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1. (WO1998049836) RF OUTPUT DEVICE FOR CATV
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/049836 International Application No.: PCT/JP1998/001950
Publication Date: 05.11.1998 International Filing Date: 28.04.1998
Chapter 2 Demand Filed: 13.11.1998
IPC:
H04H 1/02 (2006.01) ,H04L 12/28 (2006.01) ,H04N 7/173 (2006.01)
(Deprecated)
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
H
BROADCAST COMMUNICATION
1
Broadcast distribution systems
02
Wired systems
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
12
Data switching networks
28
characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
7
Television systems
16
Analogue secrecy systems; Analogue subscription systems
173
with two-way working, e.g. subscriber sending a programme selection signal
Applicants:
KABUSHIKI KAISHA TOSHIBA [JP/JP]; 72, Horikawa-cho Saiwai-ku Kawasaki-shi Kanagawa 210-0913, JP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, KR, LU, MC, NL, PT, SE)
NAKAGAWARA, Chikashi [JP/JP]; JP (UsOnly)
Inventors:
NAKAGAWARA, Chikashi; JP
Agent:
SUYAMA, Saichi; Kandahigashiyama Building 1, Kandatacho 2-chome Chiyoda-ku Tokyo 101-0046, JP
Priority Data:
9/11142228.04.1997JP
Title (EN) RF OUTPUT DEVICE FOR CATV
(FR) UNITE DE SORTIE HF POUR TELEDISTRIBUTION
Abstract:
(EN) A switch (3) is provided on the upstream line for CATV through which data are transmitted to a base station from each household PC at a final stage having the highest possible signal level so as to output the output of the switch (3) to an output terminal (out) through a buffer circuit (10) incorporated for impedance transformation. Therefore, the performance of an RF output device can be improved and the cost of the device can be reduced, because the occurrence of noise can be minimized when the switch (3) is turned off and no oscillation stopping switch is required for a VCO (5) for preventing carrier leakage.
(FR) L'invention concerne un commutateur (3) disposé sur la voie amont de télédistribution, par laquelle les données sont transmises à une station de base depuis chaque ordinateur domestique, à un étage final, avec le niveau de signal le plus élevé possible, de façon à transmettre la sortie du commutateur (3) à un terminal de sortie (out) par l'intermédiaire d'un circuit tampon (10) incorporé effectuant la transformation d'impédance. Ce système améliore les performances d'une unité de sortie HF et diminue son coût, du fait qu'il minimise la production de bruit quand le commutateur (3) est mis hors circuit et que l'oscillateur commandé en tension (5) n'a pas besoin de commutateur d'arrêt des oscillations pour éviter les résidus de porteuse.
front page image
Designated States: KR, US
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
KR1020010012121EP1014721US6181365