Research Interests Perceptual audio coder systems including OCF, ASPEC, MPEG-1/2 Audio Layer-3 (mp3) and MPEG-2 Advanced Audio Coding (AAC) Editor of MPEG-4 Audio and project leader for the development of the MPEG Unified Speech and Audio Codec (today known as xHE-AAC) Fraunhofer Cingo for virtual surround sound Fraunhofer Symphoria for automotive 3D audio AAC-ELD for telephone calls with CD-like audio quality Dialog Enhancement to allow TV viewers to adjust dialog loudness as they desire