Method system and article of manufacture for multi-casting audio

Details Method system and article of manufacture for multi-casting audio Method system and article of manufacture for multi-casting audio

1996-04-18

1999-01-19

Lall, Parshotam S.

Cryptography

Key management

Having particular key generator

3952003, 39520081, 39520082, 380 7, 380 10, 380 14, 380 15, 379 9321, 379158, 379202, 370260, H04N 715, H04N 974, H04N 976

Patent

active

058623299

ABSTRACT:
A distance learning system consists of a plurality of multi-cast clients of various classes and priorities with one multi-cast client as a primary multi-cast client, a multi-cast server, arbitrator and a distance learning session coordinator. The primary multi-cast client provides the default or primary Audio-Visual Material (AVM) stream. The Multi-Cast Server (MCS) setups a multi-cast over a point to multi-point connection which connects all multi-cast clients that are to take part in a particular distance learning session, along with the Primary multi-cast client. Additionally, the primary multi-cast client is connected to the MCS via a point-to-point link. The multi-cast clients and the primary multi-cast client receive an AVM material stream from the multi-cast server via the point to multi-point connection. When a multi-cast client wishes to speak, a speaking request is sent to the arbitrator, the arbitrator determines whether to grant or deny the speaking request. If permission is granted then a point-to-point link is established between the requesting multi-cast client and the MCS. The requesting multi-cast client then provides an AVM stream to the multi-cast server over the newly established point-to-point connection and the multi-cast server switches or provides the AVM stream associated with the requesting multi-cast Client over the point to multi-point connection. When the requesting multi-cast client is through speaking the MCS switches the AVM stream associated with the primary multi-cast client onto the point to multi-point connection and the point-to-point link with the requesting multi-cast client is terminated.

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IBM Technical Report TR29.2048, Aug. 1995, "Multicast in an IP and ATM Environment", A. M. Gallo.

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