CA2629320A1 - Expedited digital signal decoding - Google Patents

Expedited digital signal decoding Download PDF

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Publication number
CA2629320A1
CA2629320A1 CA002629320A CA2629320A CA2629320A1 CA 2629320 A1 CA2629320 A1 CA 2629320A1 CA 002629320 A CA002629320 A CA 002629320A CA 2629320 A CA2629320 A CA 2629320A CA 2629320 A1 CA2629320 A1 CA 2629320A1
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CA
Canada
Prior art keywords
buffer
data rate
data
occupancy level
rate
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.)
Granted
Application number
CA002629320A
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French (fr)
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CA2629320C (en
Inventor
William C. Versteeg
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InterDigital CE Patent Holdings SAS
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Individual
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Publication of CA2629320A1 publication Critical patent/CA2629320A1/en
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Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/22—Traffic shaping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/25—Flow control; Congestion control with rate being modified by the source upon detecting a change of network conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/70—Media network packetisation
    • 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
    • H04N21/21—Server components or server architectures
    • H04N21/222—Secondary servers, e.g. proxy server, cable television Head-end
    • H04N21/2221—Secondary servers, e.g. proxy server, cable television Head-end being a cable television head-end
    • 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
    • H04N21/23406—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving management of server-side video buffer
    • 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]
    • H04N21/40—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
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/44004—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video buffer management, e.g. video decoder buffer or video display buffer
    • 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 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/64—Addressing
    • H04N21/6405—Multicasting
    • 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 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/64—Addressing
    • H04N21/6408—Unicasting

Abstract

Expedited digital signal decoding. A multicast or unicast data stream is sent fro a headend to a set-top box at a natural rate. A decoder buffer in the set-top box begins to fill. Once the buffer is partially full, a decoder begins to decode the data at a rate lower than the natural rate. Images are displayed to the user before the buffer is full, allowing for a faster channel change.

Claims (27)

1. A method for buffering digital signals, the method comprising the steps of:

reading data into a buffer at a first data rate;

obtaining a first occupancy level in said buffer;

outputting data from said buffer at a second data rate, wherein said second data rate is less than said first data rate;

obtaining a second occupancy level in said buffer; and outputting data from said buffer at a third data rate wherein said third data rate is greater than said second data rate.
2. The method of claim 1, wherein said third data rate is equal to said first data rate.
3. The method of claim 1, wherein said first data rate is a natural rate.
4. The method of claim 1, wherein said step of obtaining said second occupancy level comprises the step of allowing said buffer to fill.
5. The method of claim 1, wherein said step of obtaining said second occupancy level comprises the step of obtaining a full buffer.
6. The method of claim 1, further comprising the step of a channel alteration occurring prior to said buffer being full.
7. The method of claim 6, further comprising the step of a channel alteration as a result of outputting data from said buffer at said second data rate.
8. The method of claim 1, further comprising the step of a channel alteration occurring prior to obtaining said second occupancy level.
9. The method of claim 1, further comprising the step of a home communications terminal tuning to a multicast data stream and said buffer reading from said multicast data stream.
10. The method of claim 1, further comprising the step of reading a key frame into said buffer prior to outputting data from said buffer at said second data rate.
11. The method of claim 1, further comprising the step of a home communications terminal tuning to a unicast data stream and said buffer reading from said unicast data stream.
12. The method of claim 11, further comprising the steps of closing said unicast data stream upon reaching a second occupancy level of said buffer and tuning to a multicast data stream to be read into said buffer.
13. A method for buffering digital signals, the method comprising the steps of:
tuning to a unicast data stream;

reading said unicast data stream into a buffer at a first data rate;
obtaining a first occupancy level in said buffer;

outputting data from said buffer at a second data rate, wherein said second data rate is less than said first data rate;

obtaining a second occupancy level in said buffer, wherein said second occupancy level is greater than said first occupancy level;

closing said unicast data stream;
tuning to a multicast data stream;

reading said multicast data stream into said buffer;

obtaining a third occupancy level in said buffer; wherein said third occupancy level is greater than said second occupancy level; and outputting data from said buffer at a third data rate wherein said third data rate is greater than said second data rate.
14. The method of claim 13, wherein said third occupancy level is substantially full.
15. The method of claim 13, wherein said third data rate is equal to said first data rate.
16. The method of claim 13, wherein said first data rate is a natural rate.
17. The method of claim 13, further comprising the step of a channel alteration occurring prior to said buffer being full.
18. The method of claim 17, further comprising the step of a channel alteration as a result of outputting data from said buffer at said second data rate.
19. The method of claim 13, further comprising the step of a channel alteration occurring prior to obtaining said third occupancy level.
20. The method of claim 13, further comprising the step of reading a key frame into said buffer prior to outputting data from said buffer at said second data rate.
21. A decoder buffer for receiving digital signals at a first data rate to obtain a first occupancy level, outputting said data at a second data rate which is less than said first data rate, and obtaining a second occupancy level wherein said second occupancy level is greater than said first occupancy level in order to output said data at a third data rate that is greater than said second data rate.
22. The decoder buffer of claim 21, wherein said third data rate is equal to said first data rate.
23. The decoder buffer of claim 21, wherein said first data rate is a natural rate.
24. The decoder buffer of claim 21, wherein said second occupancy level is a full buffer.
25. The decoder buffer of claim 21, wherein channel alterations may occur prior to said buffer being full.
26. The decoder buffer of claim 21, wherein said data stream is a multicast data stream.
27. The decoder buffer of claim 21, wherein said data stream is a unicast data stream.
CA2629320A 2005-11-11 2006-11-09 Expedited digital signal decoding Active CA2629320C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11/164,147 2005-11-11
US11/164,147 US7873760B2 (en) 2005-11-11 2005-11-11 Expedited digital signal decoding
PCT/US2006/060713 WO2007120261A2 (en) 2005-11-11 2006-11-09 Expedited digital signal decoding

Publications (2)

Publication Number Publication Date
CA2629320A1 true CA2629320A1 (en) 2007-10-25
CA2629320C CA2629320C (en) 2014-04-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2629320A Active CA2629320C (en) 2005-11-11 2006-11-09 Expedited digital signal decoding

Country Status (5)

Country Link
US (1) US7873760B2 (en)
EP (1) EP1946501B1 (en)
CA (1) CA2629320C (en)
DE (1) DE602006013024D1 (en)
WO (1) WO2007120261A2 (en)

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