EP 0891673 A1 19990120 - BUFFER CONTROL IN A CODED DATA TRANSMISSION SYSTEM
Title (en)
BUFFER CONTROL IN A CODED DATA TRANSMISSION SYSTEM
Title (de)
BUFFERREGELUNG IN EINEM ÜBERTRAGUNGSSYSTEN MIT KODIERTEN DATEN
Title (fr)
COMMANDE DE TAMPON DANS UN SYSTEME DE TRANSMISSION DE DONNEES CODEES
Publication
Application
Priority
- GB 9700948 W 19970404
- GB 9607162 A 19960404
Abstract (en)
[origin: WO9738532A1] According to one aspect of the present invention there is provided a method of changing the throughput of data in a digital data transmission system, comprising, monitoring the rate of data input to an encoder buffer to determine the decoder buffer requirements downstream; and controlling the encoder buffer in response to the monitoring step such that a change in the rate of data output from the encoder is lagged by a predetermined time period from any change in rate of data input to the encoder buffer. This predictive technique achieves the requirement of instantly changing bitrate in a seamless manner. A seamless bitrate change implies that there is no break in the decoding of the bitstream at the receiver, and also no abnormal artefacts at the receiver. Therefore to change bitrate seamlessly the receiver buffer should not be overflowed or underflowed, and the time stamp offset in the bitstream (the rate buffer delay) should remain constant so that the receiver need not gain or skip frames.
IPC 1-7
IPC 8 full level
H04J 3/00 (2006.01); H04J 3/04 (2006.01); H04L 13/08 (2006.01); H04N 7/24 (2006.01); H04N 7/26 (2006.01); H04N 7/32 (2006.01); H04N 7/58 (2006.01)
CPC (source: EP)
H04N 19/152 (2014.11); H04N 21/23406 (2013.01); H04N 21/2365 (2013.01); H04N 21/23655 (2013.01); H04N 21/2401 (2013.01); H04N 19/50 (2014.11)
Citation (search report)
See references of WO 9738532A1
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
WO 9738532 A1 19971016; EP 0891673 A1 19990120; GB 9607162 D0 19960612; JP 2001502125 A 20010213
DOCDB simple family (application)
GB 9700948 W 19970404; EP 97915597 A 19970404; GB 9607162 A 19960404; JP 53595997 A 19970404