Patent ID: 8682010

Claim:
A headphone system for a user, comprising: a headset with at least one ear unit, a loudspeaker for generating sound, an internal microphone located on the inside of the ear unit for generating an internal sound signal, and an external microphone located on the outside of the ear unit for generating an external sound signal; and at least one reverberation extraction unit connected to the microphones, arranged to extract an acoustic response of an environment of the headphone system from the internal sound signal and the external sound signal recorded as the user speaks, wherein an adaptive filter in the reverberation extraction unit is arranged to seek [n] so as to minimize e[n]=[n]*Mic e [n]−Mic i [n], where Mic e is the external sound signal recorded with the external microphone, Mic i [n] is the internal sound signal recorded with the internal microphone, [n] is a time index, and the minimization is carried out in a least square sense, where * denotes a convolution operation.