1. A method for using a hearing aid device by a hearing aid user, comprising: a processor in the hearing aid generating a first signal representing sound received by the hearing aid device; the processor processing the first signal to provide a noise reduced signal representative of speech and a noise signal; the processor processing the noise signal to determine at least a first and a second noise feature; the processor processing the noise reduced signal to determine a speech feature; the processor estimating a classification threshold based on the at least first and second noise feature; and the processor processing information from a database of the hearing aid user's speech, the speech feature and the classification threshold to determine whether the noise reduced signal represents the hearing aid user's own voice.