EP1836800A1 - Network managed channel change in digital networks - Google Patents
Network managed channel change in digital networksInfo
- Publication number
- EP1836800A1 EP1836800A1 EP05771079A EP05771079A EP1836800A1 EP 1836800 A1 EP1836800 A1 EP 1836800A1 EP 05771079 A EP05771079 A EP 05771079A EP 05771079 A EP05771079 A EP 05771079A EP 1836800 A1 EP1836800 A1 EP 1836800A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channel change
- stream
- picture element
- normal stream
- picture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- 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
- H04L12/02—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, manipulating MPEG-4 scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video 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
- H04N21/234345—Processing of video elementary streams, e.g. splicing of video 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
-
- 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 MPEG 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 MPEG 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
Definitions
- the present invention relates generally to digital networks and, more particularly, to a method and apparatus for enabling a channel change in a digital network.
- IP multicast In a Digital Subscriber Line (DSL) multicast/broadcast video system, Internet Protocol (IP) multicast can be used to transmit compressed video to a set-top box (STB).
- IP Internet Protocol
- the Internet Group Management Protocol (IGMP) is a mechanism to select which channel to watch, by sending a join request for the desired channel to a Digital Subscriber Line Access Multiplexer (DSLAM). When that channel is no longer desired, a leave request can be sent to the DSLAM.
- DSLAM Digital Subscriber Line Access Multiplexer
- a decoder In a commercial video over DSL broadcast system, it is desirable to allow end users to be able to change channels rapidly.
- Popular video compression standards such as MPEG-2 and JVT/H.264/MPEG AVC use intra and inter coding.
- a decoder For proper decoding, a decoder must decode a compressed video sequence beginning with an intra-coded (I) picture or instantaneous decoder refresh (IDR) picture or an l-slice, and then continuing to decode the subsequent inter-coded (P and B) pictures.
- a Group of Pictures may include at least one l-picture and at least one P and/or B picture.
- I- pictures typically require many more bits to code than a P or B picture of equivalent video quality, often in the range of 3-10 times as many bits.
- a receiver When a receiver initially begins receiving a program on a particular channel, following a channel change or upon the initial turning on of the receiver, the receiver must wait until an l-picture is received to begin decoding properly, which causes a delay.
- a channel change stream was encoded and transmitted along with the normal video bitstream.
- the channel change stream included lower quality l-pictures that were sent at a higher frequency than l-pictures in the normal bitstream.
- playback could begin upon receipt of the first l-pictures, in either the normal or channel change stream.
- a relatively low bitrate, low resolution channel change stream is encoded, in addition to the normal coded stream.
- CPE Customer Premises Equipment
- a circuit for enabling a channel change in a digital network has inputs for receiving a channel change stream and a normal stream.
- the circuit further includes a multiplexer, a memory device, and a picture element detector.
- the multiplexer is for transmitting the channel change stream to a customer premises equipment (CPE) device in response to a channel change request from the CPE device.
- the memory device is for storing a flag that is set in response to the channel change request from the CPE device.
- the flag is set to request detection of a picture element in the normal stream.
- the picture element detector is for detecting the picture element in the normal stream subsequent to transmitting the channel change stream.
- the multiplexer transmits the normal stream to the CPE device in place of the channel change stream once the picture element is detected in the normal stream.
- a method for enabling a channel change in the digital network includes the step of transmitting the channel change stream to a customer premises equipment (CPE) device in response to a channel change request from the CPE device.
- the method also includes the step of setting a flag, in response to the channel change request from the CPE device, to request detection of a picture element in the normal stream.
- The also further includes the step of detecting the picture element in the normal stream subsequent to transmitting the channel change stream.
- the method includes the step of transmitting the normal stream to the CPE device in place of the channel change stream, once the picture element is detected in the normal stream.
- FIG. 1 shows a block diagram for an end-to-end architecture in accordance with the principles of the present invention
- FIG. 2 shows a flow diagram for a method for enabling a channel change in a
- DSL Digital Subscriber Line
- the present invention is directed to a method and apparatus for enabling a channel change in a digital network.
