Patent ID: 7006625

Claim:
A cordless telephone-to-sound card interface adapter for providing mobility to an end user during voice communications over the Internet, comprising: a housing unit; a hybrid transformer circuit carried in the housing unit; the hybrid transformer circuit including: a first hybrid transformer; a second hybrid transformer coupled to the first hybrid transformer; an impedance matching circuit coupled to the first and the second hybrid transformers; the first hybrid transformer including a coil A which is inductively coupled with coils B and C formed along the same core; the second hybrid transformer including a coil F which is inductively coupled with coils D and E formed along the same core; a telephone jack coupled to the first and the second hybrid transformers and being configured to connect to a cordless telephone system with a telephone cord; a speaker plug contact for coupling to a speaker plug which is configured to connect to a speaker jack of a computer sound card; a microphone plug contact for coupling to a microphone plug which is configured to connect to a microphone jack of the computer sound card; a speaker jack which is configured to connect with an external speaker; a microphone jack which is configured to connect with an external microphone; a first terminal of the coil C and a first terminal of the coil E coupled to the telephone jack; a second terminal of the coil C coupled to a second terminal of the coil E; first and second terminals of the coil A for coupling to the speaker plug; first and second terminals of the coil F for coupling to the microphone plug; a first terminal of the coil B coupled to a second terminal of the coil D; a second terminal of the coil B and a first terminal of the coil D coupled to the impedance matching circuit; a control circuit; the control circuit being operative to switchably connect the speaker and the microphone plug contacts to the first and the second hybrid transformers, respectively, in response to detecting a telephone off-hook condition; and the control circuit being operative to switchably connect the speaker and the microphone plug contacts to the speaker and the microphone jacks, respectively, in response to detecting a telephone on-hook condition.