US Patent 11057695 In-ear headphone device with active noise control

The present disclosure provides an in-ear headphone device including a loudspeaker having a loudspeaker diaphragm and a microphone, wherein the device is arranged to provide a noise cancelling audio signal to the loudspeaker. The loudspeaker and microphone are acoustically coupled within a device housing, and the device includes an acoustic tube coupling the device to an ear canal of a user. The acoustic tube is associated with an acoustic tube axis defining a projection plane perpendicular to the acoustic tube axis. The loudspeaker and microphone are arranged such that a projection area of the loudspeaker diaphragm onto the projection plane and a projection area of the microphone onto the projection plane are non-intersecting. The disclosure further provides an in-ear headphone device set including a first and a second in-ear headphone device.