US 6,151,389 AGranted

Telephone

AssigneeInventec Corporation

InventorsJeffrey Lai, Feng Zhang, Ziao-Yun Wang

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Abstract

A telephone, which includes a CPU connected to a keyboard thereof, a first switch connected between first and second telephone lines, second and third switches provided at the first and second telephone lines and connected to the CPU, the second and third switches each having a first contact at the respective output end connected to a fourth switch and a second contact connected to a fifth switch, which controls a hand-free circuit, wherein when the first and second telephone lines are called at the same time, the switches are controlled by the CPU for enabling a first user to pick up one call through the hand-free circuit or talking circuit and a second user to pick up the other call through the talking circuit or hand-free circuit, and a switching can be made through the keyboard to change the connection of the telephone lines between the talking circuit and the hand-free circuit.

Claims4

Dependent claims

A telephone comprising:

a keyboard having a set of function buttons;
a CPU (central processing unit);
at least two telephone lines each connected to a respective ringing circuit, said at least two telephone lines each having a switch respectively connected to said CPU;
a talking circuit connected to said at least two telephone lines through a switch having an input end connected to a first contact at an output end of the switch at each of said telephone line;
a hand-free circuit connected to said at least two telephone lines through a switch having an input end connected to a second contact at the output end of the switch at each of said telephone line;
wherein when said at least two telephone lines are busy, the function buttons of said keyboard are operated to drive said CPU to output control signals to the switches at said at least two telephone lines, said talking circuit and said hand-free circuit, enabling one of said at least two telephone lines to be connected to said hand-free circuit or said talking circuit, so that said talking circuit and said hand-free circuit can be independently operated.

3 more elements

Dependencies are inferred from the claim text.