Conference call circuit using reversible analog to digital conve

Details Conference call circuit using reversible analog to digital conve Conference call circuit using reversible analog to digital conve

1978-07-21

1979-07-24

Miller, Charles D.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

179 1CN, 340347C, H04M 300, H03K 1302

Patent

active

041623762

ABSTRACT:
A circuit arrangement is disclosed for individual subscribers in a telecommunication set up. The circuit arrangement converts analog signals into digital signals and digital signals into analog signals. When operated in a conference connection, summation signals are received by a subscriber which contain the subscriber's own share. Output digital signals from the subscriber are stored and converted into an analog value and are then subtracted from the received summation signal converted into an analog value.

REFERENCES:
patent: 3551600 (1970-12-01), Berch
patent: 3828146 (1974-08-01), Lewis
patent: 3971891 (1976-07-01), Wolcott
patent: 4056820 (1977-11-01), Hofer

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