1. Fraunhofer Institute for Digital Media Technology (IDMT), Project group Hearing Speech and Audio Technology (HSA), 26129 Oldenburg, Germany
2. Fraunhofer Institute for Integrated Circuits (IIS), 91058 Erlangen, Germany
3. University of Lübeck, Institute for Signal Processing, 23538, Germany
4. University of Bremen, Dept. of Communications Engineering, 28334, Germany