Digital conference circuit and method

Details Digital conference circuit and method Digital conference circuit and method

1981-06-12

1983-06-07

Robinson, Thomas A.

Multiplex communications

Wide area network

Packet switching

179 18BC, H04M 356, H04Q 1104

Patent

active

043874576

ABSTRACT:
A digital conference circuit for a digital telephone switching network is provided, connected between a receive TDM (time division multiplex) bus carrying PCM (pulse code modulation) words to the conference circuit and a transmit TDM bus carrying PCM words from the conference circuit. A memory (storage) device stores the PCM words most recently received on the receive TDM bus and decision circuitry determines, for each conferee, which two PCM words, excluding the PCM word originating from that conferee, should be read from the memory device. The two PCM words so read are attenuated in a predetermined fashion, summed, and the resultant PCM sum applied to the transmit TDM bus during an appropriate timeslot. The decision circuit makes its decision based upon the largest average magnitude of each conferee's PCM words, received at the conference circuit, during the previous frames. In other words, for transmission on the transmit TDM bus to a given conferee, two PCM words are chosen from amongst the other conferees based upon the largest average magnitude of those conferee's PCM words.

REFERENCES:
patent: 3924082 (1975-12-01), Oliver et al.
patent: 3970797 (1976-07-01), Johnson et al.
patent: 4007338 (1977-02-01), McLaughlin
patent: 4031328 (1977-06-01), Pitroda
patent: 4190744 (1980-02-01), Frank
patent: 4224688 (1980-09-01), Ciancibello et al.

Affiliated with

Also associated with

Rating

Digital conference circuit and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital conference circuit and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital conference circuit and method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2346393