H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/10
H04B 7/14 (2006.01)
Patent
CA 1085463
ABSTRACT OF THE DISCLOSURE ???? V.I. ????? No. 3,?42,350-???? October 15, 1974, reaches symbollic communication system in which subscribers are converted in each other by appropriate assignment of two different transmitting frequencies to two parties, each bring assigned a receiving frequency matching ????'s transmitting frequency. When third party (in co??caes: case, operator) must communicate with both subscribers, prior art requires operator to have as a minimum two receivers whose outputs are mixed to operator headset and two transmitters fed from operator micro- phone. One pair of operator transmitter and receiver communicates with one subscriber, the other pair com- municates with other subscriber; but subscribers can not communicate with each other. This is somewhat inconvenient for operator intervention and, of course, intolerable if a conference connection is required. A conference facility may be provided by cross connecting the output of each receiver to its opposite transmitter via a conference bridge which also includes the operator headset and microphone. With such an arrangement, in the general case, intelligence from the first party passes up to the relay, down from the relay to the operator position, through the conference bridge, up to the relay from the operator position, and down to the second party. These are thus two up-and-down "hops" to the relay; these produce a delay which is subjectively very objectionable. This prior art method, whether of not a conference bridge is employed, also required changing of frequency assignments each time the operator enters the conversation, which incurs some time delay. Present invention teaches provision of second receiver tuned to operating transmitter frequency, at both subscriber positions, the operator having only a single transmitter, but having two receivers tuned to the respective transmitting frequencies originally assigned to the subscribers for communication between them. Thus operator intervention does not interrupt conver- sation between subscribers, and time for necessary setting of receiver and transmitter frequencies is confined to those for operator communication. The basic principle may be expanded to generalized con- ference calls among any number of parties.
265843
Company General Electric
Eckersley Raymond A.
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