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

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

H - Electricity

04

Q

344/14, 379/80

H04Q 3/58 (2006.01) H04M 1/58 (2006.01) H04M 1/76 (2006.01) H04M 3/56 (2006.01)

Patent

CA 1321252

SIDE-TONE ADJUSTING SYSTEM AND METHOD FOR KEY TELEPHONE SYSTEM ESTABLISHING A PLUREL KINDS OF SPEAKING PATHS ABSTRACT OF THE DISCLOSURE The present invention disclose a switchong 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 whitch 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, repesenting 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.

613595

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