Multiplex communications – Special services – Conferencing
Patent
1995-12-28
1997-01-14
Olms, Douglas W.
Multiplex communications
Special services
Conferencing
370391, 370505, 348 15, H04N 718, H04J 322
Patent
active
055947255
ABSTRACT:
A multipoint video conference system (8) is provided that has video rate control and allows communication of audio, video and data information between end-point units (16). The multipoint video conference system comprises a multipoint control unit (10, 20) having a plurality of interface units (12, 22) located therein. Each interface unit (12, 22) is operable to communicate with other interface units (12, 22) via a backplane (14, 24) of the multipoint control unit (10, 20). A plurality of end-point units (16) are each coupled to an associated interface unit (12, 22). Each end-point unit (16) is operable to communicate and process real data information and operable to receive and resend fill data information. The multipoint control unit (10, 20) is operable, with respect to each participating end-point unit (16) in a data channel, to allow communication of real data information and, with respect to each non-participating end-point unit (16), to allow communication of an equal amount of fill data information. Each interface unit (12, 22) is operable to transmit real data information to a participating end-point unit and to transmit fill data information to a non-participating end-point unit (16). Each non-participating end-point unit (16) is operable to retransmit fill data information back to an associated interface unit (12, 22) such that available bandwidth for video information remains balanced for all end-point units (16) when a data channel is open between participating end-point units (16).
REFERENCES:
patent: 4282400 (1981-08-01), Ribera et al.
patent: 5315633 (1994-05-01), Champa
patent: 5325194 (1994-06-01), Natori et al.
patent: 5371535 (1994-12-01), Takizawa
patent: 5473363 (1995-12-01), Ng et al.
Clements Bill
Tischler Paul V.
Nguyen Chau T.
Olms Douglas W.
Vtel Corporation
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