DSLAM 130.
In a preferred embodiment of the present invention, channel changes in the local storage (as local storage device 137) that stream is stored in DSLAM 130 (perhaps can by the external memory storage of DSLAM 130 fast accesses).Under the conventional state, normal flow is sent to Video Decoder 154 in the set-top box 150 by home loop 140.When the user interface 152 by set-top box 150 sent channel and changes request, this request was sent among the DSLAM 130 by home loop 140 and goes.Receive when channel changes request that the channel that DSLAM 130 begins new program that will storage changes to spread delivers to set-top box 150, start from channel and change I two field picture in the stream rather than normal flow.Then, in position after a while, this DSLAM 130 is switching back to STB150 transmission normal flow.
When transmitting normal flow, transmit channel and change the bandwidth demand that stream has increased regional broadband network 120.The growth of this bandwidth will last till always that set-top box 150 changes at channel and send " withdrawing from " request in the stream.
For the purposes of the present invention, suppose that DSLAM (or indication channel change the up treatment element of request, hereinafter be called " DSLAM " 130) can discern the paired normal flow and the channel that arrive its input and change stream.Further, suppose that also this DSLAM 130 can also detect the I two field picture that exists in any inlet flow by using as I two field picture detector 133,134.When set-top box 150 was sent channel change request, DSLAM at first changed stream at the I of next arrival two field picture with channel and automatically switches to set-top box 150, and then, this DSLAM is provided with the arrival that a mark detects next I two field picture in the normal flow.According to the description of above-mentioned first and second kinds of prior art systems, in order to reach the purpose of conserve bandwidth, channel changes the I two field picture that stream has higher frequency, and normal flow has the I two field picture of lower frequency.When next I two field picture arrives in the normal flow, it will be switched to sending the desired service of former requesting users.
It should be understood that the present invention is higher at the bandwidth efficiency of DSL link (home loop 140), but require the conversion between clear and definite channel change of DSLAM 130 (or upstream channel change treatment element) and the normal flow function.
Show as Fig. 2, in the digital subscriber line access multiplexer device (DSLAM) of DSL system, a kind ofly be used to carry out the method that channel changes and represent with Reference numeral 200.Beginning module 210 transmitting control are given judge module 220.This judge module 220 determines whether to receive that the channel of playing current program changes request.Do not change request if receive channel, then control will be given judge module 220 by passback.Otherwise, changing request if receive channel, control will be transmitted to functional module 222.This functional module 222 is sent the I two field picture that channel changes stream encryption, and passes control to next functional module 224.This functional module 224 is provided with the arrival of a mark in order to next I two field picture in the detection normal flow, and passes control to judge module 226.This judge module 226 judges whether next I two field picture arrives in the normal flow.If next also no show of I two field picture in the normal flow then transfers back to control judge module 226.Otherwise,, then control is reached functional module 240 if next I two field picture arrives in the normal flow.
This functional module 240 is sent to individual/device that the request channel changes with normal flow (comprising next I two field picture), and transmission is controlled to functional module 245.This functional module 245 is reset mark, and passes control to judge module 250.Judge module 250 judges whether to receive that the channel that withdraws from current program changes request.Do not change request if receive channel, then control is sent back functional module 240.On the contrary, change request, then control is sent to and finishes module 260 if receive this channel.
Based on instruction herein, the present invention above-mentioned and other feature and advantage can be known for persons skilled in the art are easy to geography.Be appreciated that instruction of the present invention can implement with the multi-form of hardware, software, firmware, application specific processor or its combination.
Most preferably, implement instruction of the present invention in conjunction with software and hardware.And software is more suitable for implementing with the sensible application program that is embedded in the program storage element.This application program can be uploaded and be carried out by the machine with any appropriate configuration.More preferably be, this machine is to implement having on the computer platform of hardware, as one or more central processing unit (CPU), and random-access memory (ram) and I/O (I/O) interface.This computer platform also may comprise operating system and micro-instruction code.Various program described herein and function can be part micro-instruction code or the certain applications programs of being carried out by CPU, perhaps its combination.In addition, various other peripheral cells can be connected with this computer platform, for example other data storage cell and print unit.
