Patent ID: 6757387
Filing Date: 2004-06-29
Classification: H04M

Abstract:
A supplementary hand free transceiver of a fixing network wired telephone installed to a wired telephone for being utilized in a non-built-in, non-amplified hand free transceiver, comprising:a circuit converting box suitable for various types of transceivers of wired telephones; connecting wires for the circuit converting box; and a head wearing or ear hanging hand-free transceivers; wherein the circuit converting box of the transceiver includes an input receptacle J-1 connected to an original hand holding transceiver receptacle, connecting wires L-1, a receptacle J-2 for retaining functions of the original hand holding receiver; a hand holding or hand free switch SW-1, a switch SW-2 for forming a predetermined arrangement from various arrangement; a switch SW-3 for forming a predetermined positive and negative polarity connection of a speaker of a microphone from various different positive and negative polarity connections, a transceiver receptacle J-3 with four joints which are not grounded in common; a transceiver receptacle J-4 with three joints which are grounded in common; an audio matching transformer T-1 for converting a structure of four joints not being grounded in common into a structure of three joints being grounded in common; and J-1 is connected to an original transceiver receptacle J-0 through the connecting wires L-1, then J-1 is connected to switch SW-1, then the hand holding wire connection of the switch SW-1 is connected to J-2; then the original transceiver receptacle is inserted into the J-2; then the switch SW-1 is placed in the hand hold position, thereby, a hand hold function of the original telephone is complete; the hand free transceiver joint point of switch SW-1 is connected to switch SW-2 and switch SW-3 so that the connecting wires and polarities are reordered to a predetermined order; then the connection connected to J-3, T-1 and J-4 are installed for a structure of three joints being grounded in common; a hand free receptacle is inserted into J-3 or J-4, and then switch SW-1 is placed in a hand free position; as a result, a hand free function of the present invention is completed.