Digital type telephone system having a conference function

Details Digital type telephone system having a conference function Digital type telephone system having a conference function

1978-06-28

1980-05-13

Morrison, Malcolm A.

179 18BC, H04M 356

Patent

active

042030056

ABSTRACT:
This digital telephone conference system provides improved cancellation of reflective signals which cause echo-singing problems, such as caused by hydrid mismatches, for any number of telephone sets. Each telephone set is sequentially sampled for time sharing, and alternate samples are given opposite polarity signs before being summed, thereby making approximately half of the signals of opposite phase, for any number of telephone sets, for effective cancellation. Also, each member of the conference receives a sum signal of all telephone sets except his own.

REFERENCES:
patent: 3882276 (1975-05-01), Feiner et al.
patent: 3924082 (1975-12-01), Oliver et al.
patent: 3983332 (1976-09-01), Patten

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