Patent ID: 8666091

Claim:
A multi-port connector circuit, comprising an output port configured to output an output signal; an input port configured to receive an input signal; a single common port connected to a signal path used by the input signal and the output signal in common, wherein the output port and the common port are configured to be coupled to a loudspeaker for outputting the output signal to the loudspeaker, the input port and the common port are configured to be coupled to a microphone for receiving the input signal from the microphone, and the common port is configured to connect to an external electrical conductor, which is electrically connected to both the loudspeaker and the microphone; and a disturbance reduction circuit connected to the common port and the input port, the disturbance reduction circuit being configured to detect a reference signal at the common port, to generate a disturbance reduction signal from the reference signal, and to correct the input signal by means of the disturbance reduction signal, wherein the reference signal comprises a disturbance in the input signal caused by the output signal, the output port, the input port, and the common port being arranged side-by-side on an outside of a mobile device so as to be accessible from external to the mobile device.