Sean A. Ramprashad
Project Manager, Research
DoCoMo USA Labs


RESEARCH INTERESTS

BACKGROUND

PROFESSIONAL ACTIVITIES

PUBLICATIONS




Research Interests

  • Signal Compression:
    • Layered source coding, Wideband speech coding, Joint speech and audio coding, Video Coding.
  • Communications and Transport (802.11, Wireless MIMO, etc.)
    • QoS in 802.11, Unequal Error Protection, Wireless MIMO.
  • Signal Detection and Classification
    • Invariant Models and Detection Variable-length segmentation and classification in time-series, Marine mammals.

Background

I joined NTT DoCoMo in December 2004 and am presently a project manager for the Audio and Transport team within the Media Lab of DoCoMo Communications Labs, USA. Our team is focused on a variety of topics spanning acoustic signal processing, audio and speech coding, and the transport of multimedia.

I received a B.S.E. degree summa cum laude in Electrical Engineering from Princeton University in 1991, and M.S. and Ph.D. degrees in Electrical Engineering from Cornell University in 1993 and 1996, respectively. My professional career started as an intern with AT&T Bell Laboratories (Area 11) during the years 1993 to 1995. I then continued full-time as a Member of Technical Staff in core research at Lucent Technologies Bell Laboratories in 1996, moving to Agere Systems (a spin-off of Lucent and Bell Labs) as Distinguished Member of Technical Staff in 2000. In 2005 I left Agere and started at NTT DoCoMo.

My research interests have covered a range of areas including speech and audio coding, detection theory, video coding, network simulation, information theoretic aspects of vector quantization and feature extraction, and transport issues including wireless MIMO and QoS support in 802.11. I have also been involved in a variety of product teams focused on video-teleconferencing, satellite audio broadcasting (Sirius), Bluetooth audio, ITU-T coding standards and hardware architectures for mobile multimedia platforms.

Professional Activities

  • Senior Member, IEEE (Signal Processing Society)
  • Associate Editor, IEEE Trans. on Speech and Audio Processing 2000-2002
  • ITU-T SG-16 Delegate, NTT DoCoMo (past for Lucent Technologies)
  • Guest Editor, International Journal on Speech Technology
  • Technical Committee Member (2002), Publicity Chair (1997), IEEE Workshop on Speech Coding
  • Reviewer for numerous journals, conferences and workshops.

Teaching/Mentoring Activities

  • Supervisor, Post-Doctoral Fellow, Bell Labs 1999
  • Master in Engineering Project Mentor, Cornell University 1993
  • Teaching Assistant, Cornell University, 1992/1993
  • Volunteer Teaching Assistant, Alternate Community School, Ithaca, NY 1991

Publications

Journal Papers

  1. S. A. Ramprashad. "Sparse Bit-Allocations based on Partial Ordering Schemes with Application to Speech and Audio Coding", Accepted as a regular paper IEEE Transactions on Speech, Audio and Natural Language Processing, Feb 2006.
  2. S. A. Ramprashad. "The Multimode Transform Predictive Coding Paradigm", IEEE Transactions on Speech and Audio Processing, Volume 11, Issue 2, pp 117-129, March 2003.
  3. C. Faller, B-H. Juang, P. Kroon, H-L, Lou, S. A. Ramprashad, C.-E. W. Sundberg, "Technical advances in digital audio broadcasting", Proceedings of the IEEE, Vol. 90, Issue 8, pp. 1303-1333, August 2002.
  4. S. Ramprashad. "Embedded Coding Using a Mixed Speech and Audio Coding Paradigm", International Journal of Speech Technology, May 1999.
  5. S. Ramprashad, T. W. Parks. "Locally Most Powerful Invariant Tests for Signal Detection", IEEE Transactions on Information Theory, May 1998.
  6. S. Ramprashad, R. Shenoy, T. W. Parks. "Signal Modeling and Detection Using Cone Classes", IEEE Transactions on Signal Processing, February 1996.

Conference Papers

  1. S. A. Ramprashad, "Efficient Quantization of Statistically Normalized Vectors using Multi-Option Partial-Order Bit-Assignment Schemes", International Conference on Acoustics, Speech and Signal Processing, Toulouse, France, May 2006
  2. Christine Pepin, Ulas C. Kozat, Sean Ramprashad; "A Joint Traffic Shaping and Routing Approach to improve the performance of 802.11 Mesh Networks", IEEE 4th Intl. Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOPT), Boston, April 2006.
  3. S. A. Ramprashad. "Understanding the quality losses of embedded speech and audio coders", IEEE Speech Coding Workshop, Japan, October 2002.
  4. H. Taddei, S. A. Ramprashad, C-E. W. Sundberg and H-L. Lou, "Mode Adaptive Unequal Error Protection for Transform Predictive Speech and Audio Coders", International Conference on Acoustics, Speech and Signal Processing, Orlando, Florida, May 2002
  5. S. A. Ramprashad. "Stereophonic CELP Coding using Cross Channel Prediction", IEEE Speech Coding Workshop, Wisconsin, September 2000.
  6. S. A. Ramprashad. "High quality embedded wideband speech coding using an inherently layered coding paradigm", Int. Conf. on Acoustics, Speech and Signal Processing , Istanbul, Turkey, June 2000.
  7. S. A. Ramprashad. "A Multimode Transform Predictive Coder (MTPC) for Speech and Audio", IEEE Speech Coding Workshop, Helsinki, Finland, June 1999.
  8. S. A. Ramprashad. "A Two-Stage Hybrid Embedded Speech/Audio Coding Structure", International Conference on Acoustics, Speech and Signal Processing , Seattle, Washington May 1996.
  9. S. A. Ramprashad, T. W. Parks. "Application of Cone Detectors to Detection of Signals in Structured Interference", IEEE DSP Workshop, September 1996.
  10. S. A. Ramprashad, T. W. Parks. "Intersections of Cone Classes for Signal Modeling and Detection", International Conference on Acoustics, Speech and Signal Processing, Atlanta, GA., May 1996.
  11. S. A. Ramprashad, T .W. Parks. "General Cone Classes for Signal Modeling and Detection", In Proc. of 29th Annual Asilomar Conference on Signals, Systems, and Computers, Pacific Grove CA., October 1995.
  12. S. A. Ramprashad, T. W. Parks. "Application of Cone Classes and Locally Most Powerful Tests to Mismatch Compensation", In Proceedings of the 1994 International Conference on Information Systems and Sciences, Princeton University, Princeton NJ., March 1994.
  13. L. Wang, J. Belina, A. Vasinonta, M. Berner, S. Ramprashad. "Compression of ECG using Code Excited Linear Prediction (CELP)", In Proceedings of the 16th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, November 1993.
  14. P. Roca i Cabarrocas, S. Ramprashad, J. Z. Liu, V. Chu, A. Maruyama and S. Wagner, "Improving Tin Oxide/ Hydrogenated Amorphous Silicon Interfaces for Solar Cell Applications", Conference Record of the Twenty First IEEE Photovoltaic Specialists Conference, 1990, pp 1610 - 1613 vol.2




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