Lakshmi Krishnan, (M Tech in Computational Engineering and Networking from CEN (2010-2012), PhD in Engineering from Victoria University of Wellington, New Zealand)
Current Designation:
Postdoctoral Research Fellow, Victoria University of Wellington, New Zealand
I am an alumni of CEN; I completed my M Tech in Computational Engineering
in 2012. My time at Amrita was a very different experience, especially the
guidance of our beloved Soman Sir, which nurtured my interest into research
in the fields of signal processing and optimization. After completing my
Masters, I moved to New Zealand where I started exploring opportunities for
pursuing my research interests. My PhD thesis supervisor at Victoria,
impressed by the research that I carried out under the guidance of Soman
Sir, agreed to supervise me for Doctoral research. I was also fortunate to
get my research funded using the coveted Victoria Doctoral Scholarship. The
scholarship is highly competitive and awarded mainly based on academic
credentials and the quality of publications. I could get this scholarship
primarily because of the publications from the research work done with
Soman Sir.
Coming to my doctoral research, my thesis was on acoustic impulse response
shaping, which is a technique to reduce the effect of reverberation on
sound signals propagating inside a room. This done by employing shaping
filters, which selectively equalize the room impulse response to achieve a
desired response at a particular listener position inside the room. The
technique has applications in listening field compensation and 3D audio. My
research was aimed at developing novel solutions for solving two main
issues with implementing the shaping approach in real time: computational
efficiency of the filter estimation and robustness of the filters to
variations in the room response. This was a challenging problem and
required the extensive use of convex optimization techniques to develop
such an algorithm. The insight into optimization techniques given by Soman
Sir helped me a lot in developing such an algorithm successfully. In
addition, I found his way of visualizing a problem in an n-dimensional
space very useful, especially while developing mathematical models and
formulations.
From my experience, CEN is the best place for any student who is looking
forward to become a researcher, especially if you have some interest in
mathematics. The course structure is organized in such a way that you
develop skills to visualize the problem at hand mathematically and use the
immense wealth of cutting edge technologies and techniques, that you learn
during the courses, to solve them. My experience is that every fine detail
that I was taught at CEN has been useful to me at some point or the other
in my research undertakings.
I believe myself to be privileged to say that I am a student of the great
teacher, Soman Sir and an alumni of CEN. I wish the very best to every new
student joining CEN for a wonderful career in research!