Patent ID: 8792975

Claim:
An electroencephalogram measurement apparatus comprising: an electroencephalogram measurement unit for measuring an electroencephalogram of a user by using a plurality of electrodes; an electro-acoustic transducer for presenting an acoustic signal to the user, the electro-acoustic transducer being in a vicinity of at least one electrode among the plurality of electrodes while the electroencephalogram measurement unit is worn by the user; an amplitude envelope extraction unit for extracting an amplitude envelope of the acoustic signal presented by the electro-acoustic transducer; a frequency analysis unit for analysing a frequency of the amplitude envelope extracted by the amplitude envelope extraction unit; and a noise estimation unit for estimating an electrical noise which originates from the electro-acoustic transducer and is mixed at the at least one electrode by using a previously provided set of transform rules and the frequency of the extracted amplitude envelope analyzed by the frequency analysis unit.