Multiple clock rate teleconferencing network

Details Multiple clock rate teleconferencing network Multiple clock rate teleconferencing network

1990-02-28

1991-12-10

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 84, 370 851, 3701101, 379202, 358 85, H04Q 1104, H04J 322, H04M 356

Patent

active

050724428

ABSTRACT:
A hub-resident data switching apparatus for a multinode teleconferencing network enables plural node sites, operating at differing clock rates, to communicate with each other asynchronously and simultaneously. The switching apparatus includes an internal TDM bus to which plural node interface units, an audio combiner unit and a timing and control unit are coupled. Each node interface unit is associated with a respective node and is operative to receive and forward communication signals with respect to its node at the clock rate of the service used by that node. The hub's TDM bus includes a video/PC file bus and an audio/command bus and operates at a clock rate that is a multiple of the number of nodes in the network times the highest clock frequency of any node in the network divided by the bit width of the TDM bus. Each unit interfaces with the TDM bus by way of a pipeline bus interface unit. The audio combiner unit outputs digitized `combined audio` signal packets onto the audio bus for transmission to its associated node. The output section of the audio combiner unit includes an audio packet input buffer whose contents are processed in dependence upon the occupancy status of each audio packet input buffer in the combiner. As long as there is sufficient audio data stored in one or more buffers to ensure effectively continuous audio processing, audio data is processed and forwarded for transmission. If the audio packet input buffers have very little or no audio data, then processing is delayed.

REFERENCES:
patent: 4479195 (1984-10-01), Herr et al.
patent: 4589107 (1986-05-01), Middleton et al.
patent: 4748618 (1988-05-01), Brown et al.
patent: 4847829 (1989-07-01), Tomplins et al.

Affiliated with

Also associated with

Rating

Multiple clock rate teleconferencing network does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multiple clock rate teleconferencing network, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple clock rate teleconferencing network will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1046268