- the present invention improves upon the first and second prior art systems described herein above, overcoming the above-described deficiencies associated therewith.
- the present invention reduces bandwidth consumption for a Customer Premises Equipment (CPE) initiated, low-delay channel- change mechanism over a Digital Subscriber Loop (DSL) system.
- CPE Customer Premises Equipment
- DSL Digital Subscriber Loop
- the request for channel change is made by the CPE.
- the digital subscriber line access multiplexer (DSLAM) (or some other equipment upstream), in response to this request, switches in a lower-resolution channel-change stream and at an appropriate time later, switches in the full-resolution stream.
- DSL Digital Subscriber Loop
- CPE customer service equipment
- STB set top box
- memoryless picture element refers to a current picture element that does depend on a preceding picture element or a succeeding picture element.
- l-picture and “memoryless picture element” are used interchangeably herein to refer to any of l-slices, instantaneous decoder refresh (IDR) pictures, or l-pictures.
- processor or “controller” should not be construed to refer exclusively to hardware capable of executing software, and may implicitly include, without limitation, digital signal processor (“DSP”) hardware, read-only memory (“ROM”) for storing software, random access memory (“RAM”), and non-volatile storage. Other hardware, conventional andyor custom, may also be included.
- DSP digital signal processor
- ROM read-only memory
- RAM random access memory
- non-volatile storage Other hardware, conventional andyor custom, may also be included.
- any switches shown in the figures are conceptual only. Their function may be carried out through the operation of program logic, through dedicated logic, through the interaction of program control and dedicated logic, or even manually, the particular technique being selectable by the implementer as more specifically understood from the context.
- any element expressed as a means for performing a specified function is intended to encompass any way of performing that function including, for example, a) a combination of circuit elements that performs that function or b) software in any form, including, therefore, firmware, microcode or the like, combined with appropriate circuitry for executing that software to perform the function.
- the invention as defined by such claims resides in the fact that the functionalities provided by the various recited means are combined and brought together in the manner which the claims call for. It is thus regarded that any means that can provide those functionalities are equivalent to those shown herein.
- the present invention provides a method and apparatus for enabling a channel change in a digital network including, but not limited to, a digital subscribe line (DSL) network.
- DSL digital subscribe line
- the present invention provides an improvement over prior art systems such as the second prior art system described above, by minimizing bandwidth consumption in, e.g., a local loop of a DSL network, as compared to the prior art.
- prior art systems such the second prior art system described above, both the normal and channel change stream are sent over the DSL link (local loop) when a channel change request is made, thereby resulting in a problem of increased bandwidth until the CPE initiates a "leave" request on the channel-change stream.
- the present invention solves this problem.
- the architecture 100 includes a content provider 110, a regional broadband network 120, a digital subscriber line access multiplexer (DSLAM) 130, a local loop 140, and a set top box (STB) 150.
- the content provider 110 includes a video encoder 112 having a first and a second output in signal communication with a first and second input, respectively, of a multiplexer 114.
- An output of the multiplexer 114 provides an output of the content provider 110, which is connected in signal communication with the regional broadband network 120.
- the regional broadband network 120 is further connected in signal communication with an input of the DSLAM 130.
- the DSLAM 130 includes a demultiplexer 132 having a first output in signal communication with an input of an l-picture detector 133 and a second output in signal communication with an input of an l-picture detector 134.
- An output of the l-picture detector 133 is connected in signal communication with a first input of channel change selection logic 135 and with a first input of a delay device 136.
- An output of the I- picture detector 134 is connected in signal communication with a second input of the channel change selection logic 135 and with an input of a storage device 137.
- a first output of the channel change selection logic 135 is connected in signal communication with a second input of the delay device 136.
- a second output of the channel change selection logic 135 is connected in signal communication with a first input of a selector 138.
- An output of the delay device is connected in signal communication with a second input of the selector 138.
- An output of the storage device 137 is connected in signal communication with a third input of the selector 138.
- a first input of the DSLAM 130 is connected in signal communication with an input of the demultiplexer 132, a second input of the DSLAM 130 is connected in signal communication with a third input of the selector 138, and an output of the DSLAM 130 is connected in signal communication with an output of the selector 138.
