Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit
Reexamination Certificate
2006-02-28
2006-02-28
Tran, Sinh (Department: 2646)
Telephonic communications
Subscriber line or transmission line interface
Hybrid circuit
C379S402000, C379S404000, C379S413020, C379S413030, C379S413040
Reexamination Certificate
active
07006625
ABSTRACT:
A cordless telephone-to-sound card interface adapter provides a connection between any standard cordless telephone system and a sound card of a computer for PC-to-PC or PC-to-telephone voice communications over the Internet. The interface adapter includes a hybrid transformer circuit for interfacing a two-wire circuit of the cordless telephone and a four-wire circuit of the computer sound card. Consisting of passive components, this hybrid transformer circuit cancels out the voice echo that would otherwise exist due to mismatched impedances between the two media and/or from leakage of the signal being transmitted and received on the same pair of telephone lines. Preferably, a Universal Serial Bus (USB) interface is provided to supply a bias voltage to the cordless telephone system through the interface adapter. The interface adapter may also include interfaces for connecting with external computer speakers and microphone, and a control circuit for automatically switchably coupling the computer sound card to either the cordless telephone or the external speakers and microphone as appropriate.
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U.S. Appl. No. 10/743,644; Rodriguez; Entitled “Cordless Telephone -To-Sound Card Interface Adapter Having a Hybrid Transformer Circuit”, file date Dec. 22, 2003.
Herrig Hanz Werner
Rodriguez Luis Ricardo
NVG, Inc.
Oskorep, Esq. John J.
Singh Ramnandan
LandOfFree
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