A method of active noise reduction, comprising: instructing a microphone electronically coupled by a client terminal or an adaptor device to record a nonaural noise signal; instructing a circuit of said client terminal or said adaptor device to record an aural noise signal using an electroacoustic transducer of at least one earphone, wherein said nonaural noise signal and said aural noise signal are recorded at least partly simultaneously; calculating a noise reduction signal based on a function combining said nonaural noise signal and said aural noise signal; calculating a noise reduced signal based on a combination of a content signal prepared to be played by the electroacoustic transducer and said noise reduction signal; characterized in that the method further comprises: instructing said circuit to play said noise reduced signal via the electroacoustic transducer, and wherein recording said aural noise signal comprises recording an aural noise signal that includes a plurality of fragments which are recorded intermittently, and wherein either a) or b), wherein a) said instructing said circuit comprises instructing said circuit to record said aural noise signal via the electroacoustic transducer in a plurality of recording iterations and intermittently playing said noise reduced signal in a plurality of playing iterations via the electroacoustic transducer so that said plurality of playing iterations are temporarily intertwined with said plurality of recording iterations; and b) each fragment of said plurality of fragments lasts less than 3 milliseconds, and said circuit instructs the electroacoustic transducer to play intermittently said noise reduced signal between each of two consecutive fragments of said plurality of fragments. instructing a microphone electronically coupled by a client terminal or an adaptor device to record a nonaural noise signal; instructing a circuit of said client terminal or said adaptor device to record an aural noise signal using an electroacoustic transducer of at least one earphone, wherein said nonaural noise signal and said aural noise signal are recorded at least partly simultaneously; calculating a noise reduction signal based on a function combining said nonaural noise signal and said aural noise signal; calculating a noise reduced signal based on a combination of a content signal prepared to be played by the electroacoustic transducer and said noise reduction signal; instructing said circuit to play said noise reduced signal via the electroacoustic transducer, and wherein recording said aural noise signal comprises recording an aural noise signal that includes a plurality of fragments which are recorded intermittently, and wherein either a) or b), wherein a) said instructing said circuit comprises instructing said circuit to record said aural noise signal via the electroacoustic transducer in a plurality of recording iterations and intermittently playing said noise reduced signal in a plurality of playing iterations via the electroacoustic transducer so that said plurality of playing iterations are temporarily intertwined with said plurality of recording iterations; and b) each fragment of said plurality of fragments lasts less than 3 milliseconds, and a) said instructing said circuit comprises instructing said circuit to record said aural noise signal via the electroacoustic transducer in a plurality of recording iterations and intermittently playing said noise reduced signal in a plurality of playing iterations via the electroacoustic transducer so that said plurality of playing iterations are temporarily intertwined with said plurality of recording iterations; and b) each fragment of said plurality of fragments lasts less than 3 milliseconds, and said circuit instructs the electroacoustic transducer to play intermittently said noise reduced signal between each of two consecutive fragments of said plurality of fragments.