Side-tone adjusting system and method for key telephone system e

Details Side-tone adjusting system and method for key telephone system e Side-tone adjusting system and method for key telephone system e

1989-09-25

1991-02-26

Dwyer, James L.

Telephonic communications

Special services

Conferencing

379391, 379394, H04M 100, H04M 176, H04M 356

Patent

active

049967100

ABSTRACT:
The present invention disclose a switching system including an exchange coupled to a plurality of central office lines and PBX's telephone lines, and a plurality of telephone sets. Each telephone set includes a side-tone adjusting circuit which adjusts a side-tone in response to a balanced impedance to obtain a suitable side-tone. When the exchange receives a speaking path selection request, representing one of the lines, from the telephone set, it determines one of a plurality of predetermined impedance information and makes a speaking path between the selected line and the telephone set. The telephone set selects one of the balanced impedances in response to the determined impedance information.

REFERENCES:
patent: 3083265 (1963-03-01), Paulaitis et al.
patent: 4887293 (1989-12-01), Molnay

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