Need further be appreciated that because system element and the method for some compositions of describing are more suitable for implementing with software in the accompanying drawing, therefore, between the system element or the actual contact between the program function frame may be according to the present invention programming mode difference and there are differences.According to instruction herein, the those of ordinary skill of correlative technology field can be associated these and close enforcement or configuration of the present invention.
Though, at this exemplary specific embodiment has been described with reference to the drawings, has it will be appreciated that, the present invention is not limited in these specific embodiments, those of ordinary skill in the correlative technology field can be gone up in this basis and realize variations and modifications, and does not exceed connotation of the present invention or scope.All such changes and modifications are included in the scope of the present invention of appended claim elaboration.

Claims (16)

1. one kind is used for carrying out the circuit that channel changes at digital network, and this circuit has the input that is used for receiving channels change stream and normal flow, and this circuit also comprises:
Multiplexer is used for changing request in response to the channel from ustomer premises access equipment CPE device, channel is changed stream be sent to the CPE device;
Storage device is used for memory response and changes request and the mark of setting in the channel from the CPE device, and this mark is set for the pictorial element in the request detection normal flow; And
Picture element detector is used for detecting the pictorial element in the normal flow after transmitting channel change stream;
In a single day wherein detect pictorial element in normal flow, described multiplexer just transmits normal flow to the CPE device and changes stream to substitute channel.
2. circuit according to claim 1, wherein said pictorial element are memoryless pictorial elements.
3. circuit according to claim 1, wherein said channel change the current transformation ratio normal flow and comprise the more images element.
4. circuit according to claim 1, wherein when detecting pictorial element in normal flow, the mark that is stored in the storage device is reset.
5. circuit according to claim 1 also comprises variable delay device, be used for from multiplexer before the CPE device transmits normal flow, postpone normal flow.
6. circuit according to claim 1, wherein said circuit are implemented among the digital subscriber line access multiplexer device DLSAM.
7. circuit according to claim 1, wherein said digital network are the digital user wire DSL network.
8. circuit according to claim 1, wherein said pictorial element comprises the I frame fragment, I two field picture and instant coding refresh any in the IDR image.
9. one kind is used for carrying out the method that channel changes at the linking number word network, and this method is used for being connected and having with digital network being used for the circuit that receiving channels changes the input of stream and normal flow, and this method may further comprise the steps:
Change request in response to channel, send the channel change and flow to the CPE device from ustomer premises access equipment CPE device;
Change request in response to channel mark is set, with the pictorial element in the request detection normal flow from the CPE device;
After transmitting channel change stream, detect the pictorial element in the normal flow; And
In case in normal flow, detect pictorial element, just transmit normal flow and change stream to replace channel to the CPE device.
10. method according to claim 9, wherein said pictorial element are memoryless pictorial element.
11. method according to claim 9, wherein said channel change the current transformation ratio normal flow and comprise the more images element.
12. method according to claim 9 also comprises when detecting pictorial element in normal flow, resets the step of described mark.
13. method according to claim 9 also was included in from described circuit before the CPE device transmits normal flow, postponed the step of normal flow.
14. method according to claim 9, wherein said circuit are implemented among the digital subscriber line access multiplexer device DLSAM.
15. method according to claim 9, wherein said digital network are the digital user wire DSL network.
16. method according to claim 9, wherein said pictorial element comprises the I frame fragment, and I two field picture and instant coding refresh any in the IDR image.
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US6889385B1 (en) * 2000-01-14 2005-05-03 Terayon Communication Systems, Inc Home network for receiving video-on-demand and other requested programs and services
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US7523482B2 (en) * 2002-08-13 2009-04-21 Microsoft Corporation Seamless digital channel changing
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