- the second input and the output of the DSLAM 130 are connected in signal communication with the local loop 140.
- the DSLAM 130 is also interchangeably referred to herein as a "channel change processing unit".
- the STB 150 includes a user interface 152 and a video decoder 154. An output of the STB 150 is connected in signal communication with the local loop 140 and with the user interface 152, and an input of the STB 150 is connected in signal communication with the local loop 140 and with the video decoder 154.
- the 1-picture detectors 133, 134 are for detecting l-pictures in the normal stream.
- the delay device 136 is for providing a variable delay.
- the video encoder 112 creates both a normal stream and a channel change stream of coded pictures.
- the normal stream and channel change stream are multiplexed 114 together and transmitted over a regional broadband network 120 to the DSLAM 130.
- a regional broadband network 120 For the sake of simplicity with respect to FIG. 1, only a single program's encoder is shown. In an actual system, multiple programs are supported and, thus, blocks in the figure are duplicated for each supported program.
- a user makes a channel change request through the user interface 152 in the STB 150, to indicate a switch to a new program to be viewed. This request is forwarded to the DSLAM 130.
- the channel change stream is stored in storage local (e.g., local storage device 136) to the DSLAM 130 (or remote storage which may be quickly accessed by the DSLAM 130).
- the normal stream is transmitted over the local loop 140 to the video decoder 154 at the STB 150.
- a channel change request is initiated by the user interface of the STB 150, it is sent to the DSLAM 130 through the local loop 140.
- the DSLAM 130 Upon receiving the channel change request, the DSLAM 130 begins to send the stored channel change stream of the new program to the STB 150, beginning with an l-picture in the channel change stream, instead of the normal stream.
- the DSLAM 130 switches back to transmitting the normal stream to the STB 150.
- Sending the channel change stream in addition to the normal stream increases the bandwidth requirement over the regional broadband network 120. This increase is bandwidth is sustained until a "leave" request on the channel change stream is initiated by the STB 150.
- DSLAM or upstream processing element instrumenting the channel change request, hereinafter referred to as "DSLAM” 130
- DSLAM upstream processing element instrumenting the channel change request
- the DSLAM 130 is capable of detecting when an l-picture is presented on any input stream, e.g., using l-picture detectors 133, 134.
- the DSLAM first switches the channel-change stream automatically to the STB 150 at the next available l-picture.
- the DSLAM sets a flag to inspect the arrival of the subsequent l-picture on the normal stream.
- the channel change stream has more frequent l-picture while the normal stream has less frequent I- pictures.
- the subsequent l-picture has arrived on the normal stream, it is switched to serve the customer who made the original request.
- the present invention is more bandwidth efficient in the DSL link (local loop 140), but does require the DSLAM 130 (or upstream channel change processing element) to keep track of the switch between the channel change and normal stream functions.
- a begin block 210 passes control to a decision block 220.
- the decision block 220 determines whether or not a channel change request has been received to play a current program. If the channel change request has not been received, then control passes back to decision block 220. Otherwise, if the channel change request has been received, then control passes to a function block 222.
- the function block 222 sends a channel change stream coded l-picture, and passes control to a function block 224.
- the function block 224 sets a flag to inspect the arrival of a subsequent l-picture on the normal stream, and passes control to a decision block 226.
- the decision block 226 determines whether or not the subsequent l-picture has arrived on the normal stream. If the subsequent l-picture has not yet arrived on the normal stream, then control is returned to decision block 226. Otherwise, if the subsequent I- picture has arrived on the normal stream, then control is passed to a function block 240.
- the function block 240 sends the normal stream (including the subsequent I- picture) to the individual/device requesting the channel change, and passes control to a function block 245.
- the function block 245 resets the flag, and passes control to a decision block 250.
- the decision block 250 determines whether or not a channel change request has been received to exit a current program. If the channel change request has not been received, then control passes back to function block 240. Otherwise, if the channel change request has been received, then control passes to an end block 260.
- the teachings of the present invention are implemented as a combination of hardware and software.
- the software is preferably implemented as an application program tangibly embodied on a program storage unit.
