The application relates to hearing assistance device adapted for being arranged at least partly on a user's head or at least partly implanted in a user's head, the hearing assistance device comprising A) an input transducer system comprising A1) an audio input transducer for picking up a sound signal from the environment and providing an electric audio input signal, A2) a first and second supplementary input transducer for picking up a sound signal from the environment and providing a first and second supplementary electric input signal, B) an output transducer for converting a processed output signal to a stimulus perceivable by said user as sound, C) a time to time-frequency conversion unit allowing a signal to be processed or analyzed at different frequencies, such as in a number of frequency bands； D) one or more detectors of the acoustic environment of the hearing assistance device, and E) a signal processing unit operationally connected to said audio input transducer, to said first and second supplementary input transducer, and to said output transducer, said signal processing unit being configured for processing said electric audio input signal, and said first and second supplementary electric input signals, and for providing said processed output signal, and wherein a) said audio input transducer is adapted for being located in an ear of said user, and wherein b) the signal processing unit is configured to provide that said processed output signal is a mixture according to a predefined scheme of said electric audio input signal said first and second supplementary electric input signals on a time frequency unit basis, and wherein the actual mixture is influenced by said detectors. The invention may e.g. be used in hearing aids, headsets, ear phones, active ear protection systems, and combinations thereof.
