His research interests include statistical signal processing, audio source separation, array signal processing, machine learning, latent variable model, graph-based data structure, and computer architecture.
From 2006 to 2009, he served as an associate editor of the IEEE Transactions on Audio, Speech & Language Processing. He is an associate member of the Audio and Acoustic Signal Processing Technical Committee of the IEEE SP Society. He received the Best Paper Award of the IEEE Circuit and System Society in 2001, the SPIE ICA Unsupervised Learning Pioneer Award in 2013, and the IEEE Signal Processing Society 2014 Best Paper Award. He is an IEEE Fellow, an IEICE Fellow, and a member of the ASJ.