EP 1051633 A4 20010822 - TESTING OF CATV SYSTEMS
Title (en)
TESTING OF CATV SYSTEMS
Title (de)
PRÜFEN EINES KABELFERNSEHSYSTEMS
Title (fr)
VERIFICATION DE SYSTEMES CATV
Publication
Application
Priority
- US 9901432 W 19990122
- US 7240998 P 19980123
Abstract (en)
[origin: WO9938023A1] A method and apparatus for determining the location of an impedance mismatch in a digital communication circuit (22) generates (20) at least quasi-random data, transmit the data along the circuit (22) from a transmitting end of the circuit (22), recover (24) reflections from impedance mismatches in the circuit (22) adjacent the transmitting end of the circuit (22), correlate the reflections with the data to generate a correlation result, identify a reflection peak in the result, and multiply the propagation velocity of the data through the circuit (22) by a time delay to the reflection peak.
IPC 1-7
IPC 8 full level
H04B 3/46 (2006.01); H04N 17/00 (2006.01); H04L 12/26 (2006.01); H04L 12/28 (2006.01)
CPC (source: EP)
H04B 3/46 (2013.01); H04N 17/00 (2013.01); H04L 12/2801 (2013.01); H04L 43/50 (2013.01)
Citation (search report)
- [X] WO 9307687 A1 19930415 - BRITISH TELECOMM [GB]
- [X] WO 9605665 A1 19960222 - NORTHERN TELECOM LTD [CA], et al
- [X] WO 9211710 A1 19920709 - BRITISH TELECOMM [GB]
- [X] US 4041381 A 19770809 - HWA LIM CHING
- [X] PATENT ABSTRACTS OF JAPAN vol. 016, no. 577 (P - 1460) 16 December 1992 (1992-12-16)
- See references of WO 9938023A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9938023 A1 19990729; AU 2338099 A 19990809; CA 2315759 A1 19990729; EP 1051633 A1 20001115; EP 1051633 A4 20010822
DOCDB simple family (application)
US 9901432 W 19990122; AU 2338099 A 19990122; CA 2315759 A 19990122; EP 99903329 A 19990122