Global Patent Index - EP 0986915 A1

EP 0986915 A1 2000-03-22 - TRANSMISSION OF MPEG-2 ENCODED VIDEO IN ATM NETWORKS

Title (en)

TRANSMISSION OF MPEG-2 ENCODED VIDEO IN ATM NETWORKS

Title (de)

TRANSMISSION VON MPEG-2 VIDEO IN ATM NETZWERKEN

Title (fr)

TRANSMISSION VIDEO CODEE EN MPEG-2 DANS DES RESEAUX MTA

Publication

EP 0986915 A1 (EN)

Application

EP 98917867 A

Priority

  • SE 9800648 W
  • SE 9701415 A

Abstract (en)

[origin: WO9847293A1] A telecommunications transmission system adapted for the transmission of MPEG-2 data streams with a variable bit rate includes an encoder and decoder. The encoder includes a system layer multiplexer adapted to empty a video encoder buffer by reading data blocks therefrom, at a bit rate which is constant within a block. The encoder provides a way of realising VBR in an MPEG-2 system layer multiplexer which has been adapted for ATM, and represents a particularly simple implementation of a VBR MPEG-2 encoder having good jitter control. The encoder eliminates the need for a special "cell shaping" function in order to fulfil a traffic contract. To recover bit timing in the MPEG-2 decoder, data is buffered in a reception buffer. By continuously reading the deviation of the buffer level, i.e. the level to which the buffer is filled with data, from its nominal value, in this buffer, the deviation of the emptying rate of the buffer, from the nominal bit rate, can be controlled with a phase lock loop (PLL), or similar arrangement.

IPC 1-7 (main, further and additional classification)

H04N 7/62

IPC 8 full level (invention and additional information)

G06T 9/00 (2006.01); H04N 21/236 (2011.01); H04N 21/434 (2011.01)

CPC (invention and additional information)

H04N 21/434 (2013.01); G06T 9/007 (2013.01); H04N 21/236 (2013.01)

Citation (search report)

See references of WO 9847293A1

Designated contracting state (EPC)

CH DE DK FI FR GB LI NL SE

EPO simple patent family

WO 9847293 A1 19981022; EE 9900491 A 20000615; EP 0986915 A1 20000322; NO 994939 D0 19991011; NO 994939 L 19991216; SE 519917 C2 20030422; SE 9701415 D0 19970416; SE 9701415 L 19981017

INPADOC legal status


2006-09-13 [18R] REFUSED

- Effective date: 20060406

2004-05-26 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20040414

2000-03-22 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19991116

2000-03-22 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): CH DE DK FI FR GB LI NL SE

2000-03-22 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: LT PAYMENT 19991116;LV PAYMENT 19991116