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1. (WO1997019557) FREQUENCY DRIFT CORRECTION IN SUBSCRIBER TERMINALS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/019557 International Application No.: PCT/US1996/018495
Publication Date: 29.05.1997 International Filing Date: 19.11.1996
Chapter 2 Demand Filed: 18.06.1997
IPC:
H04N 5/44 (2006.01) ,H04N 7/16 (2006.01) ,H04N 7/173 (2006.01) ,H04N 7/20 (2006.01)
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
5
Details of television systems
44
Receiver circuitry
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
7
Television systems
16
Analogue secrecy systems; Analogue subscription systems
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
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
7
Television systems
20
Adaptations for transmission via a GHz frequency band, e.g. via satellite
Applicants:
STANFORD TELECOMMUNICATIONS, INC. [US/US]; 1221 Crossman Avenue Sunnyvale, CA 94088-3733, US
Inventors:
EVANS, Allan; US
CHEN, Horen; US
Agent:
ZEGEER, Jim; 801 North Pitt Street #108 Alexandria, VA 22314, US
Priority Data:
08/599,40621.11.1995US
Title (EN) FREQUENCY DRIFT CORRECTION IN SUBSCRIBER TERMINALS
(FR) CORRECTION DE LA DERIVE DE FREQUENCE DANS DES TERMINAUX D'ABONNES
Abstract:
(EN) A frequency control system and method for minimizing frequency drifts in subscriber terminals in a point-to-multipoint system is described enabling the use of low cost oscillators (5) in the subscriber terminals by measuring the frequency offset (9) of the subscriber terminal's receiver to estimate its oscillator frequency drift which is then used to correct the subscriber terminal's transmitter (12) frequency and also by feedback of a frequency correction from the base station to the subscriber.
(FR) L'invention concerne un système et un procédé de commande de fréquences pour minimiser les dérives de fréquences dans les terminaux d'abonnés, dans un système point à multipoint. Ce système permet d'utiliser des oscillateurs à faibles coûts (5) dans les terminaux d'abonnés en mesurant le décalage de fréquence (9) du récepteur du terminal d'abonnés pour estimer la dérive de la fréquence de son oscillateur qui est, ensuite, utilisée pour corriger la fréquence de l'émetteur du terminal d'abonné (12). En outre, ce système utilise la rétroaction d'une correction de fréquence provenant de la station de base à destination de l'abonné.
Designated States: AU, BR, CA, CN, JP, KR, MX
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
MXPA/a/1998/004013EP0862834JP4354530 CN1203003CA2237465KR1019990071470
AU1997017419