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EDUCATION

CAREER SUMMARY

WORK EXPERIENCE                           

WORK EXPERIENCE

·         Phone and Media Processing (Voice over IP Group, Telogy Networks)

Software Development and Integration

o        Designed and implemented state-of-the-art Acoustic Echo Cancellation (AEC) software – Echo Canceller (full duplex solution) and Echo Suppressor (half duplex solution)

o        Lead engineer for finite state machine modeling of AEC for design enhancements and for introduction of new features such as noise guard and high level compensation

o         Technical lead for integration of AEC and AGC for all software releases

o        Developed an Automatic Gain Control (AGC) unit to adaptively monitor and control DSP system gains

o        Principal architect for design and development of a bidirectional signal equalizer for IP Phone (IPP) and Wireless LAN IPP (WIPP) applications

o        Designed and implemented a comprehensive band-splitting approach for wideband AEC operation

o        Lead engineer for AEC and AGC related special engineering releases to customers

Testing, Calibration and Training

o        Coordinated complete unit testing, black-box testing and white-box testing of AEC and AGC

o        Trained test engineers in calibration of AEC and AGC software, and testing for compliance with benchmark industry standards like G.167

o        Contributed new test tools for AEC convergence analysis and echo path estimation; developed a complete set up for narrow-band and wide-band testing of IPP enclosures and software

o        Responsible for comprehensive evaluation of noise characteristics of the analog codec on TI’s Titan chip

o        Principal engineer for customer training and workshops on AEC/AGC for Voice over IP applications

o        Team member for qualitative and quantitative evaluation of transducers and enclosure designs for TI’s IPP

·         Image Processing (UMD, IITD)

o        Proposed and developed an automated industry solution for robust pattern recognition and classification of semiconductor defects (using classifiers such as discriminant analysis and support vector machines)

o        Designed and implemented a novel smart-beam-search algorithm for feature selection in pattern classification

o        Proposed and implemented an innovative scheme for automated segmentation and script identification of electronic document images

o        Developed a novel content-based retrieval engine for electronic document images

o        Implemented and evaluated various algorithms for face-recognition, digital watermarking, texture-segmentation and geometric correction of images

·         Speech and Video Processing (HRL, UMD)

o        Formulated, designed and developed an intelligent video surveillance system for intruder detection under non-stationary ambient conditions

o        Formulated, implemented and evaluated a speaker-independent digit recognition system

o        Conducted in-depth analysis of different algorithms for speech recognition in noisy telephony environments; made recommendations for enhancing algorithm performance

o        Analyzed and evaluated different feature extraction schemes as front-ends to Hidden Markov Modeling based speech recognition systems

o        Implemented and evaluated algorithms for estimation of structure from motion and video mosaicing

·         Communication Theory/Systems (UMD, IITD)

o        Implementation and validation of the Viterbi decoder and trellis-coded modulation encoder/decoder

o        Circuit realization for direct sequence spread spectrum modulation and demodulation

o        Development, fabrication and evaluation of a novel design for fiber array blocks used in optical networks

SKILLS SET

HONORS AND AWARDS

·         Best Undergraduate Research Project, Electrical Engineering Department, IITD (1999 - 2000)

·         Students’ Undergraduate Research Award, Electrical Engineering Department, IITD (1998 - 1999)

·         Jawahar Lal Nehru Memorial Scholarship for academic excellence at IITD  (1999 – 2000)

·         Merit Scholarship from Ramanujan Society of Born Mathematicians (1996 - 1997)

·         Merit Scholarships for outstanding performance in Junior Science Talent Search (1993 - 1995)

·         Mathematics Wizard Award for excellence in Mathematics Talent Search (1990 - 1992)

PUBLICATIONS AND PATENTS

·         “Smart Beam Search for Effective Feature Selection in SVM Automatic Defect Classification,” International Conference on Pattern Recognition, 2002, Quebec City, Canada

·         “A Model Guided Document Image Analysis Scheme,” International Conference on Document Analysis and Recognition, 2001, Seattle, USA

·         “Wavelet based page segmentation,” Proceedings of International Conference on Vision, Graphics and Image Processing (ICVGIP), 2000, Bangalore, India. Awarded Best Technical Paper Award.

·         “Preparation and Evaluation of Optical Fiber Array Blocks,” Photonics, 1998, Delhi, India

·         Patent for “Design and Fabrication Methodology for Optical Fiber Array Blocks”, 1998

RELEVANT COURSES

Graduate Courses

• Information Theory: Information measure, entropy, mutual information; source encoding; noiseless coding theorem, noisy coding theorem; exponential error bounds; introduction to probabilistic error correcting codes, block and convolutional codes and error bounds; channels with memory; continuous channels; rate distortion function.

• Advanced Digital Signal Processing: Review of digital filter design, quantization effects, and random sequences; multirate signal processing: decimation and interpolation, multi-stage implementation, perfect reconstruction and quadrature mirror filter banks; parametric modeling and linear prediction theory; spectral estimation: periodogram, parametric model and model-based spectral estimation, maximum entropy method, higher-order spectral analysis; multi-dimensional signal processing.

