Patent ID: 7983722

Claim:
A headset for use with a mobile communication device for wireless voice and data communication, said headset comprising: a jack plug sized and shaped to be received in a port in said mobile communication device, first and second speakers, speaker wires connecting the first and second speakers to the jack plug, a microphone, a microphone wire connecting the microphone to the jack plug, a ground wire coupled to the jack plug, a plurality of control buttons, said control buttons comprising a first button to increase speaker volume and a second button to decrease speaker volume, and a controller coupled to the buttons for receiving input commands and coupled to the microphone wire for transmitting a control signal to the jack plug, wherein the control signal is encoded in an encoding control signal mode comprising a series of voltage pulses, each pulse representing a difference in voltage across the microphone wire relative to the ground wire, said controller being configured to transmit a first pulse series in response to activation of the first button to input a command to increase speaker volume and a second pulse series in response to activation of the second button to input a command to decrease speaker volume.