Research Interests

I work in four broad areas: Speech recognition, Audio processing, Neural networks and Privacy/Security for voice processing. In audio processing, I work on noise robustness, computational auditory scene analysis, microphone array processing and source separation. In speech recognition, I work on basic research issues that need to be addressed for better automatic speech recognition. In neural networks, I am interested in specialized architectures for signal processing, learning and information routing.

In addition to all of these topics, a major part of my research is focused on privacy preserving algorithms for speech and audio processing. Speech is possibly the most private form of communication; yet, when a speech processing engine such as a voice authentication system or a speech recognition service operates, it requires complete access to the voice recording. This has security, privacy and economic implications, such as snoopers or malicious systems who may use the data to derive undesired information (e.g. speaker demographics), create fake recordings or impersonate the user. Our team continues to develop various cryptographic and other techniques to deal with these problems.



The list of publications since 2009 can be accessed through the publications tab on top of this page.

Older publications can be accessed through my afs page

Paper awards:

  • Sourish Chaudhuri, Bhiksha Raj. "A Comparison of Latent Variable Models for Conversation Analysis", SIGDIAL 2011, best paper award.
  • Gahgene Gweon, Pulkit Agarwal, Mikesh Udani, Bhiksha Raj, Carolyn Rose'. "The automatic assessment of knowledge integration processes in project teams", 9th International Conference on Computer Supported Collaborative Learning CSCL 2011, best paper award.
  • Gautham Mysore, Paris Smaragdis, and Bhiksha Raj. "Non-negative Hidden-Markov modeling of audio with application to source separation." 9th international conference on latent variable analysis and source separation. St. Malo, France, 2010, best student paper.
  • M. L. Seltzer, B. Raj, R. M. Stern. "Likelihood-Maximizing Beamforming for Robust Hands-Free Speech Recognition", IEEE Trans. on Speech and Audio Processing, 12(5): 489-498, September 2004, IEEE Signal Processing Society best student paper award

Ph.D and masters' students


  • Benjamin Lambert (soon to graduate)
  • Jose Portelo
  • Nia Bradley
  • Anurag Kumar

Recently graduated

  • Manas Pathak
  • Sourish Choudhuri
  • Sohail Bahmani
  • Mahaveer Jain

Thesis award

  • Clifford Lyon. An interactive Java application for cluster analysis and data visualization.. Harvard University extension school, master's thesis. best Master's thesis in ALM for 2006


The list of projects can be accessed through the projects tab on top of this page.

Project funding information can be found in this page. Some other projects are funded through CISL grants and are not listed on this page.