Method and apparatus for noise cancellation in a wireless mobile device using an external headset

A method of performing noise cancellation in a system, wherein the system includes a wireless unit (WU), wherein the WU includes a processor, a memory, a user interface, a connector, one or more internal microphones, and one or more internal speakers, and a headset removably connected to the WU and powered by the WU via the connector, the method comprising:

• receiving, at one or more microphones of the headset, a first ambient noise, wherein the headset is without a processor and includes one or more speakers;
• receiving, at the one or more internal microphones, a second ambient noise;
• generating, by the one or more microphones of the headset, a first signal based on the first ambient noise;
• generating, by the one or more internal microphones, a second signal based on the second ambient noise;
• receiving, by the WU via the connector, the first signal;
• calculating, by the processor of the WU, an estimate of ambient noise based on the first signal and the second signal;
• further calculating, by the processor of the WU, a signal for noise cancellation based on the estimate of ambient noise, wherein the processor of the WU determines one or more phase shifts, and wherein the calculating the signal for noise cancellation is further based on the one or more phase shifts;
• canceling, by the processor of the WU, estimated ambient noise from an audio output signal based on an application of the signal for noise cancellation;
• and
• sending, by the processor of the WU, the audio output signal to the one or more speakers of the headset or the one or more internal speakers of the WU.