- the application program may be uploaded to, and executed by, a machine comprising any suitable architecture.
- 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.
- CPU central processing units
- RAM random access memory
- I/O input/output
- the computer platform may also include an operating system and microinstruction code.
- the various processes and functions described herein may be either part of the microinstruction code or part of the application program, or any combination thereof, which may be executed by a CPU.
- peripheral units may be connected to the computer platform such as an additional data storage unit and a printing unit.
- additional data storage unit may be connected to the computer platform.
- printing unit may be connected to the computer platform.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US63347504P | 2004-12-06 | 2004-12-06 | |
PCT/US2005/024936 WO2006062551A1 (en) | 2004-12-06 | 2005-07-15 | Network managed channel change in digital networks |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1836800A1 true EP1836800A1 (en) | 2007-09-26 |
EP1836800A4 EP1836800A4 (en) | 2014-06-04 |
Family
ID=38442151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05771079.0A Withdrawn EP1836800A4 (en) | 2004-12-06 | 2005-07-15 | Network managed channel change in digital networks |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1836800A4 (en) |
JP (1) | JP4823232B2 (en) |
KR (1) | KR20070091123A (en) |
CN (1) | CN100539506C (en) |
WO (1) | WO2006062551A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9456243B1 (en) | 2003-06-06 | 2016-09-27 | Arris Enterprises, Inc. | Methods and apparatus for processing time-based content |
US20110191813A1 (en) * | 2010-02-04 | 2011-08-04 | Mike Rozhavsky | Use of picture-in-picture stream for internet protocol television fast channel change |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1383334A2 (en) * | 2002-07-17 | 2004-01-21 | Matsushita Electric Industrial Co., Ltd. | Video data transmitting apparatus, video data receiving apparatus, and broadcasting system |
US20040034864A1 (en) * | 2002-08-13 | 2004-02-19 | Barrett Peter T. | Seamless digital channel changing |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10190617A (en) * | 1996-12-20 | 1998-07-21 | Matsushita Electric Ind Co Ltd | Video signal decoding device |
US6598231B1 (en) * | 1998-09-08 | 2003-07-22 | Asvan Technology, Llc | Enhanced security communications system |
US6587476B1 (en) * | 1999-05-26 | 2003-07-01 | 3 Com Corporation | Ethernet frame encapsulation over VDSL using HDLC |
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 |
US8397269B2 (en) * | 2002-08-13 | 2013-03-12 | Microsoft Corporation | Fast digital channel changing |
-
2005
- 2005-07-15 WO PCT/US2005/024936 patent/WO2006062551A1/en active Application Filing
- 2005-07-15 KR KR1020077012204A patent/KR20070091123A/en not_active Application Discontinuation
- 2005-07-15 JP JP2007544329A patent/JP4823232B2/en not_active Expired - Fee Related
- 2005-07-15 CN CNB2005800419226A patent/CN100539506C/en not_active Expired - Fee Related
- 2005-07-15 EP EP05771079.0A patent/EP1836800A4/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1383334A2 (en) * | 2002-07-17 | 2004-01-21 | Matsushita Electric Industrial Co., Ltd. | Video data transmitting apparatus, video data receiving apparatus, and broadcasting system |
US20040034864A1 (en) * | 2002-08-13 | 2004-02-19 | Barrett Peter T. | Seamless digital channel changing |
Non-Patent Citations (2)
Title |
---|
KARCZEWICZ M ET AL: "A Proposal for SP-frames:VCEG-L27", ITU TELECOMMUNICATIONS STANDARDIZATION SECTOR VCEG-L27, XX, XX, 9 January 2001 (2001-01-09), pages 1-9, XP002287038, * |
See also references of WO2006062551A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP4823232B2 (en) | 2011-11-24 |
WO2006062551A1 (en) | 2006-06-15 |
CN101073223A (en) | 2007-11-14 |
EP1836800A4 (en) | 2014-06-04 |
CN100539506C (en) | 2009-09-09 |
KR20070091123A (en) | 2007-09-07 |
JP2008523659A (en) | 2008-07-03 |
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