• Digital Speech Processing (Advanced Topics in Signal Processing): Speech Production and Acoustic Phonetics, Articulatory Phonetics, Accoustic Theory of Speech Production,Vocal tract Modeling, Discrete-time Modeling of Speech Production, Auditory Processing and Speech Perception, Short-time Fourier Transform , Linear Prediction Analysis of Speech , Cepstral Analysis of Speech , Speech Coding  Speech Synthesis , Speech Analysis Tools: Pitch Detection, Formant Tracking, Speech Recognition, Hidden Markov Modeling Approach to Speech Recognition, Knowledge-based Approach to Speech Recognition

•  Estimation and Detection Theory: Estimation of unknown parameters, Cramer-Rao lower bound; optimum (map) demodulation; filtering, amplitude and angle modulation, comparison with conventional systems; statistical decision theory Bayes, minimax, Neyman/Pearson, Criteria-68 simple and composite hypotheses; application to coherent and incoherent signal detection; M-ary hypotheses; application to uncoded and coded digital communication systems.

• Image Understanding (Advanced Topics in Signal Processing): Edge Detection; Shape Detection; Texture segmentation using filtering methods, Markov random fields and normalized cuts, Structure from motion(2 frame, multiframe based methods), optical flow; shape from shading; stereo vision and stereo correspondance; object recognition; color indexing; face recognition; condensation and sequential importance sampling

• Error Correcting Codes: Introduction to linear codes; bounds on the error correction capabilities of codes; convolutional codes with threshold, sequential and viterbi decoding; cyclic random error correcting codes; P-N sequences; cyclic and convolutional burst error correcting codes.

• Fundamentals of Computer Vision: Image creation, radiometry, photometry; pinhole camera, camera models and camera caliberation; Linear Algebra of matrices for computer vision applications; projective geometry; interpolation splines; local features and grouping; pose and rigid body motion; pattern recognition and learning; object recognition; stereo vision; motion and flow; shape from shading; Tracking: motion models, tracking humans from video; sampling methods; Epipolar geometry; 3D reconstruction from multiple views; introduction to MPEG

• Random Processes in Communication Systems: Introduction to random processes: characterization, classification, representation; Gaussian and other examples. Linear operations on random processes, stationary processes: covariance function and spectral density. Linear least square waveform estimating Wiener-Kolmogroff filtering, Kalman-Bucy recursive filtering: function space characterization, non-linear operations on random processes.

Undergraduate Courses

• Probability and Statistics: Axioms of probability; conditional probability and Bayes' rules; random variables, probability distribution and densities: functions of random variables: weak law of large numbers and central limit theorem. Introduction to random processes; correlation functions, spectral densities, and linear systems. Applications to noise in electrical systems, filtering of signals from noise, estimation, and digital communications

• Data Structures: Description, properties, and storage allocation of data structures including lists and trees.Algorithms for manipulating structures. Applications from areas such as data processing, information retrieval, symbol manipulation, and operating systems.

• Digital Image Processing: Fundamental topics in Image Processing. Topics include 2-D systems and transforms, image acquisition, sampling and quantization, linear and non-linear techniques for image enhancement, restoration and image compression, including transform, differential pulse code modulation, vector quantization, wavelet, subband coding, still and video compression coding standards.

• Digital Signal Processing: Sampling as a modulation process; aliasing; the sampling theorem; the Z-transform and discrete-time system analysis; direct and computer-aided design of recursive and non recursive digital filters; the Discrete Fourier Transform (DFT) and Fast Fourier Transform (FFT); digital filtering using the FFT; analog-to-digital and digital-to analog conversion; effects of quantization and finite-word-length arithmetic

• Multimedia Systems and Standards: Introduction to various standards. JPEG, MPEG1, MPEG2, MPEG4 and MPEG7. MHEG standard. Stream Management related issues and system requirements; face recognition and manipulation of face models; Digital watermarking and other Intellectual Propert rights related issues in distribution and transmission of multimedia content, virtual environments; video mosaics; Principal component analysis

• Operating Systems: Description of the parts of an operating system in terms of function, structure, and implementation. Basic resource allocation policies. File system, memory management, process management. Selected Topics in Digital Communications Introduction to major issues in digital communication; entropy and information measures; frequency hopping and spread spectrum modulation; PN sequences; secure communication; basic error correction; channel coding and soure coding fundamentals.

• Computer Networks: The OSI model including discussion and examples of various network layers. A general introduction to existing network protocols. Communication protocol specification, analysis, and testing.

• Information Systems Design and Database Management: Motivation for the database approach as a mechanism for modeling the real world. Review of the three popular data models: relational, network, and hierarchical. Comparison of permissible structures, integrity constraints, storage strategies, and query facilities. Theory of database design logic.

EXTRA CURRICULAR ACTIVITIES          

• Volunteer for publicity and fundraising activities of non-governmental organizations working for the welfare of under-privileged in India, 1999 – present

• Coordinator and supervisor for technical and cultural campus events at UMD and IITD, 1997 - 2002

• Executive coordinator of Social Maladies Committee of the National Service Scheme, India, 1997 - 1998

• Volunteer for adult and children literacy programs and other community welfare efforts, 1996 – 2000

HOBBIES

•  Painting, traveling, reading, listening to music, theater, badminton

REFERENCES

• Available upon request