Kaliappan Gopalan

Professor of Electrical Engineering

Address

Purdue University Calumet
Department of Engineering
Potter 229
2200 169th Street Hammond, IN 46323-2094

Phone: 219-989-2685

To send email: gopalan@calumet.purdue.edu

Education

 Ph.D. (Engineering), 1983
The University of Akron, Akron, Ohio.
Dissertation Title: Fourier-Bessel Expansion: Numerical Evaluation and Application in Representation and Feature Extraction of Speech Signals.
 
M.Tech. (EE), 1974
Indian Institute of Technology, Kanpur, India.
Thesis Title: A Pulse-Echo type Cable Fault Locator.
 
B.E. (EE), 1971
P.S.G. College of Technology (Univ. of Madras), Coimbatore, India.

Experience

Aug. 1985 to present - Professor of Electrical Engineering, Department of Engineering, Purdue University Calumet, Hammond, IN.
Summer 2005 – ASEE Summer Faculty Fellowship Program participant, Rome Laboratory, Air Force Research Laboratory, Rome, NY.
Summer 2002 – Visiting Faculty Research Program participant, Rome Laboratory, Air Force Research Laboratory, Rome, NY.  
Summer 2001 – Consultant to Corporate Research and Development, General Electric Company, Niskayuna, NY.
Summer 2000 – Visiting Faculty Research Program participant, Rome Laboratory, Air Force Research Laboratory, Rome, NY.  
Summer 1998 - Summer Faculty Research Associate, Air Force Research Laboratory, Rome Research Site, Rome, NY.
Summer 1996 - Summer Faculty Research Associate, Rome Laboratory, Griffiss Air Force Base, Rome, NY.  
Sep. 1987 to Dec. 1995 - Special Term Appointee, Argonne National Laboratory, Argonne, IL.   
Summer 1993 - Summer Faculty Research Associate, Armstrong Laboratory, Wright-Patterson Air Force Base, Dayton, OH.   
Summer 1987 - Faculty Research Participant, Argonne National Laboratory, Argonne, IL.   
Sep. 1983 to Aug. 1985 - Assistant Professor, Department of Electrical Engineering, Lafayette College, Easton, PA.
1979 to 1983 - Lecturer, Teaching Assistant and Research Assistant, Electrical Engineering Department, University of Akron, Akron, OH.  
1975 to 1979 - Research Engineer, Equipment Development Cell, Indian Institute of Technology, Kanpur, India.  
1974 to 1975 - Assistant Engineer (Instrumentation), Central Instrumentation Services, Indian Institute of Technology, Kanpur, India.

Areas of Instruction

  Signal Processing
  Speech Processing
  Communication
  Electronics
  Digital Systems

Research Interests

  Speech Signal Analysis
  Digital Signal Processing
  Digital Systems

Sponsored Research

2008 - 2010: Keyword Spotting, Air Force Research Laboratory, Rome, NY; $ 167,401

2006 Summer: Summer Faculty Research Extension Grant for cepstral domain analysis of speech to detect deception, Air Force Research Laboratory Rome, NY; $ 10,000

2003-2004: Cepstral domain data embedding in audio signals, Air Force Research Laboratory, Rome, NY; $ 80,000

1999: Modulation characteristics of speech under varying heart rates of speakers, Air Force Office of Scientific Research; $ 25,000

1997: Analysis of the acoustic correlates of speech under stressed conditions, Air Force Office of Scientific Research; $ 25,000

Patents

U.S. patent No. 7,231,271 for, “Steganographic method for covert audio communications” – June 12, 2007.

 U.S. patent No. 7,035,700 for, “Method and apparatus for embedding data in audio signals” – April 25, 2006.

 U.S. patent No. 7,555,432 for, "Audio steganography method and apparatus using cepstrum modification" - June 30, 2009.

Textbooks

Introduction to Signal and System Analysis, October 2008 (© 2009), by Cengage Learning
 
Introduction to Digital Microelectronic Circuits, January 1996, by Richard D. Irwin (now McGraw-Hill), Chicago, IL. Paperback edition published in 2002 by McGraw-Hill

Representative Publications

K. Gopalan and Q. Shi, “Audio Steganography using Bit Modification--A Tradeoff on Perceptibility and Data Robustness for Large Payload Audio Embedding," 2010 Proc. of the 19th International Conference on Computer Communications and Networks, August 2-5, 2010, Zurich, Switzerland.

K. Gopalan and T. Chu, “Speech Recognition for Keyword Spotting using a Set of Modulation Based Features - Preliminary Results,” Proc. of the 8th International Conference on Computing, Communications and Control Technologies (CCCT 2010), Orlando, FL, April 2010.

K. Gopalan, Tao Chu, and Xiaofeng Miao, "An Utterance Recognition Technique for Keyword Spotting by Fusion of Bark Energy and MFCC Features," Proc. of the 9th WSEAS International Conference on Signal, Speech & Image Processing (SSIP'09), Budapest, Hungary, September 2009.

K. Gopalan, “An Image Steganography Implementation for JPEG-Compressed Image,” Proc. of the IEEE 7th International Symposium on Communications and Information Technologies (ISCIT2007), Sydney, Australia, October, 2007.

K. Gopalan and S. Wenndt, “Speech Analysis using Modulation-based Features for Detecting Deception,” Proc. of the IEEE 15th International Conference on Digital Signal Processing (DSP 2007), Cardiff, Wales, July 2007.

K. Gopalan, “A One-Dimensional Technique for Embedding Data in a JPEG Color Image,” Proc. of the 2006 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS2006), Singapore, December 2006.

K. Gopalan, “A Technique for Imperceptible Embedding of Data in a Color Image,” Proc. of the IEEE International Conference on Informatics in Control, Automation and Robotics (ICINCO 2006), Setúbal, Portugal, August 2006.

K. Gopalan, “A Data Hiding Technique for JPEG Color Images By One-Dimensional Spectrum Modification,” Proc. of the IEEE International Symposium on Industrial Electronics (ISIE 2006), Montreal, Canada, July 2006.

K. Gopalan, “Robust Watermarking of Music Signals by Cepstrum Modification,” Proc. of the IEEE 2005 International Symposium on Circuits and Systems (ISCAS2005), Kobe, Japan, May 2005.

K. Gopalan “Audio Steganography by Cepstrum Modification,” Proc. of the IEEE 2005 International Conference on Acoustics, Speech, and Signal Processing (ICASSP’05), Philadelphia, March 2005.

 K. Gopalan and S. Wenndt, “Audio Steganography for Covert Data Transmission by Imperceptible Tone Insertion,” Proc. the IASTED International Conference on Communication Systems and Applications (CSA 2004), Banff, Canada, July, 2004.

K. Gopalan, “Cepstral Domain Modification of Audio Signals for Data Embedding – Preliminary Results,” Proc. of the Security and Watermarking of Multimedia Contents V Conference at IS&T/SPIE Electronic Imaging 2004, Santa Clara, CA, Jan. 2004.

K. Gopalan, “Audio Steganography Using Bit Modification,” Proc. of the IEEE 2003 International Conference on Multimedia and Exposition (ICME 2003), July 2003; also, Proc. of the IEEE 2003 International Conference on Acoustics, Speech, and Signal Processing (ICASSP’03), Hong Kong, Apr., 2003.

K. Gopalan, S. Wenndt, S. Adams and D. Haddad, “Covert Speech Communication Via Cover Speech By Tone Insertion,” Proc. of the IEEE Aerospace Conference, Big Sky, MT, Mar. 2003.

K. Gopalan, “Speech Coding using Fourier-Bessel Expansion of Speech Signals,” IEEE Industrial Electronics Conference (IECON’01), Denver, CO, Nov.-Dec. 2001.

K. Gopalan, “On the Effect of Stress on Certain Modulation Parameters of Speech,” Proc. of  the 26th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2001), Salt Lake City, UT, May 2001.

K. Gopalan, D.S. Benincasa, and S.J. Wenndt, “Data Embedding in Audio Signals,” Proc. of the 2001 IEEE Aerospace Conference, Big Sky, MT, Mar. 2001.

K. Gopalan, “Pitch Estimation Using a Modulation Model of Speech,” Proc. of the International Conference on Signal Processing (ICSP 2000), World Computer Congress, Beijing, China, Aug. 2000.

K. Gopalan, S. Wenndt, and E.J. Cupples, “An Analysis of Speech Under Stress using Modulation Characteristics,” Proc. of the 25th Annual Conference of the IEEE Industrial Electronics Society, San Jose, CA, Nov. 1999.

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