Global Patent Index - EP 1053638 A1

EP 1053638 A1 2000-11-22 - DATA TRANSMISSION IN A TELEVISION SIGNAL USING QUADRATURE AMPLITUDE MODULATION

Title (en)

DATA TRANSMISSION IN A TELEVISION SIGNAL USING QUADRATURE AMPLITUDE MODULATION

Title (de)

DATENÜBERTRAGUNG IN EINEM FERNSEHSIGNAL MITTELS QUADRATUR-AMPLITUDENMODULATION

Title (fr)

EMISSION DE DONNEES DANS UN SIGNAL DE TELEVISION PAR MODULATION D'AMPLITUDE EN QUADRATURE

Publication

EP 1053638 A1 (EN)

Application

EP 99965408 A

Priority

  • EP 99965408 A
  • EP 9909204 W
  • EP 98204138 A

Abstract (en)

[origin: WO0035195A1] Method and system for transmitting data in lines of a video signal. The data is packetized (12), provided with a clock-run-in sequence (13) and quadrature amplitude-modulated (14), using a carrier (f>c<) which is located in the middle of the video bandwidth. The modulated data signal is then inserted (15) in selected video lines. In the preferred embodiment, QAM-16 is used so that data can be transmitted in the vertical blanking interval of a television signal at a higher bit rate (approximately 16 Mbit/s) than conventional teletext (6.9 Mb/s). Optionally, QAM-64 or even QAM-256 may be used to obtain a bit rate of approximately 24 or 32 Mbit/s, respectively.

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

H04N 7/081; H04N 7/088

IPC 8 full level (invention and additional information)

H04N 7/08 (2006.01); H04L 27/34 (2006.01); H04N 7/081 (2006.01); H04N 7/088 (2006.01)

CPC (invention and additional information)

H04N 7/088 (2013.01); H04N 7/081 (2013.01)

Citation (search report)

See references of WO 0035195A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 0035195 A1 20000615; AU 2093800 A 20000626; EP 1053638 A1 20001122; JP 2002532974 A 20021002

INPADOC legal status


2001-10-31 [18W] WITHDRAWN

- Date of withdrawal: 20010907

2001-02-07 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20001215

2000-11-22 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE