Bachelor of Engineering (Electronics & Communications) degree (1995-1999) from University College of Engineering, Osmania University. PhD in Electrical Communication Engineering (1999-2005) from Indian Institute of Science, Bangalore, India. Consultant to M/s. ESQUBE Communication Solutions Pvt. Ltd. (2005-2006) Bangalore, India. Post doctoral fellow (April 2006-) in the Biomedical Imaging Laboratory. My Researcher ID is A-8693-2008.

Research interests:

• Optical coherence tomography and Holography

• Inverse Problems in optics

• Time-frequency analysis

• Speech and music signal processing, Psychoacoustics

• Bioacoustics (crickets, birds, elephants etc.) - Collaborator: Prof.Rohini, Center for Ecological Sciences, IISc

Recent publications (September 2006-):

• C.S. Seelamantula, M.L. Villiger, R.A. Leitgeb, M. Unser, "Exact and Efficient Signal Reconstruction in Frequency-Domain Optical-Coherence Tomography," Journal of the Optical Society of America A, vol. 25, no. 7, pp. 1762-1771, July 2008.

• R.A. Leitgeb, R. Michaely, T. Lasser, S. Chandra Sekhar, "Complex Ambiguity-Free Fourier Domain Optical Coherence Tomography through Transverse Scanning," The Virtual Journal for Biomedical Optics, vol. 3, no. 1, January 29, 2008.

• S.C. Sekhar, R. Michaely, R. Leitgeb and M. Unser, "Theoretical Analysis of Complex-Conjugate-Ambiguity Suppression in Frequency-Domain Optical-Coherence Tomography", Proceedings of the Fifth IEEE International Symposium on Biomedical Imaging: From Nano to Macro (ISBI'08), Paris, France, May 14-17, 2008, pp. 396-399.

• J.-C. Baritaux, S.C. Sekhar, M. Unser, "A Spline-Based Forward Model for Optical Diffuse Tomography," Proceedings of the Fifth IEEE International Symposium on Biomedical Imaging: From Nano to Macro (ISBI'08), Paris, France, May 14-17, 2008, pp. 384-387.

• S.C. Sekhar, M. Unser, "Performance Analysis of the Cepstral Technique for Frequency-Domain Optical-Coherence Tomography," Proceedings of the Thirty-Third IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP'08), Las Vegas NV, USA, March 30-April 4, 2008, pp. 557-560.

• R.A. Leitgeb, R. Michaely, T. Lasser, S.C. Sekhar, "Complex ambiguity-free Fourier domain optical coherence tomography through transverse scanning," Optics Letters, vol. 32, no. 23, pp. 3453-3455, December 2007.

• A. S. Murthy, S. C. Sekhar and T. V. Sreenivas, "Robust and high-resolution voiced/unvoiced classification in noisy speech using a signal smoothness criterion", Proc. INTERSPEECH 2007, Antwerp, Belgium, 2007.

• S. C. Sekhar, R. A. Leitgeb, A. H. Bachmann and M. Unser, "Logarithmic transformation technique for exact signal recovery in frequency-domain optical coherence tomography", Vol. 6627, Article No. 662714, Progress in Biomedical Optics and Imaging, Proc. SPIE European Conference on Biomedical Optics (ECBO) 2007, Munich, Germany.

• S. C. Sekhar, H. Nazkani, T. Blu and M. Unser, "A new technique for high-resolution frequency domain optical coherence tomography", Proc. IEEE Intl. Conference on Acoustics, Speech and Signal Processing (ICASSP) 2007.

• S. C. Sekhar, R. A. Leitgeb, M. L. Villiger, A. H. Bachmann, T. Blu and M. Unser, "Non-iterative exact signal recovery in frequency domain optical coherence tomography", Proc. IEEE Intl. Symposium on Biomedical Imaging (ISBI) 2007.

• T.G. Thomas and S. C. Sekhar, "Perception studies on the attributes of synthetic clear speech for the hard of hearing", Proc. Intl. Symposium on Signal Processing and its Applications (ISSPA), Sharjah, UAE, 2007.

• S. C. Sekhar, S. Pilli, C. Lakshmikanth and T. V. Sreenivas, "Novel auditory motivated subband temporal envelope based fundamental frequency estimation algorithm", Proc. 14th European Signal Processing Conference (EUSIPCO), September 4-8, 2006, Florence, Italy.

Demonstration files for papers under review are available here:

• "Block-Artifacts in Speech/Audio Revisited: Auditory-Model-Based Characterization and Optimal Time-Frequency Smoothing", Signal Processing (Elsevier) - : (zip file)

• "Multiband AM-FM Quantization by Employing Perceptual Criteria", IEEE Transactions on Audio, Speech and Language Processing - : (zip file)

The classic 1946 paper by Gabor is available here (Thanks to Balaji Thoshkahna and Prasanta Kumar Ghosh):

• D. Gabor,"Theory of Communication", Proc. IEE, pp. 429-457, 1946.

Contact details

Phone number: +41 (21) 693 51 35

Fax number: +41 (21) 693 37 01

Office room: BM 4.136

Email address: chandrasekhar.seelamantula[-.-.@.-.-]epfl.ch