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1. WO2000041398 - METHOD AND APPARATUS FOR DETECTING AND PREVENTING BANDWIDTH OVERFLOW IN A STATISTICAL MULTIPLEXER

Publication Number WO/2000/041398
Publication Date 13.07.2000
International Application No. PCT/US2000/000406
International Filing Date 06.01.2000
Chapter 2 Demand Filed 04.08.2000
IPC
H04N 7/58 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
7Television systems
24Systems for the transmission of television signals using pulse code modulation
52Systems for transmission of a pulse code modulated with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal
58involving more than one video signal
CPC
H04B 7/2612
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
24for communication between two or more posts
26at least one of which is mobile
2612Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
H04J 3/1682
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
3Time-division multiplex systems
16in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
1682Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
H04J 3/1688
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
3Time-division multiplex systems
16in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
1682Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
1688the demands of the users being taken into account after redundancy removal, e.g. by predictive coding, by variable sampling
H04J 3/247
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
3Time-division multiplex systems
24in which the allocation is indicated by an address ; the different channels being transmitted sequentially
247ATM or packet multiplexing
H04N 21/23406
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
21Selective content distribution, e.g. interactive television or video on demand [VOD]
20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
23Processing of content or additional data; Elementary server operations; Server middleware
234Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
23406involving management of server-side video buffer
H04N 21/23655
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
21Selective content distribution, e.g. interactive television or video on demand [VOD]
20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
23Processing of content or additional data; Elementary server operations; Server middleware
236Assembling 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
2365Multiplexing of several video streams
23655Statistical multiplexing, e.g. by controlling the encoder to alter its bitrate to optimize the bandwidth utilization
Applicants
  • SCIENTIFIC-ATLANTA, INC. [US/US]; Intellectual Property Department (ATL 4.3.517) 5030 Sugarloaf Parkway Lawrenceville, GA 30044, US
Inventors
  • SCHOENBLUM, Joel; US
  • HUANG, Si, Jun; US
Agents
  • MASSARONI, Kenneth, M. ; Scientific-Atlanta, Inc. Intellectual Property Department (ATL 4.3.517) 5030 Sugarloaf Parkway Lawrenceville, GA 30044, US
Priority Data
09/228,02908.01.1999US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR DETECTING AND PREVENTING BANDWIDTH OVERFLOW IN A STATISTICAL MULTIPLEXER
(FR) PROCEDE ET DISPOSITIF DE DETECTION ET DE PREVENTION DE SATURATION PAR EXCES DE LARGEUR DE BANDE DANS UN MULTIPLEXEUR STATISTIQUE
Abstract
(EN)
Techniques for determining an output rate for a bit stream, the output rate being determined by applying information read from the bit stream to available bandwidths. The techniques are employed to construct a statistical multiplexer (80) that multiplexes varying bit-rate bit streams. Minimum and maximum output rates for each bit stream are determined such that neither a queue for the bit stream in the multiplexer nor the bit stream's decoder will underflow or overflow. The multiplexer first allocates each bit stream its minimum bandwidth and then allocates any remaining bandwidth to the bit streams in proportion to the difference between the minimum and maximum output rates for the bit streams, with no bit stream receiving more than its maximum output rate. If there is not enough bandwidth to give every bit stream its minimum rate, glue frames may be inserted, or low priority channels dropped.
(FR)
L'invention concerne des procédés permettant de déterminer un débit de sortie d'un train binaire, le débit de sortie étant déterminé par l'application d'informations lues à partir du train binaire aux largeurs de bande disponibles. Ces procédés sont utilisés pour construire un multiplexeur statistique (80) qui multiplexe des trains binaires à débit binaire variable. On détermine des seuils maximaux et minimaux de débits de sortie pour chaque train binaire de telle sorte que ni une file d'attente du train binaire dans le multiplexeur ni le décodeur du train binaire ne soient sous-passés ou dépassés. Le multiplexeur alloue d'abord sa largeur de bande minimale à chaque train binaire pour ensuite allouer la largeur de bande restante aux trains binaires par rapport à la différence entre les débits de sortie minimaux et maximaux des trains binaires, aucun train binaire ne recevant un seuil maximal de débit de sortie plus élevé que le sien. Si la largeur de bande est insuffisante pour assurer à chaque train binaire son débit minimal, il est possible d'insérer des trames de collage ou de supprimer des canaux à basse priorité.
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