Patent ID: 7241179

Claim:
A jack to interconnect with three- and four-contact audio plugs, said jack comprising: a first contact arranged to contact a first segment of both three- and four-contact audio plugs; a second contact arranged to contact a second segment of both three- and four-contact audio plugs; a third contact arranged to contact a third segment of both three- and four-contact audio plugs; and a fourth contact arranged to contact the third segment of three-contact audio plugs and a fourth segment of four-contact audio plugs; and wherein the jack connects to an audio circuit that includes a microphone input, and stereo audio outputs, and wherein the first contact is coupled to the microphone input, the second contact is coupled to one of the stereo audio outputs, the third contact is coupled to a circuit ground of the audio circuit, and the fourth contact is coupled to the other stereo audio output.