There is provided a speech classification apparatus 100 for hearing devices with electroencephalography, EEG, dependent sound processing, comprising a sound processing unit 10 configured to capturing sound input signals 11 from at least one external microphone 15 and segmenting said captured sound input signals into segmented sound signals 17, a speech classification unit 20 comprising a speech cepstrum calculation unit 21 configured to calculate a speech cepstrum 14 for each segmented sound signal 17, an EEG cepstrum calculation unit 40 configured to calculate an EEG cepstrum 13 for an EEG signal 12 of a user's brain 220, a mapping unit 22 configured to select a predetermined number of coefficients from each calculated sound cepstrum 14 and from the calculated EEG cepstrum 13, and a correlation unit 23 configured to calculate a correlation value for each captured sound input signal 11 based on a correlation of the predetermined number of selected coefficients 13, 14 from the respective calculated sound cepstrum with the predetermined number of selected coefficients from the calculated EEG cepstrum, wherein an attended speech source is classified based on the obtained correlation values.
SOUND PROCESSING APPARATUS