Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1989-05-30
1991-02-19
Ng, Jin F.
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379 54, 358 85, H04N 712, H04N 714
Patent
active
049950711
ABSTRACT:
A video conference installation has transmission and reception devices for handling audio and video signals from a plurality of subscriber points via a shared processor which assigns individual subscriber units to the subscriber points. A digital communication system connects subscriber telephone sets (F) to the shared processor via subscriber circuits (AL) having two utility channels and a signalling channel. Audio is pulse code modulated for transmission over one utility channel and compressed video is transmitted over the other. Each subscriber point has a video monitor (B) and video camera (K). Control symbols (SS, SY) are displayed on the subscriber's monitor via an overlay generator (OG). The subscriber can initiate control and switching actions by pointing to displayed symbols on the screen using a cursor, light pen or position sensitive screen input.
REFERENCES:
patent: 4253000 (1981-02-01), Kasson
patent: 4516156 (1985-05-01), Fabris et al.
patent: 4650929 (1987-03-01), Boerger et al.
patent: 4893326 (1990-01-01), Duran et al.
Zukunftssichere Kommunikation mit Integral Von TN, TN-Nachrichten 1986, Heft 89, pp. 3-27.
Nachrichtenvermittlung, Grundsatze und Systemmerkmale bei Fernsprech-und Datennetzen, Hoeckley Oden, pp. 85-90.
Loos Rolf
Weber Jens
Ng Jin F.
Telenorma Telefonbau und Normalzeit GmbH
Woo Stella L.
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