My Professional Life

[Professional Objective] [Resume] [Experience and Employment History] [Selected Publications] [Patents] [Computer Skills]


Professional Objective

Continue research and development in statistical digital signal processing, with concentrations in adaptive, image, and sensor array signal processing.

[Top of Page (Table of Contents)]


Resume

Download resume in PDF format.

(You can visit the Adobe web site to obtain the Free Adobe Acrobat Reader to view and print such documents.)

[Top of Page (Table of Contents)]


Experience and Employment History

1998 (current)

"Image Data Compression Using Multiple Bases Representation." This unfunded research (my proposed Ph.D. dissertation topic) is targeted at further developing a method of signal coding and compression using multiple bases representation. The technique utilizes advantages of transform coding, vector quantization, and predictive coding, while aiming to circumvent the associated disadvantages of each. Preliminary results indicate that this hybrid approach can perhaps outperform conventional compression methods, and yield high compression ratios while avoiding prohibitive computational complexity.

1998 (current)

Independent consulting work as DSP Consultants (Dr. A. A. (Louis) Beex and John F. Tilki). Clients have included:

1998 (current)

Virginia Tech - Research Associate under Dr. A. A. (Louis) Beex, funded by CrossMedia Corporation through the Center for Wireless Telecommunications. We are investigating the effects of environment noise and cellular phone channel degradation on speech recognition performance in an automated email retrieval system. A software package for modeling and simulation is being produced as a contract deliverable.

1998

Virginia Tech - Senior Graduate Research Assistant under Dr. A. A. (Louis) Beex, funded by Digital System Resources, Inc (DSR). We developed a simulation software package that performs various signal-processing functions on low-frequency underwater acoustical signals. DSR plans to use the software in proof-of-concept demonstrations when pursuing additional related research grants.

1995 - 1997

Virginia Tech - Senior Graduate Research Assistant under Dr. A. A. (Louis) Beex, funded by Interactive Return Services, Inc., Grupo PISA , and the Center for Wireless Telecommunications. The Interactive Video Data System (IVDS) project involved encoding a hidden digital signature onto the analog audio component of a television signal. The hidden code is relatively imperceptible to human observers yet easily detectable by an inexpensive, DSP-based, interactive television device, which was designed, built, and programmed. The encoding scheme is also robust to extraneous room noise and the wow and flutter of videotape machines.

1995

Virginia Tech - Graduate Research Assistant under Dr. A. A. (Louis) Beex, funded by SYSCON Corporation. The project objective was target location estimation by matched field processing and source spectral estimation for shallow water acoustic array signals.

1993 - 1994

Virginia Tech - Graduate Research Assistant under Dr. A. A. (Louis) Beex, funded by IBM Federal Systems Division and Virginia's Center for Innovative Technology. The research focus was parametric spectral modeling and reconstruction of periodic acoustic signals buried in wideband colored noise, for the purpose of sensor array signal enhancement.

1990 - 1993

Virginia Tech - Teaching Assistant for the following courses:

Instructor for the following courses:

[Information about Electrical Engineering courses at Virginia Tech]

1989 - 1990

Worcester Polytechnic Institute - Senior Tutor for:

Teaching Assistant for:

Summer 1990

Northeast Utilities, Waterbury, CT - generated and evaluated computer models of power distribution systems in western Connecticut.

Summer 1989

WPI - Harit Majmudar Research Fellowship, Electrical Engineering - investigated current harmonics and arcing characteristics during high voltage, high impedance ground faults.

Summer 1988

Sikorsky Aircraft Company, Stratford, CT - Associate Electrical Engineer, Army Special Operations Aircraft Program, Systems Analysis and Integration Team.

[Top of Page (Table of Contents)]


Selected Publications

Several of the documents below are available for download in Adobe PDF format.
(You can visit the Adobe web site to obtain the Free Adobe Acrobat Reader to view and print such documents.)

MASTERíS THESIS

John F. Tilki, Encoding a Hidden Digital Signature Using Psychoacoustic Masking, Masterís Thesis, Virginia Polytechnic Institute and State University, Blacksburg, VA, 1998.

CONFERENCE PUBLICATIONS

Acoustic Source Spectral Estimation for a Shallow Water Channel, 23rd International Symposium on Acoustical Imaging (23ACOIMA), pp. 471-476, Boston, MA, April 13-16, 1997. (A. A. Beex and John F. Tilki)

Encoding a Hidden Auxiliary Channel onto a Digital Audio Signal Using Psychoacoustic Masking, IEEE Southeastcon 97, pp. 331-333, Blacksburg, VA, April 12-14, 1997. (John F. Tilki and A. A. Beex)

Encoding a Hidden Digital Signature onto an Audio Signal Using Psychoacoustic Masking, 7th Annual International Conference on Signal Processing Applications & Technology (ICSPAT96), pp. 476-480, Boston, MA, October 8-10, 1996. (John F. Tilki and A. A. Beex)

Image Data Compression Using Multiple Bases Representation, 26th IEEE Southeastern Symposium on System Theory (SSST'94), pp. 457-461, Athens, OH, March 20-22, 1994. (John F. Tilki and A. A. Beex)

Parametric Modeling and Reconstruction of Acoustic Signals, 26th IEEE Southeastern Symposium on System Theory (SSST'94), pp. 208-212, Athens, OH, March 20-22, 1994. (John F. Tilki and A. A. Beex)

PROJECT REPORTS

Under-Sampled Harmonic Signals and Power Estimation, Final Report for Measurement Division of American Electric Power, Roanoke, VA, May 26, 1998. (DSP Consultants: A. A. Beex and John F. Tilki)

Spectral Estimation for Shallow Water Acoustic Array Processing, Final Report for SYSCON Corporation, Middletown, RI, October 27, 1995. (A. A. Beex and John F. Tilki)

Signal Enhancement for Auditory Operator Input, Final Report for IBM Federal Systems Division, Manassas, VA, and the Center for Innovative Technology, Herndon, VA, September 9, 1994. (A. A. Beex, John F. Tilki, and Gaguk Zakaria)

[Top of Page (Table of Contents)]


Patents

Encoding a Hidden Digital Signature onto an Audio Signal Using Psychoacoustic Masking, Virginia Tech Intellectual Properties, Inc., Disclosure #96-079, October 14, 1996

Adding a Hidden Auxiliary Channel onto a Digital Audio Signal Using Psychoacoustic Masking, Virginia Tech Intellectual Properties, Inc., Disclosure #97-010, February 2, 1997

[Top of Page (Table of Contents)]


Computer Skills

[Top of Page (Table of Contents)]


[Home]


Author: John F. Tilki (tilki@vt.edu)
URL: http://www.ee.vt.edu/~jntilki
Date of last revision: November 28, 1998