Multiplex communications – Wide area network – Packet switching
Patent
1982-06-28
1985-01-22
Brown, Thomas W.
Multiplex communications
Wide area network
Packet switching
370109, H04M 356
Patent
active
RE0318140
ABSTRACT:
A three-party conference circuit provides for three-party conference calls in time-division-multiplex communication systems utilizing pulse-code modulation. The digitized speech signals from a selected group of channels are received from an incoming PCM highway, expanded from PCM coding to linear coding and consecutively stored in groups of three in three registers. Different pairs of the registers are selected by a multiplexer, after which the speech signals from the selected pairs of registers are added to provide a combined speech signal. The combined speech signals are compressed from linear coding to PCM coding and applied to an outgoing PCM highway for transmission to the respective parties. Since the speech signals are combined and retransmitted essentially within the same frame, time delay distortion of the audio signals is minimized. In addition, the three-party conference circuit provides for a diagnostic mode of operation where incoming speech signals are retransmitted and a broadcast mode of operation where the speech signals from one channel are combined with each of the other channels of the selected group of channels to be transmitted.
REFERENCES:
patent: 3958084 (1976-05-01), Nicholas
patent: 4054757 (1977-10-01), LeJay
patent: 4076966 (1978-02-01), Bovo et al.
patent: 4153817 (1979-05-01), D'Ortenzio
patent: 4160878 (1979-07-01), Hirschmann et al.
patent: 4190744 (1980-02-01), Frank
Brown Thomas W.
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
Roney Edward M.
LandOfFree
Three-party conference circuit for digital time-division-multipl does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Three-party conference circuit for digital time-division-multipl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Three-party conference circuit for digital time-division-multipl will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-559592