1. International Audio Laboratories Erlangen (A joint institution of the Friedrich-Alexander-University Erlangen-Nürnberg (FAU) and Fraunhofer Institute for Integrated Circuits IIS), Erlangen, Germany
2. Dipartimento di Elettronica Informazione e Bioingegneria, Politecnico di Milano, Milan, Italy
3. Fraunhofer Institute for Integrated Circuits IIS, Erlangen, Germany